@article {pmid28904365, year = {2017}, author = {Ma, X and Yao, L and Yang, B and Lee, YK and Chen, F and Liu, J}, title = {RNAi-mediated silencing of a pyruvate dehydrogenase kinase enhances triacylglycerol biosynthesis in the oleaginous marine alga Nannochloropsis salina.}, journal = {Scientific reports}, volume = {7}, number = {1}, pages = {11485}, pmid = {28904365}, issn = {2045-2322}, mesh = {Biomarkers ; Carbohydrate Metabolism ; Gene Expression Regulation ; Gene Knockdown Techniques ; *Gene Silencing ; Genotype ; Lipid Metabolism ; Microalgae/classification/*genetics/*metabolism ; Photosynthesis ; Phylogeny ; Protein Transport ; Protein-Serine-Threonine Kinases/chemistry/*genetics ; *RNA Interference ; Sequence Analysis, DNA ; Triglycerides/*biosynthesis ; }, abstract = {Oleaginous microalgae have been emerging as the third-generation feedstocks for biofuel production. Genetic manipulation for improving triacylglycerol (TAG) accumulation represents a promising approach towards the economics of microalgal biofuels. Acetyl-CoA, the essential carbon precursor for de novo fatty acid biosynthesis, can be derived from pyruvate catalyzed by pyruvate dehydrogenase, which is negatively regulated by pyruvate dehydrogenase kinase (PDK). In the present study, we characterized a PDK gene (NsPDK) from Nannochloropsis salina. Subcellular localization assay assisted by green fluorescence protein (GFP) fusion indicated the localization of NsPDK in mitochondria of N. salina cells. NsPDK knockdown via RNA interference strategy attenuated NsPDK expression at the mRNA level and its enzymatic activity in vivo, leading to faster TAG accumulation without compromising cell growth under high light stress conditions. Interestingly, the TAG increase was accompanied by a decline in membrane polar lipids. NsPDK knockdown also altered fatty acid profile in N. salina. Furthermore, transcriptional analysis suggested that the carbon metabolic pathways might be influenced by NsPDK knockdown leading to diverted carbon flux towards TAG synthesis. Taken together, our results demonstrate the role of NsPDK in regulating TAG accumulation and provide valuable insights into future manipulation of oleaginous microalgae for improving biofuel production.}, }
@article {pmid31218630, year = {2019}, author = {Gerlach, L and Gholami, O and Schürmann, N and Kleinschmidt, JH}, title = {Folding of β-Barrel Membrane Proteins into Lipid Membranes by Site-Directed Fluorescence Spectroscopy.}, journal = {Methods in molecular biology (Clifton, N.J.)}, volume = {2003}, number = {}, pages = {465-492}, doi = {10.1007/978-1-4939-9512-7_20}, pmid = {31218630}, issn = {1940-6029}, abstract = {Protein-lipid interactions are important for folding and membrane insertion of integral membrane proteins that are composed either of α-helical or of β-barrel structure in their transmembrane domains. While α-helical transmembrane proteins fold co-translationally while they are synthesized by a ribosome, β-barrel transmembrane proteins (β-TMPs) fold and insert posttranslationally-in bacteria after translocation across the cytoplasmic membrane, in cell organelles of eukaryotes after import across the outer membrane of the organelle. β-TMPs can be unfolded in aqueous solutions of chaotropic denaturants like urea and spontaneously refold upon denaturant dilution in the presence of preformed lipid bilayers. This facilitates studies on lipid interactions during folding into lipid bilayers. For several β-TMPs, the kinetics of folding has been reported as strongly dependent on protein-lipid interactions. The kinetics of adsorption/insertion and folding of β-TMPs can be monitored by fluorescence spectroscopy. These fluorescence methods are even more powerful when combined with site-directed mutagenesis for the preparation of mutants of a β-TMP that are site-specifically labeled with a fluorophore or a fluorophore and fluorescence quencher or fluorescence resonance energy acceptor. Single tryptophan or single cysteine mutants of the β-TMP allow for the investigation of local protein-lipid interactions, at specific regions within the protein. To examine the structure formation of β-TMPs in a lipid environment, fluorescence spectroscopy has been used for double mutants of β-TMPs that contain a fluorescent tryptophan and a spin-label, covalently attached to a cysteine as a fluorescence quencher. The sites of mutation are selected so that the tryptophan is in close proximity to the quencher at the cysteine only when the β-TMP is folded. In a folding experiment, the evolution of fluorescence quenching as a function of time at specific sites within the protein can provide important information on the folding mechanism of the β-TMP. Here, we report protocols to examine membrane protein folding for two β-TMPs in a lipid environment, the outer membrane protein A from Escherichia coli, OmpA, and the voltage-dependent anion-selective channel, human isoform 1, hVDAC1, from mitochondria.}, }
@article {pmid31218358, year = {2019}, author = {Krasovec, M and Sanchez-Brosseau, S and Piganeau, G}, title = {First estimation of the spontaneous mutation rate in Diatoms.}, journal = {Genome biology and evolution}, volume = {}, number = {}, pages = {}, doi = {10.1093/gbe/evz130}, pmid = {31218358}, issn = {1759-6653}, abstract = {Mutations are the origin of genetic diversity, and the mutation rate is a fundamental parameter to understand all aspects of molecular evolution. The combination of mutation-accumulation experiments and high throughput sequencing enabled the estimation of mutation rates in most model organisms, but several major eukaryotic lineages remain unexplored. Here, we report the first estimation of the spontaneous mutation rate in a model unicellular eukaryote from the Stramenopile kingdom, the diatom Phaeodactylum tricornutum (strain RCC2967). We sequenced 36 mutation accumulation lines for an average of 181 generations per line and identified 156 de novo mutations. The base substitution mutation rate per site per generation is μbs= 4.77x10-10 and the insertion-deletion mutation rate is μid= 1.58x10-11. The mutation rate varies as a function of the nucleotide context and is biased towards an excess of mutations from GC to AT, consistent with previous observations in other species. Interestingly, the mutation rates between the genomes of organelles and the nucleus differ, with a significantly higher mutation rate in the mitochondria. This confirms previous claims based on indirect estimations of the mutation rate in mitochondria of photosynthetic eukaryotes that acquired their plastid through a secondary endosymbiosis. This novel estimate enables us to infer the effective population size of P. tricornutum to be Ne∼8.72x106.}, }
@article {pmid31209489, year = {2019}, author = {Nieuwenhuis, M and van de Peppel, LJJ and Bakker, FT and Zwaan, BJ and Aanen, DK}, title = {Enrichment of G4DNA and a large inverted repeat coincide in the mitochondrial genomes of Termitomyces.}, journal = {Genome biology and evolution}, volume = {}, number = {}, pages = {}, doi = {10.1093/gbe/evz122}, pmid = {31209489}, issn = {1759-6653}, abstract = {Mitochondria retain their own genome, a hallmark of their bacterial ancestry. Mitochondrial genomes (mtDNA) are highly diverse in size, shape and structure, despite their conserved function across most eukaryotes. Exploring extreme cases of mtDNA architecture can yield important information on fundamental aspects of genome biology. We discovered that the mitochondrial genomes of a basidiomycete fungus (Termitomyces spp.) contain an inverted repeat (IR), a duplicated region half the size of the complete genome. In addition, we found an abundance of sequences capable of forming G-quadruplexes (G4DNA); structures that can disrupt the double helical formation of DNA. G4DNA is implicated in replication fork stalling, double-stranded breaks, altered gene expression, recombination, and other effects. To determine whether this occurrence of IR and G4DNA was correlated within the genus Termitomyces, we reconstructed the mitochondrial genomes of eleven additional species including representatives of several closely related genera. We show that the mtDNA of all sampled species of Termitomyces and its sister group, represented by the species Tephrocybe rancida and Blastosporella zonata, are characterised by a large inverted repeat and enrichment of G4DNA. To determine whether high mitochondrial G4DNA content is common in fungi, we conducted the first broad survey of G4DNA content in fungal mtDNA, revealing it to be a highly variable trait. The results of this study provide important direction for future research on the function and evolution of G4DNA and organellar IRs.}, }
@article {pmid31077734, year = {2019}, author = {Karagozlu, MZ and An, HE and Park, SH and Shin, SE and Kim, CB}, title = {Comparative analyses of the three complete mitochondrial genomes from forensic important beetle genus Dermestes with phylogenetic relationships.}, journal = {Gene}, volume = {706}, number = {}, pages = {146-153}, doi = {10.1016/j.gene.2019.05.020}, pmid = {31077734}, issn = {1879-0038}, mesh = {Animals ; Base Composition/genetics ; Base Sequence ; Coleoptera/*genetics ; Forensic Sciences/methods ; Gene Order/genetics ; Genome, Mitochondrial/*genetics ; Mitochondria/*genetics ; Phylogeny ; RNA, Ribosomal/genetics ; RNA, Transfer/genetics ; }, abstract = {Necrophagous Dermestes species have high forensic importance in relation to the estimation of elapsed time since death or death season. To further supplement the genome-level features for related species, the complete mitochondrial genome (mitogenome) of Dermestes species D. essellatocollis, D. frischii and D. coarctatus are amplified, sequenced, annotated, analyzed, and compared with other twelve species of the infraorder Bostrichoidea. The mitochondrial genomes were typical circular molecules with 16,218, 15,873 and 15,873 bp in length, respectively. They included 13 protein coding genes, two rRNAs, and 22 tRNAs, as well as the putative control region. The gene orders and orientations are identical to those of other recorded bostrichiformian species and had the ancestral insect gene composition. Furthermore, phylogenetic analyses based on all the mitochondrial protein coding genes for 13 Bostrichoidea and 16 outgroup taxa were performed using Bayesian and Maximum Likelihood analyses. The inferred trees indicate that the genus Dermestes is monophyletic. The monophyly of infraorder Bostrichiformia is not supported. This study provides genomic data for mitochondrial genome library of the genus Dermestes to investigate evolutionary and systematic studies.}, }
@article {pmid30776435, year = {2019}, author = {Dufresnes, C and Beddek, M and Skorinov, DV and Fumagalli, L and Perrin, N and Crochet, PA and Litvinchuk, SN}, title = {Diversification and speciation in tree frogs from the Maghreb (Hyla meridionalis sensu lato), with description of a new African endemic.}, journal = {Molecular phylogenetics and evolution}, volume = {134}, number = {}, pages = {291-299}, doi = {10.1016/j.ympev.2019.02.009}, pmid = {30776435}, issn = {1095-9513}, mesh = {Africa, Northern ; Animals ; Anura/*genetics ; Cell Nucleus/genetics ; DNA, Mitochondrial/genetics ; *Genetic Speciation ; *Genetic Variation ; Genetics, Population ; Mitochondria/genetics ; Phylogeny ; Phylogeography ; Principal Component Analysis ; }, abstract = {Comparative molecular studies emphasized a new biogeographic paradigm for the terrestrial fauna of North Africa, one of the last uncharted ecoregions of the Western Palearctic: two independent east-west divisions across the Maghreb. Through a comprehensive phylogeography, we assessed how this model suits the genetic diversification documented for the tree frog Hyla meridionalis sensu lato. Analyses of mtDNA variation and thousands of nuclear loci confirmed the old split (low-Pliocene) between Tunisian and Algerian populations. These lineages meet but barely admix in the eastern Maghreb (Algerian-Tunisian border), a sign of putatively advanced reproductive isolation. In the western Maghreb, we report a Pleistocene divergence between Moroccan and Algerian populations. Tree frogs thus follow both predictions: a double east-west break that gave rise to two suture zones characteristic of North-African phylogeography. Moreover, some intraspecific mtDNA variation is not mirrored by the nuclear data, emphasizing that evolutionary units should always be designated by multilocus approaches. Last but not least, we describe the Tunisian lineage as a new species endemic to Africa.}, }
@article {pmid30763758, year = {2019}, author = {Jowers, MJ and Sánchez-Ramírez, S and Lopes, S and Karyakin, I and Dombrovski, V and Qninba, A and Valkenburg, T and Onofre, N and Ferrand, N and Beja, P and Palma, L and Godinho, R}, title = {Unravelling population processes over the Late Pleistocene driving contemporary genetic divergence in Palearctic buzzards.}, journal = {Molecular phylogenetics and evolution}, volume = {134}, number = {}, pages = {269-281}, doi = {10.1016/j.ympev.2019.02.004}, pmid = {30763758}, issn = {1095-9513}, mesh = {Animals ; Arctic Regions ; Bayes Theorem ; Birds/*genetics ; Climate Change ; DNA, Mitochondrial/genetics ; Demography ; Genetic Markers ; *Genetic Variation ; *Genetics, Population ; Haplotypes/genetics ; Microsatellite Repeats/genetics ; Mitochondria/genetics ; Mutation Rate ; *Paleontology ; Phylogeny ; Phylogeography ; Sequence Analysis, DNA ; Species Specificity ; Time Factors ; }, abstract = {Population range expansions and contractions as a response to climate and habitat change throughout the Quaternary are known to have contributed to complex phylogenetic and population genetic events. Speciation patterns and processes in Palearctic buzzards (genus Buteo) are a long-standing example of morphological and genetic data incongruence, attributed to panmixia, habitat range shifts, contact zones, and climate change. Here we assess the systematics, phylogeography and population genetic structure of three nominal species of Palearctic buzzards, Buteo buteo (including B. b. vulpinus), B. rufinus (including B. r. cirtensis) and B. hemilasius. Phylogenetic analyses inferred from mitochondrial data recover B. hemilasius as sister to the sister clades B. r. rufinus and B. buteo complex (B. b. buteo, B. b. vulpinus, but also including B. r. cirtensis). In contrast, we find an unresolved genetic delimitation inferred from four nuclear loci, suggesting an ancestral genetic pool for all species. Time-trees suggest population contractions and expansions throughout the Pleistocene, which likely reflect habitat change and contrasting ecological niche requirements between species. Microsatellite-based extended Bayesian skyline plots reveal relatively constant population sizes for B. hemilasius, B. r. rufinus, and B. b. vulpinus, in contrast to a dramatic population expansion in B. r. cirtensis within the last 3 kya. Overall, our study illustrates how complex population processes over the Late Pleistocene have shaped the patterns of genetic divergence in Palearctic buzzards, due to the joint effects of shared ancestral polymorphisms, population expansions and contractions, with hybridization at contact zones leading to admixture and introgression.}, }
@article {pmid30641272, year = {2019}, author = {Tang, Y and Li, C and Wanghe, K and Feng, C and Tong, C and Tian, F and Zhao, K}, title = {Convergent evolution misled taxonomy in schizothoracine fishes (Cypriniformes: Cyprinidae).}, journal = {Molecular phylogenetics and evolution}, volume = {134}, number = {}, pages = {323-337}, doi = {10.1016/j.ympev.2019.01.008}, pmid = {30641272}, issn = {1095-9513}, mesh = {Animals ; Bayes Theorem ; *Biological Evolution ; Cyprinidae/*classification/genetics ; DNA, Mitochondrial/genetics ; Diet ; Genome ; Geography ; Mitochondria/genetics ; Phylogeny ; Polymorphism, Single Nucleotide/genetics ; Tibet ; Time Factors ; }, abstract = {Highly specialized grade (HSG; genera Gymnocypris, Oxygymnocypris, Schizopygopsis, Platypharodon and Chuanchia) of the Schizothoracinae (Cypriniformes: Cyprinidae) are endemic to the Qinghai-Tibet Plateau (QTP). Previously, two distinct ecomorphs were recognized according to trophic traits. One was a limnetic omnivore with normal lower jaw morphology, terminal mouth, and moderate or dense gill rakers, mostly inhabiting in open water of lakes, including Gymnocypris and Oxygymnocypris. Another was a benthic feeder with inferior mouth, sparse gill rakers and sharp horny sheath on the lower jaw for scraping of attached prey off hard substrates, including Schizopygopsis, Platypharodon and Chuanchia. However, traditional taxonomy of HSG based on these trophic traits presented extensive conflicts with the molecular studies in recent years. The possible cause could be convergent evolution in morphology, retention of ancestral polymorphisms or mitochondrial introgression, but these hypotheses could not be assessed due to incomplete taxon sampling and only mitochondrial data employed in previous works. Here, we conducted the most comprehensive molecular analysis on HSG fishes to date, using four mitochondrial loci and 152,464 genome-wide SNPs, and including 21 of 24 putative species and one undescribed Schizopygopsis species. Both SNP and mtDNA trees confirmed extensive paraphyly of genera Gymnocypris and Schizopygopsis, where species often were clustered together by watershed instead of by genus. Basal split into the north clade B and the south clade C (ca. 3.03 Ma) approximately by the Tanggula-Tanitawen Mountains in SLAF tree coincided with a violent uplift of the QTP during the phase A of 'Qingzang movement' (ca. 3.6 Ma). Ancestral state reconstruction of the trophic ecomorph showed that the limnetic omnivore ecomorph had evolved repeatedly in clade B and C. Furthermore, we presented a striking case of convergent evolution between two 'subspecies' Gymnocypris chui chui and G. chui longimandibularis, which had diverged as early as two million years ago (ca. 2.42 Ma). Ecological analyses revealed that similar food utilization, particularly in zooplankton, was the main underlying driving force. This work showed an example of taxonomy with the most extensive errors at the genus/species levels due to convergent evolution and suggested that trophic traits could be misleading in fish taxonomy. Therefore, we propose a major generic revision for HSG species.}, }
@article {pmid31203379, year = {2019}, author = {Bloomfield, G}, title = {The molecular foundations of zygosis.}, journal = {Cellular and molecular life sciences : CMLS}, volume = {}, number = {}, pages = {}, doi = {10.1007/s00018-019-03187-1}, pmid = {31203379}, issn = {1420-9071}, abstract = {Zygosis is the generation of new biological individuals by the sexual fusion of gamete cells. Our current understanding of eukaryotic phylogeny indicates that sex is ancestral to all extant eukaryotes. Although sexual development is extremely diverse, common molecular elements have been retained. HAP2-GCS1, a protein that promotes the fusion of gamete cell membranes that is related in structure to certain viral fusogens, is conserved in many eukaryotic lineages, even though gametes vary considerably in form and behaviour between species. Similarly, although zygotes have dramatically different forms and fates in different organisms, diverse eukaryotes share a common developmental programme in which homeodomain-containing transcription factors play a central role. These common mechanistic elements suggest possible common evolutionary histories that, if correct, would have profound implications for our understanding of eukaryogenesis.}, }
@article {pmid31040181, year = {2019}, author = {Reis, LMD and Adamoski, D and Ornitz Oliveira Souza, R and Rodrigues Ascenção, CF and Sousa de Oliveira, KR and Corrêa-da-Silva, F and Malta de Sá Patroni, F and Meira Dias, M and Consonni, SR and Mendes de Moraes-Vieira, PM and Silber, AM and Dias, SMG}, title = {Dual inhibition of glutaminase and carnitine palmitoyltransferase decreases growth and migration of glutaminase inhibition-resistant triple-negative breast cancer cells.}, journal = {The Journal of biological chemistry}, volume = {294}, number = {24}, pages = {9342-9357}, doi = {10.1074/jbc.RA119.008180}, pmid = {31040181}, issn = {1083-351X}, abstract = {Triple-negative breast cancers (TNBCs) lack progesterone and estrogen receptors and do not have amplified human epidermal growth factor receptor 2, the main therapeutic targets for managing breast cancer. TNBCs have an altered metabolism, including an increased Warburg effect and glutamine dependence, making the glutaminase inhibitor CB-839 therapeutically promising for this tumor type. Accordingly, CB-839 is currently in phase I/II clinical trials. However, not all TNBCs respond to CB-839 treatment, and the tumor resistance mechanism is not yet fully understood. Here we classified cell lines as CB-839-sensitive or -resistant according to their growth responses to CB-839. Compared with sensitive cells, resistant cells were less glutaminolytic and, upon CB-839 treatment, exhibited a smaller decrease in ATP content and less mitochondrial fragmentation, an indicator of poor mitochondrial health. Transcriptional analyses revealed that the expression levels of genes linked to lipid metabolism were altered between sensitive and resistant cells and between breast cancer tissues (available from The Cancer Genome Atlas project) with low versus high glutaminase (GLS) gene expression. Of note, CB-839-resistant TNBC cells had increased carnitine palmitoyltransferase 2 (CPT2) protein and CPT1 activity levels. In agreement, CB-839-resistant TNBC cells mobilized more fatty acids into mitochondria for oxidation, which responded to AMP-activated protein kinase and acetyl-CoA carboxylase signaling. Moreover, chemical inhibition of both glutaminase and CPT1 decreased cell proliferation and migration of CB-839-resistant cells compared with single inhibition of each enzyme. We propose that dual targeting of glutaminase and CPT1 activities may have therapeutic relevance for managing CB-839-resistant tumors.}, }
@article {pmid31196888, year = {2019}, author = {Pan, Z and Ren, X and Zhao, H and Liu, L and Tan, Z and Qiu, F}, title = {A Mitochondrial Transcription Termination Factor, ZmSmk3, Is Required for nad1 Intron4 and nad4 Intron1 Splicing and Kernel Development in Maize.}, journal = {G3 (Bethesda, Md.)}, volume = {}, number = {}, pages = {}, doi = {10.1534/g3.119.400265}, pmid = {31196888}, issn = {2160-1836}, abstract = {The expression systems of the mitochondrial genes are derived from their bacterial ancestors, but have evolved many new features in their eukaryotic hosts. Mitochondrial RNA splicing is a complex process regulated by families of nucleus-encoded RNA-binding proteins, few of which have been characterized in maize (Zea mays L.). Here, we identified the Zea mays small kernel3 (Zmsmk3) candidate gene, which encodes a mitochondrial transcription termination factor (mTERF) containing two mTERF motifs, which is conserved in monocotyledon; and the target introns were also quite conserved during evolution between monocotyledons and dicotyledons. The mutations of Zmsmk3 led to arrested embryo and endosperm development, resulting in small kernels. A transcriptome of 12 days after pollination endosperm analysis revealed that the starch biosynthetic pathway and the zein gene family were down-regulated in the Zmsmk3 mutant kernels. ZmSMK3 is localized in mitochondria. The reduced expression of ZmSmk3 in the mutant resulted in the splicing deficiency of mitochondrial nad4 intron1 and nad1 intron4, causing a reduction in complex I assembly and activity, impairing mitochondria structure and activating the alternative respiratory pathway. So, the results suggest that ZmSMK3 is required for the splicing of nad4 intron 1 and nad1 intron 4, complex I assembly and kernel development in maize.}, }
@article {pmid31196150, year = {2018}, author = {Gerlitz, M and Knopp, M and Kapust, N and Xavier, JC and Martin, WF}, title = {Elusive data underlying debate at the prokaryote-eukaryote divide.}, journal = {Biology direct}, volume = {13}, number = {1}, pages = {21}, doi = {10.1186/s13062-018-0221-x}, pmid = {31196150}, issn = {1745-6150}, support = {666053//European Research Council/International ; I-1321-203.13/2015//German-Israeli Foundation for Scientific Research and Development/ ; 93 046//Volkswagen Foundation/ ; }, abstract = {BACKGROUND: The origin of eukaryotic cells was an important transition in evolution. The factors underlying the origin and evolutionary success of the eukaryote lineage are still discussed. One camp argues that mitochondria were essential for eukaryote origin because of the unique configuration of internalized bioenergetic membranes that they conferred to the common ancestor of all known eukaryotic lineages. A recent paper by Lynch and Marinov concluded that mitochondria were energetically irrelevant to eukaryote origin, a conclusion based on analyses of previously published numbers of various molecules and ribosomes per cell and cell volumes as a presumed proxy for the role of mitochondria in evolution. Their numbers were purportedly extracted from the literature.<br><br>RESULTS: We have examined the numbers upon which the recent study was based. We report that for a sample of 80 numbers that were purportedly extracted from the literature and that underlie key inferences of the recent study, more than 50% of the values do not exist in the cited papers to which the numbers are attributed. The published result cannot be independently reproduced. Other numbers that the recent study reports differ inexplicably from those in the literature to which they are ascribed. We list the discrepancies between the recently published numbers and the purported literature sources of those numbers in a head to head manner so that the discrepancies are readily evident, although the source of error underlying the discrepancies remains obscure.<br><br>CONCLUSION: The data purportedly supporting the view that mitochondria had no impact upon eukaryotic evolution data exhibits notable irregularities. The paper in question evokes the impression that the published numbers are of up to seven significant digit accuracy, when in fact more than half the numbers are nowhere to be found in the literature to which they are attributed. Though the reasons for the discrepancies are unknown, it is important to air these issues, lest the prominent paper in question become a point source of a snowballing error through the literature or become interpreted as a form of evidence that mitochondria were irrelevant to eukaryote evolution.<br><br>REVIEWERS: This article was reviewed by Eric Bapteste, Jianzhi Zhang and Martin Lercher.}, }
@article {pmid31002891, year = {2019}, author = {Araujo, NS and Arias, MC}, title = {Mitochondrial genome characterization of Melipona bicolor: Insights from the control region and gene expression data.}, journal = {Gene}, volume = {705}, number = {}, pages = {55-59}, doi = {10.1016/j.gene.2019.04.042}, pmid = {31002891}, issn = {1879-0038}, mesh = {Animals ; Base Composition ; Bees/*genetics ; Evolution, Molecular ; Gene Expression Profiling/*methods ; Gene Expression Regulation ; Genome Size ; *Genome, Mitochondrial ; Male ; Mitochondria/*genetics ; RNA, Ribosomal/genetics ; Sequence Analysis, DNA ; Sequence Analysis, RNA ; }, abstract = {The stingless bee Melipona bicolor is the only bee in which true polygyny occurs. Its mitochondrial genome was first sequenced in 2008, but it was incomplete and no information about its transcription was known. We combined short and long reads of M. bicolor DNA with RNASeq data to obtain insights about mitochondrial evolution and gene expression in bees. The complete genome has 15,001 bp, including a control region of 255 bp that contains all conserved structures described in honeybees with the highest AT content reported so far for bees (98.1%), displaying a compact but functional region. Gene expression control is similar to other insects however unusual patterns of expression may suggest the existence of different isoforms for the mitochondrially encoded 12S rRNA. Results reveal unique and shared features of the mitochondrial genome in terms of sequence evolution and gene expression making M. bicolor an interesting model to study mitochondrial genomic evolution.}, }
@article {pmid30753887, year = {2019}, author = {Ni, Y and Ma, X and Hu, W and Blair, D and Yin, M}, title = {New lineages and old species: Lineage diversity and regional distribution of Moina (Crustacea: Cladocera) in China.}, journal = {Molecular phylogenetics and evolution}, volume = {134}, number = {}, pages = {87-98}, doi = {10.1016/j.ympev.2019.02.007}, pmid = {30753887}, issn = {1095-9513}, mesh = {Alleles ; Animals ; Bayes Theorem ; China ; Cladocera/anatomy &amp; histology/*classification/*genetics ; DNA, Mitochondrial/genetics ; Electron Transport Complex IV/genetics ; *Genetic Variation ; Geography ; Haplotypes/genetics ; Mitochondria/genetics ; *Phylogeny ; Time Factors ; }, abstract = {The distribution and genetic diversity of freshwater zooplankton is understudied in the Eastern Palearctic. Here, we explored the lineage diversity and regional distribution of the genus Moina in China. Members of this genus are often keystone components of freshwater ecosystems and have been frequently subjected to toxicological and physiological studies. Four species of Moina were identified, based on morphology, in 50 of 113 Chinese water bodies examined, and their phylogenetic position was analyzed using both a mitochondrial (mitochondrial cytochrome c oxidase subunit I; COI) and a nuclear marker (the nuclear internal transcribed spacer; ITS-1). Both molecular markers identified four clades corresponding broadly to the morphological species. Mitochondrial DNA analysis showed the presence of four species complexes with eleven lineages across China, five of which were new. However, some lineages (and even individual haplotypes) were widespread in Eurasia, suggesting an ability to disperse over long distances. In contrast, a few lineages exhibited restricted distributions. The nuclear phylogeny also recognized four species of Moina within China and seven very distinct clades. Interestingly, one specimen possessing Moina cf. micrura mtDNA had ITS-1 alleles of the M. cf. brachiata clade. This discordance between mtDNA and nuclear ITS-1 phylogenies is indicative of interspecific introgression and hybridization. Additionally, our COI phylogeny showed apparent paraphyly in two Moina species groups, suggesting introgression of their mitochondrial genomes. Our data shows the regional distribution/diversity of the Moina species complex in a Eurasian context.}, }
@article {pmid29885222, year = {2017}, author = {Rydin, C and Wikström, N and Bremer, B}, title = {Conflicting results from mitochondrial genomic data challenge current views of Rubiaceae phylogeny.}, journal = {American journal of botany}, volume = {104}, number = {10}, pages = {1522-1532}, doi = {10.3732/ajb.1700255}, pmid = {29885222}, issn = {1537-2197}, mesh = {Genome, Mitochondrial/*genetics ; Genome, Plant/*genetics ; High-Throughput Nucleotide Sequencing ; Mitochondria/genetics ; Phylogeny ; Rubiaceae/*genetics ; Sequence Analysis, DNA ; }, abstract = {PREMISE OF THE STUDY: Reconstruction of plant phylogeny has heavily relied on single-gene or multigene plastid data. New sequencing methods have led to an increasing number of studies based on data from the entire plastid, but the mitochondrion has rarely been used to infer plant phylogeny because of an assumed information poverty and demonstrated lateral transfer of mitochondrial gene regions between distantly related species.<br><br>METHODS: We explored phylogenetic information from the plant mitochondrion using 57 representatives of the species-rich coffee family as study system and assessed consistency with previous results based (mostly) on plastid data.<br><br>KEY RESULTS: We showed that the mitochondrial genome can provide structured and statistically significant information on plant phylogeny. While most of our results are consistent with those based on plastid data, some surprising and statistically significant conflicts emerge, and our study demonstrates with striking clarity that the phylogeny of Rubiaceae is far from resolved.<br><br>CONCLUSIONS: It appears unlikely that conflicts between results retrieved from the different genomic compartments would be restricted to Rubiaceae. Rather, they are probably a general phenomenon and an important factor behind longstanding &quot;difficult&quot; phylogenetic questions. The biological processes responsible for the conflicting results detected here are unclear, but some conflicts are likely caused by hybridization events that occurred tens of millions of years ago. Whether such ancient events can be reconstructed based on molecular data from extant plants remains to be seen, but future studies of the nuclear genome may provide a way forward.}, }
@article {pmid29318727, year = {2018}, author = {Kaur, B and Valach, M and Peña-Diaz, P and Moreira, S and Keeling, PJ and Burger, G and Lukeš, J and Faktorová, D}, title = {Transformation of Diplonema papillatum, the type species of the highly diverse and abundant marine microeukaryotes Diplonemida (Euglenozoa).}, journal = {Environmental microbiology}, volume = {20}, number = {3}, pages = {1030-1040}, doi = {10.1111/1462-2920.14041}, pmid = {29318727}, issn = {1462-2920}, support = {MOP 70309//CIHR/Canada ; }, mesh = {Aquatic Organisms ; Drug Resistance ; Euglenozoa/genetics/*physiology ; Eukaryota/genetics ; Gene Expression Regulation ; Mitochondria ; Phylogeny ; Puromycin/pharmacology ; RNA, Messenger/genetics/metabolism ; *Transformation, Genetic ; }, abstract = {Diplonema papillatum is the type species of diplonemids, which are among the most abundant and diverse heterotrophic microeukaryotes in the world's oceans. Diplonemids are also known for a unique form of post-transcriptional processing in mitochondria. However, the lack of reverse genetics methodologies in these protists has hampered elucidation of their cellular and molecular biology. Here we report a protocol for D. papillatum transformation. We have identified several antibiotics to which D. papillatum is sensitive and thus are suitable selectable markers, and focus in particular on puromycin. Constructs were designed encoding antibiotic resistance markers, fluorescent tags, and additional genomic sequences from D. papillatum to facilitate vector integration into chromosomes. We established conditions for effective electroporation, and demonstrate that electroporated constructs can be stably integrated in the D. papillatum nuclear genome. In D. papillatum transformants, the heterologous puromycin resistance gene is transcribed into mRNA and translated into protein, as determined by Southern hybridization, reverse transcription, and Western blot analyses. This is the first documented case of transformation in a euglenozoan protist outside the well-studied kinetoplastids, making D. papillatum a genetically tractable organism and potentially a model system for marine microeukaryotes.}, }
@article {pmid31179502, year = {2019}, author = {Schober, AF and Rï O Bï Rtulos, C and Bischoff, A and Lepetit, B and Gruber, A and Kroth, PG}, title = {Organelle Studies and Proteome Analyses on Mitochondria and Plastids Fractions from the Diatom Thalassiosira pseudonana.}, journal = {Plant &amp; cell physiology}, volume = {}, number = {}, pages = {}, doi = {10.1093/pcp/pcz097}, pmid = {31179502}, issn = {1471-9053}, abstract = {Diatoms are unicellular algae and evolved by secondary endosymbiosis, a process in which a red alga-like eukaryote was engulfed by a heterotrophic eukaryotic cell. This gave rise to plastids of remarkable complex architecture and ultrastructure that require elaborate protein importing, trafficking, signaling and intracellular cross-talk pathways. Studying both plastids and mitochondria and their distinctive physiological pathways in organello may greatly contribute to our understanding of photosynthesis, mitochondrial respiration, and diatom evolution. The isolation of such complex organelles, however, is still demanding, and existing protocols are either limited to a few species (for plastids) or have not been reported for diatoms so far (for mitochondria). In this work, we present the first isolation protocol for mitochondria from the model diatom Thalassiosira pseudonana. Apart from that, we extended the protocol so that it is also applicable for the purification of a high-quality plastids fraction, and provide detailed structural and physiological characterizations of the resulting organelles. Isolated mitochondria were structurally intact, showed clear evidence of mitochondrial respiration, but the fractions still contained residual cell fragments. In contrast, plastid isolates were virtually free of cellular contaminants, featured structurally preserved thylakoids performing electron transport, but lost most of their stromal components as concluded from western blots and mass spectrometry. LC-ESI-MS/MS studies on mitochondria and thylakoids, moreover, allowed detailed proteome analyses which resulted in extensive proteome maps for both plastids and mitochondria thus helping us to broaden our understanding of organelle metabolism and functionality in diatoms.}, }
@article {pmid31170405, year = {2019}, author = {Edgar, JA}, title = {L-Ascorbic Acid and the Evolution of Multicellular Eukaryotes.}, journal = {Journal of theoretical biology}, volume = {}, number = {}, pages = {}, doi = {10.1016/j.jtbi.2019.06.001}, pmid = {31170405}, issn = {1095-8541}, abstract = {The lifeless earth was formed around 4.5 billion years ago and the first anaerobic unicellular &quot;organisms&quot; may have appeared half a billion years later. Despite subsequent prokaryotes (bacteria and archaea) evolving quite complex biochemistry and some eukaryote characteristics, the transition from unicellular prokaryotes to multicellular, aerobic eukaryotes took a further 2.5 billion years to begin. The key factor or factors that eventually caused this long-delayed transition is a question that has been a focus of considerable research and a topic of discussion over many years. On the basis of the extensive literature available and consideration of some of the characteristics that distinguish multicellular eukaryotes from prokaryotes, it is proposed that, as well as the development of oxygenic photosynthesis producing high levels of environmental oxygen and the formation of vital organelles such as aerobic adenosine triphosphate-generating mitochondria, the concurrent evolution of the L-ascorbic acid redox system should be considered as a key factor that led to the evolution of multicellular eukaryotes and it remains vitally involved in the maintenance of multicellularity and many other eukaryote characteristics.}, }
@article {pmid31163164, year = {2019}, author = {Havird, JC and Forsythe, ES and Williams, AM and Werren, JH and Dowling, DK and Sloan, DB}, title = {Selfish Mitonuclear Conflict.}, journal = {Current biology : CB}, volume = {29}, number = {11}, pages = {R496-R511}, doi = {10.1016/j.cub.2019.03.020}, pmid = {31163164}, issn = {1879-0445}, abstract = {Mitochondria, a nearly ubiquitous feature of eukaryotes, are derived from an ancient symbiosis. Despite billions of years of cooperative coevolution - in what is arguably the most important mutualism in the history of life - the persistence of mitochondrial genomes also creates conditions for genetic conflict with the nucleus. Because mitochondrial genomes are present in numerous copies per cell, they are subject to both within- and among-organism levels of selection. Accordingly, 'selfish' genotypes that increase their own proliferation can rise to high frequencies even if they decrease organismal fitness. It has been argued that uniparental (often maternal) inheritance of cytoplasmic genomes evolved to curtail such selfish replication by minimizing within-individual variation and, hence, within-individual selection. However, uniparental inheritance creates conditions for cytonuclear conflict over sex determination and sex ratio, as well as conditions for sexual antagonism when mitochondrial variants increase transmission by enhancing maternal fitness but have the side-effect of being harmful to males (i.e., 'mother's curse'). Here, we review recent advances in understanding selfish replication and sexual antagonism in the evolution of mitochondrial genomes and the mechanisms that suppress selfish interactions, drawing parallels and contrasts with other organelles (plastids) and bacterial endosymbionts that arose more recently. Although cytonuclear conflict is widespread across eukaryotes, it can be cryptic due to nuclear suppression, highly variable, and lineage-specific, reflecting the diverse biology of eukaryotes and the varying architectures of their cytoplasmic genomes.}, }
@article {pmid31153884, year = {2019}, author = {Wu, Q and Lan, Y and Cao, X and Yao, H and Qiao, D and Xu, H and Cao, Y}, title = {Characterization and diverse evolution patterns of glycerol-3-phosphate dehydrogenase family genes in Dunaliella salina.}, journal = {Gene}, volume = {}, number = {}, pages = {}, doi = {10.1016/j.gene.2019.05.056}, pmid = {31153884}, issn = {1879-0038}, abstract = {The glycerol-3-phosphate dehydrogenase (GPD) gene family plays a major role in glycerol synthesis and adaptation to abiotic stresses. Few studies on GPD family genes from the halotolerant algae Dunaliella salina are available. In this study, seven DsaGPD genes were identified by mining D. salina sequencing data. Among them, DsaGPD5 contained the canonical NAD+-GPD protein domain, called si-GPD. In comparison, DsaGPD1-4 not only contained the canonical NAD+-GPD domain but also a unique domain, the haloacid dehalogenase (HAD)-like superfamily domain, in their N-terminal region, called bi-GPD. DsaGPD6, 7 contained the FAD+-GPD domain. In the transient expression system, DsaGPD1, 3, 4 were found in the cytosol of Arabidopsis thaliana protoplast, DsaGPD2, 5 in the chloroplast, and DsaGPD6, 7 in the mitochondria. MEME analysis showed that six conserved motifs were present in both si-GPDs and bi-GPDs, whereas seven highly conserved motifs were only present in bi-GPDs. The quantitative real-time PCR results showed significant induction of the DsaGPD genes under abiotic stresses, indicating their tolerance-related role in D. salina. DsaGPD2 and DsaGPD5 may be the osmoregulator form and glyceride form in the chloroplast, respectively. The evolutionary forces acting on si-GPDs and bi-GPDs were different in the same organism: bi-GPDs were under purifying selection, while si-GPDs were mainly under positive selection. Furthermore, evolution of the N_HAD domain and C_GPD domain in bi-GPDs is highly correlated. In summary, this study characterizes DsaGPD gene family members and provides useful information for elucidating the salt tolerance mechanism in D. salina.}, }
@article {pmid31151779, year = {2019}, author = {Sihali-Beloui, O and Aroune, D and Benazouz, F and Hadji, A and El-Aoufi, S and Marco, S}, title = {A hypercaloric diet induces hepatic oxidative stress, infiltration of lymphocytes, and mitochondrial reshuffle in Psammomys obesus, a murine model of insulin resistance.}, journal = {Comptes rendus biologies}, volume = {}, number = {}, pages = {}, doi = {10.1016/j.crvi.2019.04.003}, pmid = {31151779}, issn = {1768-3238}, abstract = {The aim of this study was to show, for the first time, the effect of a hypercaloric diet on the mitochondrial reshuffle of hepatocytes during the progression from steatosis to steatohepatitis to cirrhosis in Psammomys obesus, a typical animal model of the metabolic syndrome. Metabolic and oxidative stresses were induced by feeding the animal through a standard laboratory diet (SD) for nine months. Metabolic parameters, liver malondialdehyde (MDA) and glutathione (GSH), were evaluated. The pathological evolution was examined by histopathology and immunohistochemistry, using CD3 and CD20 antibodies. The dynamics of the mitochondrial structure was followed by transmission electron microscopy. SD induced a steatosis in this animal that evolved under the effect of oxidative and metabolic stress by the appearance of adaptive inflammation and fibrosis leading the animal to the cirrhosis stage with serious hepatocyte damage by the triggering, at first the mitochondrial fusion-fission cycles, which attempted to maintain the mitochondria intact and functional, but the hepatocellular oxidative damage was increased inducing a vicious circle of mitochondrial alteration and dysfunction and their elimination by mitophagy. P. obesus is an excellent animal model of therapeutic research that targets mitochondrial dysfunction in the progression of steatosis.}, }
@article {pmid31150090, year = {2019}, author = {Yin, HZ and Wang, HL and Ji, SG and Medvedeva, YV and Tian, G and Bazrafkan, AK and Maki, NZ and Akbari, Y and Weiss, JH}, title = {Rapid Intramitochondrial Zn2+ Accumulation in CA1 Hippocampal Pyramidal Neurons After Transient Global Ischemia: A Possible Contributor to Mitochondrial Disruption and Cell Death.}, journal = {Journal of neuropathology and experimental neurology}, volume = {}, number = {}, pages = {}, doi = {10.1093/jnen/nlz042}, pmid = {31150090}, issn = {1554-6578}, abstract = {Mitochondrial Zn2+ accumulation, particularly in CA1 neurons, occurs after ischemia and likely contributes to mitochondrial dysfunction and subsequent neurodegeneration. However, the relationship between mitochondrial Zn2+ accumulation and their disruption has not been examined at the ultrastructural level in vivo. We employed a cardiac arrest model of transient global ischemia (TGI), combined with Timm's sulfide silver labeling, which inserts electron dense metallic silver granules at sites of labile Zn2+ accumulation, and used transmission electron microscopy (TEM) to examine subcellular loci of the Zn2+ accumulation. In line with prior studies, TGI-induced damage to CA1 was far greater than to CA3 pyramidal neurons, and was substantially progressive in the hours after reperfusion (being significantly greater after 4- than 1-hour recovery). Intriguingly, TEM examination of Timm's-stained sections revealed substantial Zn2+ accumulation in many postischemic CA1 mitochondria, which was strongly correlated with their swelling and disruption. Furthermore, paralleling the evolution of neuronal injury, both the number of mitochondria containing Zn2+ and the degree of their disruption were far greater at 4- than 1-hour recovery. These data provide the first direct characterization of Zn2+ accumulation in CA1 mitochondria after in vivo TGI, and support the idea that targeting these events could yield therapeutic benefits.}, }
@article {pmid30584918, year = {2019}, author = {Lavin, BR and Girman, DJ}, title = {Phylogenetic relationships and divergence dating in the Glass Lizards (Anguinae).}, journal = {Molecular phylogenetics and evolution}, volume = {133}, number = {}, pages = {128-140}, doi = {10.1016/j.ympev.2018.12.022}, pmid = {30584918}, issn = {1095-9513}, mesh = {Animals ; Bayes Theorem ; Cell Nucleus/genetics ; DNA, Mitochondrial/genetics ; Geography ; Lizards/*classification/genetics ; Mitochondria/genetics ; *Phylogeny ; Probability ; Sequence Analysis, DNA ; Species Specificity ; Time Factors ; }, abstract = {The Glass Lizards are a subfamily (Anguinae) of Anguid Lizards with an elongated limbless body plan that occur throughout the Northern Hemisphere primarily in North America, Europe, and Asia, but also have a presence in North Africa and Indonesia. We used twenty-five nuclear loci (15,191 bp) and 2090 bp of the mtDNA genome to generate a phylogeny containing all known species groups to explore species relationships within the group as well as divergence dating. We also examined the group in the context of a coalescent species tree analysis and species delimitation. All major lineages were found to be monophyletic with potential cryptic diversity in some. The Anguinae first appeared in the Eocene and most lineages were present by the beginning of the Miocene. The Anguinae originated in Europe from an Anguidae ancestor that crossed the Thulean land bridge, spreading to Asia after the drying of the Turgai Sea, then across Beringia as the climate permitted. A species tree analyses found support for the major Anguinae lineages and species delimitation supported accepted species.}, }
@article {pmid30297026, year = {2018}, author = {Porcelli, V and Vozza, A and Calcagnile, V and Gorgoglione, R and Arrigoni, R and Fontanesi, F and Marobbio, CMT and Castegna, A and Palmieri, F and Palmieri, L}, title = {Molecular identification and functional characterization of a novel glutamate transporter in yeast and plant mitochondria.}, journal = {Biochimica et biophysica acta. Bioenergetics}, volume = {1859}, number = {11}, pages = {1249-1258}, doi = {10.1016/j.bbabio.2018.08.001}, pmid = {30297026}, issn = {1879-2650}, mesh = {Amino Acid Transport System X-AG/*metabolism ; Arabidopsis/*metabolism ; Arabidopsis Proteins/*metabolism ; Gene Deletion ; Glutamic Acid/metabolism ; Hydrogen-Ion Concentration ; Kinetics ; Membrane Transport Proteins/*metabolism ; Mitochondria/*metabolism ; Phylogeny ; Proteolipids ; Recombinant Proteins/metabolism ; Saccharomyces cerevisiae/genetics/*metabolism ; Saccharomyces cerevisiae Proteins/*metabolism ; Substrate Specificity ; Time Factors ; }, abstract = {The genome of Saccharomyces cerevisiae encodes 35 members of the mitochondrial carrier family (MCF) and 58 MCF members are coded by the genome of Arabidopsis thaliana, most of which have been functionally characterized. Here two members of this family, Ymc2p from S. cerevisiae and BOU from Arabidopsis, have been thoroughly characterized. These proteins were overproduced in bacteria and reconstituted into liposomes. Their transport properties and kinetic parameters demonstrate that Ymc2p and BOU transport glutamate, and to a much lesser extent L-homocysteinesulfinate, but not other amino acids and many other tested metabolites. Transport catalyzed by both carriers was saturable, inhibited by mercuric chloride and dependent on the proton gradient across the proteoliposomal membrane. The growth phenotype of S. cerevisiae cells lacking the genes ymc2 and agc1, which encodes the only other S. cerevisiae carrier capable to transport glutamate besides aspartate, was fully complemented by expressing Ymc2p, Agc1p or BOU. Mitochondrial extracts derived from ymc2Δagc1Δ cells, reconstituted into liposomes, exhibited no glutamate transport at variance with wild-type, ymc2Δ and agc1Δ cells, showing that S. cerevisiae cells grown in the presence of acetate do not contain additional mitochondrial transporters for glutamate besides Ymc2p and Agc1p. Furthermore, mitochondria isolated from wild-type, ymc2Δ and agc1Δ strains, but not from the double mutant ymc2Δagc1Δ strain, swell in isosmotic ammonium glutamate showing that glutamate is transported by Ymc2p and Agc1p together with a H+. It is proposed that the function of Ymc2p and BOU is to transport glutamate across the mitochondrial inner membrane and thereby play a role in intermediary metabolism, C1 metabolism and mitochondrial protein synthesis.}, }
@article {pmid30071011, year = {2018}, author = {Grinter, R and Hay, ID and Song, J and Wang, J and Teng, D and Dhanesakaran, V and Wilksch, JJ and Davies, MR and Littler, D and Beckham, SA and Henderson, IR and Strugnell, RA and Dougan, G and Lithgow, T}, title = {FusC, a member of the M16 protease family acquired by bacteria for iron piracy against plants.}, journal = {PLoS biology}, volume = {16}, number = {8}, pages = {e2006026}, pmid = {30071011}, issn = {1545-7885}, support = {106077/Z/14/Z//Wellcome Trust/United Kingdom ; }, mesh = {Bacteria/metabolism ; Bacterial Outer Membrane Proteins/metabolism ; Bacterial Proteins/metabolism ; Ferredoxins/metabolism ; Iron/*metabolism ; Membrane Transport Proteins/*metabolism ; Metalloendopeptidases/metabolism ; Pectobacterium/*metabolism ; Phylogeny ; Plant Proteins/metabolism ; Plants/metabolism ; Protein Transport/physiology ; }, abstract = {Iron is essential for life. Accessing iron from the environment can be a limiting factor that determines success in a given environmental niche. For bacteria, access of chelated iron from the environment is often mediated by TonB-dependent transporters (TBDTs), which are β-barrel proteins that form sophisticated channels in the outer membrane. Reports of iron-bearing proteins being used as a source of iron indicate specific protein import reactions across the bacterial outer membrane. The molecular mechanism by which a folded protein can be imported in this way had remained mysterious, as did the evolutionary process that could lead to such a protein import pathway. How does the bacterium evolve the specificity factors that would be required to select and import a protein encoded on another organism's genome? We describe here a model whereby the plant iron-bearing protein ferredoxin can be imported across the outer membrane of the plant pathogen Pectobacterium by means of a Brownian ratchet mechanism, thereby liberating iron into the bacterium to enable its growth in plant tissues. This import pathway is facilitated by FusC, a member of the same protein family as the mitochondrial processing peptidase (MPP). The Brownian ratchet depends on binding sites discovered in crystal structures of FusC that engage a linear segment of the plant protein ferredoxin. Sequence relationships suggest that the bacterial gene encoding FusC has previously unappreciated homologues in plants and that the protein import mechanism employed by the bacterium is an evolutionary echo of the protein import pathway in plant mitochondria and plastids.}, }
@article {pmid29691935, year = {2018}, author = {Henry, LP and Newton, ILG}, title = {Mitochondria and Wolbachia titers are positively correlated during maternal transmission.}, journal = {Molecular ecology}, volume = {27}, number = {11}, pages = {2634-2646}, doi = {10.1111/mec.14700}, pmid = {29691935}, issn = {1365-294X}, mesh = {Animals ; Biological Evolution ; Drosophila melanogaster/genetics ; Female ; Gene Expression/genetics ; Genotype ; Infectious Disease Transmission, Vertical ; Mitochondria/*genetics ; NADH Dehydrogenase/genetics ; Symbiosis/genetics ; Wolbachia/*genetics ; }, abstract = {Mothers provide their offspring with symbionts. Maternally transmitted, intracellular symbionts must disperse from mother to offspring with other cytoplasmic elements, like mitochondria. Here, we investigated how the intracellular symbiont Wolbachia interacts with mitochondria during maternal transmission. Mitochondria and Wolbachia may interact antagonistically and compete as each population tries to ensure its own evolutionary success. Alternatively, mitochondria and Wolbachia may cooperate as both benefit from ensuring the fitness of the mother. We characterized the relationship between mitochondria and Wolbachia titers in ovaries of Drosophila melanogaster. We found that mitochondria and Wolbachia titers are positively correlated in common laboratory genotypes of D. melanogaster. We attempted to perturb this covariation through the introduction of Wolbachia variants that colonize at different titers. We also attempted to perturb the covariation through manipulating the female reproductive tract to disrupt maternal transmission. Finally, we also attempted to disrupt the covariation by knocking down gene expression for two loci involved in mitochondrial metabolism: NADH dehydrogenase and a mitochondrial transporter. Overall, we find that mitochondria and Wolbachia titers are commonly positively correlated, but this positive covariation is disrupted at high titers of Wolbachia. Our results suggest that mitochondria and Wolbachia have likely evolved mechanisms to stably coexist, but the competitive dynamics change at high Wolbachia titers. We provide future directions to better understand how their interaction influences the maintenance of the symbiosis.}, }
@article {pmid29675902, year = {2018}, author = {Morin, PA and Foote, AD and Baker, CS and Hancock-Hanser, BL and Kaschner, K and Mate, BR and Mesnick, SL and Pease, VL and Rosel, PE and Alexander, A}, title = {Demography or selection on linked cultural traits or genes? Investigating the driver of low mtDNA diversity in the sperm whale using complementary mitochondrial and nuclear genome analyses.}, journal = {Molecular ecology}, volume = {27}, number = {11}, pages = {2604-2619}, doi = {10.1111/mec.14698}, pmid = {29675902}, issn = {1365-294X}, mesh = {Animals ; Cell Nucleus/*genetics ; DNA, Mitochondrial/*genetics ; Demography ; Genetic Variation/*genetics ; Genetics, Population/methods ; Haplotypes/genetics ; Mitochondria/*genetics ; Phylogeny ; Phylogeography/methods ; Population Density ; Sperm Whale/*genetics ; }, abstract = {Mitochondrial DNA has been heavily utilized in phylogeography studies for several decades. However, underlying patterns of demography and phylogeography may be misrepresented due to coalescence stochasticity, selection, variation in mutation rates and cultural hitchhiking (linkage of genetic variation to culturally-transmitted traits affecting fitness). Cultural hitchhiking has been suggested as an explanation for low genetic diversity in species with strong social structures, counteracting even high mobility, abundance and limited barriers to dispersal. One such species is the sperm whale, which shows very limited phylogeographic structure and low mtDNA diversity despite a worldwide distribution and large population. Here, we use analyses of 175 globally distributed mitogenomes and three nuclear genomes to evaluate hypotheses of a population bottleneck/expansion vs. a selective sweep due to cultural hitchhiking or selection on mtDNA as the mechanism contributing to low worldwide mitochondrial diversity in sperm whales. In contrast to mtDNA control region (CR) data, mitogenome haplotypes are largely ocean-specific, with only one of 80 shared between the Atlantic and Pacific. Demographic analyses of nuclear genomes suggest low mtDNA diversity is consistent with a global reduction in population size that ended approximately 125,000 years ago, correlated with the Eemian interglacial. Phylogeographic analysis suggests that extant sperm whales descend from maternal lineages endemic to the Pacific during the period of reduced abundance and have subsequently colonized the Atlantic several times. Results highlight the apparent impact of past climate change, and suggest selection and hitchhiking are not the sole processes responsible for low mtDNA diversity in this highly social species.}, }
@article {pmid30569217, year = {2019}, author = {Nie, Y and Wang, L and Cai, Y and Tao, W and Zhang, YJ and Huang, B}, title = {Mitochondrial genome of the entomophthoroid fungus Conidiobolus heterosporus provides insights into evolution of basal fungi.}, journal = {Applied microbiology and biotechnology}, volume = {103}, number = {3}, pages = {1379-1391}, doi = {10.1007/s00253-018-9549-5}, pmid = {30569217}, issn = {1432-0614}, support = {30770008, 31471821 and 31772226//the National Natural Science Foundation of China/ ; 31872162//National Natural Science Foundation of China/ ; 201601D011065//Natural Science Foundation of Shanxi Province/ ; 2017-015//Shanxi Scholarship Council of China/ ; }, mesh = {Base Composition/genetics ; Base Sequence ; Conidiobolus/classification/*genetics ; DNA, Mitochondrial/*genetics ; Evolution, Molecular ; Genes, Mitochondrial/*genetics ; Genome, Mitochondrial/*genetics ; Mitochondria/*genetics ; Sequence Analysis, DNA ; }, abstract = {Entomophthoroid fungi represent an ecologically important group of fungal pathogens on insects. Here, the whole mitogenome of Conidiobolus heterosporus, one of the entomophthoroid fungi, was described and compared to those early branching fungi with available mitogenomes. The 53,364-bp circular mitogenome of C. heterosporus contained two rRNA genes, 14 standard protein-coding genes, 26 tRNA genes, and three free-standing ORFs. Thirty introns interrupted nine mitochondrial genes. Phylogenetic analysis based on mitochondrion-encoded proteins revealed that C. heterosporus was most close to Zancudomyces culisetae in the Zoopagomycota of basal fungi. Comparison on mitogenomes of 23 basal fungi revealed great variabilities in terms of mitogenome conformation (circular or linear), genetic code (codes 1, 4, or 16), AT contents (53.3-85.5%), etc. These mitogenomes varied from 12.0 to 97.3 kb in sizes, mainly due to different numbers of genes and introns. They showed frequent DNA rearrangement events and a high variability of gene order, although high synteny and conserved gene order were also present between closely related species. By reporting the first mitogenome in Entomophthoromycotina and the second in Zoopagomycota, this study greatly enhanced our understanding on evolution of basal fungi.}, }
@article {pmid31141182, year = {2019}, author = {de Oliveira Boldrini, V and Farias, ADS and Degasperi, GR}, title = {Deciphering targets of Th17 cells fate: from metabolism to nuclear receptors.}, journal = {Scandinavian journal of immunology}, volume = {}, number = {}, pages = {e12793}, doi = {10.1111/sji.12793}, pmid = {31141182}, issn = {1365-3083}, abstract = {Evidence indicates that reprogramming of metabolism is critically important for the differentiation of CD4+ T lymphocytes, and the manipulation of metabolic pathways in these cells may shape their fate and function. Distinct subgroups from T lymphocytes, such as Th17, adopt specific metabolic programs to support their needs. Some important metabolic reactions, such as glycolysis, oxidative phosphorylation are considered important for the differentiation of these lymphocytes. Since their discovery nearly a decade ago, Th17 lymphocytes have received significant attention because of their role in the pathology of several immune-mediated inflammatory diseases such as Multiple Sclerosis. In this review, it will be discussed as the involvement of T cell metabolism and as metabolic reprogramming in activated T cells dictates fate decisions to Th17. The involvement of nuclear receptors such as RORyt e PPARs in the induction of Th17 cells was also discussed. Understanding the metabolic pathways involved in the differentiation of the distinct subgroups of T lymphocytes helps in the design of promising therapeutic proposals.}, }
@article {pmid31139952, year = {2019}, author = {Ghadery, C and Best, LA and Pavese, N and Tai, YF and Strafella, AP}, title = {PET Evaluation of Microglial Activation in Non-neurodegenerative Brain Diseases.}, journal = {Current neurology and neuroscience reports}, volume = {19}, number = {7}, pages = {38}, doi = {10.1007/s11910-019-0951-x}, pmid = {31139952}, issn = {1534-6293}, abstract = {PURPOSE OF THE REVIEW: Microglial cell activation is an important component of neuroinflammation, and it is generally well accepted that chronic microglial activation is indicative of accumulating tissue damage in neurodegenerative conditions, particularly in the earlier stages of disease. Until recently, there has been less focus on the role of neuroinflammation in other forms of neurological and neuropsychiatric conditions. Through this review, we hope to demonstrate the important role TSPO PET imaging has played in illuminating the pivotal role of neuroinflammation and microglial activation underpinning these conditions.<br><br>RECENT FINDINGS: TSPO is an 18 kDa protein found on the outer membrane of mitochondria and can act as a marker of microglial activation using nuclear imaging. Through the development of radiopharmaceuticals targeting TSPO, researchers have been able to better characterise the spatial-temporal evolution of chronic neurological conditions, ranging from the focal autoimmune reactions seen in multiple sclerosis to the Wallerian degeneration at remote parts of the brain months following acute cerebral infarction. Development of novel techniques to investigate neuroinflammation within the central nervous system, for the purposes of diagnosis and therapeutics, has flourished over the past few decades. TSPO has proven itself a robust and sensitive biomarker of microglial activation and neuroimaging affords a minimally invasive technique to characterise neuroinflammatory processes in vivo.}, }
@article {pmid31138949, year = {2019}, author = {Storz, JF and Cheviron, ZA and McClelland, GB and Scott, GR}, title = {Evolution of physiological performance capacities and environmental adaptation: insights from high-elevation deer mice (Peromyscus maniculatus).}, journal = {Journal of mammalogy}, volume = {100}, number = {3}, pages = {910-922}, doi = {10.1093/jmammal/gyy173}, pmid = {31138949}, issn = {0022-2372}, abstract = {Analysis of variation in whole-animal performance can shed light on causal connections between specific traits, integrated physiological capacities, and Darwinian fitness. Here, we review and synthesize information on naturally occurring variation in physiological performance capacities and how it relates to environmental adaptation in deer mice (Peromyscus maniculatus). We discuss how evolved changes in aerobic exercise capacity and thermogenic capacity have contributed to adaptation to high elevations. Comparative work on deer mice at high and low elevations has revealed evolved differences in aerobic performance capacities in hypoxia. Highland deer mice have consistently higher aerobic performance capacities under hypoxia relative to lowland natives, consistent with the idea that it is beneficial to have a higher maximal metabolic rate (as measured by the maximal rate of O2 consumption, VO2max) in an environment characterized by lower air temperatures and lower O2 availability. Observed differences in aerobic performance capacities between highland and lowland deer mice stem from changes in numerous subordinate traits that alter the flux capacity of the O2-transport system, the oxidative capacity of tissue mitochondria, and the relationship between O2 consumption and ATP synthesis. Many such changes in physiological phenotype are associated with hypoxia-induced changes in gene expression. Research on natural variation in whole-animal performance forms a nexus between physiological ecology and evolutionary biology that requires insight into the natural history of the study species.}, }
@article {pmid30586649, year = {2019}, author = {Bartáková, V and Bryja, J and Šanda, R and Bektas, Y and Stefanov, T and Choleva, L and Smith, C and Reichard, M}, title = {High cryptic diversity of bitterling fish in the southern West Palearctic.}, journal = {Molecular phylogenetics and evolution}, volume = {133}, number = {}, pages = {1-11}, doi = {10.1016/j.ympev.2018.12.025}, pmid = {30586649}, issn = {1095-9513}, mesh = {Animals ; Asia, Western ; Biodiversity ; Cyprinidae/*classification/genetics ; Cytochromes b/genetics ; DNA, Mitochondrial/chemistry ; Demography ; Europe ; Genetic Drift ; Genetic Variation ; Genotype ; Microsatellite Repeats ; Mitochondria/genetics ; Phylogeny ; }, abstract = {South-east Europe, along with the adjacent region of south-west Asia, is an important biodiversity hotspot with high local endemism largely contributed by contemporary continental lineages that retreated to southern refugia during colder Quaternary periods. We investigated the genetic diversity of the European bitterling fish (Rhodeus amarus) species complex (Cyprinidae) across its range in the western Palearctic, but with a particular emphasis in the region of Balkan, Pontic and Caspian refugia. We genotyped 12 polymorphic microsatellite loci and a partial sequence of mitochondrial gene cytochrome b (CYTB) for a set of 1,038 individuals from 60 populations. We used mtDNA sequences to infer phylogenetic relationships and historical demography, and microsatellite markers to describe fine-scale genetic variability and structure. Our mtDNA analysis revealed six well-supported lineages, with limited local co-occurrence. Two lineages are distributed throughout central and western Europe (lineages &quot;A&quot; and &quot;B&quot;), with two zones of secondary contact. Another two lineages were restricted to the Ponto-Aegean region of Greece (lineages &quot;C&quot; and &quot;D&quot;) and the final two lineages were restricted south of the Caucasus mountains (lineage &quot;E&quot; from the Black Sea watershed and lineage &quot;F&quot; from the Caspian watershed). A signal of recent expansion was revealed in the two widespread lineages and the Ponto-Aegean lineage &quot;C&quot;. The geographic distribution of clusters detected by nuclear microsatellites corresponded well with mitochondrial lineages and demonstrated finely sub-structured populations. A profound population structure suggested a significant role of genetic drift in differentiation among lineages. Lineage divergence in the Ponto-Aegean and Caspian regions are substantial, supporting the validity of two described endemic species (Rhodeus meridionalis as lineage &quot;D&quot; and Rhodeus colchicus as lineage &quot;E&quot;) and invite taxonomic evaluation of the other two southern lineages (Thracean &quot;C&quot; and Caspian &quot;F&quot;).}, }
@article {pmid30583042, year = {2019}, author = {Elias-Costa, AJ and Confalonieri, VA and Lanteri, AA and Rodriguero, MS}, title = {Game of clones: Is Wolbachia inducing speciation in a weevil with a mixed reproductive mode?.}, journal = {Molecular phylogenetics and evolution}, volume = {133}, number = {}, pages = {42-53}, doi = {10.1016/j.ympev.2018.12.027}, pmid = {30583042}, issn = {1095-9513}, mesh = {Animals ; Argentina ; Biological Evolution ; Brazil ; Cell Nucleus/genetics ; Female ; Genetic Speciation ; Male ; Mitochondria/genetics ; *Parthenogenesis ; Reproduction ; Weevils/classification/genetics/*microbiology/*physiology ; Wolbachia/*physiology ; }, abstract = {Parthenogenesis is widely distributed in Metazoa but it is especially frequent in weevils (Coleoptera, Curculionidae) with one fifth of all known cases. Previous studies have shown that in the tribe Naupactini parthenogenetic reproduction most likely originated with an infection of the endoparasitic bacterium Wolbachia pipientis. In particular, Pantomorus postfasciatus possess a mixed reproductive mode: some populations have males while in others they are absent, and females produce clones by thelytoky. To better understand this scenario, we studied the population structure and infection status in 64 individuals of P. postfasciatus from Argentina and Brazil. We sequenced two mitochondrial (COI and COII) and one nuclear (ITS-1) fragments and obtained two very divergent haplogroups, one corresponding to the sexual populations uninfected with Wolbachia, and another conforming a monophyletic parthenogenetic (or presumptively parthenogenetic) and infected clade. Each of these haplogroups was identified as an independently evolutionary unit by all species delimitation analyses accomplished: multilocus *BEAST and BP&amp;P, and single locus GMYC and K/θ rule. Additionally, present evidence suggests that Wolbachia infection occurred at least twice in all-female populations of P. postfasciatus with two different bacterial strains. Speciation mediated by Wolbachia is a recently described phenomenon and the case of P. postfasciatus is the first known case in a diplo-diploid insect. A model that describes how thelytoky-inducing phenotypes of Wolbachia could generate new lineages is discussed.}, }
@article {pmid31105043, year = {2019}, author = {Dumesic, PA and Egan, DF and Gut, P and Tran, MT and Parisi, A and Chatterjee, N and Jedrychowski, M and Paschini, M and Kazak, L and Wilensky, SE and Dou, F and Bogoslavski, D and Cartier, JA and Perrimon, N and Kajimura, S and Parikh, SM and Spiegelman, BM}, title = {An Evolutionarily Conserved uORF Regulates PGC1α and Oxidative Metabolism in Mice, Flies, and Bluefin Tuna.}, journal = {Cell metabolism}, volume = {}, number = {}, pages = {}, doi = {10.1016/j.cmet.2019.04.013}, pmid = {31105043}, issn = {1932-7420}, abstract = {Mitochondrial abundance and function are tightly controlled during metabolic adaptation but dysregulated in pathological states such as diabetes, neurodegeneration, cancer, and kidney disease. We show here that translation of PGC1α, a key governor of mitochondrial biogenesis and oxidative metabolism, is negatively regulated by an upstream open reading frame (uORF) in the 5' untranslated region of its gene (PPARGC1A). We find that uORF-mediated translational repression is a feature of PPARGC1A orthologs from human to fly. Strikingly, whereas multiple inhibitory uORFs are broadly present in fish PPARGC1A orthologs, they are completely absent in the Atlantic bluefin tuna, an animal with exceptionally high mitochondrial content. In mice, an engineered mutation disrupting the PPARGC1A uORF increases PGC1α protein levels and oxidative metabolism and confers protection from acute kidney injury. These studies identify a translational regulatory element governing oxidative metabolism and highlight its potential contribution to the evolution of organismal mitochondrial function.}, }
@article {pmid30057120, year = {2018}, author = {Zhang, Q and Wu, X and Chen, P and Liu, L and Xin, N and Tian, Y and Dillin, A}, title = {The Mitochondrial Unfolded Protein Response Is Mediated Cell-Non-autonomously by Retromer-Dependent Wnt Signaling.}, journal = {Cell}, volume = {174}, number = {4}, pages = {870-883.e17}, pmid = {30057120}, issn = {1097-4172}, support = {P40 OD010440/OD/NIH HHS/United States ; R01 ES021667/ES/NIEHS NIH HHS/United States ; R37 AG024365/AG/NIA NIH HHS/United States ; /HHMI/Howard Hughes Medical Institute/United States ; }, mesh = {Animals ; Animals, Genetically Modified/genetics/growth &amp; development/*metabolism ; Caenorhabditis elegans/genetics/growth &amp; development/*metabolism ; Caenorhabditis elegans Proteins/genetics/*metabolism ; Carrier Proteins/genetics/metabolism ; Glycoproteins/genetics/metabolism ; Mitochondria/genetics/*metabolism ; Neurons/cytology/metabolism ; Polyubiquitin/*metabolism ; Unfolded Protein Response/*physiology ; Vesicular Transport Proteins/genetics/metabolism ; Wnt Proteins/genetics/*metabolism ; }, abstract = {The mitochondrial unfolded protein response (UPRmt) can be triggered in a cell-non-autonomous fashion across multiple tissues in response to mitochondrial dysfunction. The ability to communicate information about the presence of mitochondrial stress enables a global response that can ultimately better protect an organism from local mitochondrial challenges. We find that animals use retromer-dependent Wnt signaling to propagate mitochondrial stress signals from the nervous system to peripheral tissues. Specifically, the polyQ40-triggered activation of mitochondrial stress or reduction of cco-1 (complex IV subunit) in neurons of C. elegans results in the Wnt-dependent induction of cell-non-autonomous UPRmt in peripheral cells. Loss-of-function mutations of retromer complex components that are responsible for recycling the Wnt secretion-factor/MIG-14 prevent Wnt secretion and thereby suppress cell-non-autonomous UPRmt. Neuronal expression of the Wnt ligand/EGL-20 is sufficient to induce cell-non-autonomous UPRmt in a retromer complex-, Wnt signaling-, and serotonin-dependent manner, clearly implicating Wnt signaling as a strong candidate for the &quot;mitokine&quot; signal.}, }
@article {pmid28883650, year = {2017}, author = {Liu, M and Guo, X}, title = {A novel and stress adaptive alternative oxidase derived from alternative splicing of duplicated exon in oyster Crassostrea virginica.}, journal = {Scientific reports}, volume = {7}, number = {1}, pages = {10785}, pmid = {28883650}, issn = {2045-2322}, mesh = {*Alternative Splicing ; Animals ; Crassostrea/genetics/*physiology ; *Exons ; Gene Expression Regulation ; Mitochondria/metabolism ; Mitochondrial Proteins/*genetics/*metabolism ; Models, Biological ; Oxidoreductases/*genetics/*metabolism ; Phylogeny ; Plant Proteins/*genetics/*metabolism ; *Stress, Physiological ; }, abstract = {Alternative oxidase (AOX) is a mitochondrial inner-membrane oxidase that accepts electrons directly from ubiquinol and reduces oxygen to water without involving cytochrome-linked electron transport chain. It is highly conserved in many non-vertebrate taxa and may protect cells against hypoxia and oxidative stress. We identified two AOX mRNAs in eastern oyster Crassostrea virginica, CvAOXA and CvAOXB, which differ by 170 bp but encode AOXs of the same size. Sequence analyses indicate that CvAOX has 10 exons with a tandem duplication of exon 10, and 3' alternative splicing using either the first or second exon 10 produces the two variants CvAOXB or CvAOXA, respectively. The second exon 10 in CvAOXA is more conserved across taxa, while the first exon 10 in CvAOXB contains novel mutations surrounding key functional sites. Both variants are expressed in all organs with the expression of CvAOXA higher than that of CvAOXB under normal condition. Under stress by air exposure, CvAOXB showed significantly higher expression than CvAOXA and became the dominant variant. This is the first case of alternative splicing of duplicated exon in a mollusc that produces a novel variant adaptive to stress, highlighting genome's versatility in generating diversity and phenotypic plasticity.}, }
@article {pmid31092607, year = {2019}, author = {Tian, R and Seim, I and Ren, W and Xu, S and Yang, G}, title = {Contraction of the ROS Scavenging Enzyme Glutathione S-transferase Gene Family in Cetaceans.}, journal = {G3 (Bethesda, Md.)}, volume = {}, number = {}, pages = {}, doi = {10.1534/g3.119.400224}, pmid = {31092607}, issn = {2160-1836}, abstract = {Cetaceans are a group of marine mammals whose ancestors were adaptated for life on land. Life in an aquatic environment poses many challenges for air-breathing mammals. Diving marine mammals have adapted to rapid reoxygenation and reactive oxygen species (ROS)-mediated reperfusion injury. Here, we considered the evolution of the glutathione transferase (GST) gene family which has important roles in the detoxification of endogenously-derived ROS and environmental pollutants. We characterized the cytosolic GST gene family in 21 mammalian species; cetaceans, sirenians, pinnipeds, and their terrestrial relatives. All seven GST classes were identified, showing that GSTs are ubiquitous in mammals. Some GST genes are the product of lineage-specific duplications and losses, in line with a birth-and-death evolutionary model. We detected sites with signatures of positive selection that possibly influence GST structure and function, suggesting that adaptive evolution of GST genes is important for defending mammals from various types of noxious environmental compounds. We also found evidence for loss of alpha and mu GST subclass genes in cetacean lineages. Notably, cetaceans have retained a homolog of at least one of the genes GSTA1, GSTA4, and GSTM1; GSTs that are present in both the cytosol and mitochondria. The observed variation in number and selection pressure on GST genes suggest that the gene family structure is dynamic within cetaceans.}, }
@article {pmid31089666, year = {2018}, author = {Balzan, S and Cazzolla Gatti, R}, title = {endogenosymbiosis: from hypothesis to empirical evidence towards a Unified Symbiogenetic Theory (UST).}, journal = {Theoretical biology forum}, volume = {111}, number = {1-2}, pages = {13-26}, doi = {10.19272/201811402002}, pmid = {31089666}, issn = {0035-6050}, abstract = {In 1967 Lynn (Sagan) Margulis proposed that mitochondria, photosynthetic plastids and cilia were acquired prokaryotes and evolved symbiotically to form anaerobic bacteria, photosynthetic bacteria and eventually algae. Although most of this theory is well-accepted now, the hypothesis that endosymbiotic spirochaetes developed into eukaryotic flagella and cilia, and the following proposals of an endosymbiotic origin of other eukaryotic organelles such as peroxisomes, glyoxysomes, etc. have not received much acceptance, since evidence suggests they lack a genome and do not show ultrastructural similarities to bacteria or archaea. Nevertheless, the idea that over millennia mitochondria, plastids, prokaryotic and eukaryotic cells and even flagella and peroxisomes, as either primary or secondary endosymbionts, transferred some or all of their own DNA to the host cell’s nucleus through a process called «endogenosymbiosis» (i.e. a symbiotic gene transfer, such as the internalisation of the endosymbiont’s DNA with lateral transfer) has been recently suggested. This endogenosymbiosis could take place during the evolutionary transition from the symbiotic interacting community, invoked by Margulis, to a fully-integrated (either prokaryotic or eukaryotic) cell. This process could explain the missing evidence of the presence of DNA in flagella and peroxisomes whose ancestor endosymbionts, during the long endogenosymbiotic evolution, could have transferred their whole genome to the host cell that subsequently integrated it in its own genome, directly controlling its expression. Furthermore, the endogenosymbiosis hypothesis could be the explanation of the transition between an RNA to a DNA world and of some cases of true sympatric evolution of species, apparently inexplicable by the canonical speciation processes. Here, after an introduction to the theoretical basis of endogenosymbiosis and a discussion of the empirical confirming evidence, I show a graphical summary of the integration between this and the former endosymbiosis theories. The Serial Endosymbiosis Theory and the Secondary Endosymbiosis are merged with the Endogenosymbiosis Theory in a Unified Symbiogenetic Theory (UST).}, }
@article {pmid30550962, year = {2019}, author = {Feng, C and Zhou, W and Tang, Y and Gao, Y and Chen, J and Tong, C and Liu, S and Wanghe, K and Zhao, K}, title = {Molecular systematics of the Triplophysa robusta (Cobitoidea) complex: Extensive gene flow in a depauperate lineage.}, journal = {Molecular phylogenetics and evolution}, volume = {132}, number = {}, pages = {275-283}, doi = {10.1016/j.ympev.2018.12.009}, pmid = {30550962}, issn = {1095-9513}, mesh = {Animals ; Bayes Theorem ; Biological Evolution ; Cypriniformes/*classification/genetics ; Cytochromes b/classification/genetics ; *Gene Flow ; Genetics, Population ; Haplotypes ; Mitochondria/genetics ; Phylogeny ; RNA, Ribosomal, 16S/classification/genetics ; }, abstract = {Gene flow between populations assumed to be isolated frequently leads to incorrect inferences of evolutionary history. Understanding gene flow and its causes has long been a key topic in evolutionary biology. In this study, we explored the evolutionary history of the Triplophysa robusta complex, using a combination of multilocus analyses and coalescent simulation. Our multilocus approach detected conspicuous mitonuclear discordances in the T. robusta complex. Mitochondrial results showed reticular clades, whereas the nuclear results corresponded with the morphological data. Coalescent simulation indicated that gene flow was the source of these discordances. Molecular clock analysis combined with geological processes suggest that intense geological upheavals have shaped a complicated evolutionary history for the T. robusta complex since the late Miocene, causing extensive gene flow which has distorted the molecular systematics of the T. robusta complex. We suggest that frequent gene flow may restrict speciation in the T. robusta complex, leading to such a depauperate lineage. Based on this comprehensive understanding, we provide our proposals for taxonomic revision of the T. robusta complex.}, }
@article {pmid30529551, year = {2019}, author = {Liu, J and Yu, J and Zhou, M and Yang, J}, title = {Complete mitochondrial genome of Japalura flaviceps: Deep insights into the phylogeny and gene rearrangements of Agamidae species.}, journal = {International journal of biological macromolecules}, volume = {125}, number = {}, pages = {423-431}, doi = {10.1016/j.ijbiomac.2018.12.068}, pmid = {30529551}, issn = {1879-0003}, mesh = {Animals ; DNA, Mitochondrial/genetics ; Gene Rearrangement/*genetics ; Genome, Mitochondrial/*genetics ; Lizards/*genetics ; Mitochondria/*genetics ; Phylogeny ; RNA, Transfer/genetics ; Reptiles/*genetics ; }, abstract = {Japalura flaviceps is a subarboreal species, which is endemically distributed in China. Here, we determined the complete mitogenome of J. flaviceps. This mitogenome was a typical circular molecule of 17,140 bp in size, containing 13 protein-coding genes, 22 transfer-RNA-coding genes, two ribosomal-RNA-coding genes, and one control region. Our phylogenetic result using 15 genes divided all Agamidae lizards into six subfamilies and showed (((((Agaminae, Draconinae), Amphibolurinae), Hydrosaurinae), Uromastycinae), Leiolepinae), which was different from the previous studies. J. flaviceps had a closer relationship to Pseudocalotes species than Acanthosaura species, and they formed a well-supported lineage of Draconinae subfamily. There were nine mitochondrial gene rearrangement types among the 27 Agamidae species, and six of them were found in the Agaminae group. The trnP gene of J. flaviceps mitogenome was encoded on the heavy strand instead of its typical light strand position, providing an example of gene inversion in vertebrate mitogenomes. J. flaviceps shared the same gene arrangement type (inverted trnP gene) with other Draconinae species, strongly implying a single occurrence of the trnP inversion in the ancestral draconine lineage. Our study helps to understand mitogenome evolution and phylogenetic relationship of Agamidae species.}, }
@article {pmid30528084, year = {2019}, author = {Przyboś, E and Rautian, M and Beliavskaia, A and Tarcz, S}, title = {Evaluation of the molecular variability and characteristics of Paramecium polycaryum and Paramecium nephridiatum, within subgenus Cypriostomum (Ciliophora, Protista).}, journal = {Molecular phylogenetics and evolution}, volume = {132}, number = {}, pages = {296-306}, doi = {10.1016/j.ympev.2018.12.003}, pmid = {30528084}, issn = {1095-9513}, mesh = {Bayes Theorem ; DNA, Mitochondrial/genetics/metabolism ; Electron Transport Complex IV/classification/genetics ; Haplotypes ; Likelihood Functions ; Mitochondria/genetics ; Paramecium/*classification ; Phylogeny ; }, abstract = {Although some Paramecium species are suitable research objects in many areas of life sciences, the biodiversity structure of other species is almost unknown. In the current survey, we present a molecular analysis of 60 Cypriostomum strains, which for the first time allows for the study of intra- and interspecific relationships within that subgenus, as well as the assessment of the biogeography patterns of its morphospecies. Analysis of COI mtDNA variation revealed three main clades (separated from each other by approximately 130 nucleotide substitutions), each one with internal sub-clusters (differing by 30 to 70 substitutions - a similar range found between P. aurelia cryptic species and P. bursaria syngens). The first clade is represented exclusively by P. polycaryum; the second one includes only four strains identified as P. calkinsi. The third cluster seems to be paraphyletic, as it includes P. nephridiatum, P. woodruffi, and Eucandidatus P. hungarianum. Some strains, previously identified as P. calkinsi, had COI sequences identical or very similar to P. nephridiatum ones. Morphological reinvestigation of several such strains revealed common morphological features with P. nephridiatum. The paper contains new information concerning speciation within particular species, i.e. existence of cryptic species within P. polycaryum (three) and in P. nephridiatum (six).}, }
@article {pmid30496844, year = {2019}, author = {Boubli, JP and Byrne, H and da Silva, MNF and Silva-Júnior, J and Costa Araújo, R and Bertuol, F and Gonçalves, J and de Melo, FR and Rylands, AB and Mittermeier, RA and Silva, FE and Nash, SD and Canale, G and Alencar, RM and Rossi, RV and Carneiro, J and Sampaio, I and Farias, IP and Schneider, H and Hrbek, T}, title = {On a new species of titi monkey (Primates: Plecturocebus Byrne et al., 2016), from Alta Floresta, southern Amazon, Brazil.}, journal = {Molecular phylogenetics and evolution}, volume = {132}, number = {}, pages = {117-137}, doi = {10.1016/j.ympev.2018.11.012}, pmid = {30496844}, issn = {1095-9513}, mesh = {Animals ; Bayes Theorem ; Brazil ; Cytochromes b/genetics ; Ecosystem ; Endangered Species ; Genome ; Mitochondria/genetics ; Phylogeny ; Pitheciidae/anatomy &amp; histology/*classification/genetics ; Polymorphism, Single Nucleotide ; }, abstract = {The taxonomy of the titi monkeys (Callicebinae) has recently received considerable attention. It is now recognised that this subfamily is composed of three genera with 33 species, seven of them described since 2002. Here, we describe a new species of titi, Plecturocebus, from the municipality of Alta Floresta, Mato Grosso, Brazil. We adopt an integrative taxonomic approach that includes phylogenomic analyses, pelage characters, and locality records. A reduced representation genome-wide approach was employed to assess phylogenetic relationships among species of the eastern Amazonian clade of the Plecturocebus moloch group. Using existing records, we calculated the Extent of Occurrence (EOO) of the new species and estimated future habitat loss for the region based on predictive models. We then evaluated the species' conservation status using the IUCN Red list categories and criteria. The new species presents a unique combination of morphological characters: (1) grey agouti colouration on the crown and dorsal parts; (2) entirely bright red-brown venter; (3) an almost entirely black tail with a pale tip; and (4) light yellow colouration of the hair on the cheeks contrasting with bright red-brown hair on the sides of the face. Our phylogenetic reconstructions based on maximum-likelihood and Bayesian methods revealed well-supported species relationships, with the Alta Floresta taxon as sister to P. moloch + P. vieirai. The species EOO is 10,166,653 ha and we predict a total habitat loss of 86% of its original forest habitat under a &quot;business as usual&quot; scenario in the next 24 years, making the newly discovered titi monkey a Critically Endangered species under the IUCN A3c criterion. We give the new titi monkey a specific epithet based on: (1) clear monophyly of this lineage revealed by robust genomic and mitochondrial data; (2) distinct and diagnosable pelage morphology; and (3) a well-defined geographical distribution with clear separation from other closely related taxa. Urgent conservation measures are needed to safeguard the future of this newly discovered and already critically endangered primate.}, }
@article {pmid31088635, year = {2019}, author = {Tan, DX}, title = {Aging: An evolutionary competition between host cells and mitochondria.}, journal = {Medical hypotheses}, volume = {127}, number = {}, pages = {120-128}, doi = {10.1016/j.mehy.2019.04.007}, pmid = {31088635}, issn = {1532-2777}, abstract = {Here, a new theory of aging is proposed. This new theory is referred as the Host-Mitochondria Intracellular Innate Immune Theory of Aging (HMIIITA). The main point of this theory is that the aging is rooted from an evolutionary competition, that is, a never ending coevolutionary race between host cells and mitochondria. Mitochondria are the descendants of bacteria. The host cells will inevitably sense their bacterial origin, particularly their circular mtDNA. The host intracellular innate immune pressure (HIIIP) aims to eliminate mtDNA as more as possible while mitochondria have to adapt the HIIIP for survival. Co-evolution is required for both of them. From biological point of view, the larger, the mtDNA, the higher, the chance, it becomes the target of HIIIP. As a result, mitochondria have to reduce their mtDNA size via deletion. This process has last for 1.5-2 billion yeas and the result is that mitochondria have lost excessive 95% of their DNA. This mtDNA deletion is not associated with free radical attack but a unique trait acquired during evolution. In the postmitotic cells, the deletion is passively selected by the mitochondrial fission-fusion cycles. Eventually, the accumulation of deletion will significantly jeopardize the mitochondrial function. The dysfunctional mitochondria no longer provide sufficient ATP to support host cells' continuous demanding for growth. At this stage, the cell or the organism aging is inevitable.}, }
@article {pmid31088494, year = {2019}, author = {Shah, A and Hoffman, JI and Schielzeth, H}, title = {Transcriptome assembly for a colour-polymorphic grasshopper (Gomphocerus sibiricus) with a very large genome size.}, journal = {BMC genomics}, volume = {20}, number = {1}, pages = {370}, doi = {10.1186/s12864-019-5756-4}, pmid = {31088494}, issn = {1471-2164}, support = {SCHI 1188/1-1//Deutsche Forschungsgemeinschaft/ ; }, abstract = {BACKGROUND: The club-legged grasshopper Gomphocerus sibiricus is a Gomphocerinae grasshopper with a promising future as model species for studying the maintenance of colour-polymorphism, the genetics of sexual ornamentation and genome size evolution. However, limited molecular resources are available for this species. Here, we present a de novo transcriptome assembly as reference resource for gene expression studies. We used high-throughput Illumina sequencing to generate 5,070,036 paired-end reads after quality filtering. We then combined the best-assembled contigs from three different de novo transcriptome assemblers (Trinity, SOAPdenovo-trans and Oases/Velvet) into a single assembly.<br><br>RESULTS: This resulted in 82,251 contigs with a N50 of 1357 and a TransRate assembly score of 0.325, which compares favourably with other orthopteran transcriptome assemblies. Around 87% of the transcripts could be annotated using InterProScan 5, BLASTx and the dammit! annotation pipeline. We identified a number of genes involved in pigmentation and green pigment metabolism pathways. Furthermore, we identified 76,221 putative single nucleotide polymorphisms residing in 8400 contigs. We also assembled the mitochondrial genome and investigated levels of sequence divergence with other species from the genus Gomphocerus. Finally, we detected and assembled Wolbachia sequences, which revealed close sequence similarity to the strain pel wPip.<br><br>CONCLUSIONS: Our study has generated a significant resource for uncovering genotype-phenotype associations in a species with an extraordinarily large genome, while also providing mitochondrial and Wolbachia sequences that will be useful for comparative studies.}, }
@article {pmid31076245, year = {2019}, author = {Brunk, CF and Martin, WF}, title = {Archaeal Histone Contributions to the Origin of Eukaryotes.}, journal = {Trends in microbiology}, volume = {}, number = {}, pages = {}, doi = {10.1016/j.tim.2019.04.002}, pmid = {31076245}, issn = {1878-4380}, abstract = {The eukaryotic lineage arose from bacterial and archaeal cells that underwent a symbiotic merger. At the origin of the eukaryote lineage, the bacterial partner contributed genes, metabolic energy, and the building blocks of the endomembrane system. What did the archaeal partner donate that made the eukaryotic experiment a success? The archaeal partner provided the potential for complex information processing. Archaeal histones were crucial in that regard by providing the basic functional unit with which eukaryotes organize DNA into nucleosomes, exert epigenetic control of gene expression, transcribe genes with CCAAT-box promoters, and a manifest cell cycle with condensed chromosomes. While mitochondrial energy lifted energetic constraints on eukaryotic protein production, histone-based chromatin organization paved the path to eukaryotic genome complexity, a critical hurdle en route to the evolution of complex cells.}, }
@article {pmid31073215, year = {2019}, author = {Castelli, M and Sabaneyeva, E and Lanzoni, O and Lebedeva, N and Floriano, AM and Gaiarsa, S and Benken, K and Modeo, L and Bandi, C and Potekhin, A and Sassera, D and Petroni, G}, title = {Deianiraea, an extracellular bacterium associated with the ciliate Paramecium, suggests an alternative scenario for the evolution of Rickettsiales.}, journal = {The ISME journal}, volume = {}, number = {}, pages = {}, doi = {10.1038/s41396-019-0433-9}, pmid = {31073215}, issn = {1751-7370}, support = {FP7-PEOPLE-2009-IRSES grant 247658//European Commission (EC)/ ; 16-14-10157//Russian Science Foundation (RSF)/ ; RGY0075/2017//Human Frontier Science Program (HFSP)/ ; }, abstract = {Rickettsiales are a lineage of obligate intracellular Alphaproteobacteria, encompassing important human pathogens, manipulators of host reproduction, and mutualists. Here we report the discovery of a novel Rickettsiales bacterium associated with Paramecium, displaying a unique extracellular lifestyle, including the ability to replicate outside host cells. Genomic analyses show that the bacterium possesses a higher capability to synthesise amino acids, compared to all investigated Rickettsiales. Considering these observations, phylogenetic and phylogenomic reconstructions, and re-evaluating the different means of interaction of Rickettsiales bacteria with eukaryotic cells, we propose an alternative scenario for the evolution of intracellularity in Rickettsiales. According to our reconstruction, the Rickettsiales ancestor would have been an extracellular and metabolically versatile bacterium, while obligate intracellularity would have evolved later, in parallel and independently, in different sub-lineages. The proposed new scenario could impact on the open debate on the lifestyle of the last common ancestor of mitochondria within Alphaproteobacteria.}, }
@article {pmid30854666, year = {2019}, author = {Wang, W and Chen, J and Liao, B and Xia, L and Hou, S and Wang, Z and Lu, Y}, title = {Identification and functional characterization of Histone-like DNA-binding protein in Nocardia seriolae (NsHLP) involved in cell apoptosis.}, journal = {Journal of fish diseases}, volume = {42}, number = {5}, pages = {657-666}, doi = {10.1111/jfd.12962}, pmid = {30854666}, issn = {1365-2761}, support = {KY20160207//Shenzhen Dapeng New District special fund for industry development/ ; 2016A050502061//International S&amp;T Cooperation Projects of Guangdong Province/ ; JCYJ20170306161613251//Shenzhen Science and Technology Project/ ; 2017A030313179//Natural Science Foundation of Guangdong Province/ ; C17377//Natural Science Foundation of Guangdong Ocean University/ ; C13454//Natural Science Foundation of Guangdong Ocean University/ ; E10085//Natural Science Foundation of Guangdong Ocean University/ ; }, mesh = {Amino Acid Sequence ; Animals ; *Apoptosis ; Bacterial Proteins/chemistry/*genetics/metabolism ; Base Sequence ; *Cyprinidae ; DNA-Binding Proteins/chemistry/*genetics/metabolism ; Fish Diseases/microbiology/*physiopathology ; Nocardia/genetics/*physiology ; Nocardia Infections/microbiology/physiopathology/*veterinary ; Phylogeny ; Sequence Alignment/veterinary ; }, abstract = {Nocardia seriolae, a facultative intracellular bacterium, is the main pathogen of fish nocardiosis. Bioinformatic analysis showed that the histone-like DNA-binding protein (HLP) gene of N. seriolae (nshlp) encoded a secreted protein and might target the mitochondria in the host cell. To further study the preliminary function of HLP in N. seriolae (NsHLP), the gene cloning, extracellular products identification, subcellular localization, overexpression and apoptosis detection assay were carried out in this study. Mass spectrometry analysis of the extracellular products from N. seriolae showed that NsHLP was a secreted protein. Subcellular localization of HLP-GFP fusion proteins mainly assembled in the nucleus, which indicated that the NsHLP was co-located with the nucleus rather than mitochondria in fathead minnow (FHM) cells. Notably, the expression of NsHLP had changed the distribution of mitochondria into lumps in the FHM cell. In addition, apoptotic features were found in the transfected FHM cells by overexpression of NsHLP. Quantitative assays of mitochondrial membrane potential value, caspase-3 activity and pro-apoptotic genes mRNA (Bad, Bid and Bax) expression level demonstrated that the cell apoptosis was induced in the transfected FHM cells. All the results presented in this study provided insight on the function of NsHLP, which suggested that it may participate in the cell apoptosis regulation and play an important role in the pathogenesis of N. seriolae.}, }
@article {pmid31064825, year = {2019}, author = {Bertolini, MS and Chiurillo, MA and Lander, N and Vercesi, AE and Docampo, R}, title = {MICU1 and MICU2 Play an Essential Role in Mitochondrial Ca2+ Uptake, Growth, and Infectivity of the Human Pathogen Trypanosoma cruzi.}, journal = {mBio}, volume = {10}, number = {3}, pages = {}, doi = {10.1128/mBio.00348-19}, pmid = {31064825}, issn = {2150-7511}, abstract = {The mitochondrial Ca2+ uptake in trypanosomatids, which belong to the eukaryotic supergroup Excavata, shares biochemical characteristics with that of animals, which, together with fungi, belong to the supergroup Opisthokonta. However, the composition of the mitochondrial calcium uniporter (MCU) complex in trypanosomatids is quite peculiar, suggesting lineage-specific adaptations. In this work, we used Trypanosoma cruzi to study the role of orthologs for mitochondrial calcium uptake 1 (MICU1) and MICU2 in mitochondrial Ca2+ uptake. T. cruzi MICU1 (TcMICU1) and TcMICU2 have mitochondrial targeting signals, two canonical EF-hand calcium-binding domains, and localize to the mitochondria. Using the CRISPR/Cas9 system (i.e., clustered regularly interspaced short palindromic repeats with Cas9), we generated TcMICU1 and TcMICU2 knockout (-KO) cell lines. Ablation of either TcMICU1 or TcMICU2 showed a significantly reduced mitochondrial Ca2+ uptake in permeabilized epimastigotes without dissipation of the mitochondrial membrane potential or effects on the AMP/ATP ratio or citrate synthase activity. However, none of these proteins had a gatekeeper function at low cytosolic Ca2+ concentrations ([Ca2+]cyt), as occurs with their mammalian orthologs. TcMICU1-KO and TcMICU2-KO epimastigotes had a lower growth rate and impaired oxidative metabolism, while infective trypomastigotes have a reduced capacity to invade host cells and to replicate within them as amastigotes. The findings of this work, which is the first to study the role of MICU1 and MICU2 in organisms evolutionarily distant from animals, suggest that, although these components were probably present in the last eukaryotic common ancestor (LECA), they developed different roles during evolution of different eukaryotic supergroups. The work also provides new insights into the adaptations of trypanosomatids to their particular life styles.IMPORTANCETrypanosoma cruzi is the etiologic agent of Chagas disease and belongs to the early-branching eukaryotic supergroup Excavata. Its mitochondrial calcium uniporter (MCU) subunit shares similarity with the animal ortholog that was important to discover its encoding gene. In animal cells, the MICU1 and MICU2 proteins act as Ca2+ sensors and gatekeepers of the MCU, preventing Ca2+ uptake under resting conditions and favoring it at high cytosolic Ca2+ concentrations ([Ca2+]cyt). Using the CRISPR/Cas9 technique, we generated TcMICU1 and TcMICU2 knockout cell lines and showed that MICU1 and -2 do not act as gatekeepers at low [Ca2+]cyt but are essential for normal growth, host cell invasion, and intracellular replication, revealing lineage-specific adaptations.}, }
@article {pmid30586406, year = {2018}, author = {Zhao, L and Lin, XM and Li, F and Li, KR and He, B and Zhang, LY and Pan, JJ and Wang, QR and Gao, JM and Johnson, N and Yuan, XF and Lv, JZ and Wu, SQ and Liu, YH}, title = {A survey of argasid ticks and tick-associated pathogens in the Peripheral Oases around Tarim Basin and the first record of Argas japonicus in Xinjiang, China.}, journal = {PloS one}, volume = {13}, number = {12}, pages = {e0208615}, doi = {10.1371/journal.pone.0208615}, pmid = {30586406}, issn = {1932-6203}, mesh = {Anaplasma/classification/genetics/*isolation &amp; purification/pathogenicity ; Animals ; Argas/classification/genetics/*microbiology ; Cattle ; China ; Disease Vectors ; Mitochondria/genetics ; Ornithodoros/classification/genetics/*microbiology ; Phylogeny ; RNA, Ribosomal/classification/genetics/metabolism ; RNA, Ribosomal, 16S/classification/genetics/metabolism ; Rickettsia/classification/genetics/*isolation &amp; purification/pathogenicity ; Sequence Analysis, DNA ; Sheep ; Tick Infestations/parasitology/pathology/veterinary ; }, abstract = {Argasid ticks (Acari: Argasidae) carry and transmit a variety of pathogens of animals and humans, including viruses, bacteria and parasites. There are several studies reporting ixodid ticks (Acari: Ixodidae) and associated tick-borne pathogens in Xinjiang, China. However, little is known about the argasid ticks and argasid tick-associated pathogens in this area. In this study, a total of 3829 adult argasid ticks infesting livestock were collected at 12 sampling sites of 10 counties in the Peripheral Oases, which carry 90% of the livestock and humans population, around the Tarim Basin (southern Xinjiang) from 2013 to 2016. Tick specimens were identified to two species from different genera by morphology and sequences of mitochondrial 16S rRNA and 12S rRNA were derived to confirm the species designation. The results showed that the dominant argasid ticks infesting livestock in southern Xinjiang were Ornithodoros lahorensis (87.86%, 3364/3829). Ornithodoros lahorensis was distributed widely and were collected from 10 counties of southern Xinjiang. Argas japonicus was collected from Xinjiang for the first time. In addition, we screened these ticks for tick-associated pathogens and showed the presence of DNA sequences of Rickettsia spp. of Spotted fever group and Anaplasma spp. in the argasid ticks. This finding suggests the potential role for Argas japonicus as a vector of pathogens to livestock and humans.}, }
@article {pmid31057485, year = {2019}, author = {Zhao, D and Yu, Y and Shen, Y and Liu, Q and Zhao, Z and Sharma, R and Reiter, RJ}, title = {Melatonin Synthesis and Function: Evolutionary History in Animals and Plants.}, journal = {Frontiers in endocrinology}, volume = {10}, number = {}, pages = {249}, doi = {10.3389/fendo.2019.00249}, pmid = {31057485}, issn = {1664-2392}, abstract = {Melatonin is an ancient molecule that can be traced back to the origin of life. Melatonin's initial function was likely that as a free radical scavenger. Melatonin presumably evolved in bacteria; it has been measured in both α-proteobacteria and in photosynthetic cyanobacteria. In early evolution, bacteria were phagocytosed by primitive eukaryotes for their nutrient value. According to the endosymbiotic theory, the ingested bacteria eventually developed a symbiotic association with their host eukaryotes. The ingested α-proteobacteria evolved into mitochondria while cyanobacteria became chloroplasts and both organelles retained their ability to produce melatonin. Since these organelles have persisted to the present day, all species that ever existed or currently exist may have or may continue to synthesize melatonin in their mitochondria (animals and plants) and chloroplasts (plants) where it functions as an antioxidant. Melatonin's other functions, including its multiple receptors, developed later in evolution. In present day animals, via receptor-mediated means, melatonin functions in the regulation of sleep, modulation of circadian rhythms, enhancement of immunity, as a multifunctional oncostatic agent, etc., while retaining its ability to reduce oxidative stress by processes that are, in part, receptor-independent. In plants, melatonin continues to function in reducing oxidative stress as well as in promoting seed germination and growth, improving stress resistance, stimulating the immune system and modulating circadian rhythms; a single melatonin receptor has been identified in land plants where it controls stomatal closure on leaves. The melatonin synthetic pathway varies somewhat between plants and animals. The amino acid, tryptophan, is the necessary precursor of melatonin in all taxa. In animals, tryptophan is initially hydroxylated to 5-hydroxytryptophan which is then decarboxylated with the formation of serotonin. Serotonin is either acetylated to N-acetylserotonin or it is methylated to form 5-methoxytryptamine; these products are either methylated or acetylated, respectively, to produce melatonin. In plants, tryptophan is first decarboxylated to tryptamine which is then hydroxylated to form serotonin.}, }
@article {pmid30005062, year = {2018}, author = {Salunke, R and Mourier, T and Banerjee, M and Pain, A and Shanmugam, D}, title = {Highly diverged novel subunit composition of apicomplexan F-type ATP synthase identified from Toxoplasma gondii.}, journal = {PLoS biology}, volume = {16}, number = {7}, pages = {e2006128}, pmid = {30005062}, issn = {1545-7885}, mesh = {Amino Acid Sequence ; Animals ; Conserved Sequence ; Gene Expression Regulation ; Genetic Variation ; Hemagglutinins/metabolism ; Mitochondria/metabolism ; Mitochondrial Proton-Translocating ATPases/*metabolism ; Parasites/metabolism ; Phylogeny ; Plasmodium falciparum/metabolism ; Protein Multimerization ; Protein Subunits/*metabolism ; Proteome/metabolism ; Proteomics ; Protozoan Proteins/chemistry/isolation &amp; purification/metabolism ; Recombinant Fusion Proteins/metabolism ; Toxoplasma/*enzymology ; }, abstract = {The mitochondrial F-type ATP synthase, a multisubunit nanomotor, is critical for maintaining cellular ATP levels. In T. gondii and other apicomplexan parasites, many subunit components necessary for proper assembly and functioning of this enzyme appear to be missing. Here, we report the identification of 20 novel subunits of T. gondii F-type ATP synthase from mass spectrometry analysis of partially purified monomeric (approximately 600 kDa) and dimeric (>1 MDa) forms of the enzyme. Despite extreme sequence diversification, key FO subunits a, b, and d can be identified from conserved structural features. Orthologs for these proteins are restricted to apicomplexan, chromerid, and dinoflagellate species. Interestingly, their absence in ciliates indicates a major diversion, with respect to subunit composition of this enzyme, within the alveolate clade. Discovery of these highly diversified novel components of the apicomplexan F-type ATP synthase complex could facilitate the development of novel antiparasitic agents. Structural and functional characterization of this unusual enzyme complex will advance our fundamental understanding of energy metabolism in apicomplexan species.}, }
@article {pmid29405334, year = {2018}, author = {Hill, GE}, title = {Mitonuclear Mate Choice: A Missing Component of Sexual Selection Theory?.}, journal = {BioEssays : news and reviews in molecular, cellular and developmental biology}, volume = {40}, number = {3}, pages = {}, doi = {10.1002/bies.201700191}, pmid = {29405334}, issn = {1521-1878}, mesh = {Animals ; Cell Nucleus/*genetics/metabolism ; Ducks ; Evolution, Molecular ; Female ; Finches ; *Genome, Mitochondrial ; Genotype ; Male ; Mating Preference, Animal/*physiology ; Mitochondria/*genetics/metabolism ; Models, Biological ; *Oxidative Phosphorylation ; Reproduction ; *Selection, Genetic ; Spheniscidae ; }, abstract = {The fitness of a eukaryote hinges on the coordinated function of the products of its nuclear and mitochondrial genomes in achieving oxidative phosphorylation (OXPHOS). I propose that sexual selection plays a key role in the maintenance of mitonuclear coadaptation across generations because it enables pre-zygotic sorting for coadapted mitonuclear genotypes. At each new generation, sexual reproduction creates new combinations of nuclear and mitochondrial genes, and the potential arises for mitonuclear incompatibilities and reduced fitness. In reviewing the literature, I hypothesize that individuals engaged in mate choice select partners with correct species-typical mitochondrial and nuclear genotypes as well as individuals with highly functional cellular respiration. The implication is that mate choice for compatible nuclear and mitochondrial genes can play a significant role in generating the patterns of ornamentation and preferences observed in animals. A number of testable predictions emerge from this mitonuclear compatibility hypothesis of sexual selection.}, }
@article {pmid31044222, year = {2019}, author = {Nagarajan-Radha, V and Rapkin, J and Hunt, J and Dowling, DK}, title = {Interactions between mitochondrial haplotype and dietary macronutrient ratios confer sex-specific effects on longevity in Drosophila melanogaster.}, journal = {The journals of gerontology. Series A, Biological sciences and medical sciences}, volume = {}, number = {}, pages = {}, doi = {10.1093/gerona/glz104}, pmid = {31044222}, issn = {1758-535X}, abstract = {Recent studies have demonstrated that modifications to the ratio of dietary macronutrients affect longevity in a diverse range of species. However, the degree to which levels of natural genotypic variation shape these dietary effects on longevity remains unclear. The mitochondria have long been linked to the ageing process. The mitochondria possess their own genome, and previous studies have shown that mitochondrial genetic variation affects longevity in insects. Furthermore, the mitochondria are the sites in which dietary nutrients are oxidized to produce adenosine triphosphate, suggesting a capacity for dietary quality to mediate the link between mitochondrial genotype and longevity. Here, we measured longevity of male and female fruit flies, across a panel of genetic strains of Drosophila melanogaster, which vary only in their mitochondrial haplotype, when fed one of two isocaloric diets that differed in their protein-to-carbohydrate ratio. The mitochondrial haplotype affected the longevity of flies, but the pattern of these effects differed across the two diets in males, but not in females. We discuss the implications of these results in relation to an evolutionary theory linking maternal inheritance of mitochondria to the accumulation of male-harming mitochondrial mutations, and to the theory exploring the evolution of phenotypic plasticity to novel environments.}, }
@article {pmid30822116, year = {2019}, author = {Meyer, EH and Welchen, E and Carrie, C}, title = {Assembly of the Complexes of the Oxidative Phosphorylation System in Land Plant Mitochondria.}, journal = {Annual review of plant biology}, volume = {70}, number = {}, pages = {23-50}, doi = {10.1146/annurev-arplant-050718-100412}, pmid = {30822116}, issn = {1545-2123}, abstract = {Plant mitochondria play a major role during respiration by producing the ATP required for metabolism and growth. ATP is produced during oxidative phosphorylation (OXPHOS), a metabolic pathway coupling electron transfer with ADP phosphorylation via the formation and release of a proton gradient across the inner mitochondrial membrane. The OXPHOS system is composed of large, multiprotein complexes coordinating metal-containing cofactors for the transfer of electrons. In this review, we summarize the current state of knowledge about assembly of the OXPHOS complexes in land plants. We present the different steps involved in the formation of functional complexes and the regulatory mechanisms controlling the assembly pathways. Because several assembly steps have been found to be ancestral in plants-compared with those described in fungal and animal models-we discuss the evolutionary dynamics that lead to the conservation of ancestral pathways in land plant mitochondria.}, }
@article {pmid31032404, year = {2019}, author = {John, U and Lu, Y and Wohlrab, S and Groth, M and Janouškovec, J and Kohli, GS and Mark, FC and Bickmeyer, U and Farhat, S and Felder, M and Frickenhaus, S and Guillou, L and Keeling, PJ and Moustafa, A and Porcel, BM and Valentin, K and Glöckner, G}, title = {An aerobic eukaryotic parasite with functional mitochondria that likely lacks a mitochondrial genome.}, journal = {Science advances}, volume = {5}, number = {4}, pages = {eaav1110}, doi = {10.1126/sciadv.aav1110}, pmid = {31032404}, issn = {2375-2548}, abstract = {Dinoflagellates are microbial eukaryotes that have exceptionally large nuclear genomes; however, their organelle genomes are small and fragmented and contain fewer genes than those of other eukaryotes. The genus Amoebophrya (Syndiniales) comprises endoparasites with high genetic diversity that can infect other dinoflagellates, such as those forming harmful algal blooms (e.g., Alexandrium). We sequenced the genome (~100 Mb) of Amoebophrya ceratii to investigate the early evolution of genomic characters in dinoflagellates. The A. ceratii genome encodes almost all essential biosynthetic pathways for self-sustaining cellular metabolism, suggesting a limited dependency on its host. Although dinoflagellates are thought to have descended from a photosynthetic ancestor, A. ceratii appears to have completely lost its plastid and nearly all genes of plastid origin. Functional mitochondria persist in all life stages of A. ceratii, but we found no evidence for the presence of a mitochondrial genome. Instead, all mitochondrial proteins appear to be lost or encoded in the A. ceratii nucleus.}, }
@article {pmid30468939, year = {2019}, author = {Weber, AA and Stöhr, S and Chenuil, A}, title = {Species delimitation in the presence of strong incomplete lineage sorting and hybridization: Lessons from Ophioderma (Ophiuroidea: Echinodermata).}, journal = {Molecular phylogenetics and evolution}, volume = {131}, number = {}, pages = {138-148}, doi = {10.1016/j.ympev.2018.11.014}, pmid = {30468939}, issn = {1095-9513}, mesh = {Animals ; Bayes Theorem ; DNA, Mitochondrial ; Discriminant Analysis ; Echinodermata/*classification/*genetics ; Geography ; *Hybridization, Genetic ; Mitochondria/genetics ; Multigene Family ; *Phylogeny ; Principal Component Analysis ; Species Specificity ; Time Factors ; }, abstract = {Accurate species delimitation is essential to properly assess biodiversity, but also for management and conservation purposes. Yet, it is not always trivial to accurately define species boundaries in closely related species due to incomplete lineage sorting. Additional difficulties may be caused by hybridization, now evidenced as a frequent phenomenon. The brittle star cryptic species complex Ophioderma longicauda encompasses six mitochondrial lineages, including broadcast spawners and internal brooders, yet the actual species boundaries are unknown. Here, we combined three methods to delimit species in the Ophioderma longicauda complex and to infer its divergence history: (i) unsupervised species discovery based on multilocus genotypes; (ii) divergence time estimation using the multi-species coalescent; (iii) divergence scenario testing (including gene flow) using Approximate Bayesian Computation (ABC) methods. 30 sequence markers (transcriptome-based, mitochondrial or non-coding) for 89 O. longicauda and outgroup individuals were used. First, multivariate analyses revealed six genetic clusters, which globally corresponded to the mitochondrial lineages, yet with many exceptions, suggesting ancient hybridization events and challenging traditional mitochondrial barcoding approaches. Second, multi-species coalescent-based analyses confirmed the occurrence of six species and provided divergence time estimates, but the sole use of this method failed to accurately delimit species, highlighting the power of multilocus genotype clustering to delimit recently diverged species. Finally, Approximate Bayesian Computation showed that the most likely scenario involves hybridization between brooders and broadcasters. Our study shows that despite strong incomplete lineage sorting and past hybridization, accurate species delimitation in Ophioderma was possible using a combination of complementary methods. We propose that these methods, especially multilocus genotype clustering, may be useful to resolve other complex speciation histories.}, }
@article {pmid30067212, year = {2018}, author = {Barthole, G}, title = {[Never alone. Microorganism, ecology, evolution].}, journal = {Medecine sciences : M/S}, volume = {34}, number = {6-7}, pages = {604-607}, doi = {10.1051/medsci/20183406023}, pmid = {30067212}, issn = {1958-5381}, mesh = {Animals ; *Biological Evolution ; Civilization ; *Ecosystem ; Endophytes/*physiology ; Host Microbial Interactions/physiology ; Humans ; Microbial Interactions/physiology ; Mitochondria/physiology ; Plants/microbiology ; Symbiosis/*physiology ; }, }
@article {pmid31016002, year = {2019}, author = {Pogoda, CS and Keepers, KG and Nadiadi, AY and Bailey, DW and Lendemer, JC and Tripp, EA and Kane, NC}, title = {Genome streamlining via complete loss of introns has occurred multiple times in lichenized fungal mitochondria.}, journal = {Ecology and evolution}, volume = {9}, number = {7}, pages = {4245-4263}, doi = {10.1002/ece3.5056}, pmid = {31016002}, issn = {2045-7758}, abstract = {Reductions in genome size and complexity are a hallmark of obligate symbioses. The mitochondrial genome displays clear examples of these reductions, with the ancestral alpha-proteobacterial genome size and gene number having been reduced by orders of magnitude in most descendent modern mitochondrial genomes. Here, we examine patterns of mitochondrial evolution specifically looking at intron size, number, and position across 58 species from 21 genera of lichenized Ascomycete fungi, representing a broad range of fungal diversity and niches. Our results show that the cox1gene always contained the highest number of introns out of all the mitochondrial protein-coding genes, that high intron sequence similarity (>90%) can be maintained between different genera, and that lichens have undergone at least two instances of complete, genome-wide intron loss consistent with evidence for genome streamlining via loss of parasitic, noncoding DNA, in Phlyctis boliviensisand Graphis lineola. Notably, however, lichenized fungi have not only undergone intron loss but in some instances have expanded considerably in size due to intron proliferation (e.g., Alectoria fallacina and Parmotrema neotropicum), even between closely related sister species (e.g., Cladonia). These results shed light on the highly dynamic mitochondrial evolution that is occurring in lichens and suggest that these obligate symbiotic organisms are in some cases undergoing recent, broad-scale genome streamlining via loss of protein-coding genes as well as noncoding, parasitic DNA elements.}, }
@article {pmid31012550, year = {2019}, author = {Titov, VN and Sazhina, NN and Evteeva, NМ}, title = {[Ozone oxidizes oleic fatty acid with the highest rate constant and does not oxidize palmitic acid. Different physicochemical parameters of substrates and their role in phylogenesis.].}, journal = {Klinicheskaia laboratornaia diagnostika}, volume = {64}, number = {3}, pages = {132-139}, doi = {10.18821/0869-2084-2019-64-3-132-139}, pmid = {31012550}, issn = {0869-2084}, abstract = {Physicochemical differences between О3 oxidation parameters for palmitic and oleic fatty acids (FA) during phylogenesis (evolution) are fundamental for а) production of palmitoleic monounsaturated fatty (MFA), b) formation of carnitine palmitoyltransferase as a FA transporter to mitochondria, and c) in vivo production of oleic MFA under humoral regulatory effect of insulin. In the strive for the best kinetic parameters of biological organisms without a possibility of modifying physicochemical and biochemical reactions in the mitochondrial matrix, the mitochondria can be provided with a substrate that increases energy production efficiency and the amount of ATP. Physicochemical parameters of oleic MFA has become the standard of an oxidation substrate for in vivo energy production; this MFA was synthesized in organisms for millions of years. Environmental influences are the second factor which determines kinetic perfection of biological organisms during phylogenesis. Are these influences always beneficial? Mostly, they are not. However, they largely stimulate adaptive functions of the organism, including the biological function of locomotion, cognitive function and the function of positioning in the environment. Biological, energy and kinetic perfection formed in vivo can be easily destroyed if phylogenetically herbivorous Homo sapiens abuses the diet of carnivorous animals (meat) which was not consumed by him and his ancestors during phylogenesis. This abuse is the major cause of metabolic pandemias in human population. They are: insulin resistance, atherosclerosis and atheromatosis, obesity and nonalcoholic liver disease. The most effective measures preventing metabolic pandemias, cardiac heart disease and myocardial infarction are extremely simple. People should remain herbivorous.}, }
@article {pmid31010849, year = {2019}, author = {Hsu, J and Reilly, A and Hayes, BJ and Clough, CA and Konnick, EQ and Torok-Storb, B and Gulsuner, S and Wu, D and Becker, PS and Keel, SB and Abkowitz, JL and Doulatov, S}, title = {Reprogramming identifies functionally distinct stages of clonal evolution in myelodysplastic syndromes.}, journal = {Blood}, volume = {}, number = {}, pages = {}, doi = {10.1182/blood.2018884338}, pmid = {31010849}, issn = {1528-0020}, abstract = {Myeloid neoplasms, including myelodysplastic syndromes (MDS), are genetically heterogeneous disorders driven by clonal acquisition of somatic mutations in hematopoietic stem and progenitor cells (HPCs). The order of premalignant mutations and their impact on HPC self-renewal and differentiation remain poorly understood. We demonstrate that episomal reprogramming of MDS patient samples generates induced pluripotent stem cells (iPSCs) from single premalignant cells with a partial complement of mutations, directly informing the temporal order of mutations in the individual patient. Reprogramming preferentially captured early subclones with fewer mutations, which were rare among single patient cells. To evaluate the functional impact of clonal evolution in individual patients, we differentiated isogenic MDS-iPSCs harboring up to four successive clonal abnormalities recapitulating a progressive decrease in hematopoietic differentiation potential. SF3B1, in concert with epigenetic mutations, perturbed mitochondrial function leading to accumulation of damaged mitochondria during disease progression, resulting in apoptosis and ineffective erythropoiesis. Reprogramming also informed the order of premalignant mutations in patients with complex karyotype, and identified 5q deletion [del(5q)] as an early cytogenetic anomaly. Del(5q) cooperated with TP53 mutations to regulate genome stability promoting acquisition of structural and karyotypic abnormalities. Reprogramming thus enables molecular and functional interrogation of preleukemic clonal evolution, identifying mitochondrial function and chromosome stability as key pathways impacted by acquisition of somatic mutations in MDS.}, }
@article {pmid31004483, year = {2019}, author = {Tobler, M and Barts, N and Greenway, R}, title = {Mitochondria and the origin of species: bridging genetic and ecological perspectives on speciation processes.}, journal = {Integrative and comparative biology}, volume = {}, number = {}, pages = {}, doi = {10.1093/icb/icz025}, pmid = {31004483}, issn = {1557-7023}, abstract = {Mitochondria have been known to be involved in speciation through the generation of Dobzhansky-Muller incompatibilities, where functionally neutral co-evolution between mitochondrial and nuclear genomes can cause dysfunction when alleles are recombined in hybrids. We propose that adaptive mitochondrial divergence between populations can not only produce intrinsic (Dobzhansky-Muller) incompatibilities, but could also contribute to reproductive isolation through natural and sexual selection against migrants, post-mating prezygotic isolation, as well as by causing extrinsic reductions in hybrid fitness. We describe how these reproductive isolating barriers can potentially arise through adaptive divergence of mitochondrial function in the absence of mito-nuclear coevolution, a departure from more established views. While a role for mitochondria in the speciation process appears promising, we also highlight critical gaps of knowledge: (1) many systems with a potential for mitochondrially-mediated reproductive isolation lack crucial evidence directly linking reproductive isolation and mitochondrial function; (2) it often remains to be seen if mitochondrial barriers are a driver or a consequence of reproductive isolation; (3) the presence of substantial gene flow in the presence of mito-nuclear incompatibilities raises questions whether such incompatibilities are strong enough to drive speciation to completion; and (4) it remains to be tested how mitochondrial effects on reproductive isolation compare when multiple mechanisms of reproductive isolation coincide. We hope this perspective and the proposed research plans help to inform future studies of mitochondrial adaptation in a manner that links genotypic changes to phenotypic adaptations, fitness, and reproductive isolation in natural systems, helping to clarify the importance of mitochondria in the formation and maintenance of biological diversity.}, }
@article {pmid31001816, year = {2019}, author = {Meany, MK and Conner, WR and Richter, SV and Bailey, JA and Turelli, M and Cooper, BS}, title = {Loss of cytoplasmic incompatibility and minimal fecundity effects explain relatively low Wolbachia frequencies in Drosophila mauritiana.}, journal = {Evolution; international journal of organic evolution}, volume = {}, number = {}, pages = {}, doi = {10.1111/evo.13745}, pmid = {31001816}, issn = {1558-5646}, abstract = {Maternally transmitted Wolbachia bacteria infect about half of all insect species. Many Wolbachia cause cytoplasmic incompatibility (CI), reduced egg hatch when uninfected females mate with infected males. Although CI produces a frequency-dependent fitness advantage that leads to high equilibrium Wolbachia frequencies, it does not aid Wolbachia spread from low frequencies. Indeed, the fitness advantages that produce initial Wolbachia spread and maintain non-CI Wolbachia remain elusive. wMau Wolbachia infecting Drosophila mauritiana do not cause CI, despite being very similar to CI-causing wNo from D. simulans (0.068% sequence divergence over 682,494 bp), suggesting recent CI loss. Using draft wMau genomes, we identify a deletion in a CI-associated gene, consistent with theory predicting that selection within host lineages does not act to increase or maintain CI. In the laboratory, wMau shows near-perfect maternal transmission; but we find no significant effect on host fecundity, in contrast to published data. Intermediate wMau frequencies on the island Mauritius are consistent with a balance between unidentified small, positive fitness effects and imperfect maternal transmission. Our phylogenomic analyses suggest that group-B Wolbachia, including wMau and wPip, diverged from group-A Wolbachia, such as wMel and wRi, 6-46 million years ago, more recently than previously estimated. This article is protected by copyright. All rights reserved.}, }
@article {pmid30999558, year = {2019}, author = {Nibert, ML and Debat, HJ and Manny, AR and Grigoriev, IV and De Fine Licht, HH}, title = {Mitovirus and Mitochondrial Coding Sequences from Basal Fungus Entomophthora muscae.}, journal = {Viruses}, volume = {11}, number = {4}, pages = {}, doi = {10.3390/v11040351}, pmid = {30999558}, issn = {1999-4915}, support = {T32 AI007245//National Institutes of Health/ ; DE-AC02-05CH11231//U.S. Department of Energy/ ; 10122//Villum Fonden/ ; }, abstract = {Fungi constituting the Entomophthora muscae species complex (members of subphylum Entomophthoromycotina, phylum Zoopagamycota) commonly kill their insect hosts and manipulate host behaviors in the process. In this study, we made use of public transcriptome data to identify and characterize eight new species of mitoviruses associated with several different E. muscae isolates. Mitoviruses are simple RNA viruses that replicate in host mitochondria and are frequently found in more phylogenetically apical fungi (members of subphylum Glomeromyoctina, phylum Mucoromycota, phylum Basidiomycota and phylum Ascomycota) as well as in plants. E. muscae is the first fungus from phylum Zoopagomycota, and thereby the most phylogenetically basal fungus, found to harbor mitoviruses to date. Multiple UGA (Trp) codons are found not only in each of the new mitovirus sequences from E. muscae but also in mitochondrial core-gene coding sequences newly assembled from E. muscae transcriptome data, suggesting that UGA (Trp) is not a rarely used codon in the mitochondria of this fungus. The presence of mitoviruses in these basal fungi has possible implications for the evolution of these viruses.}, }
@article {pmid30997305, year = {2019}, author = {Kanchan, S and Sharma, P and Chowdhury, S}, title = {Evolution of endonuclease IV protein family: an in silico analysis.}, journal = {3 Biotech}, volume = {9}, number = {5}, pages = {168}, doi = {10.1007/s13205-019-1696-6}, pmid = {30997305}, issn = {2190-572X}, abstract = {DNA repair is one of the key cellular events which balances between evolvability and integrity of the genome. Endonuclease IV enzymes are class II AP endonucleases under base excision repair pathway which act on abasic site and break the phosphodiester bond at the 5' side. The role and activity of endonuclease IV proteins vary among different organisms; even it is absent in higher eukaryotes. The evolution of this protein family was studied by analyzing all homologs of the endonuclease IV protein family through different in silico techniques including phylogenetic tree generation and model building. The sequence analysis revealed four consensus sequence motifs within the AP2EC domain which are functionally important and conserved throughout the evolution process. It was also observed that the species and endonuclease IV gene evolution shape up differently in most of the organisms. Presence of the mitochondria-targeted signal peptides in fungal species Saccharomyces and Coccidioides suggest a possible endosymbiotic transfer of endonuclease IV genes to lower eukaryotes. Evolutionary changes among various clades in the protein-based phylogenetic tree have been investigated by comparison of homology models which suggests the conservation of overall fold of endonuclease IV proteins except for few alterations in loop orientation in few clades.}, }
@article {pmid30326913, year = {2018}, author = {Zhu, Y and Gu, X and Xu, C}, title = {Mitochondrial DNA 7908-8816 region mutations in maternally inherited essential hypertensive subjects in China.}, journal = {BMC medical genomics}, volume = {11}, number = {1}, pages = {89}, pmid = {30326913}, issn = {1755-8794}, abstract = {BACKGROUND: Nuclear genes or family-based mitochondrial screening have been the focus of genetic studies into essential hypertension. Studies into the role of mitochondria in sporadic Chinese hypertensives are lacking. The objective of the study was to explore the relationship between mitochondrial DNA (mtDNA) variations and the development of maternally inherited essential hypertension (MIEH) in China.<br><br>METHODS: Yangzhou residents who were outpatients or in-patients at the Department of Cardiology in Northern Jiangsu People's Hospital (Jiangsu, China) from June 2009 to June 2015 were recruited in a 1:1 case control study of 600 gender-matched Chinese MIEH subjects and controls. Genomic DNA was isolated from whole blood cells. The most likely sites for hypertension were screened using oligodeoxynucleotides at positions 7908-8816, purified and subsequently analyzed by direct sequencing according to the revised consensus Cambridge sequence. The frequency, density, type and conservative evolution of mtDNA variations were comprehensively analyzed.<br><br>RESULTS: We found a statistical difference between the two groups for body mass index, waist circumference, abdominal circumference, triglyceride, low-density lipoprotein cholesterol, fasting blood glucose, uric acid, creatinine and blood urea nitrogen (P < 0.05). More amino-acid changes and RNA variants were found in MIEH subjects than the controls (P < 0.01). The detection system simultaneously identified 40 different heteroplasmic or homoplasmic mutations in 4 genes: COXII, tRNALys, ATP8 and ATP 6. The mtDNA variations were mainly distributed in regions of ATP6 binding sites, and the site of highest mutation frequency was m. 8414C > T. Three changes in single bases (C8414T in ATP8, A8701G in ATP6 and G8584A in ATP6) were significantly different in the MIEH patients and the controls (P < 0.001). The m.8273_8281del mutation was identified from 59 MIEH patients.<br><br>CONCLUSIONS: Our results indicate that novel mtDNA mutations may be involved in the pathological process of MIEH, and mitochondrial genetic characteristics were identified in MIEH individuals.}, }
@article {pmid30630408, year = {2019}, author = {Giannoulis, T and Plageras, D and Stamatis, C and Chatzivagia, E and Tsipourlianos, A and Birtsas, P and Billinis, C and Suchentrunk, F and Mamuris, Z}, title = {Islands and hybrid zones: combining the knowledge from &quot;Natural Laboratories&quot; to explain phylogeographic patterns of the European brown hare.}, journal = {BMC evolutionary biology}, volume = {19}, number = {1}, pages = {17}, doi = {10.1186/s12862-019-1354-y}, pmid = {30630408}, issn = {1471-2148}, mesh = {Alleles ; Animals ; DNA, Mitochondrial/genetics ; Exons/genetics ; Gene Frequency/genetics ; Genetic Variation ; Haplotypes ; Hares/*genetics ; *Hybridization, Genetic ; *Islands ; Major Histocompatibility Complex/genetics ; Microsatellite Repeats/genetics ; Mitochondria/genetics ; Phylogeny ; *Phylogeography ; }, abstract = {BACKGROUND: The aim of the study was to use hybrid populations as well as island populations of the European brown hare (Lepus europaeus) to explore the effect of evolutionary events, such as the post-deglaciation translocations, spontaneous and human-mediated, local adaptation and the genetic drift in the shaping of the phylogeographic patterns of the species. For this purpose, we used molecular markers, both nuclear and mitochondrial, that are indicative for local adaptation as well as neutral markers to elucidate the patterns of population differentiation based on geographic isolation and the clade of origin. To broaden our analysis, we included data from our previous studies concerning mainland populations, to explore the genetic differentiation in the base of the geographic origin (mainland/island) of the populations.<br><br>RESULTS: Our results suggest that local adaptation shapes the differentiation in both genomes, favoring specific alleles in nuclear genes (e.g. DQA) or haplotypes in mtDNA (e.g. Control Region, CR). mtDNA variation was found to be in a higher level and was able to give a phylogeographic signal for the populations. Furthermore, the degree of variation was influenced not only by the geographic origin, but also by the clade of origin, since specific island populations of Anatolian origin showed a greater degree of variation compared to specific mainland populations of the European clade. Concerning the hybrid population, we confirmed the existence of both clades in the territory and we provided a possible explanation for the lack of introgression between the clades.<br><br>CONCLUSION: Our results indicate that the Quaternary's climatic oscillations played a major role in the shaping of the phylogeographic patterns of the species, by isolating populations in the distinct refugia, where they adapted and differentiate in allopatry, leading to genome incompatibilities observed nowadays.}, }
@article {pmid30630407, year = {2019}, author = {Ceballos, SG and Roesti, M and Matschiner, M and Fernández, DA and Damerau, M and Hanel, R and Salzburger, W}, title = {Phylogenomics of an extra-Antarctic notothenioid radiation reveals a previously unrecognized lineage and diffuse species boundaries.}, journal = {BMC evolutionary biology}, volume = {19}, number = {1}, pages = {13}, doi = {10.1186/s12862-019-1345-z}, pmid = {30630407}, issn = {1471-2148}, mesh = {Animals ; Antarctic Regions ; Base Sequence ; Calibration ; Fishes/*classification ; Genetic Loci ; Genetic Markers ; Genetic Variation ; Genome ; Haplotypes/genetics ; Likelihood Functions ; Mitochondria/genetics ; *Phylogeny ; Phylogeography ; Polymorphism, Single Nucleotide/genetics ; Sequence Analysis, DNA ; Species Specificity ; Time Factors ; }, abstract = {BACKGROUND: The impressive adaptive radiation of notothenioid fishes in Antarctic waters is generally thought to have been facilitated by an evolutionary key innovation, antifreeze glycoproteins, permitting the rapid evolution of more than 120 species subsequent to the Antarctic glaciation. By way of contrast, the second-most species-rich notothenioid genus, Patagonotothen, which is nested within the Antarctic clade of Notothenioidei, is almost exclusively found in the non-Antarctic waters of Patagonia. While the drivers of the diversification of Patagonotothen are currently unknown, they are unlikely to be related to antifreeze glycoproteins, given that water temperatures in Patagonia are well above freezing point. Here we performed a phylogenetic analysis based on genome-wide single nucleotide polymorphisms (SNPs) derived from restriction site-associated DNA sequencing (RADseq) in a total of twelve Patagonotothen species.<br><br>RESULTS: We present a well-supported, time-calibrated phylogenetic hypothesis including closely and distantly related outgroups, confirming the monophyly of the genus Patagonotothen with an origin approximately 3 million years ago and the paraphyly of both the sister genus Lepidonotothen and the family Notothenidae. Our phylogenomic and population genetic analyses highlight a previously unrecognized linage and provide evidence for shared genetic variation between some closely related species. We also provide a mitochondrial phylogeny showing mitonuclear discordance.<br><br>CONCLUSIONS: Based on a combination of phylogenomic and population genomic approaches, we provide evidence for the existence of a new, potentially cryptic, Patagonotothen species, and demonstrate that genetic boundaries between some closely related species are diffuse, likely due to recent introgression and/or incomplete linage sorting. The detected mitonuclear discordance highlights the limitations of relying on a single locus for species barcoding. In addition, our time-calibrated phylogenetic hypothesis shows that the early burst of diversification roughly coincides with the onset of the intensification of Quaternary glacial cycles and that the rate of species accumulation may have been stepwise rather than constant. Our phylogenetic framework not only advances our understanding of the origin of a high-latitude marine radiation, but also provides the basis for the study of the ecology and life history of the genus Patagonotothen, as well as for their conservation and commercial management.}, }
@article {pmid30980669, year = {2019}, author = {Johri, P and Marinov, GK and Doak, TG and Lynch, M}, title = {Population genetics of Paramecium mitochondrial genomes: recombination, mutation spectrum, and efficacy of selection.}, journal = {Genome biology and evolution}, volume = {}, number = {}, pages = {}, doi = {10.1093/gbe/evz081}, pmid = {30980669}, issn = {1759-6653}, abstract = {The evolution of mitochondrial genomes and their population-genetic environment among unicellular eukaryotes are understudied. Ciliate mitochondrial genomes exhibit a unique combination of characteristics, including a linear organization and the presence of multiple genes with no known function or detectable homologs in other eukaryotes. Here we study the variation of ciliate mitochondrial genomes both within and across thirteen highly diverged Paramecium species, including multiple species from the P. aurelia species complex, with four outgroup species: P. caudatum, P. multimicronucleatum, and two strains that may represent novel related species. We observe extraordinary conservation of gene order and protein-coding content in Paramecium mitochondria across species. In contrast, significant differences are observed in tRNA content and copy number, which is highly conserved in species belonging to the P. aurelia complex but variable among and even within the other Paramecium species. There is an increase in GC content from ∼20% to ∼40% on the branch leading to the P. aurelia complex. Patterns of polymorphism in population-genomic data and mutation-accumulation experiments suggest that the increase in GC content is primarily due to changes in the mutation spectra in the P. aurelia species. Finally, we find no evidence of recombination in Paramecium mitochondria and find that the mitochondrial genome appears to experience either similar or stronger efficacy of purifying selection than the nucleus.}, }
@article {pmid30968307, year = {2019}, author = {Garcia, LE and Zubko, MK and Zubko, EI and Sanchez-Puerta, MV}, title = {Elucidating genomic patterns and recombination events in plant cybrid mitochondria.}, journal = {Plant molecular biology}, volume = {}, number = {}, pages = {}, doi = {10.1007/s11103-019-00869-z}, pmid = {30968307}, issn = {1573-5028}, support = {M033//Universidad Nacional de Cuyo/ ; PICT1762//Fondo para la Investigación Científica y Tecnológica/ ; 1062432//National Science Foundation/ ; }, abstract = {KEY MESSAGE: Cybrid plant mitochondria undergo homologous recombination, mainly BIR, keep a single allele for each gene, and maintain exclusive sequences of each parent and a single copy of the homologous regions. The maintenance of a dynamic equilibrium between the mitochondrial and nuclear genomes requires continuous communication and a high level of compatibility between them, so that alterations in one genetic compartment need adjustments in the other. The co-evolution of nuclear and mitochondrial genomes has been poorly studied, even though the consequences and effects of this interaction are highly relevant for human health, as well as for crop improvement programs and for genetic engineering. The mitochondria of plants represent an excellent system to understand the mechanisms of genomic rearrangements, chimeric gene formation, incompatibility between nucleus and cytoplasm, and horizontal gene transfer. We carried out detailed analyses of the mtDNA of a repeated cybrid between the solanaceae Nicotiana tabacum and Hyoscyamus niger. The mtDNA of the cybrid was intermediate between the size of the parental mtDNAs and the sum of them. Noticeably, most of the homologous sequences inherited from both parents were lost. In contrast, the majority of the sequences exclusive of a single parent were maintained. The mitochondrial gene content included a majority of N. tabacum derived genes, but also chimeric, two-parent derived, and H. niger-derived genes in a tobacco nuclear background. Any of these alterations in the gene content could be the cause of CMS in the cybrid. The parental mtDNAs interacted through 28 homologous recombination events and a single case of illegitimate recombination. Three main homologous recombination mechanisms were recognized in the cybrid mitochondria. Break induced replication (BIR) pathway was the most frequent. We propose that BIR could be one of the mechanisms responsible for the loss of the majority of the repeated regions derived from H. niger.}, }
@article {pmid30968120, year = {2019}, author = {Mays, JN and Camacho-Villasana, Y and Garcia-Villegas, R and Perez-Martinez, X and Barrientos, A and Fontanesi, F}, title = {The mitoribosome-specific protein mS38 is preferentially required for synthesis of cytochrome c oxidase subunits.}, journal = {Nucleic acids research}, volume = {}, number = {}, pages = {}, doi = {10.1093/nar/gkz266}, pmid = {30968120}, issn = {1362-4962}, abstract = {Message-specific translational regulation mechanisms shape the biogenesis of multimeric oxidative phosphorylation (OXPHOS) enzyme in mitochondria from the yeast Saccharomyces cerevisiae. These mechanisms, driven mainly by the action of mRNA-specific translational activators, help to coordinate synthesis of OXPHOS catalytic subunits by the mitoribosomes with both the import of their nucleus-encoded partners and their assembly to form the holocomplexes. However, little is known regarding the role that the mitoribosome itself may play in mRNA-specific translational regulation. Here, we show that the mitoribosome small subunit protein Cox24/mS38, known to be necessary for mitoribosome-specific intersubunit bridge formation and 15S rRNA H44 stabilization, is required for efficient mitoribogenesis. Consequently, mS38 is necessary to sustain the overall mitochondrial protein synthesis rate, despite an adaptive ∼2-fold increase in mitoribosome abundance in mS38-deleted cells. Additionally, the absence of mS38 preferentially disturbs translation initiation of COX1, COX2, and COX3 mRNAs, without affecting the levels of mRNA-specific translational activators. We propose that mS38 confers the mitochondrial ribosome an intrinsic capacity of translational regulation, probably acquired during evolution from bacterial ribosomes to facilitate the translation of mitochondrial mRNAs, which lack typical anti-Shine-Dalgarno sequences.}, }
@article {pmid30965625, year = {2019}, author = {Nelson, ED and Grishin, NV}, title = {How Often Do Protein Genes Navigate Valleys of Low Fitness?.}, journal = {Genes}, volume = {10}, number = {4}, pages = {}, doi = {10.3390/genes10040283}, pmid = {30965625}, issn = {2073-4425}, support = {GM127390//National Institutes of Health/ ; }, abstract = {To escape from local fitness peaks, a population must navigate across valleys of low fitness. How these transitions occur, and what role they play in adaptation, have been subjects of active interest in evolutionary genetics for almost a century. However, to our knowledge, this problem has never been addressed directly by considering the evolution of a gene, or group of genes, as a whole, including the complex effects of fitness interactions among multiple loci. Here, we use a precise model of protein fitness to compute the probability P (s , Δ t) that an allele, randomly sampled from a population at time t, has crossed a fitness valley of depth s during an interval t - Δ t , t in the immediate past. We study populations of model genes evolving under equilibrium conditions consistent with those in mammalian mitochondria. From this data, we estimate that genes encoding small protein motifs navigate fitness valleys of depth 2 N s ≳ 30 with probability P ≳ 0 . 1 on a time scale of human evolution, where N is the (mitochondrial) effective population size. The results are consistent with recent findings for Watson⁻Crick switching in mammalian mitochondrial tRNA molecules.}, }
@article {pmid30959949, year = {2019}, author = {Hirakawa, Y and Watanabe, A}, title = {Organellar DNA Polymerases in Complex Plastid-Bearing Algae.}, journal = {Biomolecules}, volume = {9}, number = {4}, pages = {}, doi = {10.3390/biom9040140}, pmid = {30959949}, issn = {2218-273X}, abstract = {DNA replication in plastids and mitochondria is generally regulated by nucleus-encoded proteins. In plants and red algae, a nucleus-encoded enzyme called POP (plant and protist organellar DNA polymerase) is involved in DNA replication in both organelles by virtue of its dual localization. POPs are family A DNA polymerases, which include bacterial DNA polymerase I (PolI). POP homologs have been found in a wide range of eukaryotes, including plants, algae, and non-photosynthetic protists. However, the phylogeny and subcellular localizations of POPs remain unclear in many algae, especially in secondary and tertiary plastid-bearing groups. In this study, we report that chlorarachniophytes possess two evolutionarily distinct POPs, and fluorescent protein-tagging experiments demonstrate that they are targeted to the secondary plastids and mitochondria, respectively. The timing of DNA replication is different between the two organelles in the chlorarachniophyte Bigelowiella natans, and this seems to be correlated to the transcription of respective POP genes. Dinoflagellates also carry two distinct POP genes, possibly for their plastids and mitochondria, whereas haptophytes and ochrophytes have only one. Therefore, unlike plants, some algal groups are likely to have evolved multiple DNA polymerases for various organelles. This study provides a new insight into the evolution of organellar DNA replication in complex plastid-bearing organisms.}, }
@article {pmid30941136, year = {2019}, author = {Duvvuri, B and Lood, C}, title = {Cell-Free DNA as a Biomarker in Autoimmune Rheumatic Diseases.}, journal = {Frontiers in immunology}, volume = {10}, number = {}, pages = {502}, doi = {10.3389/fimmu.2019.00502}, pmid = {30941136}, issn = {1664-3224}, abstract = {Endogenous DNA is primarily found intracellularly in nuclei and mitochondria. However, extracellular, cell-free (cf) DNA, has been observed in several pathological conditions, including autoimmune diseases, prompting the interest of developing cfDNA as a potential biomarker. There is an upsurge in studies considering cfDNA to stratify patients, monitor the treatment response and predict disease progression, thus evaluating the prognostic potential of cfDNA for autoimmune diseases. Since the discovery of elevated cfDNA levels in lupus patients in the 1960s, cfDNA research in autoimmune diseases has mainly focused on the overall quantification of cfDNA and the association with disease activity. However, with recent technological advancements, including genomic and methylomic sequencing, qualitative changes in cfDNA are being explored in autoimmune diseases, similar to the ones used in molecular profiling of cfDNA in cancer patients. Further, the intracellular origin, e.g., if derived from mitochondrial or nuclear source, as well as the complexing with carrier molecules, including LL-37 and HMGB1, has emerged as important factors to consider when analyzing the quality and inflammatory potential of cfDNA. The clinical relevance of cfDNA in autoimmune rheumatic diseases is strengthened by mechanistic insights into the biological processes that result in an enhanced release of DNA into the circulation during autoimmune and inflammatory conditions. Prior work have established an important role of accelerated apoptosis and impaired clearance in leakage of nucleic acids into the extracellular environment. Findings from more recent studies, including our own investigations, have demonstrated that NETosis, a neutrophil cell death process, can result in a selective extrusion of inflammatory mitochondrial DNA; a process which is enhanced in patients with lupus and rheumatoid arthritis. In this review, we will summarize the evolution of cfDNA, both nuclear and mitochondrial DNA, as biomarkers for autoimmune rheumatic diseases and discuss limitations, challenges and implications to establish cfDNA as a biomarker for clinical use. This review will also highlight recent advancements in mechanistic studies demonstrating mitochondrial DNA as a central component of cfDNA in autoimmune rheumatic diseases.}, }
@article {pmid30941110, year = {2019}, author = {Moelling, K and Broecker, F}, title = {Viruses and Evolution - Viruses First? A Personal Perspective.}, journal = {Frontiers in microbiology}, volume = {10}, number = {}, pages = {523}, doi = {10.3389/fmicb.2019.00523}, pmid = {30941110}, issn = {1664-302X}, abstract = {The discovery of exoplanets within putative habitable zones revolutionized astrobiology in recent years. It stimulated interest in the question about the origin of life and its evolution. Here, we discuss what the roles of viruses might have been at the beginning of life and during evolution. Viruses are the most abundant biological entities on Earth. They are present everywhere, in our surrounding, the oceans, the soil and in every living being. Retroviruses contributed to about half of our genomic sequences and to the evolution of the mammalian placenta. Contemporary viruses reflect evolution ranging from the RNA world to the DNA-protein world. How far back can we trace their contribution? Earliest replicating and evolving entities are the ribozymes or viroids fulfilling several criteria of life. RNA can perform many aspects of life and influences our gene expression until today. The simplest structures with non-protein-coding information may represent models of life built on structural, not genetic information. Viruses today are obligatory parasites depending on host cells. Examples of how an independent lifestyle might have been lost include mitochondria, chloroplasts, Rickettsia and others, which used to be autonomous bacteria and became intracellular parasites or endosymbionts, thereby losing most of their genes. Even in vitro the loss of genes can be recapitulated all the way from coding to non-coding RNA. Furthermore, the giant viruses may indicate that there is no sharp border between living and non-living entities but an evolutionary continuum. Here, it is discussed how viruses can lose and gain genes, and that they are essential drivers of evolution. This discussion may stimulate the thinking about viruses as early possible forms of life. Apart from our view &quot;viruses first&quot;, there are others such as &quot;proteins first&quot; and &quot;metabolism first.&quot;}, }
@article {pmid30938771, year = {2019}, author = {Lama, S and Broda, M and Abbas, Z and Vaneechoutte, D and Belt, K and Säll, T and Vandepoele, K and Van Aken, O}, title = {Neofunctionalization of Mitochondrial Proteins and Incorporation into Signaling Networks in Plants.}, journal = {Molecular biology and evolution}, volume = {}, number = {}, pages = {}, doi = {10.1093/molbev/msz031}, pmid = {30938771}, issn = {1537-1719}, abstract = {Because of their symbiotic origin, many mitochondrial proteins are well conserved across eukaryotic kingdoms. It is however less obvious how specific lineages have obtained novel nuclear-encoded mitochondrial proteins. Here, we report a case of mitochondrial neofunctionalization in plants. Phylogenetic analysis of genes containing the Domain of Unknown Function 295 (DUF295) revealed that the domain likely originated in Angiosperms. The C-terminal DUF295 domain is usually accompanied by an N-terminal F-box domain, involved in ubiquitin ligation via binding with ASK1/SKP1-type proteins. Due to gene duplication, the gene family has expanded rapidly, with 94 DUF295-related genes in Arabidopsis thaliana alone. Two DUF295 family subgroups have uniquely evolved and quickly expanded within Brassicaceae. One of these subgroups has completely lost the F-box, but instead obtained strongly predicted mitochondrial targeting peptides. We show that several representatives of this DUF295 Organellar group are effectively targeted to plant mitochondria and chloroplasts. Furthermore, many DUF295 Organellar genes are induced by mitochondrial dysfunction, whereas F-Box DUF295 genes are not. In agreement, several Brassicaceae-specific DUF295 Organellar genes were incorporated in the evolutionary much older ANAC017-dependent mitochondrial retrograde signaling pathway. Finally, a representative set of DUF295 T-DNA insertion mutants was created. No obvious aberrant phenotypes during normal growth and mitochondrial dysfunction were observed, most likely due to the large extent of gene duplication and redundancy. Overall, this study provides insight into how novel mitochondrial proteins can be created via &quot;intercompartmental&quot; gene duplication events. Moreover, our analysis shows that these newly evolved genes can then be specifically integrated into relevant, pre-existing coexpression networks.}, }
@article {pmid30936856, year = {2019}, author = {Degli Esposti, M and Mentel, M and Martin, W and Sousa, FL}, title = {Oxygen Reductases in Alphaproteobacterial Genomes: Physiological Evolution From Low to High Oxygen Environments.}, journal = {Frontiers in microbiology}, volume = {10}, number = {}, pages = {499}, doi = {10.3389/fmicb.2019.00499}, pmid = {30936856}, issn = {1664-302X}, abstract = {Oxygen reducing terminal oxidases differ with respect to their subunit composition, heme groups, operon structure, and affinity for O2. Six families of terminal oxidases are currently recognized, all of which occur in alphaproteobacterial genomes, two of which are also present in mitochondria. Many alphaproteobacteria encode several different terminal oxidases, likely reflecting ecological versatility with respect to oxygen levels. Terminal oxidase evolution likely started with the advent of O2 roughly 2.4 billion years ago and terminal oxidases diversified in the Proterozoic, during which oxygen levels remained low, around the Pasteur point (ca. 2 μM O2). Among the alphaproteobacterial genomes surveyed, those from members of the Rhodospirillaceae reveal the greatest diversity in oxygen reductases. Some harbor all six terminal oxidase types, in addition to many soluble enzymes typical of anaerobic fermentations in mitochondria and hydrogenosomes of eukaryotes. Recent data have it that O2 levels increased to current values (21% v/v or ca. 250 μM) only about 430 million years ago. Ecological adaptation brought forth different lineages of alphaproteobacteria and different lineages of eukaryotes that have undergone evolutionary specialization to high oxygen, low oxygen, and anaerobic habitats. Some have remained facultative anaerobes that are able to generate ATP with or without the help of oxygen and represent physiological links to the ancient proteobacterial lineage at the origin of mitochondria and eukaryotes. Our analysis reveals that the genomes of alphaproteobacteria appear to retain signatures of ancient transitions in aerobic metabolism, findings that are relevant to mitochondrial evolution in eukaryotes as well.}, }
@article {pmid30935869, year = {2019}, author = {Zimorski, V and Mentel, M and Tielens, AGM and Martin, WF}, title = {Energy metabolism in anaerobic eukaryotes and Earth's late oxygenation.}, journal = {Free radical biology &amp; medicine}, volume = {}, number = {}, pages = {}, doi = {10.1016/j.freeradbiomed.2019.03.030}, pmid = {30935869}, issn = {1873-4596}, abstract = {Eukaryotes arose about 1.6 billion years ago, at a time when oxygen levels were still very low on Earth, both in the atmosphere and in the ocean. According to newer geochemical data, oxygen rose to approximately its present atmospheric levels very late in evolution, perhaps as late as the origin of land plants (only about 450 million years ago). It is therefore natural that many lineages of eukaryotes harbor, and use, enzymes for oxygen-independent energy metabolism. This paper provides a concise overview of anaerobic energy metabolism in eukaryotes with a focus on anaerobic energy metabolism in mitochondria. We also address the widespread assumption that oxygen improves the overall energetic state of a cell. While it is true that ATP yield from glucose or amino acids is increased in the presence of oxygen, it is also true that the synthesis of biomass costs thirteen times more energy per cell in the presence of oxygen than in anoxic conditions. This is because in the reaction of cellular biomass with O2, the equilibrium lies very far on the side of CO2. The absence of oxygen offers energetic benefits of the same magnitude as the presence of oxygen. Anaerobic and low oxygen environments are ancient. During evolution, some eukaryotes have specialized to life in permanently oxic environments (life on land), other eukaryotes have remained specialized to low oxygen habitats. We suggest that the Km of mitochondrial cytochrome c oxidase of 0.1-10 μM for O2, which corresponds to about 0.04%-4% (avg. 0.4%) of present atmospheric O2 levels, reflects environmental O2 concentrations that existed at the time that the eukaryotes arose.}, }
@article {pmid30927526, year = {2019}, author = {Vays, VB and Vangeli, IM and Eldarov, CM and Efeykin, BD and Bakeeva, LE}, title = {Mitochondria in Obliquely Striated Muscles of the Horsehair Worm Gordionus alpestris (Nematomorpha, Gordioidea) with Structural Organization Typical of Cells with Energy-Intensive Processes.}, journal = {Biochemistry. Biokhimiia}, volume = {84}, number = {1}, pages = {56-61}, doi = {10.1134/S0006297919010073}, pmid = {30927526}, issn = {1608-3040}, abstract = {The ultrastructure of mitochondria in the flattened circomyarian fibers of the horsehair worm Gordionus alpestris (Nemathelminthes) was examined. In contrast to the previously published data, we showed these mitochondria to be giant elongated organelles that densely fill the central cytoplasmic space of the ribbon-like muscle fibers. No fundamental differences were found in the ultrastructure of the muscle tissue mitochondria in actively moving free-living and parasitic G. alpestris worms. The functional significance of the observed ultrastructural organization of mitochondria is discussed in connection with the necessity for an extended mitochondrial membrane system for a uniform supply of active muscle tissue with energy.}, }
@article {pmid30924880, year = {2019}, author = {Sudianto, E and Chaw, SM}, title = {Two independent plastid accD transfers to the nuclear genome of Gnetum and other insights on acetyl-CoA carboxylase evolution in gymnosperms.}, journal = {Genome biology and evolution}, volume = {}, number = {}, pages = {}, doi = {10.1093/gbe/evz059}, pmid = {30924880}, issn = {1759-6653}, abstract = {Acetyl-CoA carboxylase (ACCase) is the key regulator of fatty acid biosynthesis. In most plants, ACCase exists in two locations (cytosol and plastids) and in two forms (homomeric and heteromeric). Heteromeric ACCase comprises four subunits, three of them (ACCA-C) are nuclear-encoded (nr) and the fourth (ACCD) is usually plastid-encoded. Homomeric ACCase is encoded by a single nr-gene (ACC). We investigated the ACCase gene evolution in gymnosperms by examining the transcriptomes of newly sequenced Gnetum ula, combined with 75 transcriptomes and 110 plastomes of other gymnosperms. AccD coding sequences are elongated through the insertion of repetitive DNA in four out of five cupressophyte families (except Sciadopityaceae) and were functionally transferred to the nucleus of gnetophytes and Sciadopitys. We discovered that, among the three genera of gnetophytes, only Gnetum has two copies of nr-accD. Furthermore, using protoplast transient expression assays, we experimentally verified that the nr-accD precursor proteins in Gnetum and Sciadopitys can be delivered to the plastids. Of the two nr-accD copies of Gnetum, one dually targets plastids and mitochondria, while the other potentially targets plastoglobuli. The distinct transit peptides, gene architectures, and flanking sequences between the two Gnetum accDs suggest they have independent origins. Our findings are the first account of two distinctly targeted nr-accDs of any green plants and the most comprehensive analyses of ACCase evolution in gymnosperms to date.}, }
@article {pmid30917630, year = {2019}, author = {Aizawa, S and Brar, G and Tsukamoto, H}, title = {Cell Death and Liver Disease.}, journal = {Gut and liver}, volume = {}, number = {}, pages = {}, doi = {10.5009/gnl18486}, pmid = {30917630}, issn = {2005-1212}, support = {IK6 BX004205/BX/BLRD VA/United States ; }, abstract = {Cell death is now reclassified into several types based on the mechanisms and morphologic phenotype. Understanding of such classifications offers insights into the pathogenesis of liver disease, as well as diagnostic or therapeutic implications. Apoptosis is recognized relatively easily due to its unique morphology, but lytic cell death may occur in the form of accidental necrosis, mitochondria permeability transition-driven necrosis, necroptosis, pyroptosis, ferroptosis, and parthanatos. The cell may be engulfed by neighboring cells due to a loss of integrin signaling or cancer cell competition by entosis, a type of cell death. The classification also includes mechanistically termed cell death such as autophagy-dependent cell death and lysosome-dependent cell death. These different types of cell death may occur uniquely in certain liver diseases but may coexist in the evolution of the disease. They occur in parenchymal and nonparenchymal liver cells, as well as inflammatory cells, causing distinct pathologic consequences. This review briefly covers the recently revised classifications of cell death and discusses their relevance to liver diseases of different etiologies.}, }
@article {pmid30912813, year = {2019}, author = {Weaver, RJ}, title = {Hypothesized evolutionary consequences of the alternative oxidase (AOX) in animal mitochondria.}, journal = {Integrative and comparative biology}, volume = {}, number = {}, pages = {}, doi = {10.1093/icb/icz015}, pmid = {30912813}, issn = {1557-7023}, abstract = {The environment in which eukaryotes first evolved was drastically different from what they experience today, and one of the key limiting factors was the availability of oxygen for mitochondrial respiration. During the transition to a fully oxygenated Earth, other compounds such as sulfide posed a considerable constraint on using mitochondrial aerobic respiration for energy production. The ancestors of animals, and those that first evolved from the simpler eukaryotes have mitochondrial respiratory components that are absent from later-evolving animals. Specifically, mitochondria of most basal metazoans have a sulfide-resistant alternative oxidase (AOX), which provides a secondary oxidative pathway to the classical cytochrome pathway. In this essay, I argue that because of its resistance to sulfide, AOX respiration was critical to the evolution of animals by enabling oxidative metabolism under otherwise inhibitory conditions. I hypothesize that AOX allowed for metabolic flexibility during the stochastic oxygen environment of early Earth which shaped the evolution of basal metazoans. I briefly describe the known functions of AOX, with a particular focus on the decreased production of reactive oxygen species (ROS) during stress conditions. Then, I propose three evolutionary consequences of AOX-mediated protection from ROS observed in basal metazoans: 1) adaptation to stressful environments, 2) the persistence of facultative sexual reproduction, and 3) decreased mitochondrial DNA mutation rates. Recognizing the diversity of mitochondrial respiratory systems present in animals may help resolve the mechanisms involved in major evolutionary processes such as adaptation and speciation.}, }
@article {pmid30912143, year = {2019}, author = {Arocena, M and Landeira, M and Di Paolo, A and Silva, A and Sotelo-Silveira, J and Fernández, A and Alonso, J}, title = {Using a variant of coverslip hypoxia to visualize tumor cell alterations at increasing distances from an oxygen source.}, journal = {Journal of cellular physiology}, volume = {}, number = {}, pages = {}, doi = {10.1002/jcp.28507}, pmid = {30912143}, issn = {1097-4652}, support = {331//Comisión Sectorial de Investigación Científica (CSIC)/ ; //Programa de Desarrollo delas Ciencias Básicas (PEDEClBA)/ ; //Agencia Nacional de Investigación e Innovación (ANII)/ ; }, abstract = {Early stages in tumor development involve growth in confined spaces, where oxygen diffusion is limited and metabolic waste products accumulate. This hostile microenvironment imposes strong selective pressures on tumor cells, leading eventually to the survival and expansion of aggressive subclones that condition further tumor evolution. To model features of this microenvironment in vitro, a diffusional barrier can be introduced in the form of a coverslip placed on top of cells, a method termed coverslip hypoxia. Using a variant of this method, with larger volume between coverslip and cells and with oxygen diffusion occurring only through a small hole in the center of the coverslip, we have visualized alterations in LNCaP tumor cells as a function of their distance to the oxygen source at the center. We observed remarkable morphological changes in LNCaP cells as the distance from the center increases, with cells becoming highly spread, displaying dynamic membrane protrusions and occasionally adopting a migratory phenotype. Concomitantly, cells farther from the center displayed marked increases in the hypoxia marker hypoxyprobe, whereas extracellular pH decreased in the same direction. Cells with altered morphology displayed prominent increases in fibrillar actin, as well as swollen mitochondria with distorted cristae and accumulation of neutral lipid-containing intracellular vesicles. These results show that an in vitro microenvironment that models diffusional barriers encountered by tumors in situ can have profound effects on tumor cells. The coverslip hypoxia variant we describe can be used to characterize in vitro the response of tumor cells to environmental conditions that play crucial roles in early tumor development.}, }
@article {pmid30876291, year = {2019}, author = {Liu, W and Liu, Q and Zhang, Z and Han, Y and Kuang, C and Xu, L and Yang, H and Liu, X}, title = {Three-dimensional super-resolution imaging of live whole cells using galvanometer-based structured illumination microscopy.}, journal = {Optics express}, volume = {27}, number = {5}, pages = {7237-7248}, doi = {10.1364/OE.27.007237}, pmid = {30876291}, issn = {1094-4087}, mesh = {Animals ; Cattle ; Endothelial Cells/*cytology ; Fluorescent Dyes ; *Imaging, Three-Dimensional ; Lighting/*instrumentation ; Microscopy, Fluorescence/*methods ; *Microtubules ; *Mitochondria ; Pulmonary Artery/cytology ; }, abstract = {Imaging and tracking three-dimensional (3D) nanoscale organizations and functions of live cells is essential for biological research but it remains challenging. Among different 3D super-resolution techniques, 3D structured illumination microscopy (SIM) has the intrinsic advantages for live-cell studies; it is based on wide-field imaging and does not require high light intensities or special fluorescent dyes to double 3D resolution. However, the 3D SIM system has developed relatively slowly, especially in live imaging. Here, we report a more flexible 3D SIM system based on two galvanometer sets conveniently controlling the structured illumination pattern's period and orientation, which is able to study dynamics of live whole cells with high speed. We demonstrate our microscope's capabilities with strong optical sectioning and lateral, axial, and volume temporal resolution of 104 nm, 320 nm and 4 s, respectively. We do this by imaging nanoparticle and microtubule organizations and mitochondria evolution. These characteristics enable our galvanometer-based 3D SIM system to broaden the accessible imaging content of SIM-family microscopes and further facilitate their applications in life sciences.}, }
@article {pmid30872488, year = {2019}, author = {Dorrell, RG and Azuma, T and Nomura, M and Audren de Kerdrel, G and Paoli, L and Yang, S and Bowler, C and Ishii, KI and Miyashita, H and Gile, GH and Kamikawa, R}, title = {Principles of plastid reductive evolution illuminated by nonphotosynthetic chrysophytes.}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {116}, number = {14}, pages = {6914-6923}, doi = {10.1073/pnas.1819976116}, pmid = {30872488}, issn = {1091-6490}, abstract = {The division of life into producers and consumers is blurred by evolution. For example, eukaryotic phototrophs can lose the capacity to photosynthesize, although they may retain vestigial plastids that perform other essential cellular functions. Chrysophyte algae have undergone a particularly large number of photosynthesis losses. Here, we present a plastid genome sequence from a nonphotosynthetic chrysophyte, &quot;Spumella&quot; sp. NIES-1846, and show that it has retained a nearly identical set of plastid-encoded functions as apicomplexan parasites. Our transcriptomic analysis of 12 different photosynthetic and nonphotosynthetic chrysophyte lineages reveals remarkable convergence in the functions of these nonphotosynthetic plastids, along with informative lineage-specific retentions and losses. At one extreme, Cornospumella fuschlensis retains many photosynthesis-associated proteins, although it appears to have lost the reductive pentose phosphate pathway and most plastid amino acid metabolism pathways. At the other extreme, Paraphysomonas lacks plastid-targeted proteins associated with gene expression and all metabolic pathways that require plastid-encoded partners, indicating a complete loss of plastid DNA in this genus. Intriguingly, some of the nucleus-encoded proteins that once functioned in the expression of the Paraphysomonas plastid genome have been retained. These proteins were likely to have been dual targeted to the plastid and mitochondria of the chrysophyte ancestor, and are uniquely targeted to the mitochondria in Paraphysomonas Our comparative analyses provide insights into the process of functional reduction in nonphotosynthetic plastids.}, }
@article {pmid30862038, year = {2019}, author = {Le Vasseur, M and Chen, VC and Huang, K and Vogl, WA and Naus, CC}, title = {Pannexin 2 Localizes at ER-Mitochondria Contact Sites.}, journal = {Cancers}, volume = {11}, number = {3}, pages = {}, doi = {10.3390/cancers11030343}, pmid = {30862038}, issn = {2072-6694}, support = {RGPIN-2016-05471//Natural Sciences and Engineering Research Council of Canada/ ; }, abstract = {Endomembrane specialization allows functional compartmentalization but imposes physical constraints to information flow within the cell. However, the evolution of an endomembrane system was associated with the emergence of contact sites facilitating communication between membrane-bound organelles. Contact sites between the endoplasmic reticulum (ER) and mitochondria are highly conserved in terms of their morphological features but show surprising molecular diversity within and across eukaryote species. ER-mitochondria contact sites are thought to regulate key processes in oncogenesis but their molecular composition remains poorly characterized in mammalian cells. In this study, we investigate the localization of pannexin 2 (Panx2), a membrane channel protein showing tumor-suppressing properties in cancer cells. Using a combination of subcellular fractionation, particle tracking in live-cell, and immunogold electron microscopy, we show that Panx2 localizes at ER-mitochondria contact sites in mammalian cells and sensitizes cells to apoptotic stimuli.}, }
@article {pmid30854477, year = {2019}, author = {Oldenkott, B and Yang, Y and Lesch, E and Knoop, V and Schallenberg-Rüdinger, M}, title = {Plant-type pentatricopeptide repeat proteins with a DYW domain drive C-to-U RNA editing in Escherichia coli.}, journal = {Communications biology}, volume = {2}, number = {}, pages = {85}, doi = {10.1038/s42003-019-0328-3}, pmid = {30854477}, issn = {2399-3642}, abstract = {RNA editing converting cytidines into uridines is a hallmark of gene expression in land plant chloroplasts and mitochondria. Pentatricopeptide repeat (PPR) proteins have a key role in target recognition, but the functional editosome in the plant organelles has remained elusive. Here we show that individual Physcomitrella patens DYW-type PPR proteins alone can perform efficient C-to-U editing in Escherichia coli reproducing the moss mitochondrial editing. Single amino acid exchanges in the DYW domain abolish RNA editing, confirming it as the functional cytidine deaminase. The modification of RNA targets and the identification of numerous off-targets in the E. coli transcriptome reveal nucleotide identities critical for RNA recognition and cytidine conversion. The straightforward amenability of the new E. coli setup will accelerate future studies on RNA target recognition through PPRs, on the C-to-U editing deamination machinery and towards future establishment of transcript editing in other genetic systems.}, }
@article {pmid30853974, year = {2019}, author = {Telschow, A and Gadau, J and Werren, JH and Kobayashi, Y}, title = {Genetic Incompatibilities Between Mitochondria and Nuclear Genes: Effect on Gene Flow and Speciation.}, journal = {Frontiers in genetics}, volume = {10}, number = {}, pages = {62}, doi = {10.3389/fgene.2019.00062}, pmid = {30853974}, issn = {1664-8021}, abstract = {The process of speciation is, according to the biological species concept, the reduction in gene flow between genetically diverging populations. Most of the previous theoretical studies analyzed the effect of nuclear genetic incompatibilities on gene flow. There is, however, an increasing number of empirical examples suggesting that cytoplasmically inherited genetic elements play an important role in speciation. Here, we present a theoretical analysis of mitochondrial driven speciation, in which genetic incompatibilities occur between mitochondrial haplotypes and nuclear alleles. Four population genetic models with mainland-island structure were analyzed that differ with respect to the type of incompatibility and the underlying genetics. Gene flow reduction was measured on selectively neutral alleles of an unlinked locus and quantified by the effective migration rate. Analytical formulae for the different scenarios were derived using the fitness graph method. For the models with haploid genetics, we found that mito-nuclear incompatibilities (MtNI) are as strong as nuclear-nuclear incompatibilities (NNI) in reducing gene flow at the unlinked locus, but only if males and females migrate in equal number. For models with diploid genetics, we found that MtNI reduce gene flow stronger than NNI when incompatibilities are recessive, but weaker when they are dominant. For both haploid and diploid MtNI, we found that gene flow reduction is stronger if females are the migrating sex, but weaker than NNI when males are the migrating sex. These results encourage further examination on the role of mitochondria on genetic divergence and speciation and point toward specific factors (e.g., migrating sex) that could be the focus of an empirical test.}, }
@article {pmid30848125, year = {2019}, author = {Han, Y and Branon, TC and Martell, JD and Boassa, D and Shechner, D and Ellisman, MH and Ting, A}, title = {Directed Evolution of Split APEX2 Peroxidase.}, journal = {ACS chemical biology}, volume = {}, number = {}, pages = {}, doi = {10.1021/acschembio.8b00919}, pmid = {30848125}, issn = {1554-8937}, support = {P41 GM103412/GM/NIGMS NIH HHS/United States ; R01 GM086197/GM/NIGMS NIH HHS/United States ; }, abstract = {APEX is an engineered peroxidase that catalyzes the oxidation of a wide range of substrates, facilitating its use in a variety of applications from subcellular staining for electron microscopy to proximity biotinylation for spatial proteomics and transcriptomics. To further advance the capabilities of APEX, we used directed evolution to engineer a split APEX tool (sAPEX). A total of 20 rounds of fluorescence activated cell sorting (FACS)-based selections from yeast-displayed fragment libraries, using 3 different surface display configurations, produced a 200-amino-acid N-terminal fragment (with 9 mutations relative to APEX2) called &quot;AP&quot; and a 50-amino-acid C-terminal fragment called &quot;EX&quot;. AP and EX fragments were each inactive on their own but were reconstituted to give peroxidase activity when driven together by a molecular interaction. We demonstrate sAPEX reconstitution in the mammalian cytosol, on engineered RNA motifs within a non-coding RNA scaffold, and at mitochondria-endoplasmic reticulum contact sites.}, }
@article {pmid30844054, year = {2019}, author = {Thairu, MW and Hansen, AK}, title = {It's a small, small world: Unravelling the role and evolution of small RNAs in organelle and endosymbiont genomes.}, journal = {FEMS microbiology letters}, volume = {}, number = {}, pages = {}, doi = {10.1093/femsle/fnz049}, pmid = {30844054}, issn = {1574-6968}, abstract = {Organelles and host-restricted bacterial symbionts are characterized by having highly reduced genomes that lack many key regulatory genes and elements. Thus, it has been hypothesized that the eukaryotic nuclear genome is primarily responsible for regulating these symbioses. However, with the discovery of organelle and symbiont expressed small RNAs (sRNAs) there is emerging evidence that these sRNAs may play a role in gene regulation as well. Here, we compare the diversity of organelle and bacterial symbiont sRNAs recently identified using genome-enabled '-omic' technologies and discuss their potential role in gene regulation. We also discuss how the genome architecture of small genomes may influence the evolution of these sRNAs and their potential function. Additionally, these new studies suggest that some sRNAs are conserved within organelle and symbiont taxa and respond to changes in the environment and/or their hosts. In summary, these results suggest that organelle and symbiont sRNAs may play a role in gene regulation in addition to nuclear-encoded host mechanisms.}, }
@article {pmid30842567, year = {2019}, author = {Matos, I and Machado, MP and Schartl, M and Coelho, MM}, title = {Allele-specific expression variation at different ploidy levels in Squalius alburnoides.}, journal = {Scientific reports}, volume = {9}, number = {1}, pages = {3688}, doi = {10.1038/s41598-019-40210-8}, pmid = {30842567}, issn = {2045-2322}, support = {SFRH/BD/61217/2009//Minist&amp;#x00E9;rio da Educa&amp;#x00E7;&amp;#x00E3;o e Ci&amp;#x00EA;ncia (Ministry of Education and Science)/ ; UID/BIA/00329/2013//Ministry of Education and Science | Funda&amp;#x00E7;&amp;#x00E3;o para a Ci&amp;#x00EA;ncia e a Tecnologia (Portuguese Science and Technology Foundation)/ ; }, abstract = {Allopolyploid plants are long known to be subject to a homoeolog expression bias of varying degree. The same phenomenon was only much later suspected to occur also in animals based on studies of single selected genes in an allopolyploid vertebrate, the Iberian fish Squalius alburnoides. Consequently, this species became a good model for understanding the evolution of gene expression regulation in polyploid vertebrates. Here, we analyzed for the first time genome-wide allele-specific expression data from diploid and triploid hybrids of S. alburnoides and compared homoeolog expression profiles of adult livers and of juveniles. Co-expression of alleles from both parental genomic types was observed for the majority of genes, but with marked homoeolog expression bias, suggesting homoeolog specific reshaping of expression level patterns in hybrids. Complete silencing of one allele was also observed irrespective of ploidy level, but not transcriptome wide as previously speculated. Instead, it was found only in a restricted number of genes, particularly ones with functions related to mitochondria and ribosomes. This leads us to hypothesize that allelic silencing may be a way to overcome intergenomic gene expression interaction conflicts, and that homoeolog expression bias may be an important mechanism in the achievement of sustainable genomic interactions, mandatory to the success of allopolyploid systems, as in S. alburnoides.}, }
@article {pmid30838029, year = {2019}, author = {Dixit, S and Henderson, JC and Alfonzo, JD}, title = {Multi-Substrate Specificity and the Evolutionary Basis for Interdependence in tRNA Editing and Methylation Enzymes.}, journal = {Frontiers in genetics}, volume = {10}, number = {}, pages = {104}, doi = {10.3389/fgene.2019.00104}, pmid = {30838029}, issn = {1664-8021}, support = {R56 AI131248/AI/NIAID NIH HHS/United States ; }, abstract = {Among tRNA modification enzymes there is a correlation between specificity for multiple tRNA substrates and heteromultimerization. In general, enzymes that modify a conserved residue in different tRNA sequences adopt a heterodimeric structure. Presumably, such changes in the oligomeric state of enzymes, to gain multi-substrate recognition, are driven by the need to accommodate and catalyze a particular reaction in different substrates while maintaining high specificity. This review focuses on two classes of enzymes where the case for multimerization as a way to diversify molecular recognition can be made. We will highlight several new themes with tRNA methyltransferases and will also discuss recent findings with tRNA editing deaminases. These topics will be discussed in the context of several mechanisms by which heterodimerization may have been achieved during evolution and how these mechanisms might impact modifications in different systems.}, }
@article {pmid30824066, year = {2019}, author = {Forgione, I and Bonavita, S and Regina, TMR}, title = {Mitochondria of Cedrus atlantica and allied species: A new chapter in the horizontal gene transfer history.}, journal = {Plant science : an international journal of experimental plant biology}, volume = {281}, number = {}, pages = {93-101}, doi = {10.1016/j.plantsci.2019.01.013}, pmid = {30824066}, issn = {1873-2259}, mesh = {Cedrus/*genetics ; Gene Transfer, Horizontal/*genetics ; Genome, Mitochondrial/*genetics ; Ribosomal Proteins/*genetics ; }, abstract = {The extraordinary incidence of Horizontal Gene Transfer (HGT) mostly in mitochondrial genomes of flowering plants is well known. Here, we report another episode of HGT affecting a large mitochondrial gene region in the evergreen conifer Atlas cedar (Cedrus atlantica). Mitochondria of this Pinaceae species possess an rps3 gene that harbours two introns and shares the same genomic context with a downstream overlapping rpl16 gene, like in the major groups of gymnosperms and angiosperms analyzed so far. Interestingly, C. atlantica contains additional copies of the rps3 and rpl16 sequences that are more closely related to angiosperm counterparts than to those from gymnosperms, as also confirmed by phylogenetic analyses. This suggests that a lateral transfer from a flowering plant donor is the most likely mechanism for the origin of the Atlas cedar extra sequences. Quantitative PCR and reverse-transcription (RT)-PCR analyses demonstrate, respectively, mitochondrial location and lack of expression for the rps3 and rpl16 additional sequences in C. atlantica. Furthermore, our study provides evidence that a similar HGT event takes place in two other Cedrus species, which occurr in Cyprus and North Africa. Only the West Himalayan C. deodara lacks the transferred genes. The potential donor and the molecular mechanism underlying this lateral DNA transfer remain still unclear.}, }
@article {pmid30813887, year = {2019}, author = {Kuzminkova, AA and Sokol, AD and Ushakova, KE and Popadin, KY and Gunbin, KV}, title = {mtProtEvol: the resource presenting molecular evolution analysis of proteins involved in the function of Vertebrate mitochondria.}, journal = {BMC evolutionary biology}, volume = {19}, number = {Suppl 1}, pages = {47}, doi = {10.1186/s12862-019-1371-x}, pmid = {30813887}, issn = {1471-2148}, abstract = {BACKGROUND: Heterotachy is the variation in the evolutionary rate of aligned sites in different parts of the phylogenetic tree. It occurs mainly due to epistatic interactions among the substitutions, which are highly complex and make it difficult to study protein evolution. The vast majority of computational evolutionary approaches for studying these epistatic interactions or their evolutionary consequences in proteins require high computational time. However, recently, it has been shown that the evolution of residue solvent accessibility (RSA) is tightly linked with changes in protein fitness and intra-protein epistatic interactions. This provides a computationally fast alternative, based on comparison of evolutionary rates of amino acid replacements with the rates of RSA evolutionary changes in order to recognize any shifts in epistatic interaction.<br><br>RESULTS: Based on RSA information, data randomization and phylogenetic approaches, we constructed a software pipeline, which can be used to analyze the evolutionary consequences of intra-protein epistatic interactions with relatively low computational time. We analyzed the evolution of 512 protein families tightly linked to mitochondrial function in Vertebrates and created &quot;mtProtEvol&quot;, the web resource with data on protein evolution. In strict agreement with lifespan and metabolic rate data, we demonstrated that different functional categories of mitochondria-related proteins subjected to selection on accelerated and decelerated RSA rates in rodents and primates. For example, accelerated RSA evolution in rodents has been shown for Krebs cycle enzymes, respiratory chain and reactive oxygen species metabolism, while in primates these functions are stress-response, translation and mtDNA integrity. Decelerated RSA evolution in rodents has been demonstrated for translational machinery and oxidative stress response components.<br><br>CONCLUSIONS: mtProtEvol is an interactive resource focused on evolutionary analysis of epistatic interactions in protein families involved in Vertebrata mitochondria function and available at http://bioinfodbs.kantiana.ru/mtProtEvol /. This resource and the devised software pipeline may be useful tool for researchers in area of protein evolution.}, }
@article {pmid30809302, year = {2019}, author = {Tan, Y and Zhu, Y and Wen, L and Yang, X and Liu, X and Meng, T and Dai, S and Ping, Y and Yuan, H and Hu, F}, title = {Mitochondria-Responsive Drug Release along with Heat Shock Mediated by Multifunctional Glycolipid Micelles for Precise Cancer Chemo-Phototherapy.}, journal = {Theranostics}, volume = {9}, number = {3}, pages = {691-707}, doi = {10.7150/thno.31022}, pmid = {30809302}, issn = {1838-7640}, abstract = {Responsive drug release in tumor mitochondria is a pre-requisite for mitochondria-targeted drug delivery systems to improve the efficacy of this promising therapeutic modality. To this end, a photothermal stimulation strategy for mitochondria-responsive drug release along with heat shock is developed to maximize the antitumor effects with minimal side effects. Methods: This strategy relies on mitochondrial-targeted delivery of doxorubicin (DOX) through a photothermal and lipophilic agent IR-780 iodide (IR780)-modified glycolipid conjugates (CSOSA), which can synergistically triggers high-level reactive oxygen species (ROS) to kill tumor cells. Results: Specifically, upon laser irradiation, the photothermal conversion by IR780-CSOSA can not only weaken the hydrophobic interaction between the core of micelles and DOX and trigger unexpected micelle swelling to release DOX in mitochondria for the amplification of ROS, but also induce mitochondria-specific heat shock to promote the fast evolution of ROS at the same locus to eradicate cancer cells in a more effective way. Furthermore, IR780-CSOSA micelles may independently realize the real-time diagnosis and imaging on multiple tumor models. Deep penetration into tumors by IR780-CSOSA/DOX micelles can be manipulated under laser irradiation. Conclusion: Such multifunctional IR780-CSOSA/DOX micelles with integration of mitochondria-responsive drug release and heat shock are demonstrated to be superior to the non-mitochondria-responsive therapy. This study opens up new avenues for the future cancer diagnosis and treatment.}, }
@article {pmid30809252, year = {2019}, author = {Hirata, A}, title = {Recent Insights Into the Structure, Function, and Evolution of the RNA-Splicing Endonucleases.}, journal = {Frontiers in genetics}, volume = {10}, number = {}, pages = {103}, doi = {10.3389/fgene.2019.00103}, pmid = {30809252}, issn = {1664-8021}, abstract = {RNA-splicing endonuclease (EndA) cleaves out introns from archaeal and eukaryotic precursor (pre)-tRNA and is essential for tRNA maturation. In archaeal EndA, the molecular mechanisms underlying complex assembly, substrate recognition, and catalysis have been well understood. Recently, certain studies have reported novel findings including the identification of new subunit types in archaeal EndA structures, providing insights into the mechanism underlying broad substrate specificity. Further, metagenomics analyses have enabled the acquisition of numerous DNA sequences of EndAs and intron-containing pre-tRNAs from various species, providing information regarding the co-evolution of substrate specificity of archaeal EndAs and tRNA genetic diversity, and the evolutionary pathway of archaeal and eukaryotic EndAs. Although the complex structure of the heterothermic form of eukaryotic EndAs is unknown, previous reports regarding their functions indicated that mutations in human EndA cause neurological disorders including pontocerebellar hypoplasia and progressive microcephaly, and yeast EndA significantly cleaves mitochondria-localized mRNA encoding cytochrome b mRNA processing 1 (Cpb1) for mRNA maturation. This mini-review summarizes the aforementioned results, discusses their implications, and offers my personal opinion regarding future directions for the analysis of the structure and function of EndAs.}, }
@article {pmid30804878, year = {2019}, author = {Festoff, BW and Citron, BA}, title = {Thrombin and the Coag-Inflammatory Nexus in Neurotrauma, ALS, and Other Neurodegenerative Disorders.}, journal = {Frontiers in neurology}, volume = {10}, number = {}, pages = {59}, doi = {10.3389/fneur.2019.00059}, pmid = {30804878}, issn = {1664-2295}, abstract = {This review details our current understanding of thrombin signaling in neurodegeneration, with a focus on amyotrophic lateral sclerosis (ALS, Lou Gehrig's disease) as well as future directions to be pursued. The key factors are multifunctional and involved in regulatory pathways, namely innate immune and the coagulation cascade activation, that are essential for normal nervous system function and health. These two major host defense systems have a long history in evolution and include elements and regulators of the coagulation pathway that have significant impacts on both the peripheral and central nervous system in health and disease. The clotting cascade responds to a variety of insults to the CNS including injury and infection. The blood brain barrier is affected by these responses and its compromise also contributes to these detrimental effects. Important molecules in signaling that contribute to or protect against neurodegeneration include thrombin, thrombomodulin (TM), protease activated receptor 1 (PAR1), damage associated molecular patterns (DAMPs), such as high mobility group box protein 1 (HMGB1) and those released from mitochondria (mtDAMPs). Each of these molecules are entangled in choices dependent upon specific signaling pathways in play. For example, the particular cleavage of PAR1 by thrombin vs. activated protein C (APC) will have downstream effects through coupled factors to result in toxicity or neuroprotection. Furthermore, numerous interactions influence these choices such as the interplay between HMGB1, thrombin, and TM. Our hope is that improved understanding of the ways that components of the coagulation cascade affect innate immune inflammatory responses and influence the course of neurodegeneration, especially after injury, will lead to effective therapeutic approaches for ALS, traumatic brain injury, and other neurodegenerative disorders.}, }
@article {pmid30804213, year = {2019}, author = {Tang, K and Li, Y and Yu, C and Wei, Z}, title = {Structural mechanism for versatile cargo recognition by the yeast class V myosin Myo2.}, journal = {The Journal of biological chemistry}, volume = {}, number = {}, pages = {}, doi = {10.1074/jbc.RA119.007550}, pmid = {30804213}, issn = {1083-351X}, abstract = {Class V myosins are actin-dependent motors, which recognize numerous cellular cargos mainly via the C-terminal globular tail domain (GTD). Myo2, a yeast class V myosin, can transport a broad range of organelles. However, little is known about the capacity of Myo2-GTD to recognize such a diverse array of cargos specifically at the molecular level. Here, we solved crystal structures of Myo2-GTD (at 1.9-3.1 Å resolutions) in complex with three cargo adaptor proteins: Smy1 (for polarization of secretory vesicles), Inp2 (for peroxisome transport), and Mmr1 (for mitochondria transport). The structures of Smy1- and Inp2-bound Myo2-GTD, along with site-directed mutagenesis experiments, revealed a binding site in the subdomain-I having a hydrophobic groove with high flexibility enabling Myo2-GTD to accommodate different protein sequence. The Myo2-GTD-Mmr1 complex structure confirmed and complemented a previously identified mitochondrion/vacuole-specific binding region. Moreover, differences between the conformations and locations of cargo-binding sites identified here for Myo2 and those reported for mammalian MyoVA (MyoVA) suggest that class V myosins potentially have co-evolved with their specific cargos. Our structural and biochemical analysis not only uncovers a molecular mechanism that explains the diverse cargo recognition by Myo2-GTD, but also provides structural information useful for future functional studies of class V myosins in cargo transport.}, }
@article {pmid30785203, year = {2019}, author = {Yan, Z and Ye, G and Werren, JH}, title = {Evolutionary rate correlation between mitochondrial-encoded and mitochondria-associated nuclear-encoded proteins in insects.}, journal = {Molecular biology and evolution}, volume = {}, number = {}, pages = {}, doi = {10.1093/molbev/msz036}, pmid = {30785203}, issn = {1537-1719}, abstract = {The mitochondrion is a pivotal organelle for energy production, and includes components encoded by both the mitochondrial and nuclear genomes. Functional and evolutionary interactions are expected between the nuclear and mitochondrial encoded components. The topic is of broad interest in biology, with implications to genetics, evolution, and medicine. Here we compare the evolutionary rates of mitochondrial proteins and ribosomal RNAs to rates of mitochondria-associated nuclear-encoded proteins, across the major orders of holometabolous insects. There are significant evolutionary rate correlations (ERCs) between mitochondrial-encoded and mitochondria-associated nuclear-encoded proteins, which is likely driven by different rates of mitochondrial sequence evolution and correlated changes in the interacting nuclear-encoded proteins. The pattern holds after correction for phylogenetic relationships and considering protein conservation levels. Correlations are stronger for both nuclear-encoded OXPHOS proteins that are in contact with mitochondrial OXPHOS proteins and for nuclear-encoded mitochondrial ribosomal amino acids directly contacting the mitochondrial rRNAs. We find that ERC between mitochondrial- and nuclear-encoded proteins is a strong predictor of nuclear-encoded proteins known to interact with mitochondria, and ERC shows promise for identifying new candidate proteins with mitochondrial function. Twenty-three additional candidate nuclear-encoded proteins warrant further study for mitochondrial function based on this approach, including proteins in the minichromosome maintenance helicase (MCM) complex.}, }
@article {pmid30771209, year = {2019}, author = {Shin, MK and Cheong, JH}, title = {Mitochondria-centric bioenergetic characteristics in cancer stem-like cells.}, journal = {Archives of pharmacal research}, volume = {42}, number = {2}, pages = {113-127}, doi = {10.1007/s12272-019-01127-y}, pmid = {30771209}, issn = {0253-6269}, support = {1020390//Ministry of Health and Welfare/ ; 1320360//Ministry of Health and Welfare/ ; NRF-2017R1D1A1B03032553//National Research Fund, Republic of Korea/ ; 6-2007-0095//Yonsei University College of Medicine/ ; 6-2008-0193//Yonsei University College of Medicine/ ; }, abstract = {Metabolic and genotoxic stresses that arise during tumor progression and anti-cancer treatment, respectively, can impose a selective pressure to promote cancer evolution in the tumor microenvironment. This process ultimately selects for the most &quot;fit&quot; clones, which generally have a cancer stem cell like phenotype with features of drug resistance, epithelial-mesenchymal transition, invasiveness, and high metastatic potential. From a bioenergetics perspective, these cancer stem-like cells (CSCs) exhibit mitochondria-centric energy metabolism and are capable of opportunistically utilizing available nutrients such as fatty acids to generate ATP and other metabolic substances, providing a selective advantage for their survival in an impermissible environment and metabolic context. Thus, diverse therapeutic strategies are needed to efficiently tackle these CSCs and eliminate their advantage. Here, we review the metabolic and bioenergetic characteristics and vulnerabilities specific to CSCs, which can provide an unprecedented opportunity to curb CSC-driven cancer mortality rates. We particularly focus on the potential of a CSC bioenergetics-targeted strategy as a versatile therapeutic component of treatment modalities applicable to most cancer types. A cancer bioenergetics-targeted strategy can expand the inventory of combinatorial regimens in the current anti-cancer armamentarium.}, }
@article {pmid30760198, year = {2019}, author = {Pinard, D and Myburg, AA and Mizrachi, E}, title = {The plastid and mitochondrial genomes of Eucalyptus grandis.}, journal = {BMC genomics}, volume = {20}, number = {1}, pages = {132}, doi = {10.1186/s12864-019-5444-4}, pmid = {30760198}, issn = {1471-2164}, support = {97911//National Research Foundation/ ; 86936//Department of Science and Technology, Republic of South Africa/ ; }, abstract = {BACKGROUND: Land plant organellar genomes have significant impact on metabolism and adaptation, and as such, accurate assembly and annotation of plant organellar genomes is an important tool in understanding the evolutionary history and interactions between these genomes. Intracellular DNA transfer is ongoing between the nuclear and organellar genomes, and can lead to significant genomic variation between, and within, species that impacts downstream analysis of genomes and transcriptomes.<br><br>RESULTS: In order to facilitate further studies of cytonuclear interactions in Eucalyptus, we report an updated annotation of the E. grandis plastid genome, and the second sequenced and annotated mitochondrial genome of the Myrtales, that of E. grandis. The 478,813 bp mitochondrial genome shows the conserved protein coding regions and gene order rearrangements typical of land plants. There have been widespread insertions of organellar DNA into the E. grandis nuclear genome, which span 141 annotated nuclear genes. Further, we identify predicted editing sites to allow for the discrimination of RNA-sequencing reads between nuclear and organellar gene copies, finding that nuclear copies of organellar genes are not expressed in E. grandis.<br><br>CONCLUSIONS: The implications of organellar DNA transfer to the nucleus are often ignored, despite the insight they can give into the ongoing evolution of plant genomes, and the problems they can cause in many applications of genomics. Future comparisons of the transcription and regulation of organellar genes between Eucalyptus genotypes may provide insight to the cytonuclear interactions that impact economically important traits in this widely grown lignocellulosic crop species.}, }
@article {pmid30759299, year = {2019}, author = {Kaila, T and Saxena, S and Ramakrishna, G and Tyagi, A and Tribhuvan, KU and Srivastava, H and Sandhya,  and Chaudhury, A and Singh, NK and Gaikwad, K}, title = {Comparative RNA editing profile of mitochondrial transcripts in cytoplasmic male sterile and fertile pigeonpea reveal significant changes at the protein level.}, journal = {Molecular biology reports}, volume = {46}, number = {2}, pages = {2067-2084}, doi = {10.1007/s11033-019-04657-2}, pmid = {30759299}, issn = {1573-4978}, abstract = {RNA editing is a process which leads to post-transcriptional alteration of the nucleotide sequence of the corresponding mRNA molecule which may or may not lead to changes at the protein level. Apart from its role in providing variability at the transcript and protein levels, sometimes, such changes may lead to abnormal expression of the mitochondrial gene leading to a cytoplasmic male sterile phenotype. Here we report the editing status of 20 major mitochondrial transcripts in both male sterile (AKCMS11) and male fertile (AKPR303) pigeonpea genotypes. The validation of the predicted editing sites was done by mapping RNA-seq reads onto the amplified mitochondrial genes, and 165 and 159 editing sites were observed in bud tissues of the male sterile and fertile plant respectively. Among the resulting amino acid alterations, the most frequent one was the conversion of hydrophilic amino acids to hydrophobic. The alterations thus detected in our study indicates differential editing, but no major change in terms of the abnormal protein structure was detected. However, the above investigation provides an insight into the behaviour of pigeonpea mitochondrial genome in native and alloplasmic state and could hold clues in identification of editing factors and their role in adaptive evolution in pigeonpea.}, }
@article {pmid30753430, year = {2019}, author = {Hein, A and Brenner, S and Knoop, V}, title = {Multifarious Evolutionary Pathways of a Nuclear RNA Editing Factor: Disjunctions in Coevolution of DOT4 and Its Chloroplast Target rpoC1eU488SL.}, journal = {Genome biology and evolution}, volume = {11}, number = {3}, pages = {798-813}, doi = {10.1093/gbe/evz032}, pmid = {30753430}, issn = {1759-6653}, abstract = {Nuclear-encoded pentatricopeptide repeat (PPR) proteins are site-specific factors for C-to-U RNA editing in plant organelles coevolving with their targets. Losing an editing target by C-to-T conversion allows for eventual loss of its editing factor, as recently confirmed for editing factors CLB19, CRR28, and RARE1 targeting ancient chloroplast editing sites in flowering plants. Here, we report on alternative evolutionary pathways for DOT4 addressing rpoC1eU488SL, a chloroplast editing site in the RNA polymerase β' subunit mRNA. Upon loss of rpoC1eU488SL by C-to-T conversion, DOT4 got lost multiple times independently in angiosperm evolution with intermediate states of DOT4 orthologs in various stages of degeneration. Surprisingly, we now also observe degeneration and loss of DOT4 despite retention of a C in the editing position (in Carica, Coffea, Vicia, and Spirodela). We find that the cytidine remains unedited, proving that DOT4 was not replaced by another editing factor. Yet another pathway of DOT4 evolution is observed among the Poaceae. Although the rpoC1eU488SL edit has been lost through C-to-T conversion, DOT4 orthologs not only remain conserved but also have their array of PPRs extended by six additional repeats. Here, the loss of the ancient target has likely allowed DOT4 to adapt for a new function. We suggest rps3 antisense transcripts as previously demonstrated in barley (Hordeum vulgare) arising from promotor sequences newly emerging in the rpl16 intron of Poaceae as a new candidate target for the extended PPR stretch of DOT4. Altogether, DOT4 and its target show more flexible pathways for evolution than the previously explored editing factors CLB19, CRR28, and RARE1. Certain plant clades (e.g., Amaranthus, Vaccinium, Carica, the Poaceae, Fabales, and Caryophyllales) show pronounced dynamics in the evolution of editing sites and corresponding factors.}, }
@article {pmid30742851, year = {2019}, author = {Teng, H and Wang, D and Lu, J and Zhou, Y and Pang, Y and Li, Q}, title = {Novel insights into the evolution of the caveolin superfamily and mechanisms of antiapoptotic effects and cell proliferation in lamprey.}, journal = {Developmental and comparative immunology}, volume = {95}, number = {}, pages = {118-128}, doi = {10.1016/j.dci.2019.01.005}, pmid = {30742851}, issn = {1879-0089}, abstract = {Caveolin-1 is the main structural and functional component of caveolin, and it is involved in the regulation of cholesterol transport, endocytosis, and signal transduction. Moreover, changes in caveolin-1 play an important role in tumorigenesis and inflammatory processes. Previous studies have demonstrated that human caveolin-1 is mainly located in the cell membrane and exhibits cell type- and stage-dependent functional differences during cancer development and inflammatory responses. However, the role of Lamprey-caveolin-like (L-caveolin-like) in lamprey remained unknown. Here, we demonstrated that L-caveolin-like performs anti-inflammation and oncogenic functions and the function of caveolin-1 diverged during vertebrate evolution. Moreover, the results reveal the mechanism underlying the antiapoptotic effects of L-caveolin-like. An L-caveolin-like gene from Lampetra japonica (L. japonica) was identified and characterized. L-Caveolin-like was primarily distributed in the leukocytes, intestines and supraneural bodies (Sp-bodies) immune organs as indicated by Q-PCR and immunohistochemistry assays. The mRNA and protein expression levels of L-caveolin exhibited consistent increases in expression at 2 and 72 h in adult tissues after exposure to lipopolysaccharide (LPS) and in leukocytes stimulated by Vibrio anguillarum (V. anguillarum), Staphylococcus aureus (S. aureus), and Poly I:C. Furthermore, the overexpression of pEGFP-N1-L-caveolin-like was associated with a distinct localization in mitochondria, with decreased cytochrome C (Cyt C) and mitochondrial Cyt C oxidase subunit I (CO I) expression. In addition, increased cellular ATP levels suggested that this protein prevented mitochondrial damage. The overexpression of pEGFP-N1-L-caveolin-like led to the altered expression of factors related to apoptosis, such as decreased Caspase-9, Caspase-3, p53, and Bax expression and increased Bcl-2 expression. In addition, the overexpression of pEGFP-N1-L-caveolin-like promoted cell proliferation associated with upregulated EGF, bFGF, and PDGFB expression. Together, these findings indicated that the L-caveolin-like protein from L. japonica induced the activation of antiapoptotic effects via the mitochondrial Cyt C-mediated Caspase-3 signaling pathway. Our analysis further suggests that L-caveolin-like is an oncogene protein product and anti-inflammatory molecule from lamprey that evolved early in vertebrate evolution.}, }
@article {pmid30740458, year = {2019}, author = {Oborník, M}, title = {In the beginning was the word: How terminology drives our understanding of endosymbiotic organelles.}, journal = {Microbial cell (Graz, Austria)}, volume = {6}, number = {2}, pages = {134-141}, doi = {10.15698/mic2019.02.669}, pmid = {30740458}, issn = {2311-2638}, abstract = {The names we give objects of research, to some extent, predispose our ways of thinking about them. Misclassifications of Oomycota, Microsporidia, Myxosporidia, and Helicosporidia have obviously affected not only their formal taxonomic names, but also the methods and approaches with which they have been investigated. Therefore, it is important to name biological entities with accurate terms in order to avoid discrepancies in researching them. The endosymbiotic origin of mitochondria and plastids is now the most accepted scenario for their evolution. Since it is apparent that there is no natural definitive border between bacteria and semiautonomous organelles, I propose that mitochondria and plastids should be called bacteria and classified accordingly, in the bacterial classification system. I discuss some consequences of this approach, including: i) the resulting &quot;changes&quot; in the abundances of bacteria, ii) the definitions of terms like microbiome or multicellularity, and iii) the concept of endosymbiotic domestication.}, }
@article {pmid30740457, year = {2019}, author = {Gruber, A}, title = {What's in a name? How organelles of endosymbiotic origin can be distinguished from endosymbionts.}, journal = {Microbial cell (Graz, Austria)}, volume = {6}, number = {2}, pages = {123-133}, doi = {10.15698/mic2019.02.668}, pmid = {30740457}, issn = {2311-2638}, abstract = {Mitochondria and plastids evolved from free-living bacteria, but are now considered integral parts of the eukaryotic species in which they live. Therefore, they are implicitly called by the same eukaryotic species name. Historically, mitochondria and plastids were known as &quot;organelles&quot;, even before their bacterial origin became fully established. However, since organelle evolution by endosymbiosis has become an established theory in biology, more and more endosymbiotic systems have been discovered that show various levels of host/symbiont integration. In this context, the distinction between &quot;host/symbiont&quot; and &quot;eukaryote/organelle&quot; systems is currently unclear. The criteria that are commonly considered are genetic integration (via gene transfer from the endosymbiont to the nucleus), cellular integration (synchronization of the cell cycles), and metabolic integration (the mutual dependency of the metabolisms). Here, I suggest that these criteria should be evaluated according to the resulting coupling of genetic recombination between individuals and congruence of effective population sizes, which determines if independent speciation is possible for either of the partners. I would like to call this aspect of integration &quot;sexual symbiont integration&quot;. If the partners lose their independence in speciation, I think that they should be considered one species. The partner who maintains its genetic recombination mechanisms and life cycle should then be the name giving &quot;host&quot;; the other one would be the organelle. Distinguishing between organelles and symbionts according to their sexual symbiont integration is independent of any particular mechanism or structural property of the endosymbiont/host system under investigation.}, }
@article {pmid30738095, year = {2019}, author = {Gong, L and Jiang, H and Zhu, K and Lu, X and Liu, L and Liu, B and Jiang, L and Ye, Y and Lü, Z}, title = {Large-scale mitochondrial gene rearrangements in the hermit crab Pagurus nigrofascia and phylogenetic analysis of the Anomura.}, journal = {Gene}, volume = {695}, number = {}, pages = {75-83}, doi = {10.1016/j.gene.2019.01.035}, pmid = {30738095}, issn = {1879-0038}, mesh = {Animals ; Anomura/*genetics ; DNA, Mitochondrial/genetics ; *Evolution, Molecular ; Gene Rearrangement/genetics ; Genome, Mitochondrial/*genetics ; Mitochondria/genetics ; *Phylogeny ; }, abstract = {Complete mitochondrial genome (mitogenome) provides important information for better understanding of gene rearrangement, molecular evolution and phylogenetic analysis. Currently, only a few Paguridae mitogenomes have been reported. Herein, we described the complete mitogenome of hermit crab Pagurus nigrofascia. The total length was 15,423 bp, containing 13 protein-coding genes (PCGs), two ribosomal RNA, 22 transfer RNA genes, as well as an AT-rich region. The genome composition was highly A + T biased (71.4%), and exhibited a negative AT-skew (-0.006) and GC-skew (-0.138). Eight tRNA genes, two PCGs and an AT-rich region found to be rearranged with respect to the pancrustacean ground pattern gene order. Duplication-random loss and recombination model were adopted to explain the large-scale gene rearrangement events. Two phylogenetic trees of Anomura involving 12 families were constructed. The results showed that all Paguridae species were clustered into one clade except Pagurus longicarpus, which for the first time imposed raises doubt about the morphological taxonomy of this species. Furthermore, the present study found that higher- level phylogenetic relationships within Anomura were controversial, compared with the previous studies. Our results help to better understand gene rearrangements and the evolutionary status of P. nigrofascia and lay foundation for further phylogenetic study of Anomura.}, }
@article {pmid30736942, year = {2019}, author = {Hrazdilová, K and Myśliwy, I and Hildebrand, J and Buńkowska-Gawlik, K and Janaczyk, B and Perec-Matysiak, A and Modrý, D}, title = {Paralogs vs. genotypes? Variability of Babesia canis assessed by 18S rDNA and two mitochondrial markers.}, journal = {Veterinary parasitology}, volume = {266}, number = {}, pages = {103-110}, doi = {10.1016/j.vetpar.2018.12.017}, pmid = {30736942}, issn = {1873-2550}, mesh = {Animals ; Babesia/*genetics ; Babesiosis/blood/diagnosis/parasitology ; Cohort Studies ; DNA, Protozoan/genetics ; Dog Diseases/diagnosis/parasitology ; Dogs ; Europe ; Genetic Markers ; *Genetic Variation ; Genome, Protozoan ; *Genotype ; Haplotypes ; Mitochondria/*genetics ; Phylogeny ; RNA, Ribosomal, 18S/*genetics ; Sequence Analysis, DNA ; }, abstract = {Canine babesiosis caused by Babesia canis sensu stricto became an emerging disease of dogs across Europe calling for attention also in countries where it was an only rare imported disease. An easy accessibility of molecular methods and the growing amount of sequencing data led to the description of intraspecific variability in 18S rDNA sequences designated as &quot;genotypes&quot;. Using material from a homogenous cohort of dogs with microscopically confirmed canine babesiosis caused by B. canis, we evaluated Babesia intraspecific variability and amplification sensitivity of three different genes (18S rDNA, COI, Cytb) to assess their potential as diagnostic or phylogenetic markers. In raw sequencing data obtained, we observed at least 3 ambiguous positions in up to 86% of chromatograms within the ∼560 bp fragment of 18S rDNA suggesting the existence of several, not identical copies of this gene. Our COI haplotype analysis resulted in a star-like pattern indicating a recent origin of most haplotypes, but not supporting the existence of two dominant haplotypes. Similarly, the Cytb sequences obtained from samples with all variants of 18S rDNA were identical. We corroborate previous observations from three other European countries and bring the evidence of the existence of 18S rDNA paralogs in B. canis genome replacing currently used &quot;genotype&quot; theory.}, }
@article {pmid30729162, year = {2019}, author = {Li, XC and Peris, D and Hittinger, CT and Sia, EA and Fay, JC}, title = {Mitochondria-encoded genes contribute to evolution of heat and cold tolerance in yeast.}, journal = {Science advances}, volume = {5}, number = {1}, pages = {eaav1848}, doi = {10.1126/sciadv.aav1848}, pmid = {30729162}, issn = {2375-2548}, abstract = {Genetic analysis of phenotypic differences between species is typically limited to interfertile species. Here, we conducted a genome-wide noncomplementation screen to identify genes that contribute to a major difference in thermal growth profile between two reproductively isolated yeast species, Saccharomyces cerevisiae and Saccharomyces uvarum. The screen identified only a single nuclear-encoded gene with a moderate effect on heat tolerance, but, in contrast, revealed a large effect of mitochondrial DNA (mitotype) on both heat and cold tolerance. Recombinant mitotypes indicate that multiple genes contribute to thermal divergence, and we show that protein divergence in COX1 affects both heat and cold tolerance. Our results point to the yeast mitochondrial genome as an evolutionary hotspot for thermal divergence.}, }
@article {pmid30728898, year = {2019}, author = {Speirs, MMP and Swensen, AC and Chan, TY and Jones, PM and Holman, JC and Harris, MB and Maschek, JA and Cox, JE and Carson, RH and Hill, JT and Andersen, JL and Prince, JT and Price, JC}, title = {Imbalanced sphingolipid signaling is maintained as a core proponent of a cancerous phenotype in spite of metabolic pressure and epigenetic drift.}, journal = {Oncotarget}, volume = {10}, number = {4}, pages = {449-479}, doi = {10.18632/oncotarget.26533}, pmid = {30728898}, issn = {1949-2553}, abstract = {Tumor heterogeneity may arise through genetic drift and environmentally driven clonal selection for metabolic fitness. This would promote subpopulations derived from single cancer cells that exhibit distinct phenotypes while conserving vital pro-survival pathways. We aimed to identify significant drivers of cell fitness in pancreatic adenocarcinoma (PDAC) creating subclones in different nutrient formulations to encourage differential metabolic reprogramming. The genetic and phenotypic expression profiles of each subclone were analyzed relative to a healthy control cell line (hTert-HPNE). The subclones exhibited distinct variations in protein expression and lipid metabolism. Relative to hTert-HPNE, PSN-1 subclones uniformly maintained modified sphingolipid signaling and specifically retained elevated sphingosine-1-phosphate (S1P) relative to C16 ceramide (C16 Cer) ratios. Each clone utilized a different perturbation to this pathway, but maintained this modified signaling to preserve cancerous phenotypes, such as rapid proliferation and defense against mitochondria-mediated apoptosis. Although the subclones were unique in their sensitivity, inhibition of S1P synthesis significantly reduced the ratio of S1P/C16 Cer, slowed cell proliferation, and enhanced sensitivity to apoptotic signals. This reliance on S1P signaling identifies this pathway as a promising drug-sensitizing target that may be used to eliminate cancerous cells consistently across uniquely reprogrammed PDAC clones.}, }
@article {pmid30698742, year = {2019}, author = {Noutahi, E and Calderon, V and Blanchette, M and El-Mabrouk, N and Lang, BF}, title = {Rapid Genetic Code Evolution in Green Algal Mitochondrial Genomes.}, journal = {Molecular biology and evolution}, volume = {36}, number = {4}, pages = {766-783}, doi = {10.1093/molbev/msz016}, pmid = {30698742}, issn = {1537-1719}, abstract = {Genetic code deviations involving stop codons have been previously reported in mitochondrial genomes of several green plants (Viridiplantae), most notably chlorophyte algae (Chlorophyta). However, as changes in codon recognition from one amino acid to another are more difficult to infer, such changes might have gone unnoticed in particular lineages with high evolutionary rates that are otherwise prone to codon reassignments. To gain further insight into the evolution of the mitochondrial genetic code in green plants, we have conducted an in-depth study across mtDNAs from 51 green plants (32 chlorophytes and 19 streptophytes). Besides confirming known stop-to-sense reassignments, our study documents the first cases of sense-to-sense codon reassignments in Chlorophyta mtDNAs. In several Sphaeropleales, we report the decoding of AGG codons (normally arginine) as alanine, by tRNA(CCU) of various origins that carry the recognition signature for alanine tRNA synthetase. In Chromochloris, we identify tRNA variants decoding AGG as methionine and the synonymous codon CGG as leucine. Finally, we find strong evidence supporting the decoding of AUA codons (normally isoleucine) as methionine in Pycnococcus. Our results rely on a recently developed conceptual framework (CoreTracker) that predicts codon reassignments based on the disparity between DNA sequence (codons) and the derived protein sequence. These predictions are then validated by an evaluation of tRNA phylogeny, to identify the evolution of new tRNAs via gene duplication and loss, and structural modifications that lead to the assignment of new tRNA identities and a change in the genetic code.}, }
@article {pmid30698308, year = {2019}, author = {El-Sheikh, RM and Mansy, SS and Nessim, IG and Hosni, HN and El Hindawi, A and Hassanein, MH and AbdelFattah, AS}, title = {Carbamoyl phosphate synthetase 1 (CPS1) as a prognostic marker in chronic hepatitis C infection.}, journal = {APMIS : acta pathologica, microbiologica, et immunologica Scandinavica}, volume = {127}, number = {2}, pages = {93-105}, doi = {10.1111/apm.12917}, pmid = {30698308}, issn = {1600-0463}, support = {100//Theodor Bilharz Research Institute (TBRI)/ ; }, mesh = {Adult ; Aged ; Biomarkers/blood ; Carbamoyl-Phosphate Synthase (Ammonia)/*blood ; Female ; Hepatitis C, Chronic/mortality/*pathology ; Humans ; Liver/pathology ; Liver Cirrhosis/*pathology ; Male ; Middle Aged ; Mitochondria/*pathology/ultrastructure ; Prognosis ; Urea/blood ; }, abstract = {This study aims to assess the value of carbamoyl phosphate synthetase 1 (CPS1), as a non-invasive serum marker, for the evolution of chronic HCV infection and hepatic fibrosis. Seventy-two patients with HCV positive serum RNA and 15 health volunteers were enrolled in this study. Out of 72 patients, 10 patients had decompensated liver with ascites. Quantitative analysis of CPS1 was performed in the harvested sera and corresponding liver biopsies using ELISA and immunohistochemistry techniques respectively. Also, mitochondrial count using electron microscopy, urea analysis and conventional liver tests were done. Patients were grouped into (F1 + F2) and (F3 + F4) representing stages of moderate and severe fibrosis respectively. Tissue and serum CPS1 (s.CPS1) correlated significantly in moderate and severe fibrosis. Patients with severe fibrosis showed significantly higher levels of s.CPS1 (p-value ≤ 0.05) and significantly lower mitochondrial counts (p-value = 0.0065) than those with moderate fibrosis. S.urea positively correlated with s.CPS1 only in the decompensated group, at which s.urea reached maximal levels. In conclusion, s.CPS1 is a potential non-invasive marker for the assessment of severity and progression of HCV in relation to mitochondrial dysfunction. Also, increased s.urea with the progression of the disease is mainly due to a concurrent renal malfunction, which needs further investigation.}, }
@article {pmid30670662, year = {2019}, author = {Bloomfield, G and Paschke, P and Okamoto, M and Stevens, TJ and Urushihara, H}, title = {Triparental inheritance in Dictyostelium.}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {116}, number = {6}, pages = {2187-2192}, doi = {10.1073/pnas.1814425116}, pmid = {30670662}, issn = {1091-6490}, support = {MC_U105115237//Medical Research Council/United Kingdom ; }, abstract = {Sex promotes the recombination and reassortment of genetic material and is prevalent across eukaryotes, although our knowledge of the molecular details of sexual inheritance is scant in several major lineages. In social amoebae, sex involves a promiscuous mixing of cytoplasm before zygotes consume the majority of cells, but for technical reasons, sexual progeny have been difficult to obtain and study. We report here genome-wide characterization of meiotic progeny in Dictyostelium discoideum We find that recombination occurs at high frequency in pairwise crosses between all three mating types, despite the absence of the Spo11 enzyme that is normally required to initiate crossover formation. Fusions of more than two gametes to form transient syncytia lead to frequent triparental inheritance, with haploid meiotic progeny bearing recombined nuclear haplotypes from two parents and the mitochondrial genome from a third. Cells that do not contribute genetically to the Dictyostelium zygote nucleus thereby have a stake in the next haploid generation. D. discoideum mitochondrial genomes are polymorphic, and our findings raise the possibility that some of this variation might be a result of sexual selection on genes that can promote the spread of individual organelle genomes during sex. This kind of self-interested mitochondrial behavior may have had important consequences during eukaryogenesis and the initial evolution of sex.}, }
@article {pmid30668797, year = {2019}, author = {Backes, S and Garg, SG and Becker, L and Peleh, V and Glockshuber, R and Gould, SB and Herrmann, JM}, title = {Development of the Mitochondrial Intermembrane Space Disulfide Relay Represents a Critical Step in Eukaryotic Evolution.}, journal = {Molecular biology and evolution}, volume = {36}, number = {4}, pages = {742-756}, doi = {10.1093/molbev/msz011}, pmid = {30668797}, issn = {1537-1719}, abstract = {The mitochondrial intermembrane space evolved from the bacterial periplasm. Presumably as a consequence of their common origin, most proteins of these compartments are stabilized by structural disulfide bonds. The molecular machineries that mediate oxidative protein folding in bacteria and mitochondria, however, appear to share no common ancestry. Here we tested whether the enzymes Erv1 and Mia40 of the yeast mitochondrial disulfide relay could be functionally replaced by corresponding components of other compartments. We found that the sulfhydryl oxidase Erv1 could be replaced by the Ero1 oxidase or the protein disulfide isomerase from the endoplasmic reticulum, however at the cost of respiration deficiency. In contrast to Erv1, the mitochondrial oxidoreductase Mia40 proved to be indispensable and could not be replaced by thioredoxin-like enzymes, including the cytoplasmic reductase thioredoxin, the periplasmic dithiol oxidase DsbA, and Pdi1. From our studies we conclude that the profound inertness against glutathione, its slow oxidation kinetics and its high affinity to substrates renders Mia40 a unique and essential component of mitochondrial biogenesis. Evidently, the development of a specific mitochondrial disulfide relay system represented a crucial step in the evolution of the eukaryotic cell.}, }
@article {pmid30649994, year = {2019}, author = {Kraft, LM and Lackner, LL}, title = {A conserved mechanism for mitochondria-dependent dynein anchoring.}, journal = {Molecular biology of the cell}, volume = {30}, number = {5}, pages = {691-702}, doi = {10.1091/mbc.E18-07-0466}, pmid = {30649994}, issn = {1939-4586}, support = {R01 GM120303/GM/NIGMS NIH HHS/United States ; }, abstract = {Mitochondrial anchors have functions that extend beyond simply positioning mitochondria. In budding yeast, mitochondria drive the assembly of the mitochondrial anchor protein Num1 into clusters, which serve to anchor mitochondria as well as dynein to the cell cortex. Here, we explore a conserved role for mitochondria in dynein anchoring by examining the tethering functions of the evolutionarily distant Schizosaccharomyces pombe Num1 homologue. In addition to its function in dynein anchoring, we find that S. pombe Num1, also known as Mcp5, interacts with and tethers mitochondria to the plasma membrane in S. pombe and Saccharomyces cerevisiae. Thus, the mitochondria and plasma membrane-binding domains of the Num1 homologues, as well as the membrane features these domains recognize, are conserved. In S. pombe, we find that mitochondria impact the assembly and cellular distribution of Num1 clusters and that Num1 clusters actively engaged in mitochondrial tethering serve as cortical attachment sites for dynein. Thus, mitochondria play a critical and conserved role in the formation and distribution of dynein-anchoring sites at the cell cortex and, as a consequence, impact dynein function. These findings shed light on an ancient mechanism of mitochondria-dependent dynein anchoring that is conserved over more than 450 million years of evolution, raising the intriguing possibility that the role mitochondria play in dynein anchoring and function extends beyond yeast to higher eukaryotes.}, }
@article {pmid30630097, year = {2019}, author = {Li, W and Freudenberg, J and Freudenberg, J}, title = {Alignment-free approaches for predicting novel Nuclear Mitochondrial Segments (NUMTs) in the human genome.}, journal = {Gene}, volume = {691}, number = {}, pages = {141-152}, doi = {10.1016/j.gene.2018.12.040}, pmid = {30630097}, issn = {1879-0038}, mesh = {Algorithms ; Cell Nucleus/*genetics ; Evolution, Molecular ; Genome, Human ; Humans ; Mitochondria/*genetics ; Phylogeny ; Sequence Alignment ; Sequence Analysis, DNA/*methods ; }, abstract = {The nuclear human genome harbors sequences of mitochondrial origin, indicating an ancestral transfer of DNA from the mitogenome. Several Nuclear Mitochondrial Segments (NUMTs) have been detected by alignment-based sequence similarity search, as implemented in the Basic Local Alignment Search Tool (BLAST). Identifying NUMTs is important for the comprehensive annotation and understanding of the human genome. Here we explore the possibility of detecting NUMTs in the human genome by alignment-free sequence similarity search, such as k-mers (k-tuples, k-grams, oligos of length k) distributions. We find that when k=6 or larger, the k-mer approach and BLAST search produce almost identical results, e.g., detect the same set of NUMTs longer than 3 kb. However, when k=5 or k=4, certain signals are only detected by the alignment-free approach, and these may indicate yet unrecognized, and potentially more ancestral NUMTs. We introduce a &quot;Manhattan plot&quot; style representation of NUMT predictions across the genome, which are calculated based on the reciprocal of the Jensen-Shannon divergence between the nuclear and mitochondrial k-mer frequencies. The further inspection of the k-mer-based NUMT predictions however shows that most of them contain long-terminal-repeat (LTR) annotations, whereas BLAST-based NUMT predictions do not. Thus, similarity of the mitogenome to LTR sequences is recognized, which we validate by finding the mitochondrial k-mer distribution closer to those for transposable sequences and specifically, close to some types of LTR.}, }
@article {pmid30621777, year = {2018}, author = {Lynch, M and Marinov, GK}, title = {Response to Martin and colleagues: mitochondria do not boost the bioenergetic capacity of eukaryotic cells.}, journal = {Biology direct}, volume = {13}, number = {1}, pages = {26}, doi = {10.1186/s13062-018-0228-3}, pmid = {30621777}, issn = {1745-6150}, support = {R35 GM122566/GM/NIGMS NIH HHS/United States ; }, abstract = {A recent paper by (Gerlitz et al., Biol Direct 13:21, 2018) questions the validity of the data underlying prior analyses on the bioenergetics capacities of cells, and continues to promote the idea that the mitochondrion endowed eukaryotic cells with energetic superiority over prokaryotes. The former point has been addressed previously, with no resultant changes in the conclusions, and the latter point remains inconsistent with multiple lines of empirical data.}, }
@article {pmid30612859, year = {2019}, author = {Adlakha, J and Karamichali, I and Sangwallek, J and Deiss, S and Bär, K and Coles, M and Hartmann, MD and Lupas, AN and Hernandez Alvarez, B}, title = {Characterization of MCU-Binding Proteins MCUR1 and CCDC90B - Representatives of a Protein Family Conserved in Prokaryotes and Eukaryotic Organelles.}, journal = {Structure (London, England : 1993)}, volume = {27}, number = {3}, pages = {464-475.e6}, doi = {10.1016/j.str.2018.11.004}, pmid = {30612859}, issn = {1878-4186}, abstract = {Membrane-bound coiled-coil proteins are important mediators of signaling, fusion, and scaffolding. Here, we delineate a heterogeneous group of trimeric membrane-anchored proteins in prokaryotes and eukaryotic organelles with a characteristic head-neck-stalk-anchor architecture, in which a membrane-anchored coiled-coil stalk projects an N-terminal head domain via a β-layer neck. Based on sequence analysis, we identify different types of head domains and determine crystal structures of two representatives, the archaeal protein Kcr-0859 and the human CCDC90B, which possesses the most widespread head type. Using mitochondrial calcium uniporter regulator 1 (MCUR1), the functionally characterized paralog of CCDC90B, we study the role of individual domains, and find that the head interacts directly with the mitochondrial calcium uniporter (MCU) and is destabilized upon Ca2+ binding. Our data provide structural details of a class of membrane-bound coiled-coil proteins and identify the conserved head domain of the most widespread type as a mediator of their function.}, }
@article {pmid30612363, year = {2019}, author = {Jelassi, R and Khemaissia, H and Ghemari, C and Raimond, M and Souty-Grosset, C and Nasri-Ammar, K}, title = {Ecotoxicological effects of trace element contamination in talitrid amphipod Orchestia montagui Audouin, 1826.}, journal = {Environmental science and pollution research international}, volume = {26}, number = {6}, pages = {5577-5587}, doi = {10.1007/s11356-018-3974-y}, pmid = {30612363}, issn = {1614-7499}, mesh = {Amphipoda/drug effects/*physiology ; Animals ; Cadmium ; Copper ; Ecotoxicology ; *Environmental Monitoring ; Hepatopancreas ; Trace Elements/*toxicity ; Water Pollutants, Chemical/*toxicity ; Zinc ; }, abstract = {This study deals with the evaluation of trace element bioaccumulation and histological alterations in the hepatopancreas of the supralittoral amphipod Orchestia montagui Audouin, 1826 due to the exposure to cadmium, copper, and zinc. Orchestia montagui individuals were maintained during 14 days in soils contaminated with different trace elements namely cadmium, copper, and zinc; a control was also prepared. Our results show that the mortality and the body mass vary according to the metal and the nominal concentration used. In general, the mortality increases from the seventh day. However, the body mass shows a decrease with cadmium exposure and an increase with copper and zinc exposures. Furthermore, the concentration factor highlights that this species is considered a macroconcentrator for copper and zinc. The hepatopancreas of unexposed and exposed animals were compared to detect histological changes. Our results show significant alterations in the hepatopancreas of the exposed animals after the experiment. The degree of these alterations was found to be dose-dependent. Among the histological changes in the hepatopancreas in O. montagui, a loss of cell structure was noted, especially cell remoteness and border lyses, the reduction of nuclear volume, an increase in the cytoplasm density with the presence of trace element deposits in both the nucleus and vacuoles, a disorganization and destruction of microvilli, and a condensation of the majority of cell organelles and mitochondria swelling. Through this study, we have confirmed that O. montagui can be a relevant model to assess trace metal element pollution in Tunisian coastal lagoons with the aim of using it in future biomonitoring programs.}, }
@article {pmid30604579, year = {2019}, author = {Huang, S and Braun, HP and Gawryluk, RMR and Millar, AH}, title = {Mitochondrial complex II of plants: subunit composition, assembly, and function in respiration and signaling.}, journal = {The Plant journal : for cell and molecular biology}, volume = {}, number = {}, pages = {}, doi = {10.1111/tpj.14227}, pmid = {30604579}, issn = {1365-313X}, support = {FT130101338//ARC Australian Future Fellow/ ; //Faculty of Natural Sciences/Leibniz Universität Hannover/ ; CE140100008//Australian Research Council/ ; }, abstract = {Complex II [succinate dehydrogenase (succinate-ubiquinone oxidoreductase); EC 1.3.5.1; SDH] is the only enzyme shared by both the electron transport chain and the tricarboxylic acid (TCA) cycle in mitochondria. Complex II in plants is considered unusual because of its accessory subunits (SDH5-SDH8), in addition to the catalytic subunits of SDH found in all eukaryotes (SDH1-SDH4). Here, we review compositional and phylogenetic analysis and biochemical dissection studies to both clarify the presence and propose a role for these subunits. We also consider the wider functional and phylogenetic evidence for SDH assembly factors and the reports from plants on the control of SDH1 flavination and SDH1-SDH2 interaction. Plant complex II has been shown to influence stomatal opening, the plant defense response and reactive oxygen species-dependent stress responses. Signaling molecules such as salicyclic acid (SA) and nitric oxide (NO) are also reported to interact with the ubiquinone (UQ) binding site of SDH, influencing signaling transduction in plants. Future directions for SDH research in plants and the specific roles of its different subunits and assembly factors are suggested, including the potential for reverse electron transport to explain the succinate-dependent production of reactive oxygen species in plants and new avenues to explore the evolution of plant mitochondrial complex II and its utility.}, }
@article {pmid30598556, year = {2019}, author = {Rathore, S and Berndtsson, J and Marin-Buera, L and Conrad, J and Carroni, M and Brzezinski, P and Ott, M}, title = {Cryo-EM structure of the yeast respiratory supercomplex.}, journal = {Nature structural &amp; molecular biology}, volume = {26}, number = {1}, pages = {50-57}, doi = {10.1038/s41594-018-0169-7}, pmid = {30598556}, issn = {1545-9985}, abstract = {Respiratory chain complexes execute energy conversion by connecting electron transport with proton translocation over the inner mitochondrial membrane to fuel ATP synthesis. Notably, these complexes form multi-enzyme assemblies known as respiratory supercomplexes. Here we used single-particle cryo-EM to determine the structures of the yeast mitochondrial respiratory supercomplexes III2IV and III2IV2, at 3.2-Å and 3.5-Å resolutions, respectively. We revealed the overall architecture of the supercomplex, which deviates from the previously determined assemblies in mammals; obtained a near-atomic structure of the yeast complex IV; and identified the protein-protein and protein-lipid interactions implicated in supercomplex formation. Take together, our results demonstrate convergent evolution of supercomplexes in mitochondria that, while building similar assemblies, results in substantially different arrangements and structural solutions to support energy conversion.}, }
@article {pmid30598467, year = {2019}, author = {Clergeot, PH and Rode, NO and Glémin, S and Brandström Durling, M and Ihrmark, K and Olson, Å}, title = {Estimating the Fitness Effect of Deleterious Mutations During the Two Phases of the Life Cycle: A New Method Applied to the Root-Rot Fungus Heterobasidion parviporum.}, journal = {Genetics}, volume = {211}, number = {3}, pages = {963-976}, doi = {10.1534/genetics.118.301855}, pmid = {30598467}, issn = {1943-2631}, mesh = {Basidiomycota/*genetics/growth &amp; development ; Diploidy ; *Genetic Fitness ; Genome, Fungal ; Haploidy ; *Life Cycle Stages ; Models, Genetic ; *Mutation ; }, abstract = {Many eukaryote species, including taxa such as fungi or algae, have a lifecycle with substantial haploid and diploid phases. A recent theoretical model predicts that such haploid-diploid lifecycles are stable over long evolutionary time scales when segregating deleterious mutations have stronger effects in homozygous diploids than in haploids and when they are partially recessive in heterozygous diploids. The model predicts that effective dominance-a measure that accounts for these two effects-should be close to 0.5 in these species. It also predicts that diploids should have higher fitness than haploids on average. However, an appropriate statistical framework to conjointly investigate these predictions is currently lacking. In this study, we derive a new quantitative genetic model to test these predictions using fitness data of two haploid parents and their diploid offspring, and genome-wide genetic distance between haploid parents. We apply this model to the root-rot basidiomycete fungus Heterobasidion parviporum-a species where the heterokaryotic (equivalent to the diploid) phase is longer than the homokaryotic (haploid) phase. We measured two fitness-related traits (mycelium growth rate and the ability to degrade wood) in both homokaryons and heterokaryons, and we used whole-genome sequencing to estimate nuclear genetic distance between parents. Possibly due to a lack of power, we did not find that deleterious mutations were recessive or more deleterious when expressed during the heterokaryotic phase. Using this model to compare effective dominance among haploid-diploid species where the relative importance of the two phases varies should help better understand the evolution of haploid-diploid life cycles.}, }
@article {pmid30595847, year = {2018}, author = {Su-Keene, EJ and Bonilla, MM and Padua, MV and Zeh, DW and Zeh, JA}, title = {Simulated climate warming and mitochondrial haplogroup modulate testicular small non-coding RNA expression in the neotropical pseudoscorpion, Cordylochernes scorpioides.}, journal = {Environmental epigenetics}, volume = {4}, number = {4}, pages = {dvy027}, doi = {10.1093/eep/dvy027}, pmid = {30595847}, issn = {2058-5888}, abstract = {Recent theory suggests that tropical terrestrial arthropods are at significant risk from climate warming. Metabolic rate in such ectothermic species increases exponentially with environmental temperature, and a small temperature increase in a hot environment can therefore have a greater physiological impact than a large temperature increase in a cool environment. In two recent studies of the neotropical pseudoscorpion, Cordylochernes scorpioides, simulated climate warming significantly decreased survival, body size and level of sexual dimorphism. However, these effects were minor compared with catastrophic consequences for male fertility and female fecundity, identifying reproduction as the life stage most vulnerable to climate warming. Here, we examine the effects of chronic high-temperature exposure on epigenetic regulation in C. scorpioides in the context of naturally occurring variation in mitochondrial DNA. Epigenetic mechanisms, including DNA methylation, histone modifications and small non-coding RNA (sncRNA) expression, are particularly sensitive to environmental factors such as temperature, which can induce changes in epigenetic states and phenotypes that may be heritable across generations. Our results indicate that exposure of male pseudoscorpions to elevated temperature significantly altered the expression of >60 sncRNAs in testicular tissue, specifically microRNAs and piwi-interacting RNAs. Mitochondrial haplogroup was also a significant factor influencing both sncRNAs and mitochondrial gene expression. These findings demonstrate that chronic heat stress causes changes in epigenetic profiles that may account for reproductive dysfunction in C. scorpioides males. Moreover, through its effects on epigenetic regulation, mitochondrial DNA polymorphism may provide the potential for an adaptive evolutionary response to climate warming.}, }
@article {pmid30592713, year = {2018}, author = {DiMaio, J and Ruthel, G and Cannon, JJ and Malfara, MF and Povelones, ML}, title = {The single mitochondrion of the kinetoplastid parasite Crithidia fasciculata is a dynamic network.}, journal = {PloS one}, volume = {13}, number = {12}, pages = {e0202711}, doi = {10.1371/journal.pone.0202711}, pmid = {30592713}, issn = {1932-6203}, abstract = {Mitochondria are central organelles in cellular metabolism. Their structure is highly dynamic, allowing them to adapt to different energy requirements, to be partitioned during cell division, and to maintain functionality. Mitochondrial dynamics, including membrane fusion and fission reactions, are well studied in yeast and mammals but it is not known if these processes are conserved throughout eukaryotic evolution. Kinetoplastid parasites are some of the earliest-diverging eukaryotes to retain a mitochondrion. Each cell has only a single mitochondrial organelle, making them an interesting model for the role of dynamics in controlling mitochondrial architecture. We have investigated the mitochondrial division cycle in the kinetoplastid Crithidia fasciculata. The majority of mitochondrial biogenesis occurs during the G1 phase of the cell cycle, and the mitochondrion is divided symmetrically in a process coincident with cytokinesis. Live cell imaging revealed that the mitochondrion is highly dynamic, with frequent changes in the topology of the branched network. These remodeling reactions include tubule fission, fusion, and sliding, as well as new tubule formation. We hypothesize that the function of this dynamic remodeling is to homogenize mitochondrial contents and to facilitate rapid transport of mitochondria-encoded gene products from the area containing the mitochondrial nucleoid to other parts of the organelle.}, }
@article {pmid30592414, year = {2018}, author = {Li, J and Liu, X and Zhang, H and Ge, X and Tang, Y and Xu, Z and Tian, L and Yuan, X and Mao, X and Liu, Z}, title = {Ferrocenyl-Triphenyltin Complexes as Lysosome-Targeted Imaging and Anticancer Agents.}, journal = {Inorganic chemistry}, volume = {}, number = {}, pages = {}, doi = {10.1021/acs.inorgchem.8b03305}, pmid = {30592414}, issn = {1520-510X}, abstract = {In this paper, two ferrocenyl-triphenyltin complexes were synthesized and characterized. Complex 2 is constructed as new multifunctional therapeutic platform for lysosome-targeted imaging and displayed much higher cytotoxicity than its analogue 1 by the introduction of a methyl group instead of a hydrogen atom in acylhydrazone. The cyclic voltammograms and reaction with GSH (glutathione) further confirmed that complex 1 has a reversible redox peak and can react with GSH, which indicate that complex 1 might lose its anticancer effect by undergoing reaction with GSH once it enters the cancer cell. Complex 2 could effectively catalyze the oxidation of NADH (the reduced form of nicotinamide adenine dinucleotide) to NAD+ and induce the production of reactive oxygen species (ROS), lead to caspase-dependent apoptosis through damaged mitochondria, simultaneously, accounting for the mitochondrial vacuolization and karyorrhexis. The caspase-3 activation and cytoplasmic vacuolation karyorrhexis induced by complex 2 revealed that the A549 cell lines might undergo cell death primarily mediated by apoptosis and oncosis; however, 1 cannot reproduce this effect. Taken together, these results indicated that complex 2 has more potential for evolution as a new bioimaging and anticancer agent.}, }
@article {pmid30590727, year = {2018}, author = {Tsitsekian, D and Daras, G and Alatzas, A and Templalexis, D and Hatzopoulos, P and Rigas, S}, title = {Comprehensive analysis of Lon proteases in plants highlights independent gene duplication events.}, journal = {Journal of experimental botany}, volume = {}, number = {}, pages = {}, doi = {10.1093/jxb/ery440}, pmid = {30590727}, issn = {1460-2431}, abstract = {The degradation of damaged proteins is essential for cell viability. Lon is a highly conserved ATP-dependent serine-lysine protease that maintains proteostasis. We performed a comparative genome-wide analysis to determine the evolutionary history of Lon proteases. Prokaryotes and unicellular eukaryotes retained a single Lon copy, whereas multicellular eukaryotes acquired a peroxisomal copy, in addition to the mitochondrial gene, to sustain the evolution of higher order organ structures. Land plants developed small Lon gene families. Despite the Lon2 peroxisomal paralog, Lon genes triplicated in the Arabidopsis lineage through sequential evolutionary events including whole-genome and tandem duplications. The retention of Lon1, Lon4, and Lon3 triplicates relied on their differential and even contrasting expression patterns, distinct subcellular targeting mechanisms, and functional divergence. Lon1 seems similar to the pre-duplication ancestral gene unit, whereas the duplication of Lon3 and Lon4 is evolutionarily recent. In the wider context of plant evolution, papaya is the only genome with a single ancestral Lon1-type gene. The evolutionary trend among plants is to acquire Lon copies with ambiguous pre-sequences for dual-targeting to mitochondria and chloroplasts, and a substrate recognition domain that deviates from the ancestral Lon1 type. Lon genes constitute a paradigm of dynamic evolution contributing to understanding the functional fate of gene duplicates.}, }
@article {pmid30590568, year = {2019}, author = {Łukasik, P and Chong, RA and Nazario, K and Matsuura, Y and Bublitz, AC and Campbell, MA and Meyer, MC and Van Leuven, JT and Pessacq, P and Veloso, C and Simon, C and McCutcheon, JP}, title = {One Hundred Mitochondrial Genomes of Cicadas.}, journal = {The Journal of heredity}, volume = {110}, number = {2}, pages = {247-256}, doi = {10.1093/jhered/esy068}, pmid = {30590568}, issn = {1465-7333}, abstract = {Mitochondrial genomes can provide valuable information on the biology and evolutionary histories of their host organisms. Here, we present and characterize the complete coding regions of 107 mitochondrial genomes (mitogenomes) of cicadas (Insecta: Hemiptera: Auchenorrhyncha: Cicadoidea), representing 31 genera, 61 species, and 83 populations. We show that all cicada mitogenomes retain the organization and gene contents thought to be ancestral in insects, with some variability among cicada clades in the length of a region between the genes nad2 and cox1, which encodes 3 tRNAs. Phylogenetic analyses using these mitogenomes recapitulate a recent 5-gene classification of cicadas into families and subfamilies, but also identify a species that falls outside of the established taxonomic framework. While protein-coding genes are under strong purifying selection, tests of relative evolutionary rates reveal significant variation in evolutionary rates across taxa, highlighting the dynamic nature of mitochondrial genome evolution in cicadas. These data will serve as a useful reference for future research into the systematics, ecology, and evolution of the superfamily Cicadoidea.}, }
@article {pmid30588726, year = {2018}, author = {Hill, GE and Havird, JC and Sloan, DB and Burton, RS and Greening, C and Dowling, DK}, title = {Assessing the fitness consequences of mitonuclear interactions in natural populations.}, journal = {Biological reviews of the Cambridge Philosophical Society}, volume = {}, number = {}, pages = {}, doi = {10.1111/brv.12493}, pmid = {30588726}, issn = {1469-185X}, support = {HSF 15/2//Hermon Slade Foundation/ ; R01 GM118046/GM/NIGMS NIH HHS/United States ; FT160100022, DP170100165, DE170100310//Australian Research Council/ ; DEB1551466//National Science Foundation (NSF)/ ; R01 GM118046//National Institutes of Health (NIH)/ ; }, abstract = {Metazoans exist only with a continuous and rich supply of chemical energy from oxidative phosphorylation in mitochondria. The oxidative phosphorylation machinery that mediates energy conservation is encoded by both mitochondrial and nuclear genes, and hence the products of these two genomes must interact closely to achieve coordinated function of core respiratory processes. It follows that selection for efficient respiration will lead to selection for compatible combinations of mitochondrial and nuclear genotypes, and this should facilitate coadaptation between mitochondrial and nuclear genomes (mitonuclear coadaptation). Herein, we outline the modes by which mitochondrial and nuclear genomes may coevolve within natural populations, and we discuss the implications of mitonuclear coadaptation for diverse fields of study in the biological sciences. We identify five themes in the study of mitonuclear interactions that provide a roadmap for both ecological and biomedical studies seeking to measure the contribution of intergenomic coadaptation to the evolution of natural populations. We also explore the wider implications of the fitness consequences of mitonuclear interactions, focusing on central debates within the fields of ecology and biomedicine.}, }
@article {pmid30570818, year = {2018}, author = {Williams, AM and Friso, G and van Wijk, KJ and Sloan, DB}, title = {Extreme variation in rates of evolution in the plastid Clp protease complex.}, journal = {The Plant journal : for cell and molecular biology}, volume = {}, number = {}, pages = {}, doi = {10.1111/tpj.14208}, pmid = {30570818}, issn = {1365-313X}, support = {DGE-1321845//National Science Foundation (NSF) Graduate Research Fellowship/ ; MCB-1733227//National Science Foundation (NSF) Graduate Research Fellowship/ ; MCB-1614629//National Science Foundation (NSF) Graduate Research Fellowship/ ; //Department of Education GAANN Fellowship/ ; }, abstract = {Eukaryotic cells represent an intricate collaboration between multiple genomes, even down to the level of multi-subunit complexes in mitochondria and plastids. One such complex in plants is the caseinolytic protease (Clp), which plays an essential role in plastid protein turnover. The proteolytic core of Clp comprises subunits from one plastid-encoded gene (clpP1) and multiple nuclear genes. TheclpP1 gene is highly conserved across most green plants, but it is by far the fastest evolving plastid-encoded gene in some angiosperms. To better understand these extreme and mysterious patterns of divergence, we investigated the history ofclpP1 molecular evolution across green plants by extracting sequences from 988 published plastid genomes. We find thatclpP1 has undergone remarkably frequent bouts of accelerated sequence evolution and architectural changes (e.g. a loss of introns andRNA-editing sites) within seed plants. AlthoughclpP1 is often assumed to be a pseudogene in such cases, multiple lines of evidence suggest that this is rarely true. We applied comparative native gel electrophoresis of chloroplast protein complexes followed by protein mass spectrometry in two species within the angiosperm genusSilene, which has highly elevated and heterogeneous rates ofclpP1 evolution. We confirmed thatclpP1 is expressed as a stable protein and forms oligomeric complexes with the nuclear-encoded Clp subunits, even in one of the most divergentSilene species. Additionally, there is a tight correlation between amino acid substitution rates inclpP1 and the nuclear-encoded Clp subunits across a broad sampling of angiosperms, suggesting continuing selection on interactions within this complex.}, }
@article {pmid30565720, year = {2018}, author = {Morsi, M and Kobeissy, F and Magdeldin, S and Maher, A and Aboelmagd, O and Johar, D and Bernstein, L}, title = {A shared comparison of diabetes mellitus and neurodegenerative disorders.}, journal = {Journal of cellular biochemistry}, volume = {}, number = {}, pages = {}, doi = {10.1002/jcb.28094}, pmid = {30565720}, issn = {1097-4644}, abstract = {Diabetes mellitus (DM), one of the most prevalent metabolic diseases in the world population, is associated with a number of comorbid conditions including obesity, pancreatic endocrine changes, and renal and cardio-cerebrovascular alterations, coupled with peripheral neuropathy and neurodegenerative disease, some of these disorders are bundled into metabolic syndrome. Type 1 DM (T1DM) is an autoimmune disease that destroys the insulin-secreting islet cells. Type 2 DM (T2DM) is diabetes that is associated with an imbalance in the glucagon/insulin homeostasis that leads to the formation of amyloid deposits in the brain, pancreatic islet cells, and possibly in the kidney glomerulus. There are several layers of molecular pathologic alterations that contribute to the DM metabolic pathophysiology and its associated neuropathic manifestations. In this review, we describe the general signature metabolic features of DM and the cross-talk with neurodegeneration. We will assess the underlying molecular key players associated with DM-induced neuropathic disorders that are associated with both T1DM and T2DM. In this context, we will highlight the role of tau and amyloid protein deposits in the brain as well in the pancreatic islet cells, and possibly in the kidney glomerulus. Furthermore, we will discuss the central role of mitochondria, oxidative stress, and the unfolded protein response in mediating the DM-associated neuropathic degeneration. This study will elucidate the relationship between DM and neurodegeneration which may account for the evolution of other neurodegenerative diseases, particularly Alzheimer's disease and Parkinson's disease as discussed later.}, }
@article {pmid30563833, year = {2019}, author = {Wynn, EL and Christensen, AC}, title = {Repeats of Unusual Size in Plant Mitochondrial Genomes: Identification, Incidence and Evolution.}, journal = {G3 (Bethesda, Md.)}, volume = {9}, number = {2}, pages = {549-559}, doi = {10.1534/g3.118.200948}, pmid = {30563833}, issn = {2160-1836}, abstract = {Plant mitochondrial genomes have excessive size relative to coding capacity, a low mutation rate in genes and a high rearrangement rate. They also have abundant non-tandem repeats often including pairs of large repeats which cause isomerization of the genome by recombination, and numerous repeats of up to several hundred base pairs that recombine only when the genome is stressed by DNA damaging agents or mutations in DNA repair pathway genes. Early work on mitochondrial genomes led to the suggestion that repeats in the size range from several hundred to a few thousand base pair are underrepresented. The repeats themselves are not well-conserved between species, and are not always annotated in mitochondrial sequence assemblies. We systematically identified and compared these repeats, which are important clues to mechanisms of DNA maintenance in mitochondria. We developed a tool to find and curate non-tandem repeats larger than 50bp and analyzed the complete mitochondrial sequences from 157 plant species. We observed an interesting difference between taxa: the repeats are larger and more frequent in the vascular plants. Analysis of closely related species also shows that plant mitochondrial genomes evolve in dramatic bursts of breakage and rejoining, complete with DNA sequence gain and loss. We suggest an adaptive explanation for the existence of the repeats and their evolution.}, }
@article {pmid30563453, year = {2018}, author = {Harman, A and Barth, C}, title = {The Dictyostelium discoideum homologue of Twinkle, Twm1, is a mitochondrial DNA helicase, an active primase and promotes mitochondrial DNA replication.}, journal = {BMC molecular biology}, volume = {19}, number = {1}, pages = {12}, doi = {10.1186/s12867-018-0114-7}, pmid = {30563453}, issn = {1471-2199}, abstract = {BACKGROUND: DNA replication requires contributions from various proteins, such as DNA helicases; in mitochondria Twinkle is important for maintaining and replicating mitochondrial DNA. Twinkle helicases are predicted to also possess primase activity, as has been shown in plants; however this activity appears to have been lost in metazoans. Given this, the study of Twinkle in other organisms is required to better understand the evolution of this family and the roles it performs within mitochondria.<br><br>RESULTS: Here we describe the characterization of a Twinkle homologue, Twm1, in the amoeba Dictyostelium discoideum, a model organism for mitochondrial genetics and disease. We show that Twm1 is important for mitochondrial function as it maintains mitochondrial DNA copy number in vivo. Twm1 is a helicase which unwinds DNA resembling open forks, although it can act upon substrates with a single 3' overhang, albeit less efficiently. Furthermore, unlike human Twinkle, Twm1 has primase activity in vitro. Finally, using a novel in bacterio approach, we demonstrated that Twm1 promotes DNA replication.<br><br>CONCLUSIONS: We conclude that Twm1 is a replicative mitochondrial DNA helicase which is capable of priming DNA for replication. Our results also suggest that non-metazoan Twinkle could function in the initiation of mitochondrial DNA replication. While further work is required, this study has illuminated several alternative processes of mitochondrial DNA maintenance which might also be performed by the Twinkle family of helicases.}, }
@article {pmid30555069, year = {2018}, author = {Idnurm, A}, title = {Mystique of Phycomyces blakesleeanus is a peculiar mitochondrial genetic element that is highly variable in DNA sequence while subjected to strong negative selection.}, journal = {Journal of genetics}, volume = {97}, number = {5}, pages = {1195-1204}, pmid = {30555069}, issn = {0973-7731}, mesh = {Biological Evolution ; DNA, Mitochondrial/*genetics ; *Genetic Variation ; *Genome, Mitochondrial ; *Interspersed Repetitive Sequences ; Mitochondria/*genetics ; Phycomyces/*genetics ; Phylogeny ; *Selection, Genetic ; Sequence Homology ; }, abstract = {A DNA region in the mitochondrial genome of the fungus Phycomyces blakesleeanus (Mucorales, Mucoromycota) was characterized in a population of wild-type strains. The region encodes a predicted protein similar to the reverse transcriptases encoded by mitochondrial retroplasmids of Neurospora species and other Sordariomycetes (Ascomycota), but is uncommon in other fungi. DNA sequences of this element, named mystique, are highly variable between the strains, having greater than 2.5% divergence, yet most of the nucleotide differences fall in codon positions that do not change the amino acid sequence. The high proportion of polymorphisms coupled to the rarity of nonsynonymous changes suggests that mystique is subject to counteracting forces of hypermutation and purifying selection. However, while evidence for negative selection may infer that the element provides a fitness benefit, some strains of P. blakesleeanus do not have the element and grow equivalently well as those strains with it. A mechanism to explain the variability between the mystique alleles is proposed, of error-prone replication through an RNA intermediate, reverse transcription and reintegration of the element into the mitochondrial genome.}, }
@article {pmid30545443, year = {2019}, author = {Son, JM and Lee, C}, title = {Mitochondria: multifaceted regulators of aging.}, journal = {BMB reports}, volume = {52}, number = {1}, pages = {13-23}, pmid = {30545443}, issn = {1976-670X}, support = {R01 AG052558/AG/NIA NIH HHS/United States ; }, abstract = {Aging is accompanied by a time-dependent progressive deterioration of multiple factors of the cellular system. The past several decades have witnessed major leaps in our understanding of the biological mechanisms of aging using dietary, genetic, pharmacological, and physical interventions. Metabolic processes, including nutrient sensing pathways and mitochondrial function, have emerged as prominent regulators of aging. Mitochondria have been considered to play a key role largely due to their production of reactive oxygen species (ROS), resulting in DNA damage that accumulates over time and ultimately causes cellular failure. This theory, known as the mitochondrial free radical theory of aging (MFRTA), was favored by the aging field, but increasing inconsistent evidence has led to criticism and rejection of this idea. However, MFRTA should not be hastily rejected in its entirety because we now understand that ROS is not simply an undesired toxic metabolic byproduct, but also an important signaling molecule that is vital to cellular fitness. Notably, mitochondrial function, a term traditionally referred to bioenergetics and apoptosis, has since expanded considerably. It encompasses numerous other key biological processes, including the following: (i) complex metabolic processes, (ii) intracellular and endocrine signaling/communication, and (iii) immunity/inflammation. Here, we will discuss shortcomings of previous concepts regarding mitochondria in aging and their emerging roles based on recent advances. We will also discuss how the mitochondrial genome integrates with major theories on the evolution of aging. [BMB Reports 2019; 52(1): 13-23].}, }
@article {pmid30523084, year = {2018}, author = {Antonova-Koch, Y and Meister, S and Abraham, M and Luth, MR and Ottilie, S and Lukens, AK and Sakata-Kato, T and Vanaerschot, M and Owen, E and Jado, JC and Maher, SP and Calla, J and Plouffe, D and Zhong, Y and Chen, K and Chaumeau, V and Conway, AJ and McNamara, CW and Ibanez, M and Gagaring, K and Serrano, FN and Eribez, K and Taggard, CM and Cheung, AL and Lincoln, C and Ambachew, B and Rouillier, M and Siegel, D and Nosten, F and Kyle, DE and Gamo, FJ and Zhou, Y and Llinás, M and Fidock, DA and Wirth, DF and Burrows, J and Campo, B and Winzeler, EA}, title = {Open-source discovery of chemical leads for next-generation chemoprotective antimalarials.}, journal = {Science (New York, N.Y.)}, volume = {362}, number = {6419}, pages = {}, doi = {10.1126/science.aat9446}, pmid = {30523084}, issn = {1095-9203}, support = {D43 TW009343/TW/FIC NIH HHS/United States ; P50 GM085764/GM/NIGMS NIH HHS/United States ; R01 AI103058/AI/NIAID NIH HHS/United States ; R01 AI090141/AI/NIAID NIH HHS/United States ; R01 AI093716/AI/NIAID NIH HHS/United States ; }, mesh = {Antimalarials/chemistry/isolation &amp; purification/*pharmacology/therapeutic use ; *Chemoprevention ; *Drug Discovery ; Drug Evaluation, Preclinical ; Humans ; Malaria/*prevention &amp; control ; Mitochondria/drug effects ; Plasmodium/*drug effects/growth &amp; development ; }, abstract = {To discover leads for next-generation chemoprotective antimalarial drugs, we tested more than 500,000 compounds for their ability to inhibit liver-stage development of luciferase-expressing Plasmodium spp. parasites (681 compounds showed a half-maximal inhibitory concentration of less than 1 micromolar). Cluster analysis identified potent and previously unreported scaffold families as well as other series previously associated with chemoprophylaxis. Further testing through multiple phenotypic assays that predict stage-specific and multispecies antimalarial activity distinguished compound classes that are likely to provide symptomatic relief by reducing asexual blood-stage parasitemia from those which are likely to only prevent malaria. Target identification by using functional assays, in vitro evolution, or metabolic profiling revealed 58 mitochondrial inhibitors but also many chemotypes possibly with previously unidentified mechanisms of action.}, }
@article {pmid30535838, year = {2019}, author = {Kumar, V and Santhosh Kumar, TR and Kartha, CC}, title = {Mitochondrial membrane transporters and metabolic switch in heart failure.}, journal = {Heart failure reviews}, volume = {24}, number = {2}, pages = {255-267}, doi = {10.1007/s10741-018-9756-2}, pmid = {30535838}, issn = {1573-7322}, abstract = {Mitochondrial dysfunction is widely recognized as a major factor for the progression of cardiac failure. Mitochondrial uptake of metabolic substrates and their utilization for ATP synthesis, electron transport chain activity, reactive oxygen species levels, ion homeostasis, mitochondrial biogenesis, and dynamics as well as levels of reactive oxygen species in the mitochondria are key factors which regulate mitochondrial function in the normal heart. Alterations in these functions contribute to adverse outcomes in heart failure. Iron imbalance and oxidative stress are also major factors for the evolution of cardiac hypertrophy, heart failure, and aging-associated pathological changes in the heart. Mitochondrial ATP-binding cassette (ABC) transporters have a key role in regulating iron metabolism and maintenance of redox status in cells. Deficiency of mitochondrial ABC transporters is associated with an impaired mitochondrial electron transport chain complex activity, iron overload, and increased levels of reactive oxygen species, all of which can result in mitochondrial dysfunction. In this review, we discuss the role of mitochondrial ABC transporters in mitochondrial metabolism and metabolic switch, alterations in the functioning of ABC transporters in heart failure, and mitochondrial ABC transporters as possible targets for therapeutic intervention in cardiac failure.}, }
@article {pmid30527196, year = {2018}, author = {Kazdal, D and Harms, A and Endris, V and Penzel, R and Oliveira, C and Kriegsmann, M and Longuespée, R and Winter, H and Schneider, MA and Muley, T and Pfarr, N and Weichert, W and Stenzinger, A and Warth, A}, title = {Subclonal evolution of pulmonary adenocarcinomas delineated by spatially distributed somatic mitochondrial mutations.}, journal = {Lung cancer (Amsterdam, Netherlands)}, volume = {126}, number = {}, pages = {80-88}, doi = {10.1016/j.lungcan.2018.10.024}, pmid = {30527196}, issn = {1872-8332}, abstract = {OBJECTIVES: The potential role of cancer associated somatic mutations of the mitochondrial genome (mtDNA) is controversial and still poorly understood. Our group and others recently challenged a direct tumorigenic impact and suggested a passenger-like character. In combination with the known increased mutation rate, somatic mtDNA mutations account for an interesting tool to delineate tumor evolution. Here, we comprehensively analyzed the spatial distribution of somatic mtDNA mutations throughout whole tumor sections of pulmonary adenocarcinoma (ADC).<br><br>MATERIALS AND METHODS: Central sections of 19 ADC were analyzed in a segmented manner (11-34 segments/tumor) together with non-neoplastic tissue samples and lymph node metastasis, if present. We performed whole mtDNA sequencing and real-time PCR based quantification of mtDNA copy numbers for all samples. Further, histological growth patterns were determined on H&amp;E sections and the tumor cell content was quantified by digital pathology analyses.<br><br>RESULTS: Somatic mtDNA mutations were present in 96% (18/19) of the analyzed tumors, either ubiquitously or restricted to specific tumor regions. Spatial and histological mapping of the mutations enabled the identification of subclonal structures and phylogenetic relations within a tumor section indicating different progression levels. In this regard, lymph node metastases seem to be related to early events in ADC development. There was no concurrence between histological and mtDNA mutation based clusters. However, micropapillary patterns occurred only in tumors with ubiquitous mutations. ADC with more than two ubiquitous mutations were associated with shorter disease-free survival (p < 0.01).<br><br>CONCLUSION: Cancer related mtDNA mutations are interesting candidates for the understanding of subclonal ADC evolution and perspectively for monitoring tumor progression. Our data reveal a potential prognostic relevance of somatic mtDNA mutations.}, }
@article {pmid30526820, year = {2018}, author = {Ndiaye, PI and Marchand, B and Bâ, CT and Justine, JL and Bray, RA and Quilichini, Y}, title = {Ultrastructure of mature spermatozoa of three Bucephalidae (Prosorhynchus longisaccatus, Rhipidocotyle khalili and Bucephalus margaritae) and phylogenetic implications.}, journal = {Parasite (Paris, France)}, volume = {25}, number = {}, pages = {65}, doi = {10.1051/parasite/2018065}, pmid = {30526820}, issn = {1776-1042}, mesh = {Animals ; Axoneme/ultrastructure ; Cell Nucleus/ultrastructure ; Fish Diseases/parasitology ; Fishes ; Male ; Microscopy, Electron, Transmission ; Microtubules/ultrastructure ; Mitochondria/ultrastructure ; New Caledonia ; Pacific Ocean ; *Phylogeny ; Spermatozoa/classification/*ultrastructure ; Trematoda/classification/*ultrastructure ; Trematode Infections/parasitology/veterinary ; }, abstract = {We describe here the mature spermatozoa of three species of bucephalids, namely Bucephalus margaritae, Rhipidocotyle khalili and Prosorhynchus longisaccatus. This study provides the first ultrastructural data on the genera Bucephalus and Rhipidocotyle and enabled us to confirm the model of the mature spermatozoon in the Bucephalinae. The spermatozoon exhibits two axonemes with the 9 + &quot;1&quot; pattern of the Trepaxonemata, one of which is very short, lateral expansion, external ornamentation of the plasma membrane located in the anterior extremity of the spermatozoon and associated with cortical microtubules, spine-like bodies, a mitochondrion, and a nucleus. The maximum number of cortical microtubules is located in the anterior part of the spermatozoon. However, more studies are needed to elucidate if spine-like bodies are present in all the Bucephalinae or not. In the Prosorhynchinae, the mature spermatozoon exhibits a similar ultrastructural pattern. Some differences are observed, particularly the axoneme lengths and the arrangement of the spine-like bodies. The posterior extremity of the spermatozoon in the Bucephalinae exhibits only the nucleus, but prosorhynchines have microtubules.}, }
@article {pmid30518034, year = {2018}, author = {Derbikova, K and Kuzmenko, A and Levitskii, S and Klimontova, M and Chicherin, I and Baleva, MV and Krasheninnikov, IA and Kamenski, P}, title = {Biological and Evolutionary Significance of Terminal Extensions of Mitochondrial Translation Initiation Factor 3.}, journal = {International journal of molecular sciences}, volume = {19}, number = {12}, pages = {}, doi = {10.3390/ijms19123861}, pmid = {30518034}, issn = {1422-0067}, support = {17-14-01005//Russian Science Foundation/ ; 17-54-16005//Russian Foundation for Basic Research/ ; State Assignment AAAA_A16_116021660073_5//Russian Federation Government/ ; }, mesh = {Escherichia coli/metabolism ; *Evolution, Molecular ; Humans ; Mitochondria/*metabolism ; Prokaryotic Initiation Factor-3/*chemistry/*metabolism ; Protein Domains ; Saccharomyces cerevisiae/metabolism ; Saccharomyces cerevisiae Proteins/chemistry/metabolism ; }, abstract = {Protein biosynthesis in mitochondria is organized in a bacterial manner. However, during evolution, mitochondrial translation mechanisms underwent many organelle-specific changes. In particular, almost all mitochondrial translation factors, being orthologous to bacterial proteins, are characterized by some unique elements of primary or secondary structure. In the case of the organellar initiation factor 3 (IF3), these elements are several dozen amino acids long N- and C-terminal extensions. This study focused on the terminal extensions of baker's yeast mitochondrial IF3, Aim23p. By in vivo deletion and complementation analysis, we show that at least one extension is necessary for Aim23p function. At the same time, human mitochondrial IF3 is fully functional in yeast mitochondria even without both terminal extensions. While Escherichia coli IF3 itself is poorly active in yeast mitochondria, adding Aim23p terminal extensions makes the resulting chimeric protein as functional as the cognate factor. Our results show that the terminal extensions of IF3 have evolved as the &quot;adaptors&quot; that accommodate the translation factor of bacterial origin to the evolutionary changed protein biosynthesis system in mitochondria.}, }
@article {pmid30517740, year = {2019}, author = {Petrov, AS and Wood, EC and Bernier, CR and Norris, AM and Brown, A and Amunts, A}, title = {Structural Patching Fosters Divergence of Mitochondrial Ribosomes.}, journal = {Molecular biology and evolution}, volume = {36}, number = {2}, pages = {207-219}, doi = {10.1093/molbev/msy221}, pmid = {30517740}, issn = {1537-1719}, abstract = {Mitochondrial ribosomes (mitoribosomes) are essential components of all mitochondria that synthesize proteins encoded by the mitochondrial genome. Unlike other ribosomes, mitoribosomes are highly variable across species. The basis for this diversity is not known. Here, we examine the composition and evolutionary history of mitoribosomes across the phylogenetic tree by combining three-dimensional structural information with a comparative analysis of the secondary structures of mitochondrial rRNAs (mt-rRNAs) and available proteomic data. We generate a map of the acquisition of structural variation and reconstruct the fundamental stages that shaped the evolution of the mitoribosomal large subunit and led to this diversity. Our analysis suggests a critical role for ablation and expansion of rapidly evolving mt-rRNA. These changes cause structural instabilities that are &quot;patched&quot; by the acquisition of pre-existing compensatory elements, thus providing opportunities for rapid evolution. This mechanism underlies the incorporation of mt-tRNA into the central protuberance of the mammalian mitoribosome, and the altered path of the polypeptide exit tunnel of the yeast mitoribosome. We propose that since the toolkits of elements utilized for structural patching differ between mitochondria of different species, it fosters the growing divergence of mitoribosomes.}, }
@article {pmid30517696, year = {2019}, author = {Ilhan, J and Kupczok, A and Woehle, C and Wein, T and Hülter, NF and Rosenstiel, P and Landan, G and Mizrahi, I and Dagan, T}, title = {Segregational Drift and the Interplay between Plasmid Copy Number and Evolvability.}, journal = {Molecular biology and evolution}, volume = {36}, number = {3}, pages = {472-486}, doi = {10.1093/molbev/msy225}, pmid = {30517696}, issn = {1537-1719}, abstract = {The ubiquity of plasmids in all prokaryotic phyla and habitats and their ability to transfer between cells marks them as prominent constituents of prokaryotic genomes. Many plasmids are found in their host cell in multiple copies. This leads to an increased mutational supply of plasmid-encoded genes and genetically heterogeneous plasmid genomes. Nonetheless, the segregation of plasmid copies into daughter cells during cell division is considered to occur in the absence of selection on the plasmid alleles. We investigate the implications of random genetic drift of multicopy plasmids during cell division-termed here &quot;segregational drift&quot;-to plasmid evolution. Performing experimental evolution of low- and high-copy non-mobile plasmids in Escherichia coli, we find that the evolutionary rate of multicopy plasmids does not reflect the increased mutational supply expected according to their copy number. In addition, simulated evolution of multicopy plasmid alleles demonstrates that segregational drift leads to increased loss frequency and extended fixation time of plasmid mutations in comparison to haploid chromosomes. Furthermore, an examination of the experimentally evolved hosts reveals a significant impact of the plasmid type on the host chromosome evolution. Our study demonstrates that segregational drift of multicopy plasmids interferes with the retention and fixation of novel plasmid variants. Depending on the selection pressure on newly emerging variants, plasmid genomes may evolve slower than haploid chromosomes, regardless of their higher mutational supply. We suggest that plasmid copy number is an important determinant of plasmid evolvability due to the manifestation of segregational drift.}, }
@article {pmid30486780, year = {2018}, author = {Fletcher, K and Klosterman, SJ and Derevnina, L and Martin, F and Bertier, LD and Koike, S and Reyes-Chin-Wo, S and Mou, B and Michelmore, R}, title = {Comparative genomics of downy mildews reveals potential adaptations to biotrophy.}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {851}, pmid = {30486780}, issn = {1471-2164}, support = {P30 CA093373/CA/NCI NIH HHS/United States ; S10 OD018223/OD/NIH HHS/United States ; S10 RR026825/RR/NCRR NIH HHS/United States ; Endowed Chair in Genomics//Novozymes Inc./ ; C06 RR012088/RR/NCRR NIH HHS/United States ; }, mesh = {Adaptation, Physiological/*genetics ; *Genomics ; Heterozygote ; Likelihood Functions ; Mitochondria/genetics ; Molecular Sequence Annotation ; Peronospora/*genetics/pathogenicity ; Phylogeny ; Plant Diseases/*microbiology ; Sequence Analysis, RNA ; Terminal Repeat Sequences/genetics ; }, abstract = {BACKGROUND: Spinach downy mildew caused by the oomycete Peronospora effusa is a significant burden on the expanding spinach production industry, especially for organic farms where synthetic fungicides cannot be deployed to control the pathogen. P. effusa is highly variable and 15 new races have been recognized in the past 30 years.<br><br>RESULTS: We virulence phenotyped, sequenced, and assembled two isolates of P. effusa from the Salinas Valley, California, U.S.A. that were identified as race 13 and 14. These assemblies are high quality in comparison to assemblies of other downy mildews having low total scaffold count (784 &amp; 880), high contig N50s (48 kb &amp; 52 kb), high BUSCO completion and low BUSCO duplication scores and share many syntenic blocks with Phytophthora species. Comparative analysis of four downy mildew and three Phytophthora species revealed parallel absences of genes encoding conserved domains linked to transporters, pathogenesis, and carbohydrate activity in the biotrophic species. Downy mildews surveyed that have lost the ability to produce zoospores have a common loss of flagella/motor and calcium domain encoding genes. Our phylogenomic data support multiple origins of downy mildews from hemibiotrophic progenitors and suggest that common gene losses in these downy mildews may be of genes involved in the necrotrophic stages of Phytophthora spp.<br><br>CONCLUSIONS: We present a high-quality draft genome of Peronospora effusa that will serve as a reference for Peronospora spp. We identified several Pfam domains as under-represented in the downy mildews consistent with the loss of zoosporegenesis and necrotrophy. Phylogenomics provides further support for a polyphyletic origin of downy mildews.}, }
@article {pmid30486096, year = {2018}, author = {Agarwal, I and Mahony, S and Giri, VB and Chaitanya, R and Bauer, AM}, title = {Six new Cyrtodactylus (Squamata: Gekkonidae) from northeast India.}, journal = {Zootaxa}, volume = {4524}, number = {5}, pages = {501-535}, doi = {10.11646/zootaxa.4524.5.1}, pmid = {30486096}, issn = {1175-5334}, mesh = {Animals ; *Color ; India ; *Lizards ; Mitochondria ; Myanmar ; Phylogeny ; }, abstract = {We use mitochondrial sequence data to identify divergent lineages within the gekkonid genus Cyrtodactylus in northeast India and use morphological data to describe six new species from within the Indo-Burma clade of Cyrtodactylus. The new species share an irregular colour pattern but differ from described species from the region in morphology and mitochondrial sequence data (>11 % uncorrected pairwise sequence divergence). Three new species are from along the Brahmaputra River and three are from mountains south of the Brahmaputra, including the largest Cyrtodactylus from India and the fifth gecko to be described from a major Indian city, Guwahati.}, }
@article {pmid30484227, year = {2018}, author = {Trosko, JE}, title = {The Role of the Mitochondria in the Evolution of Stem Cells, Including MUSE Stem Cells and Their Biology.}, journal = {Advances in experimental medicine and biology}, volume = {1103}, number = {}, pages = {131-152}, doi = {10.1007/978-4-431-56847-6_7}, pmid = {30484227}, issn = {0065-2598}, abstract = {From the transition of single-cell organisms to multicellularity of metazoans, evolutionary pressures selected new genes and phenotypes to cope with the oxygenation of the Earth's environment, especially via the symbiotic acquisition of the mitochondrial organelle. There were many new genes and phenotypes that appeared, namely, stem cells, low-oxygen-micro-environments to house these genes (&quot;niches&quot;), new epigenetic mechanisms to regulate , selectively, the gene repertoire to control proliferation, differentiation, apoptosis, senescence and DNA protection mechanisms, including antioxidant genes and DNA repair. This transition required a critical regulation of the metabolism of glucose to produce energy for both the stem cell quiescent state and the energy-requiring differentiated state. While the totipotent-, embryonic-, pluripotent-, and a few adult organ-specific stem cells were recognized, only relatively recently, because of the isolation of somatic cell nuclear transfer (SCNT) stem cells and &quot;induced pluripotent stem&quot; cells, challenges to the origin of these &quot;iPS&quot; cells have been made. The isolation and characterization of human MUSE stem cells and more adult organ-specific adult stem cells have indicated that these MUSE cells have many shared characteristics of the &quot;iPS&quot; cells, yet they do not form teratomas but can give rise to the trigeminal cell layers. While the MUSE cells are a subset of human fibroblastic cells, they have not been characterized, yet, for the mitochondrial metabolic genes, either in the stem cell state or during their differentiation processes. A description of other human adult stem cells will be made to set future studies of how the MUSE stem cells compare to all other stem cells.}, }
@article {pmid30481564, year = {2019}, author = {Xie, B and Wang, S and Jiang, N and Li, JJ}, title = {Cyclin B1/CDK1-regulated mitochondrial bioenergetics in cell cycle progression and tumor resistance.}, journal = {Cancer letters}, volume = {443}, number = {}, pages = {56-66}, doi = {10.1016/j.canlet.2018.11.019}, pmid = {30481564}, issn = {1872-7980}, abstract = {A mammalian cell houses two genomes located separately in the nucleus and mitochondria. During evolution, communications and adaptations between these two genomes occur extensively to achieve and sustain homeostasis for cellular functions and regeneration. Mitochondria provide the major cellular energy and contribute to gene regulation in the nucleus, whereas more than 98% of mitochondrial proteins are encoded by the nuclear genome. Such two-way signaling traffic presents an orchestrated dynamic between energy metabolism and consumption in cells. Recent reports have elucidated the way how mitochondrial bioenergetics synchronizes with the energy consumption for cell cycle progression mediated by cyclin B1/CDK1 as the communicator. This review is to recapitulate cyclin B1/CDK1 mediated mitochondrial activities in cell cycle progression and stress response as well as its potential link to reprogram energy metabolism in tumor adaptive resistance. Cyclin B1/CDK1-mediated mitochondrial bioenergetics is applied as an example to show how mitochondria could timely sense the cellular fuel demand and then coordinate ATP output. Such nucleus-mitochondria oscillation may play key roles in the flexible bioenergetics required for tumor cell survival and compromising the efficacy of anti-cancer therapy. Further deciphering the cyclin B1/CDK1-controlled mitochondrial metabolism may invent effect targets to treat resistant cancers.}, }
@article {pmid30480548, year = {2018}, author = {Melvin, RG and Lamichane, N and Havula, E and Kokki, K and Soeder, C and Jones, CD and Hietakangas, V}, title = {Natural variation in sugar tolerance associates with changes in signaling and mitochondrial ribosome biogenesis.}, journal = {eLife}, volume = {7}, number = {}, pages = {}, doi = {10.7554/eLife.40841}, pmid = {30480548}, issn = {2050-084X}, mesh = {Animals ; Cellular Reprogramming/genetics ; Diet/methods ; Dietary Sugars/administration &amp; dosage/*metabolism ; Drosophila/drug effects/*genetics/metabolism ; Drosophila Proteins/genetics/metabolism ; Drosophila simulans/drug effects/*genetics/metabolism ; Drug Tolerance/*genetics ; Gene Expression Regulation ; Genetic Variation ; *Genome, Insect ; Larva/drug effects/genetics/metabolism ; Metabolic Networks and Pathways/genetics ; Mitochondria/metabolism ; Organelle Biogenesis ; Protein Phosphatase 1/genetics/metabolism ; Ribosomes/drug effects/metabolism ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/genetics/metabolism ; *Signal Transduction ; Species Specificity ; }, abstract = {How dietary selection affects genome evolution to define the optimal range of nutrient intake is a poorly understood question with medical relevance. We have addressed this question by analyzing Drosophila simulans and sechellia, recently diverged species with differential diet choice. D. sechellia larvae, specialized to a nutrient scarce diet, did not survive on sugar-rich conditions, while the generalist species D. simulans was sugar tolerant. Sugar tolerance in D. simulans was a tradeoff for performance on low-energy diet and was associated with global reprogramming of metabolic gene expression. Hybridization and phenotype-based introgression revealed the genomic regions of D. simulans that were sufficient for sugar tolerance. These regions included genes that are involved in mitochondrial ribosome biogenesis and intracellular signaling, such as PPP1R15/Gadd34 and SERCA, which contributed to sugar tolerance. In conclusion, genomic variation affecting genes involved in global metabolic control defines the optimal range for dietary macronutrient composition.}, }
@article {pmid30474737, year = {2019}, author = {Guo, J and Miao, X and He, P and Li, M and Wang, S and Cui, J and Huang, C and He, L and Zhao, J}, title = {Babesia gibsoni endemic to Wuhan, China: mitochondrial genome sequencing, annotation, and comparison with apicomplexan parasites.}, journal = {Parasitology research}, volume = {118}, number = {1}, pages = {235-243}, doi = {10.1007/s00436-018-6158-2}, pmid = {30474737}, issn = {1432-1955}, support = {2017YFD0500402//National Key Research and Development Program of China/ ; 2015CB150300//National Basic Science Research Program (973 program) of China/ ; 31772729//National Natural Science Foundation of China/ ; 2017CFA020//Natural Science Foundation of Hubei Province/ ; }, mesh = {Amino Acid Sequence ; Animals ; Apicomplexa/classification/genetics/isolation &amp; purification ; Babesia/classification/genetics/*isolation &amp; purification ; Babesiosis/*parasitology ; China/epidemiology ; Cytochromes b/genetics ; DNA Primers/genetics ; Dog Diseases/*parasitology ; Dogs ; *Genome, Mitochondrial ; Molecular Sequence Annotation ; Phylogeny ; Protozoan Infections, Animal/epidemiology/*parasitology ; Sequence Analysis, DNA ; }, abstract = {Babesia gibsoni (B. gibsoni), an intracellular apicomplexan protozoan, poses great threat to canine health. Currently, little information is available about the B. gibsoni (WH58) endemic to Wuhan, China. Here, the mitochondrial (mt) genome of B. gibsoni (WH58) was amplified by five pairs of primers and sequenced and annotated by alignment with the reported mt genome sequences of Babesia canis (B. canis, KC207822), Babesia orientalis (KF218819), Babesia bovis (AB499088), and Theileria equi (AB499091). The evolutionary relationships were analyzed with the amino acid sequences of cytochrome c oxidase I (cox1) and cytochrome b (cob) genes in apicomplexan parasite species. Additionally, the mt genomes of Babesia, Theileria, and Plasmodium spp. were compared in size, host infection, form, distribution, and direction of the protein-coding genes. The full size of the mt genome of B. gibsoni (WH58) was 5865 bp with a linear form, containing terminal-inverted repeats on both ends, six large subunit ribosomal RNA fragments, and three protein-coding genes: cox1, cob, and cytochrome c oxidase III (cox3). Babesia, Theileria, and Plasmodium spp. had a similar mt genome size of about 6000 bp. The mt genomes of parasites that cause canine babesiosis showed a slightly smaller size than the other species. Moreover, Babesia microti (R1 strain) was about 11,100 bp in size, which was twice larger than that of the other species. The mt form was linear for Babesia and Theileria spp. but circular for Plasmodium falciparum and Plasmodium knowlesi. Additionally, all the species contained the three protein-coding genes of cox1, cox3, and cob except Toxoplasma gondii (RH strain) which only contained the cox1 and cob genes. The phylogenetic analysis indicated that B. gibsoni (WH58) was more identical to B. gibsoni (AB499087), B. canis (KC207822), and Babesia rossi (KC207823) and most divergent from Babesia conradae in Babesia spp. Despite the highest similarity to B. gibsoni (AB499087) reported in Japan, B. gibsoni (WH58) showed notable differences in the sequence of nucleotides and amino acids and the property in virulence to host and in vitro cultivation. This study compared the mt genomes of the two B. gibsoni isolates and other parasites in the phylum Apicomplexa and provided new insights into their differences and evolutionary relationships.}, }
@article {pmid30466434, year = {2018}, author = {Petrů, M and Wideman, J and Moore, K and Alcock, F and Palmer, T and Doležal, P}, title = {Evolution of mitochondrial TAT translocases illustrates the loss of bacterial protein transport machines in mitochondria.}, journal = {BMC biology}, volume = {16}, number = {1}, pages = {141}, pmid = {30466434}, issn = {1741-7007}, abstract = {BACKGROUND: Bacteria and mitochondria contain translocases that function to transport proteins across or insert proteins into their inner and outer membranes. Extant mitochondria retain some bacterial-derived translocases but have lost others. While BamA and YidC were integrated into general mitochondrial protein transport pathways (as Sam50 and Oxa1), the inner membrane TAT translocase, which uniquely transports folded proteins across the membrane, was retained sporadically across the eukaryote tree.<br><br>RESULTS: We have identified mitochondrial TAT machinery in diverse eukaryotic lineages and define three different types of eukaryote-encoded TatABC-derived machineries (TatAC, TatBC and TatC-only). Here, we investigate TatAC and TatC-only machineries, which have not been studied previously. We show that mitochondria-encoded TatAC of the jakobid Andalucia godoyi represent the minimal functional pathway capable of substituting for the Escherichia coli TatABC complex and can transport at least one substrate. However, selected TatC-only machineries, from multiple eukaryotic lineages, were not capable of supporting the translocation of this substrate across the bacterial membrane. Despite the multiple losses of the TatC gene from the mitochondrial genome, the gene was never transferred to the cell nucleus. Although the major constraint preventing nuclear transfer of mitochondrial TatC is likely its high hydrophobicity, we show that in chloroplasts, such transfer of TatC was made possible due to modifications of the first transmembrane domain.<br><br>CONCLUSIONS: At its origin, mitochondria inherited three inner membrane translocases Sec, TAT and Oxa1 (YidC) from its bacterial ancestor. Our work shows for the first time that mitochondrial TAT has likely retained its unique function of transporting folded proteins at least in those few eukaryotes with TatA and TatC subunits encoded in the mitochondrial genome. However, mitochondria, in contrast to chloroplasts, abandoned the machinery multiple times in evolution. The overall lower hydrophobicity of the Oxa1 protein was likely the main reason why this translocase was nearly universally retained in mitochondrial biogenesis pathways.}, }
@article {pmid30464337, year = {2018}, author = {Chen, YL and Chen, LJ and Chu, CC and Huang, PK and Wen, JR and Li, HM}, title = {TIC236 links the outer and inner membrane translocons of the chloroplast.}, journal = {Nature}, volume = {564}, number = {7734}, pages = {125-129}, doi = {10.1038/s41586-018-0713-y}, pmid = {30464337}, issn = {1476-4687}, abstract = {The two-membrane envelope is a defining feature of chloroplasts. Chloroplasts evolved from a Gram-negative cyanobacterial endosymbiont. During evolution, genes of the endosymbiont have been transferred to the host nuclear genome. Most chloroplast proteins are synthesized in the cytosol as higher-molecular-mass preproteins with an N-terminal transit peptide. Preproteins are transported into chloroplasts by the TOC and TIC (translocons at the outer- and inner-envelope membranes of chloroplasts, respectively) machineries1,2, but how TOC and TIC are assembled together is unknown. Here we report the identification of the TIC component TIC236; TIC236 is an integral inner-membrane protein that projects a 230-kDa domain into the intermembrane space, which binds directly to the outer-membrane channel TOC75. The knockout mutation of TIC236 is embryonically lethal. In TIC236-knockdown mutants, a smaller amount of the inner-membrane channel TIC20 was associated with TOC75; the amount of TOC-TIC supercomplexes was also reduced. This resulted in a reduced import rate into the stroma, though outer-membrane protein insertion was unaffected. The size and the essential nature of TIC236 indicate that-unlike in mitochondria, in which the outer- and inner-membrane translocons exist as separate complexes and a supercomplex is only transiently assembled during preprotein translocation3,4-a long and stable protein bridge in the intermembrane space is required for protein translocation into chloroplasts. Furthermore, TIC236 and TOC75 are homologues of bacterial inner-membrane TamB5 and outer-membrane BamA, respectively. Our evolutionary analyses show that, similar to TOC75, TIC236 is preserved only in plants and has co-evolved with TOC75 throughout the plant lineage. This suggests that the backbone of the chloroplast protein-import machinery evolved from the bacterial TamB-BamA protein-secretion system.}, }
@article {pmid30446790, year = {2019}, author = {Razzak, MA and Lee, J and Lee, DW and Kim, JH and Yoon, HS and Hwang, I}, title = {Expression of seven carbonic anhydrases in red alga Gracilariopsis chorda and their subcellular localization in a heterologous system, Arabidopsis thaliana.}, journal = {Plant cell reports}, volume = {38}, number = {2}, pages = {147-159}, doi = {10.1007/s00299-018-2356-8}, pmid = {30446790}, issn = {1432-203X}, support = {2016R1E1A1A02922014//Ministry of Fisheries/ ; }, mesh = {Arabidopsis/*genetics ; Carbonic Anhydrases/classification/*metabolism ; Computer Simulation ; Endoplasmic Reticulum/metabolism ; Gene Expression Regulation, Enzymologic ; Glycosylation ; Golgi Apparatus/metabolism ; Green Fluorescent Proteins/metabolism ; Phylogeny ; Plants, Genetically Modified ; Protein Transport ; Protoplasts/metabolism ; Rhodophyta/*enzymology ; Subcellular Fractions/metabolism ; Vacuoles/metabolism ; }, abstract = {KEY MESSAGE: Red alga, Gracilariopsis chorda, contains seven carbonic anhydrases that can be grouped into α-, β- and γ-classes. Carbonic anhydrases (CAHs) are metalloenzymes that catalyze the reversible hydration of CO2. These enzymes are present in all living organisms and play roles in various cellular processes, including photosynthesis. In this study, we identified seven CAH genes (GcCAHs) from the genome sequence of the red alga Gracilariopsis chorda and characterized them at the molecular, cellular and biochemical levels. Based on sequence analysis, these seven isoforms were categorized into four α-class, one β-class, and two γ-class isoforms. RNA sequencing revealed that of the seven CAHs isoforms, six genes were expressed in G. chorda in light at room temperature. In silico analysis revealed that these seven isoforms localized to multiple subcellular locations such as the ER, mitochondria and cytosol. When expressed as green fluorescent protein fusions in protoplasts of Arabidopsis thaliana leaf cells, these seven isoforms showed multiple localization patterns. The four α-class GcCAHs with an N-terminal hydrophobic leader sequence localized to the ER and two of them were further targeted to the vacuole. GcCAHβ1 with no noticeable signal sequence localized to the cytosol. The two γ-class GcCAHs also localized to the cytosol, despite the presence of a predicted presequence. Based on these results, we propose that the red alga G. chorda also employs multiple CAH isoforms for various cellular processes such as photosynthesis.}, }
@article {pmid30445187, year = {2018}, author = {Johnston, IG}, title = {Tension and Resolution: Dynamic, Evolving Populations of Organelle Genomes within Plant Cells.}, journal = {Molecular plant}, volume = {}, number = {}, pages = {}, doi = {10.1016/j.molp.2018.11.002}, pmid = {30445187}, issn = {1752-9867}, abstract = {Mitochondria and plastids form dynamic, evolving populations physically embedded in the fluctuating environment of the plant cell. Their evolutionary heritage has shaped how the cell controls the genetic structure and the physical behavior of its organelle populations. While the specific genes involved in these processes are gradually being revealed, the governing principles underlying this controlled behavior remain poorly understood. As the genetic and physical dynamics of these organelles are central to bioenergetic performance and plant physiology, this challenges both fundamental biology and strategies to engineer better-performing plants. This article reviews current knowledge of the physical and genetic behavior of mitochondria and chloroplasts in plant cells. An overarching hypothesis is proposed whereby organelles face a tension between genetic robustness and individual control and responsiveness, and different species resolve this tension in different ways. As plants are immobile and thus subject to fluctuating environments, their organelles are proposed to favor individual responsiveness, sacrificing genetic robustness. Several notable features of plant organelles, including large genomes, mtDNA recombination, fragmented organelles, and plastid/mitochondrial differences may potentially be explained by this hypothesis. Finally, the ways that quantitative and systems biology can help shed light on the plethora of open questions in this field are highlighted.}, }
@article {pmid30443184, year = {2018}, author = {Dou, X and Chen, L and Lei, M and Zellmer, L and Jia, Q and Ling, P and He, Y and Yang, W and Liao, DJ}, title = {Evaluating the Remote Control of Programmed Cell Death, with or without a Compensatory Cell Proliferation.}, journal = {International journal of biological sciences}, volume = {14}, number = {13}, pages = {1800-1812}, pmid = {30443184}, issn = {1449-2288}, abstract = {Organisms and their different component levels, whether organelle, cellular or other, come by birth and go by death, and the deaths are often balanced by new births. Evolution on the one hand has built demise program(s) in cells of organisms but on the other hand has established external controls on the program(s). For instance, evolution has established death program(s) in animal cells so that the cells can, when it is needed, commit apoptosis or senescent death (SD) in physiological situations and stress-induced cell death (SICD) in pathological situations. However, these programmed cell deaths are not predominantly regulated by the cells that do the dying but, instead, are controlled externally and remotely by the cells' superior(s), i.e. their host tissue or organ or even the animal's body. Currently, it is still unclear whether a cell has only one death program or has several programs respectively controlling SD, apoptosis and SICD. In animals, apoptosis exterminates, in a physiological manner, healthy but no-longer needed cells to avoid cell redundancy, whereas suicidal SD and SICD, like homicidal necrosis, terminate ill but useful cells, which may be followed by regeneration of the live cells and by scar formation to heal the damaged organ or tissue. Therefore, &quot;who dies&quot; clearly differentiates apoptosis from SD, SICD and necrosis. In animals, apoptosis can occur only in those cell types that retain a lifelong ability of proliferation and never occurs in those cell types that can no longer replicate in adulthood. In cancer cells, SICD is strengthened, apoptosis is dramatically weakened while SD has been lost. Most published studies professed to be about apoptosis are actually about SICD, which has four basic and well-articulated pathways involving caspases or involving pathological alterations in the mitochondria, endoplasmic reticula, or lysosomes.}, }
@article {pmid30421421, year = {2019}, author = {Patten, MM}, title = {The X chromosome favors males under sexually antagonistic selection.}, journal = {Evolution; international journal of organic evolution}, volume = {73}, number = {1}, pages = {84-91}, doi = {10.1111/evo.13646}, pmid = {30421421}, issn = {1558-5646}, abstract = {The X chromosome is found twice as often in females as males. This has led to an intuition that X-linked genes for traits experiencing sexually antagonistic selection should tend to evolve toward the female optimum. However, this intuition has never been formally examined. In this paper, I present a simple mathematical model and ask whether the X chromosome is indeed biased toward effecting female-optimal phenotypes. Counter to the intuition, I find that the exact opposite bias exists; the X chromosome is revealed to be a welcome spot for mutations that benefit males at the expense of females. Not only do male-beneficial alleles have an easier time of invading and spreading through a population, but they also achieve higher equilibrium frequencies than comparable female-beneficial alleles. The X chromosome is therefore expected over evolutionary time to nudge phenotypes closer to the male optimum. Consequently, the X chromosome should find itself engaged in perpetual intragenomic conflicts with the autosomes and the mitochondria over developmental outcomes. The X chromosome's male bias and the intragenomic conflicts that ensue bear on the evolution of gene regulation, speciation, and our concept of organismality.}, }
@article {pmid30419142, year = {2018}, author = {Muthye, V and Lavrov, DV}, title = {Characterization of mitochondrial proteomes of nonbilaterian animals.}, journal = {IUBMB life}, volume = {70}, number = {12}, pages = {1289-1301}, doi = {10.1002/iub.1961}, pmid = {30419142}, issn = {1521-6551}, support = {//Iowa State University/ ; }, abstract = {Mitochondria require ~1,500 proteins for their maintenance and proper functionality, which constitute the mitochondrial proteome (mt-proteome). Although a few of these proteins, mostly subunits of the electron transport chain complexes, are encoded in mitochondrial DNA (mtDNA), the vast majority are encoded in the nuclear genome and imported to the organelle. Previous studies have shown a continuous and complex evolution of mt-proteome among eukaryotes. However, there was less attention paid to mt-proteome evolution within Metazoa, presumably because animal mtDNA and, by extension, animal mitochondria are often considered to be uniform. In this analysis, two bioinformatic approaches (Orthologue-detection and Mitochondrial Targeting Sequence prediction) were used to identify mt-proteins in 23 species from four nonbilaterian phyla: Cnidaria, Ctenophora, Placozoa, and Porifera, as well as two choanoflagellates, the closest animal relatives. Our results revealed a large variation in mt-proteome in nonbilaterian animals in size and composition. Myxozoans, highly reduced cnidarian parasites, possessed the smallest inferred mitochondrial proteomes, while calcareous sponges possessed the largest. About 513 mitochondrial orthologous groups were present in all nonbilaterian phyla and human. Interestingly, 42 human mitochondrial proteins were not identified in any nonbilaterian species studied and represent putative innovations along the bilaterian branch. Several of these proteins were involved in apoptosis and innate immunity, two processes known to evolve within Metazoa. Conversely, several proteins identified as mitochondrial in nonbilaterian phyla and animal outgroups were absent in human, representing cases of possible loss. Finally, a few human cytosolic proteins, such as histones and cytosolic ribosomal proteins, were predicted to be targeted to mitochondria in nonbilaterian animals. Overall, our analysis provides the first step in characterization of mt-proteomes in nonbilaterian animals and understanding evolution of animal mt-proteome. © 2018 IUBMB Life, 70(12):1289-1301, 2018.}, }
@article {pmid30417348, year = {2019}, author = {Lasne, C and Van Heerwaarden, B and Sgrò, CM and Connallon, T}, title = {Quantifying the relative contributions of the X chromosome, autosomes, and mitochondrial genome to local adaptation.}, journal = {Evolution; international journal of organic evolution}, volume = {73}, number = {2}, pages = {262-277}, doi = {10.1111/evo.13647}, pmid = {30417348}, issn = {1558-5646}, abstract = {During local adaptation with gene flow, some regions of the genome are inherently more responsive to selection than others. Recent theory predicts that X-linked genes should disproportionately contribute to local adaptation relative to other genomic regions, yet this prediction remains to be tested. We carried out a multigeneration crossing scheme, using two cline-end populations of Drosophila melanogaster, to estimate the relative contributions of the X chromosome, autosomes, and mitochondrial genome to divergence in four traits involved in local adaptation (wing size, resistance to heat, desiccation, and starvation stresses). We found that the mitochondrial genome and autosomes contributed significantly to clinal divergence in three of the four traits. In contrast, the X made no significant contribution to divergence in these traits. Given the small size of the mitochondrial genome, our results indicate that it plays a surprisingly large role in clinal adaptation. In contrast, the X, which represents roughly 20% of the Drosophila genome, contributes negligibly-a pattern that conflicts with theoretical predictions. These patterns reinforce recent work implying a central role of mitochondria in climatic adaptation, and suggest that different genomic regions may play fundamentally different roles in processes of divergence with gene flow.}, }
@article {pmid30395972, year = {2019}, author = {Fan, PC and Zhang, Y and Wang, Y and Wei, W and Zhou, YX and Xie, Y and Wang, X and Qi, YZ and Chang, L and Jia, ZP and Zhou, Z and Guan, H and Zhang, H and Xu, P and Zhou, PK}, title = {Quantitative proteomics reveals mitochondrial respiratory chain as a dominant target for carbon ion radiation: Delayed reactive oxygen species generation caused DNA damage.}, journal = {Free radical biology &amp; medicine}, volume = {130}, number = {}, pages = {436-445}, doi = {10.1016/j.freeradbiomed.2018.10.449}, pmid = {30395972}, issn = {1873-4596}, abstract = {Heavy ion radiotherapy has shown great promise for cancer therapy. Understanding the cellular response mechanism to heavy ion radiation is required to explore measures of overcoming devastating side effects. Here, we performed a quantitative proteomic analysis to investigate the mechanism of carbon ion irradiation on human AHH-1 lymphoblastoid cells. We identified 4602 proteins and quantified 4569 proteins showing high coverage in the mitochondria. Data are available via ProteomeXchange with identifier PXD008351. After stringent filtering, 290 proteins were found to be significantly up-regulated and 16 proteins were down-regulated. Functional analysis revealed that these up-regulated proteins were enriched in the process of DNA damage repair, mitochondrial ribosome, and particularly mitochondrial respiratory chain, accounting for approximately 50% of the accumulated proteins. Bioinformatics and functional analysis demonstrated that these up-regulated mitochondrial respiratory chain proteins enhanced ATP production and simultaneously reactive oxygen species release. More importantly, increased reactive oxygen species led to secondary organelle injury and lagged DNA double-strand breaks. Consistently, the expression of antioxidant enzymes was up-regulated for free radical scavenging. The mechanism of lagged secondary injury originated from disturbances in the mitochondrial respiratory chain. Our results provided a novel target for cell self-repair against heavy ion radiation-induced cellular damage.}, }
@article {pmid30394643, year = {2018}, author = {Rand, DM and Mossman, JA and Zhu, L and Biancani, LM and Ge, JY}, title = {Mitonuclear epistasis, genotype-by-environment interactions, and personalized genomics of complex traits in Drosophila.}, journal = {IUBMB life}, volume = {70}, number = {12}, pages = {1275-1288}, pmid = {30394643}, issn = {1521-6551}, support = {2R01GM067862/GF/NIH HHS/United States ; //Brown University/ ; R01 GM067862/GM/NIGMS NIH HHS/United States ; NIA grant 1R01AG027849NIH grant 2R01GM067862/GF/NIH HHS/United States ; R01 AG027849/AG/NIA NIH HHS/United States ; 1R01AG027849/GF/NIH HHS/United States ; }, abstract = {Mitochondrial function requires the coordinated expression of dozens of gene products from the mitochondrial genome and hundreds from the nuclear genomes. The systems that emerge from these interactions convert the food we eat and the oxygen we breathe into energy for life, while regulating a wide range of other cellular processes. These facts beg the question of whether the gene-by-gene interactions (G x G) that enable mitochondrial function are distinct from the gene-by-environment interactions (G x E) that fuel mitochondrial activity. We examine this question using a Drosophila model of mitonuclear interactions in which experimental combinations of mtDNA and nuclear chromosomes generate pairs of mitonuclear genotypes to test for epistatic interactions (G x G). These mitonuclear genotypes are then exposed to altered dietary or oxygen environments to test for G x E interactions. We use development time to assess dietary effects, and genome wide RNAseq analyses to assess hypoxic effects on transcription, which can be partitioned in to mito, nuclear, and environmental (G x G x E) contributions to these complex traits. We find that mitonuclear epistasis is universal, and that dietary and hypoxic treatments alter the epistatic interactions. We further show that the transcriptional response to alternative mitonuclear interactions has significant overlap with the transcriptional response to alternative oxygen environments. Gene coexpression analyses suggest that these shared genes are more central in networks of gene interactions, implying some functional overlap between epistasis and genotype by environment interactions. These results are discussed in the context of evolutionary fitness, the genetic basis of complex traits, and the challenge of achieving precision in personalized medicine. © 2018 The Authors. IUBMB Life published by Wiley Periodicals, Inc. on behalf of International Union of Biochemistry and Molecular Biology, 70(12):1275-1288, 2018.}, }
@article {pmid30391331, year = {2019}, author = {Xu, L and Peng, L and Gu, T and Yu, D and Yao, YG}, title = {The 3'UTR of human MAVS mRNA contains multiple regulatory elements for the control of protein expression and subcellular localization.}, journal = {Biochimica et biophysica acta. Gene regulatory mechanisms}, volume = {1862}, number = {1}, pages = {47-57}, doi = {10.1016/j.bbagrm.2018.10.017}, pmid = {30391331}, issn = {1876-4320}, abstract = {Post-transcriptional regulation controls the mRNA stability, translation efficiency, and subcellular localization of a protein. The mitochondrial antiviral signaling protein (MAVS) plays a vital role in innate antiviral immunity. The MAVS mRNA has a long 3' untranslated region (UTR, >9 kb) and an understanding of this region may help to explain the post-transcriptional regulation in a key protein. In this study, we aimed to characterize the role of the MAVS 3'UTR during MAVS expression by truncating the 3'UTR into different fragments so as to identify the regulatory elements. We found that the different fragments (H1-H5) of the MAVS 3'UTR play different roles in regulating the subcellular localization and function of MAVS. Three AU-rich elements (AREs) in the MAVS 3'UTR H1 fragment (region 1-3445 in the 3'UTR) repressed MAVS expression by interacting with HuR to destabilize its mRNA. The MAVS 3'UTR H5 fragment (region 5955-7687 in the 3'UTR) affected the cellular localization of MAVS in mitochondria and influenced the subsequent antiviral function. Four miR-27a binding sites were recognized in the MAVS 3'UTR, and treatment of miR-27a inhibited MAVS expression and promoted the replication of the vesicular stomatitis virus (VSV). The identification of multiple regulatory elements in the MAVS 3'UTR offers new insights into the precise control of MAVS expression in innate immunity.}, }
@article {pmid30390623, year = {2018}, author = {Portugez, S and Martin, WF and Hazkani-Covo, E}, title = {Mosaic mitochondrial-plastid insertions into the nuclear genome show evidence of both non-homologous end joining and homologous recombination.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {162}, pmid = {30390623}, issn = {1471-2148}, mesh = {Base Sequence ; Cell Nucleus/*genetics ; DNA End-Joining Repair/*genetics ; DNA, Mitochondrial/genetics ; *Genome, Plant ; Homologous Recombination/*genetics ; Mitochondria/*genetics ; *Mosaicism ; Mutagenesis, Insertional/*genetics ; Plastids/*genetics ; }, abstract = {BACKGROUND: Mitochondrial and plastid DNA fragments are continuously transferred into eukaryotic nuclear genomes, giving rise to nuclear copies of mitochondrial DNA (numts) and nuclear copies of plastid DNA (nupts). Numts and nupts are classified as simple if they are composed of a single organelle fragment or as complex if they are composed of multiple fragments. Mosaic insertions are complex insertions composed of fragments of both mitochondrial and plastid DNA. Simple numts and nupts in eukaryotes have been extensively studied, their mechanism of insertion involves non-homologous end joining (NHEJ). Mosaic insertions have been less well-studied and their mechanisms of integration are unknown.<br><br>RESULTS: Here we estimated the number of nuclear mosaic insertions (numins) in nine plant genomes. We show that numins compose up to 10% of the total nuclear insertions of organelle DNA in these plant genomes. The NHEJ hallmarks typical for numts and nupts were also identified in mosaic insertions. However, the number of identified insertions that integrated via NHEJ mechanism is underestimated, as NHEJ signatures are conserved only in recent insertions and mutationally eroded in older ones. A few complex insertions show signatures of long homology that cannot be attributed to NHEJ, a novel observation that implicates gene conversion or single strand annealing mechanisms in organelle nuclear insertions.<br><br>CONCLUSIONS: The common NHEJ signature that was identified here reveals that, in plant cells, mitochondria and plastid fragments in numins must meet during or prior to integration into the nuclear genome.}, }
@article {pmid30385634, year = {2018}, author = {Loell, K and Nanda, V}, title = {Marginal protein stability drives subcellular proteome isoelectric point.}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {115}, number = {46}, pages = {11778-11783}, pmid = {30385634}, issn = {1091-6490}, support = {80NSSC18K0093/ImNASA/Intramural NASA/United States ; DP2 OD006478/OD/NIH HHS/United States ; }, mesh = {Computer Simulation ; Databases, Protein ; Evolution, Molecular ; Humans ; Hydrogen-Ion Concentration ; Isoelectric Point ; Lysosomes/metabolism ; Protein Folding ; Protein Stability ; Proteome/*chemistry/metabolism ; Proteomics/*methods ; Subcellular Fractions/chemistry/metabolism ; }, abstract = {There exists a positive correlation between the pH of subcellular compartments and the median isoelectric point (pI) for the associated proteomes. Proteins in the human lysosome-a highly acidic compartment in the cell-have a median pI of ∼6.5, whereas proteins in the more basic mitochondria have a median pI of ∼8.0. Proposed mechanisms reflect potential adaptations to pH. For example, enzyme active site general acid/base residue pKs are likely evolved to match environmental pH. However, such effects would be limited to a few residues on specific proteins, and might not affect the proteome at large. A protein model that considers residue burial upon folding recapitulates the correlation between proteome pI and environmental pH. This correlation can be fully described by a neutral evolution process; no functional selection is included in the model. Proteins in acidic environments incur a lower energetic penalty for burying acidic residues than basic residues, resulting in a net accumulation of acidic residues in the protein core. The inverse is true under alkaline conditions. The pI distributions of subcellular proteomes are likely not a direct result of functional adaptations to pH, but a molecular spandrel stemming from marginal stability.}, }
@article {pmid30378025, year = {2018}, author = {Gabaldón, T}, title = {Evolution of the Peroxisomal Proteome.}, journal = {Sub-cellular biochemistry}, volume = {89}, number = {}, pages = {221-233}, doi = {10.1007/978-981-13-2233-4_9}, pmid = {30378025}, issn = {0306-0225}, abstract = {Peroxisomes are single-membrane bound intracellular organelles that can be found in organisms across the tree of eukaryotes, and thus are likely to derive from an ancestral peroxisome in the last eukaryotic common ancestor (LECA). Yet, peroxisomes in different lineages can present a large diversity in terms of their metabolic capabilities, which reflects a highly variable proteomic content. Theories on the evolutionary origin of peroxisomes have shifted in the last decades from scenarios involving an endosymbiotic origin, similar to those of mitochondria and plastids, towards hypotheses purporting an endogenous origin from within the endomembrane system. The peroxisomal proteome is highly dynamic in evolutionary terms, and can evolve via differential loss and gain of proteins, as well as via relocalization of proteins from and to other sub-cellular compartments. Here, I review current knowledge and discussions on the diversity, origin, and evolution of the peroxisomal proteome.}, }
@article {pmid30377874, year = {2018}, author = {Cai, C and Liu, F and Jiang, T and Wang, L and Jia, R and Zhou, L and Gu, K and Ren, J and He, P}, title = {Comparative study on mitogenomes of green tide algae.}, journal = {Genetica}, volume = {146}, number = {6}, pages = {529-540}, pmid = {30377874}, issn = {1573-6857}, support = {18ZR1417400//Shanghai Natural Science Fund/ ; 41576163//National Natural Science Foundation of China/ ; 2016YFC1402105//National Key R&amp;D Program of China/ ; MATHAB2017010//Key Laboratory of Integrated Marine Monitoring and Applied Technologies for Harmful Algal Blooms, S.O.A./ ; }, mesh = {Codon/genetics ; Evolution, Molecular ; *Genome, Mitochondrial ; Microsatellite Repeats ; Open Reading Frames ; RNA, Transfer/genetics ; Sequence Homology, Nucleic Acid ; Ulva/classification/*genetics ; }, abstract = {Since 2007, the annual green tide disaster in the Yellow Sea has brought serious economic losses to China. There is no research on the genetic similarities of four constituent species of green tide algae at the genomic level. We previously determined the mitochondrial genomes of Ulva prolifera, Ulva linza and Ulva flexuosa. In the present work, the mitochondrial genome of another green tide (Ulva compressa) was sequenced and analyzed. With the length of 62,311 bp, it contained 29 encoding genes, 26 tRNAs and 10 open reading frames. By comparing these four mitochondrial genomes, we found that U. compressa was quite different from the other three types of Ulva species. However, there were similarities between U. prolifera and U. linza in the number, distribution and homology of open reading frames, evolutionary and codon variation of tRNA, evolutionary relationship and selection pressure of coding genes. Repetitive sequence analysis of simple sequence repeats, tandem repeat and forward repeats further supposed that they have evolved from the same origin. In addition, we directly analyzed gene homologies and translocation of four green tide algae by Mauve alignment. There were gene order rearrangements among them. With fast-evolving genomes, these four green algal mitochondria have both conservatism and variation, thus opening another window for the understanding of origin and evolution of Ulva.}, }
@article {pmid30373839, year = {2018}, author = {Mehta, AP and Supekova, L and Chen, JH and Pestonjamasp, K and Webster, P and Ko, Y and Henderson, SC and McDermott, G and Supek, F and Schultz, PG}, title = {Engineering yeast endosymbionts as a step toward the evolution of mitochondria.}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {115}, number = {46}, pages = {11796-11801}, pmid = {30373839}, issn = {1091-6490}, support = {P41 GM103445/GM/NIGMS NIH HHS/United States ; }, mesh = {Adenosine Triphosphate/metabolism ; Amino Acid Sequence ; Bioengineering/*methods ; Biological Evolution ; Escherichia coli/genetics/metabolism ; Mitochondria/*genetics/metabolism ; Models, Biological ; Saccharomyces cerevisiae/genetics/metabolism ; Symbiosis/*genetics ; Thiamine/metabolism ; }, abstract = {It has been hypothesized that mitochondria evolved from a bacterial ancestor that initially became established in an archaeal host cell as an endosymbiont. Here we model this first stage of mitochondrial evolution by engineering endosymbiosis between Escherichia coli and Saccharomyces cerevisiae An ADP/ATP translocase-expressing E. coli provided ATP to a respiration-deficient cox2 yeast mutant and enabled growth of a yeast-E. coli chimera on a nonfermentable carbon source. In a reciprocal fashion, yeast provided thiamin to an endosymbiotic E. coli thiamin auxotroph. Expression of several SNARE-like proteins in E. coli was also required, likely to block lysosomal degradation of intracellular bacteria. This chimeric system was stable for more than 40 doublings, and GFP-expressing E. coli endosymbionts could be observed in the yeast by fluorescence microscopy and X-ray tomography. This readily manipulated system should allow experimental delineation of host-endosymbiont adaptations that occurred during evolution of the current, highly reduced mitochondrial genome.}, }
@article {pmid30368957, year = {2018}, author = {Olsson, M and Friesen, CR and Rollings, N and Sudyka, J and Lindsay, W and Whittington, CM and Wilson, M}, title = {Long-term effects of superoxide and DNA repair on lizard telomeres.}, journal = {Molecular ecology}, volume = {27}, number = {24}, pages = {5154-5164}, doi = {10.1111/mec.14913}, pmid = {30368957}, issn = {1365-294X}, support = {//Swedish Science Council/ ; //Australian Research Council/ ; }, abstract = {Telomeres are the non-coding protein-nucleotide &quot;caps&quot; at chromosome ends that contribute to chromosomal stability by protecting the coding parts of the linear DNA from shortening at cell division, and from erosion by reactive molecules. Recently, there has been some controversy between molecular and cell biologists, on the one hand, and evolutionary ecologists on the other, regarding whether reactive molecules erode telomeres during oxidative stress. Many studies of biochemistry and medicine have verified these relationships in cell culture, but other researchers have failed to find such effects in free-living vertebrates. Here, we use a novel approach to measure free radicals (superoxide), mitochondrial &quot;content&quot; (a combined measure of mitochondrial number and size in cells), telomere length and DNA damage at two primary time points during the mating season of an annual lizard species (Ctenophorus pictus). Superoxide levels early in the mating season vary widely and elevated levels predict shorter telomeres both at that time as well as several months later. These effects are likely driven by mitochondrial content, which significantly impacts late season superoxide (cells with more mitochondria have more superoxide), but superoxide effects on telomeres are counteracted by DNA repair as revealed by 8-hydroxy-2'-deoxyguanosine assays. We conclude that reactive oxygen species and DNA repair are fundamental for both short- and long-term regulation of lizard telomere length with pronounced effects of early season cellular stress detectable on telomere length near lizard death.}, }
@article {pmid30364957, year = {2018}, author = {Lee, JM and Song, HJ and Park, SI and Lee, YM and Jeong, SY and Cho, TO and Kim, JH and Choi, HG and Choi, CG and Nelson, WA and Fredericq, S and Bhattacharya, D and Yoon, HS}, title = {Mitochondrial and Plastid Genomes from Coralline Red Algae Provide Insights into the Incongruent Evolutionary Histories of Organelles.}, journal = {Genome biology and evolution}, volume = {10}, number = {11}, pages = {2961-2972}, pmid = {30364957}, issn = {1759-6653}, mesh = {*Biological Evolution ; *Genome, Mitochondrial ; *Genome, Plastid ; Rhodophyta/*genetics ; }, abstract = {Mitochondria and plastids are generally uniparentally inherited and have a conserved gene content over hundreds of millions of years, which makes them potentially useful phylogenetic markers. Organelle single gene-based trees have long been the basis for elucidating interspecies relationships that inform taxonomy. More recently, high-throughput genome sequencing has enabled the construction of massive organelle genome databases from diverse eukaryotes, and these have been used to infer species relationships in deep evolutionary time. Here, we test the idea that despite their expected utility, conflicting phylogenetic signal may exist in mitochondrial and plastid genomes from the anciently diverged coralline red algae (Rhodophyta). We generated complete organelle genome data from five coralline red algae (Lithothamnion sp., Neogoniolithon spectabile, Renouxia sp., Rhodogorgon sp., and Synarthrophyton chejuensis) for comparative analysis with existing organelle genome data from two other species (Calliarthron tuberculosum and Sporolithon durum). We find strong evidence for incongruent phylogenetic signal from both organelle genomes that may be explained by incomplete lineage sorting that has maintained anciently derived gene copies or other molecular evolutionary processes such as hybridization or gene flow during the evolutionary history of coralline red algae.}, }
@article {pmid30358111, year = {2018}, author = {Yu, J and Zhang, L and Li, Y and Zhu, X and Xu, S and Zhou, XM and Wang, H and Zhang, H and Liang, B and Liu, P}, title = {The Adrenal Lipid Droplet is a New Site for Steroid Hormone Metabolism.}, journal = {Proteomics}, volume = {18}, number = {23}, pages = {e1800136}, doi = {10.1002/pmic.201800136}, pmid = {30358111}, issn = {1615-9861}, support = {2016YFA0500100//National Key R&amp;D Program of China/ ; XDA12040218//Strategic Priority Research Program of the Chinese Academy of Sciences/ ; XDB13030600//Strategic Priority Research Program of the Chinese Academy of Sciences/ ; U1402225//National Natural Science Foundation of China/ ; U1702288//National Natural Science Foundation of China/ ; U1702287//National Natural Science Foundation of China/ ; 31571388//National Natural Science Foundation of China/ ; 31671402//National Natural Science Foundation of China/ ; 31671233//National Natural Science Foundation of China/ ; 31671230//National Natural Science Foundation of China/ ; 31701018//National Natural Science Foundation of China/ ; 81700520,//National Natural Science Foundation of China/ ; 81471082//National Natural Science Foundation of China/ ; CAS16SC01//CAS-Croucher Joint Laboratory Project/ ; 2017FA007//Yunnan Applied Basic Research Projects/ ; 2018FB117//Yunnan Applied Basic Research Projects/ ; 2015HA039//Yunnan Oversea High-level Talents Program/ ; 2015HA040//Yunnan Oversea High-level Talents Program/ ; }, abstract = {Steroid hormones play essential roles for living organisms. It has been long and well established that the endoplasmic reticulum (ER) and mitochondria are essential sites for steroid hormone biosynthesis because several steroidogenic enzymes are located in these organelles. The adrenal gland lipid droplet (LD) proteomes from human, macaque monkey, and rodent are analyzed, revealing that steroidogenic enzymes are also present in abundance on LDs. The enzymes found include 3β-hydroxysteroid dehydrogenase (HSD3B) and estradiol 17β-dehydrogenase 11 (HSD17B11). Analyses by Western blot and subcellular localization consistently demonstrate that HSD3B2 is localized on LDs. Furthermore, in vitro experiments confirm that the isolated LDs from HeLa cell stably expressing HSD3B2 or from rat adrenal glands have the capacity to convert pregnenolone to progesterone. Collectively, these data suggest that LDs may be important sites of steroid hormone metabolism. These findings may bring novel insights into the biosynthesis and metabolism of steroid hormones and the development of treatments for adrenal disorders.}, }
@article {pmid30358065, year = {2018}, author = {Paris, Z and Alfonzo, JD}, title = {How the intracellular partitioning of tRNA and tRNA modification enzymes affects mitochondrial function.}, journal = {IUBMB life}, volume = {70}, number = {12}, pages = {1207-1213}, doi = {10.1002/iub.1957}, pmid = {30358065}, issn = {1521-6551}, support = {R01 GM084065/GM/NIGMS NIH HHS/United States ; AI131348/GF/NIH HHS/United States ; GM084065/GF/NIH HHS/United States ; CZ.02.1.01/0.0/0.0/16_019/0000759//ERDF/ESF project Centre for Research of Pathogenicity and Virulence of Parasites/ ; }, abstract = {Organisms have evolved different strategies to seclude certain molecules to specific locations of the cell. This is most pronounced in eukaryotes with their extensive intracellular membrane systems. Intracellular compartmentalization is particularly critical in genome containing organelles, which because of their bacterial evolutionary ancestry still maintain protein-synthesis machinery that resembles more their evolutionary origin than the extant eukaryotic cell they once joined as an endosymbiont. Despite this, it is clear that genome-containing organelles such as the mitochondria are not in isolation and many molecules make it across the mitochondrial membranes from the cytoplasm. In this realm the import of tRNAs and the enzymes that modify them prove most consequential. In this review, we discuss two recent examples of how modifications typically found in cytoplasmic tRNAs affect mitochondrial translation in organisms that forcibly import all their tRNAs from the cytoplasm. In our view, the combination of tRNA import and the compartmentalization of modification enzymes must have played a critical role in the evolution of the organelle. © 2018 IUBMB Life, 70(12):1207-1213, 2018.}, }
@article {pmid30358047, year = {2018}, author = {Gabaldón, T}, title = {Relative timing of mitochondrial endosymbiosis and the &quot;pre-mitochondrial symbioses&quot; hypothesis.}, journal = {IUBMB life}, volume = {70}, number = {12}, pages = {1188-1196}, pmid = {30358047}, issn = {1521-6551}, support = {ERC-2016-724173//H2020 European Research Council/ ; H2020-MSCA-ITN-2014-642095//H2020 Marie Skłodowska-Curie Actions/ ; BFU2015-67107//Secretaría de Estado de Investigación, Desarrollo e Innovación/ ; H2020-MSCA-ITN-2014-642095//Marie Sklodowska-Curie/ ; ERC-2016-724173//European Union's Horizon 2020/ ; SGR857//Catalan Research Agency/ ; //CERCA Programme/Generalitat de Catalunya/ ; //European Regional Development Fund/ ; BFU2015-67107//Spanish Ministry of Economy, Industry, and Competitiveness/ ; SEV-2012-0208//Spanish Ministry of Economy, Industry, and Competitiveness/ ; }, abstract = {The origin of eukaryotes stands as a major open question in biology. Central to this question is the nature and timing of the origin of the mitochondrion, an ubiquitous eukaryotic organelle originated by the endosymbiosis of an alphaproteobacterial ancestor. Different hypotheses disagree, among other aspects, on whether mitochondria were acquired early or late during eukaryogenesis. Similarly, the nature and complexity of the receiving host is debated, with models ranging from a simple prokaryotic host to an already complex proto-eukaryote. Here, I will discuss recent findings from phylogenomics analyses of extant genomes that are shedding light into the evolutionary origins of the eukaryotic ancestor, and which suggest a later acquisition of alpha-proteobacterial derived proteins as compared to those with different bacterial ancestries. I argue that simple eukaryogenesis models that assume a binary symbiosis between an archaeon host and an alpha-proteobacterial proto-mitochondrion cannot explain the complex chimeric nature that is inferred for the eukaryotic ancestor. To reconcile existing hypotheses with the new data, I propose the &quot;pre-mitochondrial symbioses&quot; hypothesis that provides a framework for eukaryogenesis scenarios involving alternative symbiotic interactions that predate the acquisition of mitochondria. © 2018 The Authors. IUBMB Life published by Wiley Periodicals, Inc. on behalf of International Union of Biochemistry and Molecular Biology, 70(12):1188-1196, 2018.}, }
@article {pmid30356218, year = {2018}, author = {Katsyuba, E and Mottis, A and Zietak, M and De Franco, F and van der Velpen, V and Gariani, K and Ryu, D and Cialabrini, L and Matilainen, O and Liscio, P and Giacchè, N and Stokar-Regenscheit, N and Legouis, D and de Seigneux, S and Ivanisevic, J and Raffaelli, N and Schoonjans, K and Pellicciari, R and Auwerx, J}, title = {De novo NAD+ synthesis enhances mitochondrial function and improves health.}, journal = {Nature}, volume = {563}, number = {7731}, pages = {354-359}, doi = {10.1038/s41586-018-0645-6}, pmid = {30356218}, issn = {1476-4687}, mesh = {Animals ; Caenorhabditis elegans/cytology/enzymology/metabolism ; Carboxy-Lyases/antagonists &amp; inhibitors/chemistry/deficiency/*metabolism ; Cell Line ; Choline ; *Conserved Sequence ; Disease Models, Animal ; *Evolution, Molecular ; Female ; Gene Knockdown Techniques ; *Health ; Hepatocytes/cytology/drug effects ; Homeostasis/drug effects ; Humans ; Kidney/cytology/drug effects ; Liver/cytology/drug effects ; Longevity/drug effects ; Male ; Methionine/deficiency ; Mice ; Mice, Inbred C57BL ; Mitochondria/*physiology ; NAD/*biosynthesis ; Non-alcoholic Fatty Liver Disease/physiopathology/prevention &amp; control ; Rats ; Sirtuins/metabolism ; }, abstract = {Nicotinamide adenine dinucleotide (NAD+) is a co-substrate for several enzymes, including the sirtuin family of NAD+-dependent protein deacylases. Beneficial effects of increased NAD+ levels and sirtuin activation on mitochondrial homeostasis, organismal metabolism and lifespan have been established across species. Here we show that α-amino-β-carboxymuconate-ε-semialdehyde decarboxylase (ACMSD), the enzyme that limits spontaneous cyclization of α-amino-β-carboxymuconate-ε-semialdehyde in the de novo NAD+ synthesis pathway, controls cellular NAD+ levels via an evolutionarily conserved mechanism in Caenorhabditis elegans and mouse. Genetic and pharmacological inhibition of ACMSD boosts de novo NAD+ synthesis and sirtuin 1 activity, ultimately enhancing mitochondrial function. We also characterize two potent and selective inhibitors of ACMSD. Because expression of ACMSD is largely restricted to kidney and liver, these inhibitors may have therapeutic potential for protection of these tissues from injury. In summary, we identify ACMSD as a key modulator of cellular NAD+ levels, sirtuin activity and mitochondrial homeostasis in kidney and liver.}, }
@article {pmid30347487, year = {2019}, author = {Ligas, J and Pineau, E and Bock, R and Huynen, MA and Meyer, EH}, title = {The assembly pathway of complex I in Arabidopsis thaliana.}, journal = {The Plant journal : for cell and molecular biology}, volume = {97}, number = {3}, pages = {447-459}, doi = {10.1111/tpj.14133}, pmid = {30347487}, issn = {1365-313X}, support = {//Centre National pour la Recherche Scientifique/ ; //Max Planck Society/ ; PIRG256398//Marie Curie International Reintegration Grant/ ; }, abstract = {All present-day mitochondria originate from a single endosymbiotic event that gave rise to the last eukaryotic common ancestor more than a billion years ago. However, to date, many aspects of mitochondrial evolution have remained unresolved. Comparative genomics and proteomics have revealed a complex evolutionary origin for many mitochondrial components. To understand the evolution of the respiratory chain, we have examined both the components and the mechanisms of the assembly pathway of complex I. Complex I represents the first enzyme in the respiratory chain, and complex I deficiencies have dramatic consequences in both animals and plants. The complex is located in the mitochondrial inner membrane and possesses two arms: one embedded in the inner membrane and one protruding in the matrix. Here, we describe the assembly pathway of complex I in the model plant Arabidopsis thaliana. Using a proteomics approach called complexome profiling, we have resolved the different steps in the assembly process in plants. We propose a model for the stepwise assembly of complex I, including every subunit. We then compare this pathway with the corresponding pathway in humans and find that complex I assembly in plants follows a different, and likely ancestral, pathway compared with the one in humans. We show that the main evolutionary changes in complex I structure and assembly in humans occurred at the level of the membrane arm, whereas the matrix arm remained rather conserved.}, }
@article {pmid30346990, year = {2018}, author = {Costa-Martins, AG and Lima, L and Alves, JMP and Serrano, MG and Buck, GA and Camargo, EP and Teixeira, MMG}, title = {Genome-wide identification of evolutionarily conserved Small Heat-Shock and eight other proteins bearing α-crystallin domain-like in kinetoplastid protists.}, journal = {PloS one}, volume = {13}, number = {10}, pages = {e0206012}, pmid = {30346990}, issn = {1932-6203}, mesh = {Amino Acid Sequence ; Cilia/metabolism ; *Conserved Sequence ; Cytoskeleton/metabolism ; *Evolution, Molecular ; *Genome ; Heat-Shock Proteins, Small/*chemistry/*genetics ; Mitochondria/metabolism ; Mitochondrial Proteins/metabolism ; Phylogeny ; Prokaryotic Cells/metabolism ; Protein Domains ; Synteny/genetics ; Trypanosomatina/*genetics ; alpha-Crystallins/*chemistry ; }, abstract = {Small Heat-Shock Proteins (sHSPs) and other proteins bearing alpha-crystallin domains (ACD) participate in defense against heat and oxidative stress and play important roles in cell cycle, cytoskeleton dynamics, and immunological and pathological mechanisms in eukaryotes. However, little is known about these proteins in early-diverging lineages of protists such as the kinetoplastids. Here, ACD-like proteins (ACDp) were investigated in genomes of 61 species of 12 kinetoplastid genera, including Trypanosoma spp. (23 species of mammals, reptiles and frogs), Leishmania spp. (mammals and lizards), trypanosomatids of insects, Phytomonas spp. of plants, and bodonids. Comparison of ACDps based on domain architecture, predicted tertiary structure, phylogeny and genome organization reveals a kinetoplastid evolutionarily conserved repertoire, which diversified prior to trypanosomatid adaptation to parasitic life. We identified 9 ACDp orthologs classified in 8 families of TryACD: four previously recognized (HSP20, Tryp23A, Tryp23B and ATOM69), and four characterized for the first time in kinetoplastids (TryACDP, TrySGT1, TryDYX1C1 and TryNudC). A single copy of each ortholog was identified in each genome alongside TryNudC1/TrypNudC2 homologs and, overall, ACDPs were under strong selection pressures at main phylogenetic lineages. Transcripts of all ACDPs were identified across the life stages of T. cruzi, T. brucei and Leishmania spp., but proteomic profiles suggested that most ACDPs may be species- and stage-regulated. Our findings establish the basis for functional studies, and provided evolutionary and structural support for an underestimated repertoire of ACDps in the kinetoplastids.}, }
@article {pmid30343708, year = {2018}, author = {Tanaka, A and Leung, PSC and Gershwin, ME}, title = {Evolution of our understanding of PBC.}, journal = {Best practice &amp; research. Clinical gastroenterology}, volume = {34-35}, number = {}, pages = {3-9}, doi = {10.1016/j.bpg.2018.05.008}, pmid = {30343708}, issn = {1532-1916}, mesh = {Animals ; Autoantibodies/blood ; Autoantigens/immunology ; Epitopes ; Humans ; Liver Cirrhosis, Biliary/*immunology/*pathology ; Mitochondria/immunology ; }, abstract = {The discovery of mitochondrial autoantigens recognized by antimitochondrial antibodies (AMAs) in 1987 marked the dawn of a new era in primary biliary cholangitis (PBC) research. Since then, there has been substantial progress in our understanding of PBC partly bestowed by the development of innovative technologies in molecular biology, immunology, and genetics. Here, we review this evolutionary progress in understanding PBC. We now recognize that the epitopes of AMAs, CD4+, and CD8+ T cells are all mapped to the same region of the inner lipoyl domain of pyruvate dehydrogenase complex E2 subunit (PDC-E2), and that intrahepatic biliary epithelial cells (BECs) are exclusively targeted in PBC. BECs express PDC-E2 on apotopes in an immunologically intact form during apoptosis, but not other epithelial cells, which could explain the tissue specificity of PBC. In addition, genetic factors, environmental triggers, and epigenetic modifications play crucial roles in the development of PBC. Intact lipoylated PDC-E2, presumably after modification with xenobiotics such as 2-octynamide or 2-nonyamide that are abundantly present in the environment, is endocytosed by antigen-presenting cells and are presented to CD4+ or CD8+ T cells. An immune complex consisting of PDC-E2 and anti-PDC-E2 autoantibodies cross-present autoantigens in a more efficient manner. Finally, an adenylate uridine-rich element (ARE) Del -/- mouse model has been established, which presents a disease modeling human PBC, including female dominance as one of its most important features, and can be used to dissect the immunopathology of PBC. Expanding our knowledge of the pathology from a very early stage of the disease will provide the key to cure PBC.}, }
@article {pmid30341492, year = {2019}, author = {Arakawa, T and Ue, S and Sano, C and Matsunaga, M and Kagami, H and Yoshida, Y and Kuroda, Y and Taguchi, K and Kitazaki, K and Kubo, T}, title = {Identification and characterization of a semi-dominant restorer-of-fertility 1 allele in sugar beet (Beta vulgaris).}, journal = {TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik}, volume = {132}, number = {1}, pages = {227-240}, doi = {10.1007/s00122-018-3211-6}, pmid = {30341492}, issn = {1432-2242}, support = {18K05564//Japan Society for the Promotion of Science/ ; 16J01146//Japan Society for the Promotion of Science/ ; Research program on development of innovative technology//Bio-oriented Technology Research Advancement Institution/ ; Grant Number 30001A//Bio-oriented Technology Research Advancement Institution/ ; }, abstract = {KEY MESSAGE: The sugar beet Rf1 locus has a number of molecular variants. We found that one of the molecular variants is a weak allele of a previously identified allele. Male sterility (MS) caused by nuclear-mitochondrial interaction is called cytoplasmic male sterility (CMS) in which MS-inducing mitochondria are suppressed by a nuclear gene, restorer-of-fertility. Rf and rf are the suppressing and non-suppressing alleles, respectively. This dichotomic view, however, seems somewhat unsatisfactory to explain the recently discovered molecular diversity of Rf loci. In the present study, we first identified sugar beet line NK-305 as a new source of Rf1. Our crossing experiment revealed that NK-305 Rf1 is likely a semi-dominant allele that restores partial fertility when heterozygous but full fertility when homozygous, whereas Rf1 from another sugar beet line appeared to be a dominant allele. Proper degeneration of anther tapetum is a prerequisite for pollen development; thus, we compared tapetal degeneration in the NK-305 Rf1 heterozygote and the homozygote. Degeneration occurred in both genotypes but to a lesser extent in the heterozygote, suggesting an association between NK-305 Rf1 dose and incompleteness of tapetal degeneration leading to partial fertility. Our protein analyses revealed a quantitative correlation between NK-305 Rf1 dose and a reduction in the accumulation of a 250 kDa mitochondrial protein complex consisting of a CMS-specific mitochondrial protein encoded by MS-inducing mitochondria. The abundance of Rf1 transcripts correlated with NK-305 Rf1 dose. The molecular organization of NK-305 Rf1 suggested that this allele evolved through intergenic recombination. We propose that the sugar beet Rf1 locus has a series of multiple alleles that differ in their ability to restore fertility and are reflective of the complexity of Rf evolution.}, }
@article {pmid30333973, year = {2018}, author = {Lou, E and Zhai, E and Sarkari, A and Desir, S and Wong, P and Iizuka, Y and Yang, J and Subramanian, S and McCarthy, J and Bazzaro, M and Steer, CJ}, title = {Cellular and Molecular Networking Within the Ecosystem of Cancer Cell Communication via Tunneling Nanotubes.}, journal = {Frontiers in cell and developmental biology}, volume = {6}, number = {}, pages = {95}, pmid = {30333973}, issn = {2296-634X}, abstract = {Intercellular communication is vital to the ecosystem of cancer cell organization and invasion. Identification of key cellular cargo and their varied modes of transport are important considerations in understanding the basic mechanisms of cancer cell growth. Gap junctions, exosomes, and apoptotic bodies play key roles as physical modalities in mediating intercellular transport. Tunneling nanotubes (TNTs)-narrow actin-based cytoplasmic extensions-are unique structures that facilitate direct, long distance cell-to-cell transport of cargo, including microRNAs, mitochondria, and a variety of other sub cellular components. The transport of cargo via TNTs occurs between malignant and stromal cells and can lead to changes in gene regulation that propagate the cancer phenotype. More notably, the transfer of these varied molecules almost invariably plays a critical role in the communication between cancer cells themselves in an effort to resist death by chemotherapy and promote the growth and metastases of the primary oncogenic cell. The more traditional definition of &quot;Systems Biology&quot; is the computational and mathematical modeling of complex biological systems. The concept, however, is now used more widely in biology for a variety of contexts, including interdisciplinary fields of study that focus on complex interactions within biological systems and how these interactions give rise to the function and behavior of such systems. In fact, it is imperative to understand and reconstruct components in their native context rather than examining them separately. The long-term objective of evaluating cancer ecosystems in their proper context is to better diagnose, classify, and more accurately predict the outcome of cancer treatment. Communication is essential for the advancement and evolution of the tumor ecosystem. This interplay results in cancer progression. As key mediators of intercellular communication within the tumor ecosystem, TNTs are the central topic of this article.}, }
@article {pmid30316921, year = {2019}, author = {Gao, XM and Mu, DL and Hou, CC and Zhu, JQ and Jin, S and Wang, CL}, title = {Expression and putative functions of KIFC1 for nuclear reshaping and midpiece formation during spermiogenesis of Phascolosoma esculenta.}, journal = {Gene}, volume = {683}, number = {}, pages = {169-183}, doi = {10.1016/j.gene.2018.10.021}, pmid = {30316921}, issn = {1879-0038}, mesh = {Animals ; Binding Sites ; Cell Nucleus/metabolism ; Gene Expression Regulation ; Kinesin/chemistry/*genetics/*metabolism ; Male ; Microtubules/metabolism ; Models, Molecular ; Phylogeny ; Polychaeta/genetics/*physiology ; Protein Conformation ; Protein Domains ; Protein Transport ; *Spermatogenesis ; }, abstract = {Kinesin-14 KIFC1 plays an important role in vesicular transport, microtubule organization, and spermiogenesis. In this study, we first investigated the microtubule distribution and expression pattern of KIFC1 during spermiogenesis of P. esculenta. Microtubules are abundant during spermiogenesis of P. esculenta and may be related to the generation and maintenance of pseudopodia-like cytoplasmic protrusions and nuclear reshaping. The Pe-KIFC1 protein is conserved with a motor domain where microtubule and ATP binding sites are predicted, a coiled-coil domain and a divergent tail domain. The Pe-kifc1 gene was extensively expressed and showed the highest expression in coelomic fluid where spermiogenesis occurs. We further observed the expression of kifc1 mRNA and protein and found that Pe-KIFC1 protein primarily co-localized with microtubules during spermiogenesis, indicating that KIFC1 might play several roles during this process via its cargo transport and/or microtubule organization function. In addition, co-localization of mitochondria and KIFC1 was also detected during spermiogenesis, which were located in the midpiece in mature sperm, suggesting that mitochondria might be a cargo of Pe-KIFC1 that participates in the intracellular distribution of mitochondria and formation of the midpiece. Based on our detailed observations of the dynamic distribution of microtubules, KIFC1, and mitochondria during spermiogenesis and the conserved function of KIFC1 in cargo transport and microtubule organization, functional models of Pe-KIFC1 during spermiogenesis are proposed, including the participation of KIFC1 in nuclear reshaping and midpiece formation.}, }
@article {pmid30313490, year = {2018}, author = {Katoh, TK and Zhang, G and Zhou, CJ and Gao, JJ}, title = {Taxonomy of the Hirtodrosophila melanderi species group (Diptera: Drosophilidae), with descriptions of four new species from southwestern China.}, journal = {Zootaxa}, volume = {4422}, number = {3}, pages = {345-365}, doi = {10.11646/zootaxa.4422.3.2}, pmid = {30313490}, issn = {1175-5334}, mesh = {Animals ; China ; *Diptera ; *Drosophilidae ; Mitochondria ; Phylogeny ; Tibet ; }, abstract = {The Hirtodrosophila melanderi species group contains nine known species recorded from either the Old or the New World. All these species were thought to be strict fungivorous drosophilids. In the present study, we give supplementary descriptions for three of these known species, all recorded from Yunnan, southwestern China, H. furcapenis, H. furcapenisoides, and H. longifurcapenis, by examining respective type specimen(s). We then describe four new species of the same group, H. seticlasper Katoh Gao, sp. nov., H. spinicerca Katoh Gao, sp. nov., H. serratifurcapenis Katoh Gao, sp. nov., and H. truncifurca Katoh Gao, sp. nov., all discovered recently from high altitudes (ca. 3,500 to 3,800 m a.s.l.) in Tibet (Xizang), southwestern China. The delimitation of these new species is firstly performed in light of morphology and further with the aid of DNA sequences of the mitochondrial COI (cytochrome c oxydase, subunits I) gene. In addition, a key to all the species of the species group is provided.}, }
@article {pmid30311911, year = {2018}, author = {Fischer, J and Müller, SY and Netzker, T and Jäger, N and Gacek-Matthews, A and Scherlach, K and Stroe, MC and García-Altares, M and Pezzini, F and Schoeler, H and Reichelt, M and Gershenzon, J and Krespach, MK and Shelest, E and Schroeckh, V and Valiante, V and Heinzel, T and Hertweck, C and Strauss, J and Brakhage, AA}, title = {Chromatin mapping identifies BasR, a key regulator of bacteria-triggered production of fungal secondary metabolites.}, journal = {eLife}, volume = {7}, number = {}, pages = {}, pmid = {30311911}, issn = {2050-084X}, support = {SFB-F3703//Austrian Science Fund FWF/Austria ; }, mesh = {Acetylation ; Aspergillus nidulans/genetics/*metabolism ; Chromatin/*metabolism ; Fungal Proteins/genetics/*metabolism ; Gene Expression Regulation, Fungal ; Gene Ontology ; Genome, Fungal ; Histidine/metabolism ; Histones/metabolism ; Lysine/metabolism ; Mitochondria/metabolism ; Multigene Family ; Nitrogen/metabolism ; Phylogeny ; *Secondary Metabolism ; Signal Transduction ; Streptomyces/*metabolism ; Transcription Factors/metabolism ; }, abstract = {The eukaryotic epigenetic machinery can be modified by bacteria to reprogram the response of eukaryotes during their interaction with microorganisms. We discovered that the bacterium Streptomyces rapamycinicus triggered increased chromatin acetylation and thus activation of the silent secondary metabolism ors gene cluster in the fungus Aspergillus nidulans. Using this model, we aim understanding mechanisms of microbial communication based on bacteria-triggered chromatin modification. Using genome-wide ChIP-seq analysis of acetylated histone H3, we uncovered the unique chromatin landscape in A. nidulans upon co-cultivation with S. rapamycinicus and relate changes in the acetylation to that in the fungal transcriptome. Differentially acetylated histones were detected in genes involved in secondary metabolism, in amino acid and nitrogen metabolism, in signaling, and encoding transcription factors. Further molecular analyses identified the Myb-like transcription factor BasR as the regulatory node for transduction of the bacterial signal in the fungus and show its function is conserved in other Aspergillus species.}, }
@article {pmid30309500, year = {2018}, author = {Miquel, J and Poonlaphdecha, S and Ribas, A}, title = {Spermatological characteristics of the family Glypthelminthidae (Digenea, Plagiorchioidea) inferred from the ultrastructural study of Glypthelmins staffordi Tubangui, 1928.}, journal = {Tissue &amp; cell}, volume = {54}, number = {}, pages = {114-119}, doi = {10.1016/j.tice.2018.08.013}, pmid = {30309500}, issn = {1532-3072}, mesh = {Animals ; Male ; Phylogeny ; Spermatozoa/*ultrastructure ; Trematoda/*classification/*ultrastructure ; }, abstract = {The present study describes the ultrastructural organization of the mature spermatozoon of the digenean Glypthelmins staffordi (Glypthelminthidae) by means of transmission electron microscopy. Live digeneans were collected from the Chinese edible frog (Hoplobatrachus rugulosus) in Udon Thani Province (Thailand). The ultrastructural study reveals that the mature spermatozoon of G. staffordi is a filiform cell, which is tapered at both extremities. It exhibits the Bakhoum et al.'s type IV of spermatozoon of digeneans characterized by the 9+'1' axonemes of trepaxonematan Platyhelminthes, the presence of the association &quot;external ornamentation-cortical microtubules&quot;, the external ornamentation located in the posterior part of the anterior region, the arrangement of parallel cortical microtubules in two bundles and with its maximum number located in the anterior part of the sperm cell, and the presence of two mitochondria. Other characteristics are the presence of spine-like bodies, a posterior extremity containing only the nucleus, and the presence of a large amount of glycogen granules. Results of the present study are particularly compared with the existing data in other families of the Plagiorchioidea, namely the Brachycoeliidae, the Haematoloechidae, the Omphalometridae and the Plagiorchiidae.}, }
@article {pmid30308027, year = {2018}, author = {Perdices, A and Ozeren, CS and Erkakan, F and Freyhof, J}, title = {Diversity of spined loaches from Asia Minor in a phylogenetic context (Teleostei: Cobitidae).}, journal = {PloS one}, volume = {13}, number = {10}, pages = {e0205678}, pmid = {30308027}, issn = {1932-6203}, mesh = {Animals ; Cypriniformes/*genetics ; DNA, Mitochondrial/genetics ; Genetic Variation/genetics ; Homeodomain Proteins/genetics ; Mitochondria/genetics ; Phylogeny ; Turkey ; }, abstract = {Accurate determination of species diversity in areas of high endemicity, particularly those lacking comprehensive systematic knowledge, represents a challenge for both taxonomists and conservationists. This need is particularly evident in areas greatly affected by anthropogenic disturbances such as the Eastern Mediterranean and its freshwater environments. To improve our knowledge of Eastern Mediterranean freshwater fishes, we phylogenetically studied Western Palearctic Cobitis species, focusing on those found in Turkey. Overall, our results provide a robust framework to assess the number of species of Cobitis. Phylogenetic reconstructions based on mitochondrial (cyt b) and nuclear (RAG1) sequences show seven major clades (Clades 1-7) grouping all Western Palearctic Cobitis species, except C. melanoleuca. In general, each major clade comprises Cobitis species that inhabit geographically close areas and have similar secondary sexual characters. Multiple divergent lineages were identified in our analyses, some of which were highly divergent such as the ones inhabiting Turkish freshwaters. Moreover, in some analyses, several of the identified lineages were incongruent with a priori defined species. Furthermore, our analyses identified eight potentially new candidate species, six that had been suggested in previous studies and two that are reported here for the first time. Our results reveal Turkey as the area with the greatest diversity of spined loaches in the Mediterranean.}, }
@article {pmid30304578, year = {2018}, author = {Burger, G and Valach, M}, title = {Perfection of eccentricity: Mitochondrial genomes of diplonemids.}, journal = {IUBMB life}, volume = {70}, number = {12}, pages = {1197-1206}, doi = {10.1002/iub.1927}, pmid = {30304578}, issn = {1521-6551}, support = {MOP-79309//Canadian Institutes of Health Research/Canada ; GBMF-4983//Gordon and Betty Moore Foundation/ ; RGPIN-2014-05286//NSERC/ ; }, abstract = {Mitochondria are the sandbox of evolution as exemplified most particularly by the diplonemids, a group of marine microeukaryotes. These protists are uniquely characterized by their highly multipartite mitochondrial genome and systematically fragmented genes whose pieces are spread out over several dozens of chromosomes. The type species Diplonema papillatum was the first member of this group in which the expression of fragmented mitochondrial genes was investigated experimentally. We now know that gene expression involves separate transcription of gene pieces (modules), RNA editing of module transcripts, and module joining to mature mRNAs and rRNAs. The mechanism of cognate module recognition and ligation is distinct from known intron splicing and remains to be uncovered. Here, we review the current status of research on mitochondrial genome architecture, as well as gene complement, structure, and expression modes in diplonemids. Further, we discuss the potential molecular mechanisms of posttranscriptional processing, and finally reflect on the evolutionary trajectories and trends of mtDNA evolution as seen in this protist group. © 2018 IUBMB Life, 70(12):1197-1206, 2018.}, }
@article {pmid30304531, year = {2018}, author = {Urantówka, AD and Kroczak, A and Silva, T and Padrón, RZ and Gallardo, NF and Blanch, J and Blanch, B and Mackiewicz, P}, title = {New Insight into Parrots' Mitogenomes Indicates That Their Ancestor Contained a Duplicated Region.}, journal = {Molecular biology and evolution}, volume = {35}, number = {12}, pages = {2989-3009}, pmid = {30304531}, issn = {1537-1719}, abstract = {Mitochondrial genomes of vertebrates are generally thought to evolve under strong selection for size reduction and gene order conservation. Therefore, a growing number of mitogenomes with duplicated regions changes our view on the genome evolution. Among Aves, order Psittaciformes (parrots) is especially noteworthy because of its large morphological, ecological, and taxonomical diversity, which offers an opportunity to study genome evolution in various aspects. Former analyses showed that tandem duplications comprising the control region with adjacent genes are restricted to several lineages in which the duplication occurred independently. However, using an appropriate polymerase chain reaction strategy, we demonstrate that early diverged parrot groups contain mitogenomes with the duplicated region. These findings together with mapping duplication data from other mitogenomes onto parrot phylogeny indicate that the duplication was an ancestral state for Psittaciformes. The state was inherited by main parrot groups and was lost several times in some lineages. The duplicated regions were subjected to concerted evolution with a frequency higher than the rate of speciation. The duplicated control regions may provide a selective advantage due to a more efficient initiation of replication or transcription and a larger number of replicating genomes per organelle, which may lead to a more effective energy production by mitochondria. The mitogenomic duplications were associated with phenotypic features and parrots with the duplicated region can live longer, show larger body mass as well as predispositions to a more active flight. The results have wider implications on the presence of duplications and their evolution in mitogenomes of other avian groups.}, }
@article {pmid30300424, year = {2018}, author = {Kobayashi, G and Araya, JF}, title = {Southernmost records of Escarpia spicata and Lamellibrachia barhami (Annelida: Siboglinidae) confirmed with DNA obtained from dried tubes collected from undiscovered reducing environments in northern Chile.}, journal = {PloS one}, volume = {13}, number = {10}, pages = {e0204959}, pmid = {30300424}, issn = {1932-6203}, mesh = {Animals ; Annelida/classification/*genetics/microbiology ; Bacteria/genetics/isolation &amp; purification ; Chile ; DNA/*chemistry/isolation &amp; purification/metabolism ; Electron Transport Complex IV/classification/genetics ; Hemoglobins/classification/genetics ; Mitochondria/genetics ; Phylogeny ; Protein Subunits/classification/genetics ; RNA, Ribosomal, 16S/chemistry/isolation &amp; purification/metabolism ; Sequence Analysis, DNA ; Symbiosis ; }, abstract = {Deep-sea fishing bycatch enables collection of samples of rare species that are not easily accessible, for research purposes. However, these specimens are often degraded, losing diagnostic morphological characteristics. Several tubes of vestimentiferans, conspicuous annelids endemic to chemosynthetic environments, were obtained from a single batch of deep-sea fishing bycatch at depths of around 1,500 m off Huasco, northern Chile, as part of an ongoing study examining bycatch species. DNA sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene and an intron region within the hemoglobin subunit B2 (hbB2i) were successfully determined using vestimentiferans' dried-up tubes and their degraded inner tissue. Molecular phylogenetic analyses based on DNA sequence identified the samples as Escarpia spicata Jones, 1985, and Lamellibrachia barhami Webb, 1969. These are the southernmost records, vastly extending the geographical ranges of both species from Santa Catalina Island, California to northern Chile for E. spicata (over 8,000 km), and from Vancouver Island Margin to northern Chile for L. barhami (over 10,000 km). We also determined a 16S rRNA sequence of symbiotic bacteria of L. barhami. The sequence of the bacteria is the same as that of E. laminata, Lamellibrachia sp. 1, and Lamellibrachia sp.2 known from the Gulf of Mexico. The present study provides sound evidence forthe presence of reducing environments along the continental margin of northern Chile.}, }
@article {pmid30289547, year = {2019}, author = {Hsu, YW and Juan, CT and Wang, CM and Jauh, GY}, title = {Mitochondrial Heat Shock Protein 60s Interact with What's This Factor 9 to Regulate RNA Splicing of ccmFC and rpl2.}, journal = {Plant &amp; cell physiology}, volume = {60}, number = {1}, pages = {116-125}, doi = {10.1093/pcp/pcy199}, pmid = {30289547}, issn = {1471-9053}, mesh = {Amino Acid Sequence ; Arabidopsis/growth &amp; development ; Arabidopsis Proteins/*metabolism ; Base Sequence ; Chaperonin 60/chemistry/*metabolism ; Introns/*genetics ; Mitochondria/*metabolism ; Mitochondrial Membranes/metabolism ; Mitochondrial Proteins/metabolism ; Mutation/genetics ; Peptides/chemistry/metabolism ; Phenotype ; Protein Binding ; RNA Splicing/*genetics ; RNA-Binding Proteins/*metabolism ; }, abstract = {Mitochondrial intron splicing is a plant-specific feature that was acquired during the co-evolution of eukaryotic host cells and a-proteobacteria. The elimination of these introns is facilitated by mitochondrial-targeted proteins encoded by its host, nucleus. What's this factor 9 (WTF9), a nuclear-encoded plant organelle RNA recognition (PORR) protein, is involved in the splicing of the mitochondrial group II introns rpl2 and ccmFC. Disruption of WTF9 causes developmental defects associated with the loss of Cyt c and Cyt c1 in Arabidopsis. In the present study, using a co-immunoprecipitation assay, we found that HSP60s interacted with WTF9, which was further confirmed by a pull-down assay. HSP60s are molecular chaperones that assist with protein folding in both eukaryotic and prokaryotic cells. However, accumulating evidence suggests that HSP60s also participate in other biological functions such as RNA metabolism and RNA protection. In this study, we found that consistently with their interaction with WTF9, HSP60s interacted with 48 nucleotides of the ccmFC intron. In mutant studies, the double mutant hsp60-3a1hsp60-3b1 exhibited a small stature phenotype and reduced splicing efficiency for rpl2 and ccmFC. These observations were similar to those in wtf9 mutants and suggest that HSP60s are involved in the RNA splicing of rpl2 and ccmFC introns in mitochondria. Our findings suggest that HSP60s participate in mitochondrial RNA splicing through their RNA-binding ability.}, }
@article {pmid30286121, year = {2018}, author = {Ashrafzadeh, MR and Djan, M and Szendrei, L and Paulauskas, A and Scandura, M and Bagi, Z and Ilie, DE and Kerdikoshvili, N and Marek, P and Soós, N and Kusza, S}, title = {Large-scale mitochondrial DNA analysis reveals new light on the phylogeography of Central and Eastern-European Brown hare (Lepus europaeus Pallas, 1778).}, journal = {PloS one}, volume = {13}, number = {10}, pages = {e0204653}, pmid = {30286121}, issn = {1932-6203}, mesh = {Animals ; Cytochromes b/genetics ; DNA, Mitochondrial/*genetics ; Europe ; Haplotypes/genetics ; Hares/*genetics ; Hybridization, Genetic/genetics ; Mitochondria/*genetics ; Phylogeny ; Phylogeography/methods ; RNA, Transfer/genetics ; Sequence Analysis, DNA/methods ; }, abstract = {European brown hare, Lepus europaeus, from Central and Eastern European countries (Hungary, Poland, Serbia, Lithuania, Romania, Georgia and Italy) were sampled, and phylogenetic analyses were carried out on two datasets: 1.) 137 sequences (358 bp) of control region mtDNA; and 2.) 105 sequences of a concatenated fragment (916 bp), including the cytochrome b, tRNA-Thr, tRNA-Pro and control region mitochondrial DNA. Our sequences were aligned with additional brown hare sequences from GenBank. A total of 52 and 51 haplotypes were detected within the two datasets, respectively, and assigned to two previously described major lineages: Anatolian/Middle Eastern (AME) and European (EUR). Furthermore, the European lineage was divided into two subclades including South Eastern European (SEE) and Central European (CE). Sympatric distribution of the lineages of the brown hare in South-Eastern and Eastern Europe revealed contact zones there. BAPS analysis assigned sequences from L. europaeus to five genetic clusters, whereas CE individuals were assigned to only one cluster, and AME and SEE sequences were each assigned to two clusters. Our findings uncover numerous novel haplotypes of Anatolian/Middle Eastern brown hare outside their main range, as evidence for the combined influence of Late Pleistocene climatic fluctuations and anthropogenic activities in shaping the phylogeographic structure of the species. Our results support the hypothesis of a postglacial brown hare expansion from Anatolia and the Balkan Peninsula to Central and Eastern Europe, and suggest some slight introgression of individual haplotypes from L. timidus to L. europaeus.}, }
@article {pmid30285603, year = {2018}, author = {Chen, G and Zou, Y and Hu, J and Ding, Y}, title = {Genome-wide analysis of the rice PPR gene family and their expression profiles under different stress treatments.}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {720}, pmid = {30285603}, issn = {1471-2164}, support = {31471464//National Nature Science Foundation of China/ ; 2013CB126900//&quot;973&quot; Program of China/ ; }, mesh = {Chromosomes, Plant/genetics ; Droughts ; *Gene Expression Profiling ; Genome, Plant/genetics ; *Genomics ; Intracellular Space/metabolism ; MicroRNAs/genetics ; Oryza/drug effects/*genetics/metabolism/*physiology ; Phylogeny ; Plant Proteins/*genetics/metabolism ; Protein Transport ; Salts/pharmacology ; Stress, Physiological/drug effects/*genetics ; Synteny ; }, abstract = {BACKGROUND: Pentatricopeptide-repeat proteins (PPRs) are characterized by tandem arrays of a degenerate 35-amino-acid (PPR motifs), which can bind RNA strands and participate in post-transcription. PPR proteins family is one of the largest families in land plants and play important roles in organelle RNA metabolism and plant development. However, the functions of PPR genes involved in biotic and abiotic stresses of rice (Oryza sativa L.) remain largely unknown.<br><br>RESULTS: In the present study, a comprehensive genome-wide analysis of PPR genes was performed. A total of 491 PPR genes were found in the rice genome, of which 246 PPR genes belong to the P subfamily, and 245 genes belong to the PLS subfamily. Gene structure analysis showed that most PPR genes lack intron. Chromosomal location analysis indicated that PPR genes were widely distributed in all 12 rice chromosomes. Phylogenetic relationship analysis revealed the distinct difference between the P and PLS subfamilies. Many PPR proteins are predicted to target chloroplasts or mitochondria, and a PPR protein (LOC_Os10g34310) was verified to localize in mitochondria. Furthermore, three PPR genes (LOC_Os03g17634,LOC_Os07g40820,LOC_Os04g51350) were verified as corresponding miRNA targets. The expression pattern analysis showed that many PPR genes could be induced under biotic and abiotic stresses. Finally, seven PPR genes were confirmed with their expression patterns under salinity or drought stress.<br><br>CONCLUSIONS: We found 491 PPR genes in the rice genome, and our genes structure analysis and syntenic analysis indicated that PPR genes might be derived from amplification by retro-transposition. The expression pattern present here suggested that PPR proteins have crucial roles in response to different abiotic stresses in rice. Taken together, our study provides a comprehensive analysis of the PPR gene family and will facilitate further studies on their roles in rice growth and development.}, }
@article {pmid30281911, year = {2018}, author = {van Esveld, SL and Huynen, MA}, title = {Does mitochondrial DNA evolution in metazoa drive the origin of new mitochondrial proteins?.}, journal = {IUBMB life}, volume = {70}, number = {12}, pages = {1240-1250}, doi = {10.1002/iub.1940}, pmid = {30281911}, issn = {1521-6551}, support = {//Radboud Institute for Molecular Life Sciences/ ; R0002792//Radboudumc/ ; }, abstract = {Most eukaryotic cells contain mitochondria with a genome that evolved from their α-proteobacterial ancestor. In the course of eukaryotic evolution, the mitochondrial genome underwent a dramatic reduction in size, caused by the loss and translocation of genes. This required adjustments in mitochondrial gene expression mechanisms and resulted in a complex collaborative system of mitochondrially encoded transfer RNAs and ribosomal RNAs with nuclear encoded proteins to express the mitochondrial encoded oxidative phosphorylation (OXPHOS) proteins. In this review, we examine mitochondrial gene expression from an evolutionary point of view: to what extent can we correlate changes in the mitochondrial genome in the evolutionary lineage leading to human with the origin of new nuclear encoded proteins. We dated the evolutionary origin of mitochondrial proteins that interact with mitochondrial DNA or its RNA and/or protein products in a systematic manner and compared them with documented changes in the mitochondrial DNA. We find anecdotal but accumulating evidence that metazoan RNA-interacting proteins arose in conjunction with changes of the mitochondrial DNA. We find no substantial evidence for such compensatory evolution in new OXPHOS proteins, which appear to be constrained by the ability to form supercomplexes. © 2018 IUBMB Life, 70(12):1240-1250, 2018.}, }
@article {pmid30281880, year = {2018}, author = {Harborne, SPD and Kunji, ERS}, title = {Calcium-regulated mitochondrial ATP-Mg/Pi carriers evolved from a fusion of an EF-hand regulatory domain with a mitochondrial ADP/ATP carrier-like domain.}, journal = {IUBMB life}, volume = {70}, number = {12}, pages = {1222-1232}, pmid = {30281880}, issn = {1521-6551}, support = {MC_UU_00015/1//Medical Research Council/United Kingdom ; }, abstract = {The mitochondrial ATP-Mg/Pi carrier is responsible for the calcium-dependent regulation of adenosine nucleotide concentrations in the mitochondrial matrix, which allows mitochondria to respond to changing energy requirements of the cell. The carrier is expressed in mitochondria of fungi, plants and animals and belongs to the family of mitochondrial carriers. The carrier is unusual as it consists of three separate domains: (i) an N-terminal regulatory domain with four calcium-binding EF-hands similar to calmodulin, (ii) a loop domain containing an amphipathic α-helix and (iii) a mitochondrial carrier domain related to the mitochondrial ADP/ATP carrier. This striking example of three domains coming together from different origins to provide new functions represents an interesting quirk of evolution. In this review, we outline how the carrier was identified and how its physiological role was established with a focus on human isoforms. We exploit the sequence and structural information of the domains to explore the similarities and differences to their closest counterparts; mitochondrial ADP/ATP carriers and proteins with four EF-hands. We discuss how their combined function has led to a mechanism for calcium-regulated transport of adenosine nucleotides. Finally, we compare the ATP-Mg/Pi carrier with the mitochondrial aspartate/glutamate carrier, the only other mitochondrial carrier regulated by calcium, and we will argue that they have arisen by convergent rather than divergent evolution. © 2018 The Authors. IUBMB Life published by Wiley Periodicals, Inc. on behalf of International Union of Biochemistry and Molecular Biology, 70(12):1222-1232, 2018.}, }
@article {pmid30280695, year = {2018}, author = {Önder, Z and İnci, A and Yıldırım, A and Çiloğlu, A and Düzlü, Ö}, title = {Molecular Characterization of Myiasis-Causing Moth Flies (Diptera: Psychodidae).}, journal = {Turkiye parazitolojii dergisi}, volume = {42}, number = {3}, pages = {223-228}, doi = {10.5152/tpd.2018.5943}, pmid = {30280695}, issn = {2146-3077}, mesh = {Animals ; Base Sequence ; DNA, Mitochondrial/chemistry ; Mitochondria/genetics ; Myiasis/*parasitology ; Phylogeny ; Psychodidae/classification/*genetics ; Sequence Alignment ; Turkey ; }, abstract = {OBJECTIVE: The aim of this study is to examine the molecular characterization of moth flies (Diptera: Psychodidae) based on their mitochondrial DNA sequences and determine the vectorial potential and damage caused by moth flies in future researches.<br><br>METHODS: A total of 240 adult moth flies were collected from toilet, bathroom, and basement walls of houses from different locations of the Kayseri region between May 2016 and April 2017. The polymerase chain reaction (PCR) analyses were performed using primer pairs, specificaly targeting the mitochondrial cytochrome oxidase c subunit I (mt-COI) gene of adult flies.<br><br>RESULTS: In total, five isolates were gel purified and sequenced for molecular characterization and phylogenetic analyses. Two species, namely Telmatoscopus albipunctatus (ERU-Telmatos3 and ERU-Telmatos6) and Psychodidae sp. (ERU-Psycho1,4,5), were successfully identified with the sequence alignment of isolates. According to the phylogenetic analysis, it was determined that the ERU-Telmatos3 and ERU-Telmatos6 isolates are clustered in the haplogroup A, while the ERU-Psycho1,4,5 isolate was clustered within the haplogroup B. The ERU-Psycho1 isolate was characterized as a new haplotype within the haplogroup B.<br><br>CONCLUSION: This study represents the first molecular characterization and phylogenetic status of moth flies in Turkey. The obtained findings should be the first step in the future investigation based on detecting the transmission of bacterial pathogens by moth flies.}, }
@article {pmid30265295, year = {2018}, author = {Pereira, J and Lupas, AN}, title = {The Origin of Mitochondria-Specific Outer Membrane β-Barrels from an Ancestral Bacterial Fragment.}, journal = {Genome biology and evolution}, volume = {10}, number = {10}, pages = {2759-2765}, pmid = {30265295}, issn = {1759-6653}, mesh = {Animals ; *Evolution, Molecular ; Mitochondrial Membranes ; Mitochondrial Proteins/*genetics ; }, abstract = {Outer membrane β-barrels (OMBBs) are toroidal arrays of antiparallel β-strands that span the outer membrane of Gram-negative bacteria and eukaryotic organelles. Although homologous, most families of bacterial OMBBs evolved through the independent amplification of an ancestral ββ-hairpin. In mitochondria, one family (SAM50) has a clear bacterial ancestry; the origin of the other family, consisting of 19-stranded OMBBs found only in mitochondria (MOMBBs), is substantially unclear. In a large-scale comparison of mitochondrial and bacterial OMBBs, we find evidence that the common ancestor of all MOMBBs emerged by the amplification of a double ββ-hairpin of bacterial origin, probably at the time of the Last Eukaryotic Common Ancestor. Thus, MOMBBs are indeed descended from bacterial OMBBs, but their fold formed independently in the proto-mitochondria, possibly in response to the need for a general-purpose polypeptide importer. This occurred by a process of amplification, despite the final fold having a prime number of strands.}, }
@article {pmid30265292, year = {2018}, author = {Pyrihová, E and Motycková, A and Voleman, L and Wandyszewska, N and Fišer, R and Seydlová, G and Roger, A and Kolísko, M and Doležal, P}, title = {A Single Tim Translocase in the Mitosomes of Giardia intestinalis Illustrates Convergence of Protein Import Machines in Anaerobic Eukaryotes.}, journal = {Genome biology and evolution}, volume = {10}, number = {10}, pages = {2813-2822}, pmid = {30265292}, issn = {1759-6653}, support = {MOP-142349//CIHR/Canada ; }, mesh = {Amino Acid Sequence ; Anaerobiosis ; *Evolution, Molecular ; Giardia lamblia/*enzymology ; Mitochondria/*enzymology ; Mitochondrial Membrane Transport Proteins/*metabolism ; }, abstract = {Mitochondria have evolved diverse forms across eukaryotic diversity in adaptation to anoxia. Mitosomes are the simplest and the least well-studied type of anaerobic mitochondria. Transport of proteins via TIM complexes, composed of three proteins of the Tim17 protein family (Tim17/22/23), is one of the key unifying aspects of mitochondria and mitochondria-derived organelles. However, multiple experimental and bioinformatic attempts have so far failed to identify the nature of TIM in mitosomes of the anaerobic metamonad protist, Giardia intestinalis, one of the few experimental models for mitosome biology. Here, we present the identification of a single G. intestinalis Tim17 protein (GiTim17), made possible only by the implementation of a metamonad-specific hidden Markov model. While very divergent in primary sequence and in predicted membrane topology, experimental data suggest that GiTim17 is an inner membrane mitosomal protein, forming a disulphide-linked dimer. We suggest that the peculiar GiTim17 sequence reflects adaptation to the unusual, detergent resistant, inner mitosomal membrane. Specific pull-down experiments indicate interaction of GiTim17 with mitosomal Tim44, the tethering component of the import motor complex. Analysis of TIM complexes across eukaryote diversity suggests that a &quot;single Tim&quot; translocase is a convergent adaptation of mitosomes in anaerobic protists, with Tim22 and Tim17 (but not Tim23), providing the protein backbone.}, }
@article {pmid30258733, year = {2018}, author = {Huang, Y and Zheng, S and Mei, X and Yu, B and Sun, B and Li, B and Wei, J and Chen, J and Li, T and Pan, G and Zhou, Z and Li, C}, title = {A secretory hexokinase plays an active role in the proliferation of Nosema bombycis.}, journal = {PeerJ}, volume = {6}, number = {}, pages = {e5658}, pmid = {30258733}, issn = {2167-8359}, abstract = {The microsporidian Nosema bombycis is an obligate intracellular parasite of Bombyx mori, that lost its intact tricarboxylic acid cycle and mitochondria during evolution but retained its intact glycolysis pathway. N. bombycis hexokinase (NbHK) is not only a rate-limiting enzyme of glycolysis but also a secretory protein. Indirect immunofluorescence assays and recombinant HK overexpressed in BmN cells showed that NbHK localized in the nucleus and cytoplasm of host cell during the meront stage. When N. bombycis matured, NbHK tended to concentrate at the nuclei of host cells. Furthermore, the transcriptional profile of NbHK implied it functioned during N. bombycis' proliferation stages. A knock-down of NbHK effectively suppressed the proliferation of N. bombycis indicating that NbHK is an important protein for parasite to control its host.}, }
@article {pmid30256727, year = {2019}, author = {McClelland, GB and Scott, GR}, title = {Evolved Mechanisms of Aerobic Performance and Hypoxia Resistance in High-Altitude Natives.}, journal = {Annual review of physiology}, volume = {81}, number = {}, pages = {561-583}, doi = {10.1146/annurev-physiol-021317-121527}, pmid = {30256727}, issn = {1545-1585}, abstract = {Comparative physiology studies of high-altitude species provide an exceptional opportunity to understand naturally evolved mechanisms of hypoxia resistance. Aerobic capacity (VO2max) is a critical performance trait under positive selection in some high-altitude taxa, and several high-altitude natives have evolved to resist the depressive effects of hypoxia on VO2max. This is associated with enhanced flux capacity through the O2 transport cascade and attenuation of the maladaptive responses to chronic hypoxia that can impair O2 transport. Some highlanders exhibit elevated rates of carbohydrate oxidation during exercise, taking advantage of its high ATP yield per mole of O2. Certain highland native animals have also evolved more oxidative muscles and can sustain high rates of lipid oxidation to support thermogenesis. The underlying mechanisms include regulatory adjustments of metabolic pathways and to gene expression networks. Therefore, the evolution of hypoxia resistance in high-altitude natives involves integrated functional changes in the pathways for O2 and substrate delivery and utilization by mitochondria.}, }
@article {pmid30246391, year = {2019}, author = {Shibata, D}, title = {Somatic cell evolution: how to improve with age.}, journal = {The Journal of pathology}, volume = {247}, number = {1}, pages = {3-5}, doi = {10.1002/path.5173}, pmid = {30246391}, issn = {1096-9896}, support = {U54 CA217376/CA/NCI NIH HHS/United States ; P30 CA014089/CA/NCI NIH HHS/United States ; P30CA014089/NH/NIH HHS/United States ; CA196569/NH/NIH HHS/United States ; P01 CA196569/CA/NCI NIH HHS/United States ; U54CA217376/NH/NIH HHS/United States ; }, abstract = {A recent article published in this journal illuminates a rare example of somatic evolution where cells improve rather than deteriorate with age. In mitotic intestinal crypts, stem cells with higher levels of a deleterious heteroplasmic germline mitochondrial mutation are purged through time, leading to crypts without the mutation. Similar somatic mitochondrial mutations are not purged from crypts, indicating that special conditions are needed to improve with age. Copyright © 2018 Pathological Society of Great Britain and Ireland. Published by John Wiley &amp; Sons, Ltd.}, }
@article {pmid30239827, year = {2019}, author = {Shang, Y and Ren, L and Chen, W and Zha, L and Cai, J and Dong, J and Guo, Y}, title = {Comparative Mitogenomic Analysis of Forensically Important Sarcophagid Flies (Diptera: Sarcophagidae) and Implications of Species Identification.}, journal = {Journal of medical entomology}, volume = {56}, number = {2}, pages = {392-407}, doi = {10.1093/jme/tjy162}, pmid = {30239827}, issn = {1938-2928}, abstract = {The flesh flies (Diptera: Sarcophagidae) are significant in forensic investigations. The mitochondrial genome (mitogeome) has been widely used as genetic markers for phylogenetic analysis and species identification. To further understand the mitogenome-level features in Sarcophagidae, the complete mitogenome of Sarcophaga formosensis (Kirneret Lopes, 1961) (Diptera: Sarcophagidae) and Sarcophaga misera (Walker, 1849) (Diptera: Sarcophagidae) was firstly sequenced, annotated, and compared with other 13 Sarcophagidae species. The result indicated that the gene arrangement, gene content, base composition, and codon usage were conserved in the ancestral arthropod. Evolutionary rate of the mitogenome fragments revealed that the nonsynonymous and synonymous substitution rates (Ka and Ks) ratio was less than 1.00, indicating these variable sites under strong purifying selection. Almost all transfer RNA genes (tRNAs) have typical clover-leaf structures within these sarcophagid mitogenomes, except tRNA-Ser (AGN) is lack of the dihydrouridine arm. This comparative mitogenomic analysis sheds light on the architecture and evolution of mitogenomes in the Sarcophagidae. Phylogenetic analyses containing the interspecific distances from different regions in these species provided us new insights into the application of these effective genetic markers for species identification of flesh flies.}, }
@article {pmid30239783, year = {2018}, author = {Hood, WR and Austad, SN and Bize, P and Jimenez, AG and Montooth, KL and Schulte, PM and Scott, GR and Sokolova, I and Treberg, JR and Salin, K}, title = {The Mitochondrial Contribution to Animal Performance, Adaptation, and Life-History Variation.}, journal = {Integrative and comparative biology}, volume = {58}, number = {3}, pages = {480-485}, doi = {10.1093/icb/icy089}, pmid = {30239783}, issn = {1557-7023}, mesh = {*Acclimatization ; Animals ; *Energy Metabolism ; *Life History Traits ; Mitochondria/*physiology ; }, abstract = {Animals display tremendous variation in their rates of growth, reproductive output, and longevity. While the physiological and molecular mechanisms that underlie this variation remain poorly understood, the performance of the mitochondrion has emerged as a key player. Mitochondria not only impact the performance of eukaryotes via their capacity to produce ATP, but they also play a role in producing heat and reactive oxygen species and function as a major signaling hub for the cell. The papers included in this special issue emerged from a symposium titled &quot;Inside the Black Box: The Mitochondrial Basis of Life-history Variation and Animal Performance.&quot; Based on studies of diverse animal taxa, three distinct themes emerged from these papers. (1) When linking mitochondrial function to components of fitness, it is crucial that mitochondrial assays are performed in conditions as close as the intracellular conditions experienced by the mitochondria in vivo. (2) Functional plasticity allows mitochondria to retain their performance, as well as that of their host, over a range of exogenous conditions, and selection on mitochondrial and nuclear-derived proteins can optimize the match between the environment and the bioenergetic capacity of the mitochondrion. Finally, (3) studies of wild and wild-derived animals suggest that mitochondria play a central role in animal performance and life history strategy. Taken as a whole, we hope that these papers will foster discussion and inspire new hypotheses and innovations that will further our understanding of the mitochondrial processes that underlie variation in life history traits and animal performance.}, }
@article {pmid30213880, year = {2018}, author = {Ramrath, DJF and Niemann, M and Leibundgut, M and Bieri, P and Prange, C and Horn, EK and Leitner, A and Boehringer, D and Schneider, A and Ban, N}, title = {Evolutionary shift toward protein-based architecture in trypanosomal mitochondrial ribosomes.}, journal = {Science (New York, N.Y.)}, volume = {362}, number = {6413}, pages = {}, doi = {10.1126/science.aau7735}, pmid = {30213880}, issn = {1095-9203}, mesh = {*Evolution, Molecular ; Mitochondrial Ribosomes/*chemistry/ultrastructure ; Models, Molecular ; Protozoan Proteins/*chemistry/ultrastructure ; RNA, Ribosomal/chemistry/ultrastructure ; Ribosomal Proteins/*chemistry/ultrastructure ; Trypanosoma brucei brucei/*ultrastructure ; }, abstract = {Ribosomal RNA (rRNA) plays key functional and architectural roles in ribosomes. Using electron microscopy, we determined the atomic structure of a highly divergent ribosome found in mitochondria of Trypanosoma brucei, a unicellular parasite that causes sleeping sickness in humans. The trypanosomal mitoribosome features the smallest rRNAs and contains more proteins than all known ribosomes. The structure shows how the proteins have taken over the role of architectural scaffold from the rRNA: They form an autonomous outer shell that surrounds the entire particle and stabilizes and positions the functionally important regions of the rRNA. Our results also reveal the &quot;minimal&quot; set of conserved rRNA and protein components shared by all ribosomes that help us define the most essential functional elements.}, }
@article {pmid30211573, year = {2018}, author = {Geary, DC}, title = {Efficiency of mitochondrial functioning as the fundamental biological mechanism of general intelligence (g).}, journal = {Psychological review}, volume = {125}, number = {6}, pages = {1028-1050}, doi = {10.1037/rev0000124}, pmid = {30211573}, issn = {1939-1471}, mesh = {Aging/*physiology ; *Biological Evolution ; *Health Status ; Humans ; Intelligence/genetics/*physiology ; Mitochondria/*physiology ; }, abstract = {General intelligence or g is one of the most thoroughly studied concepts in the behavioral sciences. Measures of intelligence are predictive of a wide range of educational, occupational, and life outcomes, including creative productivity and are systematically related to physical health and successful aging. The nexus of relations suggests 1 or several fundamental biological mechanisms underlie g, health, and aging, among other outcomes. Cell-damaging oxidative stress has been proposed as 1 of many potential mechanisms, but the proposal is underdeveloped and does not capture other important mitochondrial functions. I flesh out this proposal and argue that the overall efficiency of mitochondrial functioning is a core component of g; the most fundamental biological mechanism common to all brain and cognitive processes and that contributes to the relations among intelligence, health, and aging. The proposal integrates research on intelligence with models of the centrality of mitochondria to brain development and functioning, neurological diseases, and health more generally. Moreover, the combination of the maternal inheritance of mitochondrial DNA (mtDNA), the evolution of compensatory nuclear DNA, and the inability of evolutionary processes to purge deleterious mtDNA in males may contribute to the sex difference in variability in intelligence and in other cognitive domains. The proposal unifies many now disparate literatures and generates testable predictions for future studies. (PsycINFO Database Record (c) 2018 APA, all rights reserved).}, }
@article {pmid30209549, year = {2018}, author = {Sandor, S and Zhang, Y and Xu, J}, title = {Fungal mitochondrial genomes and genetic polymorphisms.}, journal = {Applied microbiology and biotechnology}, volume = {102}, number = {22}, pages = {9433-9448}, doi = {10.1007/s00253-018-9350-5}, pmid = {30209549}, issn = {1432-0614}, support = {531998//Natural Sciences and Engineering Research Council of Canada/ ; }, abstract = {Mitochondria are the powerhouses of eukaryotic cells, responsible for ATP generation and playing a role in a diversity of cellular and organismal functions. Different from the majority of other intracellular membrane structures, mitochondria contain their own genetic materials that are capable of independent replication and inheritance. In this mini-review, we provide brief summaries of fungal mitochondrial genome structure, size, gene content, inheritance, and genetic variation. We pay special attention to the relative genetic polymorphisms of the mitochondrial vs nuclear genomes at the population level within individual fungal species. Among the 20 species/groups of species reviewed here, there is a range of variation among genes and species in the relative nuclear and mitochondrial genetic polymorphisms. Interestingly, most (15/20) showed a greater genetic diversity for nuclear genes and genomes than for mitochondrial genes and genomes, with the remaining five showing similar or slower nuclear genome genetic variations. This fungal pattern is different from the dominant pattern in animals, but more similar to that in plants. At present, the mechanisms for the variations among fungal species and the overall low level of mitochondrial sequence polymorphisms are not known. The increasing availability of population genomic data should help us reveal the potential genetic and ecological factors responsible for the observed variations.}, }
@article {pmid30208839, year = {2018}, author = {Bono, JM and Pigage, HK and Wettstein, PJ and Prosser, SA and Pigage, JC}, title = {Genome-wide markers reveal a complex evolutionary history involving divergence and introgression in the Abert's squirrel (Sciurus aberti) species group.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {139}, pmid = {30208839}, issn = {1471-2148}, mesh = {Animals ; *Biological Evolution ; Cytochromes b/genetics ; DNA, Mitochondrial/genetics ; Genetic Markers ; *Genetic Variation ; *Genome ; Geography ; Haplotypes/genetics ; Likelihood Functions ; Mitochondria/genetics ; Phylogeography ; Polymorphism, Single Nucleotide/genetics ; Principal Component Analysis ; Sciuridae/*genetics ; }, abstract = {BACKGROUND: Genetic introgression between divergent lineages is now considered more common than previously appreciated, with potentially important consequences for adaptation and speciation. Introgression is often asymmetric between populations and patterns can vary for different types of loci (nuclear vs. organellar), complicating phylogeographic reconstruction. The taxonomy of the ecologically specialized Abert's squirrel species group has been controversial, and previous studies based on mitochondrial data have not fully resolved the evolutionary relationships among populations. Moreover, while these studies identified potential areas of secondary contact between divergent lineages, the possibility for introgression has not been tested.<br><br>RESULTS: We used RAD-seq to unravel the complex evolutionary history of the Abert's squirrel species group. Although some of our findings reinforce inferences based on mitochondrial data, we also find significant areas of discordance. Discordant signals generally arise from previously undetected introgression between divergent populations that differentially affected variation at mitochondrial and nuclear loci. Most notably, our results support earlier claims (disputed by mitochondrial data) that S. aberti kaibabensis, found only on the north rim of the Grand Canyon, is highly divergent from other populations. However, we also detected introgression of S. aberti kaibabensis DNA into other S. aberti populations, which likely accounts for the previously inferred close genetic relationship between this population and those south of the Grand Canyon.<br><br>CONCLUSIONS: Overall, the evolutionary history of Abert's squirrels appears to be shaped largely by divergence during periods of habitat isolation. However, we also found evidence for interbreeding during periods of secondary contact resulting in introgression, with variable effects on mitochondrial and nuclear markers. Our results support the emerging view that populations often diversify under scenarios involving both divergence in isolation and gene flow during secondary contact, and highlight the value of genome-wide datasets for resolving such complex evolutionary histories.}, }
@article {pmid30208106, year = {2018}, author = {Viret, A and Tsaparis, D and Tsigenopoulos, CS and Berrebi, P and Sabatini, A and Arculeo, M and Fassatoui, C and Magoulas, A and Marengo, M and Morales-Nin, B and Caill-Milly, N and Durieux, EDH}, title = {Absence of spatial genetic structure in common dentex (Dentex dentex Linnaeus, 1758) in the Mediterranean Sea as evidenced by nuclear and mitochondrial molecular markers.}, journal = {PloS one}, volume = {13}, number = {9}, pages = {e0203866}, pmid = {30208106}, issn = {1932-6203}, mesh = {Alleles ; Animals ; Atlantic Ocean ; Bayes Theorem ; Cell Nucleus/*genetics ; DNA, Mitochondrial/analysis/genetics ; Gene Flow ; Gene Frequency/genetics ; Genetic Variation ; Genetics, Population/methods ; Mediterranean Sea ; Microsatellite Repeats/genetics ; Mitochondria/*genetics ; Perciformes/*genetics ; Phylogeny ; }, abstract = {The common dentex, Dentex dentex, is a fish species which inhabits marine environments in the Mediterranean and Northeast Atlantic regions. This is an important species from an ecological, economic and conservation perspective, however critical information on its population genetic structure is lacking. Most samples were obtained from the Mediterranean Sea (17 sites) with an emphasis around Corsica (5 sites), plus one Atlantic Ocean site. This provided an opportunity to examine genetic structuring at local and broader scales to provide science based data for the management of fishing stocks in the region. Two mitochondrial regions were examined (D-loop and COI) along with eight microsatellite loci. The COI data was combined with publicly available sequences and demonstrated past misidentification of common dentex. All markers indicated the absence of population genetic structure from the Bay of Biscay to the eastern Mediterranean Sea. Bayesian approaches, as well as the statistical tests performed on the allelic frequencies from microsatellite loci, indicated low differentiation between samples; there was only a slight (p = 0.05) indication of isolation by distance. Common dentex is a marine fish species with a unique panmictic population in the Mediterranean and likely in the Atlantic Ocean as well.}, }
@article {pmid30206380, year = {2018}, author = {Jebb, D and Foley, NM and Whelan, CV and Touzalin, F and Puechmaille, SJ and Teeling, EC}, title = {Population level mitogenomics of long-lived bats reveals dynamic heteroplasmy and challenges the Free Radical Theory of Ageing.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {13634}, pmid = {30206380}, issn = {2045-2322}, support = {ERC-2012-StG311000//EC | European Research Council (ERC)/ ; }, abstract = {Bats are the only mammals capable of true, powered flight, which drives an extremely high metabolic rate. The &quot;Free Radical Theory of Ageing&quot; (FTRA) posits that a high metabolic rate causes mitochondrial heteroplasmy and the progressive ageing phenotype. Contrary to this, bats are the longest-lived order of mammals given their small size and high metabolic rate. To investigate if bats exhibit increased mitochondrial heteroplasmy with age, we performed targeted, deep sequencing of mitogenomes and measured point heteroplasmy in wild, long lived Myotis myotis. Blood was sampled from 195 individuals, aged between <1 and at 6+ years old, and whole mitochondria deep-sequenced, with a subset sampled over multiple years. The majority of heteroplasmies were at a low frequency and were transitions. Oxidative mutations were present in only a small number of individuals, suggesting local oxidative stress events. Cohort data showed no significant increase in heteroplasmy with age, while longitudinal data from recaptured individuals showed heteroplasmy is dynamic, and does not increase uniformly over time. We show that bats do not suffer from the predicted, inevitable increase in heteroplasmy as posited by the FRTA, instead heteroplasmy was found to be dynamic, questioning its presumed role as a primary driver of ageing.}, }
@article {pmid30204084, year = {2018}, author = {Seidi, A and Muellner-Wong, LS and Rajendran, E and Tjhin, ET and Dagley, LF and Aw, VY and Faou, P and Webb, AI and Tonkin, CJ and van Dooren, GG}, title = {Elucidating the mitochondrial proteome of Toxoplasma gondii reveals the presence of a divergent cytochrome c oxidase.}, journal = {eLife}, volume = {7}, number = {}, pages = {}, pmid = {30204084}, issn = {2050-084X}, support = {DP110103144//Australian Research Council/International ; }, mesh = {Animals ; Biotinylation ; Computational Biology ; Electron Transport Complex IV/*metabolism ; Gene Knockdown Techniques ; Mitochondria/*metabolism ; Mitochondrial Membranes/metabolism ; Mitochondrial Proteins/metabolism ; Oxygen Consumption ; Parasites/growth &amp; development/metabolism ; Phenotype ; Phylogeny ; Proteome/*metabolism ; Proteomics ; Protozoan Proteins/metabolism ; Toxoplasma/growth &amp; development/*metabolism ; }, abstract = {The mitochondrion of apicomplexan parasites is critical for parasite survival, although the full complement of proteins that localize to this organelle has not been defined. Here we undertake two independent approaches to elucidate the mitochondrial proteome of the apicomplexan Toxoplasma gondii. We identify approximately 400 mitochondrial proteins, many of which lack homologs in the animals that these parasites infect, and most of which are important for parasite growth. We demonstrate that one such protein, termed TgApiCox25, is an important component of the parasite cytochrome c oxidase (COX) complex. We identify numerous other apicomplexan-specific components of COX, and conclude that apicomplexan COX, and apicomplexan mitochondria more generally, differ substantially in their protein composition from the hosts they infect. Our study highlights the diversity that exists in mitochondrial proteomes across the eukaryotic domain of life, and provides a foundation for defining unique aspects of mitochondrial biology in an important phylum of parasites.}, }
@article {pmid30201278, year = {2018}, author = {Santos, HJ and Makiuchi, T and Nozaki, T}, title = {Reinventing an Organelle: The Reduced Mitochondrion in Parasitic Protists.}, journal = {Trends in parasitology}, volume = {34}, number = {12}, pages = {1038-1055}, doi = {10.1016/j.pt.2018.08.008}, pmid = {30201278}, issn = {1471-5007}, mesh = {Animals ; Biodiversity ; Biological Evolution ; Eukaryota/classification/cytology/*physiology ; Mitochondria/*physiology ; Parasites/classification/cytology/*physiology ; }, abstract = {Mitochondria originated from the endosymbiotic event commencing from the engulfment of an ancestral α-proteobacterium by the first eukaryotic ancestor. Establishment of niches has led to various adaptations among eukaryotes. In anaerobic parasitic protists, the mitochondria have undergone modifications by combining features shared from the aerobic mitochondria with lineage-specific components and mechanisms; a diversified class of organelles emerged and are generally called mitochondrion-related organelles (MROs). In this review we summarize and discuss the recent advances in the knowledge of MROs from parasitic protists, particularly the themes such as metabolic functions, contribution to parasitism, dynamics, protein targeting, and novel lineage- specific proteins, with emphasis on the diversity among these organelles.}, }
@article {pmid30196672, year = {2018}, author = {Eom, KS and Park, H and Lee, D and Choe, S and Kang, Y and Bia, MM and Lee, SH and Keyyu, J and Fyumagwa, R and Jeon, HK}, title = {Molecular and Morphologic Identification of Spirometra ranarum Found in the Stool of African Lion, Panthera leo in the Serengeti Plain of Tanzania.}, journal = {The Korean journal of parasitology}, volume = {56}, number = {4}, pages = {379-383}, pmid = {30196672}, issn = {1738-0006}, support = {2017R1D1A3B03035976//National Research Foundation of Korea/ ; PRB000720//Parasite Resource Bank of Korea/ ; }, mesh = {Animals ; Cyclooxygenase 1/genetics ; Feces/*parasitology ; Host-Parasite Interactions ; Lions/*parasitology ; Male ; Mitochondria/genetics ; NADH Dehydrogenase/genetics ; Phylogeny ; Spirometra/anatomy &amp; histology/*genetics/*isolation &amp; purification ; Tanzania ; }, abstract = {The present study was performed with morphological and molecular analysis (cox1 and nad1 mitochondrial genes) to identify the proglottids of spirometrid tapeworm found in the stool of an African lion, Panthera leo, in the Serengeti plain of Tanzania. A strand of tapeworm strobila, about 75 cm in length, was obtained in the stool of a male African lion in the Serengeti National Park (34˚ 50' E, 02˚ 30' S), Tanzania, in February 2012. The morphological features of the adult worm examined exhibited 3 uterine coils with a bow tie appearance and adopted a diagonal direction in the second turn. The posterior uterine coils are larger than terminal uterine ball and the feature of uteri are swirling rather than spirally coiling. The sequence difference between the Spirometra species (Tanzania origin) and S. erinaceieuropaei (GenBank no. KJ599680) was 9.4% while those of S. decipiens (GenBank no. KJ599679) differed by 2.1% in the cox1 and nad1 genes. Phylogenetic tree topologies generated using the 2 analytic methods were identical and presented high level of confidence values for the 3 major branches of the 3 Spirometra species in the cox1 gene. The morphological and molecular findings obtained in this study were nearly coincided with those of S. ranarum. Therefore, we can know for the first time that the African lion, Panthera leo, is to the definitive host of this tapeworm.}, }
@article {pmid30195322, year = {2018}, author = {Verechshagina, NA and Konstantinov, YM and Kamenski, PA and Mazunin, IO}, title = {Import of Proteins and Nucleic Acids into Mitochondria.}, journal = {Biochemistry. Biokhimiia}, volume = {83}, number = {6}, pages = {643-661}, doi = {10.1134/S0006297918060032}, pmid = {30195322}, issn = {1608-3040}, mesh = {Biopolymers/metabolism ; Eukaryota/genetics/*metabolism ; Mitochondria/*genetics ; Mitochondrial Membranes/metabolism ; Mitochondrial Proteins/genetics/*metabolism ; Nucleic Acids/*metabolism ; RNA, Transfer/metabolism ; }, abstract = {Many mitochondrial genes have been transferred to the nucleus in course of evolution. The products of expression of these genes, being still necessary for organelle function, are imported there from the cytosol. Molecular mechanisms of protein import are studied much deeper than those of nucleic acids. The latter, it seems to us, retards the development of mitochondrial genome editing technologies. In this review, we describe mechanisms of DNA, RNA, and protein import into mitochondria of different eukaryotes. The description is given for the natural processes, as well as for artificial targeting of macromolecules into mitochondria for therapy. Also, we discuss different approaches to introduce changes into the mitochondrial DNA sequence.}, }
@article {pmid30179526, year = {2018}, author = {Haenel, GJ and Del Gaizo Moore, V}, title = {Functional Divergence of Mitochondria and Coevolution of Genomes: Cool Mitochondria in Hot Lizards.}, journal = {Physiological and biochemical zoology : PBZ}, volume = {91}, number = {5}, pages = {1068-1081}, doi = {10.1086/699918}, pmid = {30179526}, issn = {1537-5293}, mesh = {Animals ; *Biological Coevolution ; Body Temperature ; Genome ; Hot Temperature ; Lizards/*genetics/*physiology ; Mitochondria/genetics/*physiology ; }, abstract = {Mitochondria play a key role in the ecology and evolution of species through their influence on aerobic metabolism. Mitochondrial DNA (mtDNA) and nuclear genomes must interact for optimal functioning of oxidative phosphorylation to produce ATP, and breakdown of coadaptation components from each may have important evolutionary consequences for hybridization. Introgression of mitochondria in natural populations through hybridization with unidirectional backcrossing allows the testing of coadaptation of mitochondria to different nuclear backgrounds. We compared the function of mitochondria isolated from two species of Urosaurus lizards and hybrid populations. Due to past introgression, hybrids contain the nuclear genome of the &quot;hot-adapted&quot; species (U. graciosus) but the mtDNA of the less heat-tolerant species (U. ornatus). It was found that the function of the parental forms of mitochondria had significantly diverged with the hot-adapted species. There was significant genotype × genotype × environment interactions for mitochondrial membrane potential and genotype × genotype interactions for ATP production. Membrane potential decreased less at a higher temperature, while ATP production was higher at both temperatures in introgressed mitochondria. Oxygen consumption was lower in U. graciosus than in U. ornatus parental-type mitochondria, indicating a likely response to living in hotter environments. Respiratory control ratio values, which provide an indication of the functional quality of isolated mitochondria, were lower in introgressed mitochondria than in parental U. ornatus types, indicating a negative impact on biological function in introgressed mitochondria.}, }
@article {pmid30176805, year = {2018}, author = {Matthee, CA and Engelbrecht, A and Matthee, S}, title = {Comparative phylogeography of parasitic Laelaps mites contribute new insights into the specialist-generalist variation hypothesis (SGVH).}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {131}, pmid = {30176805}, issn = {1471-2148}, support = {Incentive Funding//National Research Foundation/International ; }, mesh = {Animals ; Base Sequence ; Cell Nucleus/genetics ; DNA, Mitochondrial/genetics ; Genetic Variation ; Geography ; Haplotypes/genetics ; Host Specificity ; Mites/*classification/genetics ; Mitochondria/genetics ; *Models, Biological ; Murinae/genetics/parasitology ; Parasites/*classification/genetics ; *Phylogeography ; }, abstract = {BACKGROUND: The specialist-generalist variation hypothesis (SGVH) in parasites suggests that, due to patchiness in habitat (host availability), specialist species will show more subdivided population structure when compared to generalist species. In addition, since specialist species are more prone to local stochastic extinction events with their hosts, they will show lower levels of intraspecific genetic diversity when compared to more generalist.<br><br>RESULTS: To test the wider applicability of the SGVH we compared 337 cytochrome oxidase I mitochondrial DNA and 268 nuclear tropomyosin DNA sequenced fragments derived from two co-distributed Laelaps mite species and compared the data to 294 COI mtDNA sequences derived from the respective hosts Rhabdomys dilectus, R. bechuanae, Mastomys coucha and M. natalensis. In support of the SGVH, the generalist L. muricola was characterized by a high mtDNA haplotypic diversity of 0.97 (±0.00) and a low level of population differentiation (mtDNA Fst = 0.56, p < 0.05; nuDNA Fst = 0.33, P < 0.05) while the specialist L. giganteus was overall characterized by a lower haplotypic diversity of 0.77 (±0.03) and comparatively higher levels of population differentiation (mtDNA Fst = 0.87, P < 0.05; nuDNA Fst = 0.48, P < 0.05). When the two specialist L. giganteus lineages, which occur on two different Rhabdomys species, are respectively compared to the generalist parasite, L. muricola, the SGVH is not fully supported. One of the specialist L. giganteus species occurring on R. dilectus shows similar low levels of population differentiation (mtDNA Fst = 0.53, P < 0.05; nuDNA Fst = 0.12, P < 0.05) than that found for the generalist L. muricola. This finding can be correlated to differences in host dispersal: R. bechuanae populations are characterized by a differentiated mtDNA Fst of 0.79 (P < 0.05) while R. dilectus populations are less structured with a mtDNA Fst = 0.18 (P < 0.05).<br><br>CONCLUSIONS: These findings suggest that in ectoparasites, host specificity and the vagility of the host are both important drivers for parasite dispersal. It is proposed that the SGHV hypothesis should also incorporate reference to host dispersal since in our case only the specialist species who occur on less mobile hosts showed more subdivided population structure when compared to generalist species.}, }
@article {pmid30176793, year = {2018}, author = {Yin, M and Wang, X and Ma, X and Gießler, S and Petrusek, A and Griebel, J and Hu, W and Wolinska, J}, title = {Cytonuclear diversity and shared mitochondrial haplotypes among Daphnia galeata populations separated by seven thousand kilometres.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {130}, pmid = {30176793}, issn = {1471-2148}, support = {31670380//National Natural Science Foundation of China/International ; 16ZR1402900//Natural Science Foundation of Shanghai/International ; WO 1587/6-1//German Science Foundation/International ; }, mesh = {Alleles ; Animals ; Bayes Theorem ; Cell Nucleus/*genetics ; China ; DNA/genetics ; DNA, Mitochondrial/genetics ; Daphnia/*genetics ; Europe ; Genes, Mitochondrial ; *Genetic Variation ; Genetics, Population ; Geography ; Haplotypes/*genetics ; Microsatellite Repeats/genetics ; Mitochondria/*genetics ; Phylogeny ; Zooplankton/genetics ; }, abstract = {BACKGROUND: The zooplanktonic cladocerans Daphnia, present in a wide range of water bodies, are an important component of freshwater ecosystems. In contrast to their high dispersal capacity through diapausing eggs carried by waterfowl, Daphnia often exhibit strong population genetic differentiation. Here, to test for common patterns in the population genetic structure of a widespread Holarctic species, D. galeata, we genotyped two sets of populations collected from geographically distant areas: across 13 lakes in Eastern China and 14 lakes in Central Europe. The majority of these populations were genotyped at two types of markers: a mitochondrial gene (for 12S rRNA) and 15 nuclear microsatellite loci.<br><br>RESULTS: Mitochondrial DNA demonstrated relatively shallow divergence within D. galeata, with distinct haplotype compositions in the two study regions but one widely distributed haplotype shared between several of the Chinese as well as European populations. At microsatellite markers, clear separation was observed at both large (between China and Europe) and small (within Europe) geographical scales, as demonstrated by Factorial Correspondence Analyses, Bayesian assignment and a clustering method based on genetic distances. Genetic diversity was comparable between the sets of Chinese and European D. galeata populations for both types of markers. Interestingly, we observed a significant association between genetic distance and geographical distance for D. galeata populations in China but not in Europe.<br><br>CONCLUSIONS: Our results indicate relatively recent spread of D. galeata across wide expanses of the Palaearctic, with one mtDNA lineage of D. galeata successfully establishing over large distances. Despite a clear differentiation of Chinese and European D. galeata at a nuclear level, the pattern of genetic variation is nevertheless similar between both regions. Overall, our findings provide insights into the genetic population structure of a cladoceran species with extremely wide geographical range.}, }
@article {pmid30176236, year = {2019}, author = {Virji, AZ and Thekkiniath, J and Ma, W and Lawres, L and Knight, J and Swei, A and Roch, KL and Mamoun, CB}, title = {Insights into the evolution and drug susceptibility of Babesia duncani from the sequence of its mitochondrial and apicoplast genomes.}, journal = {International journal for parasitology}, volume = {49}, number = {2}, pages = {105-113}, doi = {10.1016/j.ijpara.2018.05.008}, pmid = {30176236}, issn = {1879-0135}, support = {R01 GM110506/GM/NIGMS NIH HHS/United States ; UL1 TR001863/TR/NCATS NIH HHS/United States ; R01 AI123321/AI/NIAID NIH HHS/United States ; R01 AI097218/AI/NIAID NIH HHS/United States ; R43 AI136118/AI/NIAID NIH HHS/United States ; }, abstract = {Babesia microti and Babesia duncani are the main causative agents of human babesiosis in the United States. While significant knowledge about B. microti has been gained over the past few years, nothing is known about B. duncani biology, pathogenesis, mode of transmission or sensitivity to currently recommended therapies. Studies in immunocompetent wild type mice and hamsters have shown that unlike B. microti, infection with B. duncani results in severe pathology and ultimately death. The parasite factors involved in B. duncani virulence remain unknown. Here we report the first known completed sequence and annotation of the apicoplast and mitochondrial genomes of B. duncani. We found that the apicoplast genome of this parasite consists of a 34 kb monocistronic circular molecule encoding functions that are important for apicoplast gene transcription as well as translation and maturation of the organelle's proteins. The mitochondrial genome of B. duncani consists of a 5.9 kb monocistronic linear molecule with two inverted repeats of 48 bp at both ends. Using the conserved cytochrome b (Cytb) and cytochrome c oxidase subunit I (coxI) proteins encoded by the mitochondrial genome, phylogenetic analysis revealed that B. duncani defines a new lineage among apicomplexan parasites distinct from B. microti, Babesia bovis, Theileria spp. and Plasmodium spp. Annotation of the apicoplast and mitochondrial genomes of B. duncani identified targets for development of effective therapies. Our studies set the stage for evaluation of the efficacy of these drugs alone or in combination against B. duncani in culture as well as in animal models.}, }
@article {pmid30172009, year = {2018}, author = {Pavón-Vázquez, CJ and García-Vázquez, UO and Bryson, RW and Feria-Ortiz, M and Manríquez-Morán, NL and de Oca, AN}, title = {Integrative species delimitation in practice: Revealing cryptic lineages within the short-nosed skink Plestiodon brevirostris (Squamata: Scincidae).}, journal = {Molecular phylogenetics and evolution}, volume = {129}, number = {}, pages = {242-257}, doi = {10.1016/j.ympev.2018.08.020}, pmid = {30172009}, issn = {1095-9513}, mesh = {Animals ; Bayes Theorem ; DNA, Mitochondrial/genetics ; Genetic Loci ; Geography ; Lizards/*classification/genetics ; Mexico ; Mitochondria/genetics ; *Phylogeny ; RNA, Ribosomal, 16S/genetics ; Reproducibility of Results ; Species Specificity ; Time Factors ; }, abstract = {Integrative taxonomy has been generally considered as a goal in systematics for more than a decade. Here, we employed environmental, molecular, and morphological data to evaluate the species boundaries within the short-nosed skink Plestiodon brevirostris from south-central Mexico, one member of the morphologically conservative P. brevirostris group. Our molecular dataset includes one mitochondrial and two nuclear loci. The mitochondrial fragment includes the full length of the gene coding for the NADH dehydrogenase subunit 1 protein, a segment of the gene coding for 16S ribosomal RNA, and flanking tRNAs. The nuclear dataset includes fragments of the genes coding for the megakaryoblastic leukemia 1 and RNA fingerprint 35 proteins. We employed phylogenetic reconstruction, analyses of population structure and morphological variation, and species delimitation methods (including the integration of the three kinds of data in a unified probabilistic framework) to evaluate species limits. Our results suggest that P. brevirostris represents four distinct species. The information provided by each kind of data allowed us to discern between alternative explanations for the observed patterns of geographic structure. Two of the newly recognized lineages are poorly differentiated morphologically but apparently differ in environmental preferences and are allopatric. Additionally, one lineage is microendemic and parapatric with respect to another one. Moreover, our phylogenetic analyses suggest that other taxa within the P. brevirostris group may represent species complexes. We discuss our results in the context of integrative species delimitation.}, }
@article {pmid30166340, year = {2018}, author = {Valach, M and Léveillé-Kunst, A and Gray, MW and Burger, G}, title = {Respiratory chain Complex I of unparalleled divergence in diplonemids.}, journal = {The Journal of biological chemistry}, volume = {293}, number = {41}, pages = {16043-16056}, pmid = {30166340}, issn = {1083-351X}, support = {MOP-79309//CIHR/Canada ; }, mesh = {DNA, Mitochondrial/*metabolism ; Electron Transport ; Electron Transport Complex I/*metabolism ; Euglenozoa/*genetics/*metabolism ; Mass Spectrometry ; Mitochondria/metabolism ; Mitochondrial Membranes/metabolism ; Mitochondrial Proteins/metabolism ; NADH Dehydrogenase/metabolism ; Phenylalanine/chemistry ; Phylogeny ; Protons ; RNA Editing ; RNA Splicing ; Ubiquinone/chemistry ; }, abstract = {Mitochondrial genes of Euglenozoa (Kinetoplastida, Diplonemea, and Euglenida) are notorious for being barely recognizable, raising the question of whether such divergent genes actually code for functional proteins. Here we demonstrate the translation and identify the function of five previously unassigned y genes encoded by mitochondrial DNA (mtDNA) of diplonemids. As is the rule in diplonemid mitochondria, y genes are fragmented, with gene pieces transcribed separately and then trans-spliced to form contiguous mRNAs. Further, y transcripts undergo massive RNA editing, including uridine insertions that generate up to 16-residue-long phenylalanine tracts, a feature otherwise absent from conserved mitochondrial proteins. By protein sequence analyses, MS, and enzymatic assays in Diplonema papillatum, we show that these y genes encode the subunits Nad2, -3, -4L, -6, and -9 of the respiratory chain Complex I (CI; NADH:ubiquinone oxidoreductase). The few conserved residues of these proteins are essentially those involved in proton pumping across the inner mitochondrial membrane and in coupling ubiquinone reduction to proton pumping (Nad2, -3, -4L, and -6) and in interactions with subunits containing electron-transporting Fe-S clusters (Nad9). Thus, in diplonemids, 10 CI subunits are mtDNA-encoded. Further, MS of D. papillatum CI allowed identification of 26 conventional and 15 putative diplonemid-specific nucleus-encoded components. Most conventional accessory subunits are well-conserved but unusually long, possibly compensating for the streamlined mtDNA-encoded components and for missing, otherwise widely distributed, conventional subunits. Finally, D. papillatum CI predominantly exists as a supercomplex I:III:IV that is exceptionally stable, making this protist an organism of choice for structural studies.}, }
@article {pmid30165810, year = {2018}, author = {Galen, SC and Nunes, R and Sweet, PR and Perkins, SL}, title = {Integrating coalescent species delimitation with analysis of host specificity reveals extensive cryptic diversity despite minimal mitochondrial divergence in the malaria parasite genus Leucocytozoon.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {128}, pmid = {30165810}, issn = {1471-2148}, support = {1358465//National Science Foundation/International ; }, mesh = {Animals ; Cytochromes b/genetics ; DNA, Mitochondrial/genetics ; Genetic Loci ; *Genetic Variation ; Haemosporida/*genetics ; Haplotypes/genetics ; *Host Specificity ; Malaria/*parasitology ; Mitochondria/*genetics ; Parasites/*genetics ; Phylogeny ; Songbirds/parasitology ; Species Specificity ; }, abstract = {BACKGROUND: Coalescent methods that use multi-locus sequence data are powerful tools for identifying putatively reproductively isolated lineages, though this approach has rarely been used for the study of microbial groups that are likely to harbor many unrecognized species. Among microbial symbionts, integrating genetic species delimitation methods with trait data that could indicate reproductive isolation, such as host specificity data, has rarely been used despite its potential to inform species limits. Here we test the ability of an integrative approach combining genetic and host specificity data to delimit species within the avian malaria parasite genus Leucocytozoon in central Alaska.<br><br>RESULTS: We sequenced seven nuclear loci for 69 Leucocytozoon samples and used multiple species delimitation methods (GMYC and BPP models), tested for differences in host infection patterns among putative species based on 406 individual infections, and characterized parasite morphology. We found that cryptic morphology has masked a highly diverse Leucocytozoon assemblage, with most species delimitation methods recovering support for at least 21 separate species that occur sympatrically and have divergent host infection patterns. Reproductive isolation among putative species appears to have evolved despite low mtDNA divergence, and in one instance two Leucocytozoon cytb haplotypes that differed by a single base pair (~ 0.2% divergence) were supported as separate species. However, there was no consistent association between mtDNA divergence and species limits. Among cytb haplotypes that differed by one to three base pairs we observed idiosyncratic patterns of nuclear and ecological divergence, with cytb haplotype pairs found to be either conspecific, reproductively isolated with no divergence in host specificity, or reproductively isolated with divergent patterns of host specialization.<br><br>CONCLUSION: Integrating multi-locus genetic species delimitation methods and non-traditional ecological data types such as host specificity provide a novel view of the diversity of avian malaria parasites that has been missed previously using morphology and mtDNA barcodes. Species delimitation methods show that Leucocytozoon is highly species-rich in Alaska, and the genus is likely to harbor extraordinary species-level diversity worldwide. Integrating genetic and ecological data will be an important approach for understanding the diversity and evolutionary history of microbial symbionts moving forward.}, }
@article {pmid30160146, year = {2018}, author = {Goh, CJ and Park, D and Kim, H and Sebastiani, F and Hahn, Y}, title = {Novel Divavirus (the family Betaflexiviridae) and Mitovirus (the family Narnaviridae) species identified in basil (Ocimum basilicum).}, journal = {Acta virologica}, volume = {62}, number = {3}, pages = {304-309}, doi = {10.4149/av_2018_224}, pmid = {30160146}, issn = {0001-723X}, mesh = {Flexiviridae/classification/genetics/*isolation &amp; purification/physiology ; Genome, Viral ; Ocimum basilicum/*virology ; Phylogeny ; Plant Diseases/*virology ; RNA Replicase/genetics ; Viral Proteins/genetics ; }, abstract = {Transcriptome data obtained from a plant sample often contain a large number of reads that are derived from associated RNA virus genomes that were co-isolated during RNA preparation. These virus-derived reads can be assembled into a novel plant RNA genome sequence. Here, a basil (Ocimum basilicum) transcriptome dataset was analyzed to identify two new RNA viruses, which were named Ocimum basilicum RNA virus 1 (ObRV1) and Ocimum basilicum RNA virus 2 (ObRV2). A phylogenetic analysis of the ObRV1 RNA-dependent RNA polymerase (RdRp) motif indicated that ObRV1 is a novel species of the genus Divavirus of the family Betaflexiviridae. ObRV1 is the fourth divavirus species to be identified. The ObRV2 RdRp motif showed sequence similarity to viruses of the genus Mitovirus of the family Narnaviridae, which infect fungal mitochondria. Although most of the known mitoviruses do not produce a functional RdRp using the plant mitochondrial genetic code, the ObRV2 encodes a full-length RdRp using both the fungal and plant mitochondrial genetic codes.}, }
@article {pmid30158483, year = {2018}, author = {Kozieł, E and Otulak-Kozieł, K and Bujarski, JJ}, title = {Ultrastructural Analysis of Prune DwarfVirus Intercellular Transport and Pathogenesis.}, journal = {International journal of molecular sciences}, volume = {19}, number = {9}, pages = {}, pmid = {30158483}, issn = {1422-0067}, support = {505-10-011100-Q00190-99//Warsaw Univeristy of Life Sciences WULS-SGGW/ ; }, mesh = {Alfalfa mosaic virus/genetics/*pathogenicity/*ultrastructure ; Biological Transport/genetics/physiology ; Phylogeny ; RNA, Viral ; Viral Proteins/metabolism/ultrastructure ; }, abstract = {Prune dwarf virus (PDV) is an important viral pathogen of plum, sweet cherry, peach, and many herbaceous test plants. Although PDV has been intensively investigated, mainly in the context of phylogenetic relationship of its genes and proteins, many gaps exist in our knowledge about the mechanism of intercellular transport of this virus. The aim of this work was to investigate alterations in cellular organelles and the cell-to-cell transport of PDV in Cucumis sativus cv. Polan at ultrastructural level. To analyze the role of viral proteins in local transport, double-immunogold assays were applied to localize PDV coat protein (CP) and movement protein (MP). We observe structural changes in chloroplasts, mitochondria, and cellular membranes. We prove that PDV is transported as viral particles via MP-generated tubular structures through plasmodesmata. Moreover, the computer-run 3D modeling reveals structural resemblances between MPs of PDV and of Alfalfa mosaic virus (AMV), implying similarities of transport mechanisms for both viruses.}, }
@article {pmid30154842, year = {2018}, author = {Berzabá-Evoli, E and Zazueta, C and Cruz Hernández, JH and Gómez-Crisóstomo, NP and Juárez-Rojop, IE and De la Cruz-Hernández, EN and Martínez-Abundis, E}, title = {Leptin Modifies the Rat Heart Performance Associated with Mitochondrial Dysfunction Independently of Its Prohypertrophic Effects.}, journal = {International journal of endocrinology}, volume = {2018}, number = {}, pages = {6081415}, pmid = {30154842}, issn = {1687-8337}, abstract = {Background: Functional receptors for leptin were described on the surface of cardiomyocytes, and there was a prohypertrophic effect with high concentrations of the cytokine. Therefore, leptin could be a link between obesity and the prevalence of cardiovascular diseases. On the other hand, a deleterious effect of leptin on mitochondrial performance was described, which was also associated with the evolution of cardiac hypertrophy to heart failure. The goal of our study was to analyze the effect of the exposure of rat hearts to a high concentration of leptin on cardiac and mitochondrial function.<br><br>Methods: Rat hearts were perfused continuously with or without 3.1 nM leptin for 1, 2, 3, or 4 hours. Homogenates and mitochondria were prepared by centrifugation and analyzed for cardiac actin, STAT3, and pSTAT3 by Western blotting, as well as for mitochondrial oxidative phosphorylation, membrane potential, swelling, calcium transport, and content of oxidized lipids.<br><br>Results: In our results, leptin induced an increased rate-pressure product as a result of increased heart rate and contraction force, as well oxidative stress. In addition, mitochondrial dysfunction expressed as a loss of membrane potential, decreased ability for calcium transport and retention, faster swelling, and less respiratory control was observed.<br><br>Conclusions: Our results support the role of leptin as a deleterious factor for cardiac function and indicates that mitochondrial dysfunction could be a trigger for cardiac hypertrophy and failure.}, }
@article {pmid30144423, year = {2018}, author = {Pustylnikov, S and Costabile, F and Beghi, S and Facciabene, A}, title = {Targeting mitochondria in cancer: current concepts and immunotherapy approaches.}, journal = {Translational research : the journal of laboratory and clinical medicine}, volume = {202}, number = {}, pages = {35-51}, doi = {10.1016/j.trsl.2018.07.013}, pmid = {30144423}, issn = {1878-1810}, support = {R01 CA206012/CA/NCI NIH HHS/United States ; }, mesh = {Animals ; DNA, Mitochondrial/genetics ; Humans ; *Immunotherapy ; Mitochondria/*metabolism ; Mitochondrial Dynamics ; Neoplasms/*immunology/*therapy ; T-Lymphocytes/metabolism ; }, abstract = {An essential advantage during eukaryotic cell evolution was the acquisition of a network of mitochondria as a source of energy for cell metabolism and contrary to conventional wisdom, functional mitochondria are essential for the cancer cell. Multiple aspects of mitochondrial biology beyond bioenergetics support transformation including mitochondrial biogenesis, fission and fusion dynamics, cell death susceptibility, oxidative stress regulation, metabolism, and signaling. In cancer, the metabolism of cells is reprogrammed for energy generation from oxidative phosphorylation to aerobic glycolysis and impacts cancer mitochondrial function. Furthermore cancer cells can also modulate energy metabolism within the cancer microenvironment including immune cells and induce &quot;metabolic anergy&quot; of antitumor immune response. Classical approaches targeting the mitochondria of cancer cells usually aim at inducing changing energy metabolism or directly affecting functions of mitochondrial antiapoptotic proteins but most of such approaches miss the required specificity of action and carry important side effects. Several types of cancers harbor somatic mitochondrial DNA mutations and specific immune response to mutated mitochondrial proteins has been observed. An attractive alternative way to target the mitochondria in cancer cells is the induction of an adaptive immune response against mutated mitochondrial proteins. Here, we review the cancer cell-intrinsic and cell-extrinsic mechanisms through which mitochondria influence all steps of oncogenesis, with a focus on the therapeutic potential of targeting mitochondrial DNA mutations or Tumor Associated Mitochondria Antigens using the immune system.}, }
@article {pmid30141728, year = {2018}, author = {Boratyński, JS and Szafrańska, PA}, title = {Does Basal Metabolism Set the Limit for Metabolic Downregulation during Torpor?.}, journal = {Physiological and biochemical zoology : PBZ}, volume = {91}, number = {5}, pages = {1057-1067}, doi = {10.1086/699917}, pmid = {30141728}, issn = {1537-5293}, mesh = {Animals ; Basal Metabolism/*physiology ; Body Mass Index ; Down-Regulation ; Mammals/*physiology ; Models, Biological ; Torpor/*physiology ; }, abstract = {The evolution of endothermic thermoregulation is rooted in the processes involving high metabolism, which allows the maintenance of high and stable body temperatures (Tb). In turn, selection for high endothermic metabolism correlates with increased size of metabolically active organs and thus with high basal metabolic rate (BMR). Endothermic animals are characterized by an MR several times that of similar-sized ectotherms. However, many small mammals are temporally heterothermic and are able to temporally decrease Tb and MR by entering daily torpor or hibernation. Both BMR and minimum MR during torpor (TMRmin) likely result from oxidative respiration in mitochondria of the same tissues. It should be expected that these two MRs are positively correlated, suggesting that the evolution of endothermy and higher BMR set the limit for the ability to reduce MR while entering torpor. Using published data for 96 mammal species, we tested the hypothesis that, among heterothermic mammals, the processes leading to the evolution of higher BMR limit the ability to downregulate metabolism during torpor. We found that body mass (mb)-adjusted BMR was positively correlated with mb- and Tb-adjusted TMRmin, in a phylogenetically corrected analysis. Phylogenetic path modeling indicated that the mechanisms underlying the evolutionary increase of BMR in endotherms most likely constrain their ability to reduce MR during torpor. Given that heterothermy is considered an ancestral state in mammals, these results suggest an increase in BMR during the evolution of endothermy in homeothermic animals, which leads to the loss of their ability to enter torpor.}, }
@article {pmid30139961, year = {2018}, author = {Liu, J and Kim, SY and Shin, S and Jung, SH and Yim, SH and Lee, JY and Lee, SH and Chung, YJ}, title = {Overexpression of TFF3 is involved in prostate carcinogenesis via blocking mitochondria-mediated apoptosis.}, journal = {Experimental &amp; molecular medicine}, volume = {50}, number = {8}, pages = {110}, pmid = {30139961}, issn = {2092-6413}, abstract = {The overexpression of trefoil factor family 3 (TFF3) is observed in a variety of cancers, including prostate cancer (PCa), and its potential role in carcinogenesis, such as activating the PI3K/AKT pathway, is suggested. However, its role and its related mechanisms in prostate tumorigenesis remain unknown. To elucidate the role of TFF3 overexpression in PCa, we silenced TFF3 in two PCa cell lines that overexpressed TFF3 and explored the molecular mechanism behind its antiapoptotic role. We also examined TFF3 expression in 108 Korean PCa specimens and 106 normal prostate tissues by immunohistochemistry (IHC) analysis. The mean TFF3 IHC score in the tumor tissues was significantly higher than that in the normal tissues (4.702 vs. 0.311, P = 2.52 × 10-24). TFF3-silenced cells showed suppressed tumor cell growth and migration. TFF3 silencing decreased BCL2 and increased BAX expression. The translocation of BAX to the mitochondria was also confirmed. After TFF3 silencing, the expression of the mitochondrial proapoptotic proteins, cytochrome C and Smac/DIABLO, was elevated, and these proteins were released from the mitochondria to the cytosol. Downstream mediators of mitochondrial apoptosis, including cleaved caspase-3, caspase-9, and PARP, were also elevated. Accordingly, the proportion of apoptotic cells was significantly higher among TFF3-silenced cells. There was no difference in extrinsic apoptosis-related molecules after TFF3 silencing. All the results support that TFF3 silencing induces the downstream signaling pathway of mitochondria-mediated apoptosis. This study provides a better understanding of the mechanism of prostate tumorigenesis, suggesting TFF3 as a potential biomarker and therapeutic target of PCa.}, }
@article {pmid30138782, year = {2018}, author = {Treitli, SC and Kotyk, M and Yubuki, N and Jirounková, E and Vlasáková, J and Smejkalová, P and Šípek, P and Čepička, I and Hampl, V}, title = {Molecular and Morphological Diversity of the Oxymonad Genera Monocercomonoides and Blattamonas gen. nov.}, journal = {Protist}, volume = {169}, number = {5}, pages = {744-783}, doi = {10.1016/j.protis.2018.06.005}, pmid = {30138782}, issn = {1618-0941}, mesh = {Genetic Variation ; Microscopy, Electron ; Oxymonadida/*genetics/*growth &amp; development/ultrastructure ; Phylogeny ; Sequence Analysis, DNA ; }, abstract = {Oxymonads are a group of flagellates living as gut symbionts of insects or vertebrates. They have several unique features, one of them being the absence of mitochondria. Diversity of this group is seriously understudied, which is particularly true for small species from the family Polymastigidae. We isolated 34 strains of oxymonads with Polymastigidae-like morphology from 24 host species and unused cesspits and sequenced the SSU rRNA gene. Our strains formed two clades in the phylogenetic tree with Streblomastix strix branching between them. This topology was also supported by a three-gene phylogenetic analysis. Despite considerable genetic differences between the clades, light and electron microscopy revealed only subtle differences. The larger clade is considered genus Monocercomonoides and the isolates belonging here were classified into three new species (including the first potentially free-living species), two previously described species, and three unclassified lineages. The smaller clade, here described as Blattamonas gen. nov., consists of three newly described species. Concomitantly with the description of Blattamonas, we elevate the Monocercomonoides subgenus Brachymonas to the genus level. Our study shows that, despite their conserved morphology, the molecular diversity of Polymastigidae-like oxymonads is broad and represents a substantial part of the diversity of oxymonads.}, }
@article {pmid30137656, year = {2018}, author = {Kagda, MS and Vu, AL and Ah-Fong, AMV and Judelson, HS}, title = {Phosphagen kinase function in flagellated spores of the oomycete Phytophthora infestans integrates transcriptional regulation, metabolic dynamics and protein retargeting.}, journal = {Molecular microbiology}, volume = {110}, number = {2}, pages = {296-308}, doi = {10.1111/mmi.14108}, pmid = {30137656}, issn = {1365-2958}, abstract = {Flagellated spores play important roles in the infection of plants and animals by many eukaryotic microbes. The oomycete Phytophthora infestans, which causes potato blight, expresses two phosphagen kinases (PKs). These enzymes store energy in taurocyamine, and are hypothesized to resolve spatial and temporal imbalances between rates of ATP creation and use in zoospores. A dimeric PK is found at low levels in vegetative mycelia, but high levels in ungerminated sporangia and zoospores. In contrast, a monomeric PK protein is at similar levels in all tissues, although is transcribed primarily in mycelia. Subcellular localization studies indicate that the monomeric PK is mitochondrial. In contrast, the dimeric PK is cytoplasmic in mycelia and sporangia but is retargeted to flagellar axonemes during zoosporogenesis. This supports a model in which PKs shuttle energy from mitochondria to and through flagella. Metabolite analysis indicates that deployment of the flagellar PK is coordinated with a large increase in taurocyamine, synthesized by sporulation-induced enzymes that were lost during the evolution of zoospore-lacking oomycetes. Thus, PK function is enabled by coordination of the transcriptional, metabolic and protein targeting machinery during the life cycle. Since plants lack PKs, the enzymes may be useful targets for inhibitors of oomycete plant pathogens.}, }
@article {pmid30127539, year = {2018}, author = {Betts, HC and Puttick, MN and Clark, JW and Williams, TA and Donoghue, PCJ and Pisani, D}, title = {Integrated genomic and fossil evidence illuminates life's early evolution and eukaryote origin.}, journal = {Nature ecology &amp; evolution}, volume = {2}, number = {10}, pages = {1556-1562}, pmid = {30127539}, issn = {2397-334X}, support = {BB/N000919/1//Biotechnology and Biological Sciences Research Council/United Kingdom ; }, abstract = {Establishing a unified timescale for the early evolution of Earth and life is challenging and mired in controversy because of the paucity of fossil evidence, the difficulty of interpreting it and dispute over the deepest branching relationships in the tree of life. Surprisingly, it remains perhaps the only episode in the history of life where literal interpretations of the fossil record hold sway, revised with every new discovery and reinterpretation. We derive a timescale of life, combining a reappraisal of the fossil material with new molecular clock analyses. We find the last universal common ancestor of cellular life to have predated the end of late heavy bombardment (>3.9 billion years ago (Ga)). The crown clades of the two primary divisions of life, Eubacteria and Archaebacteria, emerged much later (<3.4 Ga), relegating the oldest fossil evidence for life to their stem lineages. The Great Oxidation Event significantly predates the origin of modern Cyanobacteria, indicating that oxygenic photosynthesis evolved within the cyanobacterial stem lineage. Modern eukaryotes do not constitute a primary lineage of life and emerged late in Earth's history (<1.84 Ga), falsifying the hypothesis that the Great Oxidation Event facilitated their radiation. The symbiotic origin of mitochondria at 2.053-1.21 Ga reflects a late origin of the total-group Alphaproteobacteria to which the free living ancestor of mitochondria belonged.}, }
@article {pmid30121730, year = {2019}, author = {Radzinski, M and Reichmann, D}, title = {Variety is the spice of life: how to explore a redox-dependent heterogeneity in genomically identical cellular populations.}, journal = {Current genetics}, volume = {65}, number = {1}, pages = {301-306}, doi = {10.1007/s00294-018-0878-9}, pmid = {30121730}, issn = {1432-0983}, support = {1765/13//Israel Science Foundation/ ; 1649/16//legacy Heritage Biomedical Science Partnership/ ; CDA00064/2014//Human Frontier Science Program/ ; 2015056//United States - Israel Binational Science Foundation/ ; }, abstract = {Cellular heterogeneity is a widespread phenomenon, existing across organisms and serving a crucial role in evolution and cell survival. Genetically identical cells may as a result present in a variety of forms with different gene and protein expressions, as well as oxidation level. As a result, a wide range of methodologies and techniques for dissecting different types of genetic, proteomic, and phenotypic heterogeneous traits have emerged in recent years in an effort to better understand how diversity exists within a single population and its effects therein. A key area of interest seeks to establish the ways in which cellular heterogeneity and aging processes interact with each other. Here, we discuss recent developments in defining cellular heterogeneity, specifically focusing on redox-dependent heterogeneity, its characterization, quantification, and behavior. We further expand on potential applications of a cell sorting-based methodology for distinguishing between cells harboring different redox statuses. As an example, we use organelle-specific fluorescence protein-based probes to examine the crosstalk between cytosol and mitochondria in a yeast strain lacking glutathione reductase. Together, these may have wide-reaching implications for future research into redox-associated factors, as well as mechanisms of redox-dependent heterogeneity and its influence on organelles and the cell at large.}, }
@article {pmid30114217, year = {2018}, author = {Shi, Y and Liu, Y and Zhang, S and Zou, R and Tang, J and Mu, W and Peng, Y and Dong, S}, title = {Assembly and comparative analysis of the complete mitochondrial genome sequence of Sophora japonica 'JinhuaiJ2'.}, journal = {PloS one}, volume = {13}, number = {8}, pages = {e0202485}, pmid = {30114217}, issn = {1932-6203}, mesh = {Base Composition ; DNA, Mitochondrial/genetics ; DNA, Plant/genetics ; Genes, Plant ; *Genome, Mitochondrial ; Homologous Recombination ; Introns ; Mitochondria/genetics ; Phylogeny ; Plant Proteins/genetics ; RNA, Plant/genetics ; RNA, Ribosomal/genetics ; RNA, Transfer/genetics ; Sequence Analysis, DNA ; Sophora/*genetics ; Whole Genome Sequencing ; }, abstract = {Sophora japonica L. (Faboideae, Leguminosae) is an important traditional Chinese herb with a long history of cultivation. Its flower buds and fruits contain abundant flavonoids, and therefore, the plants are cultivated for the industrial extraction of rutin. Here, we determined the complete nucleotide sequence of the mitochondrial genome of S. japonica 'JinhuaiJ2', the most widely planted variety in Guangxi region of China. The total length of the mtDNA sequence is 484,916 bp, with a GC content of 45.4%. Sophora japonica mtDNA harbors 32 known protein-coding genes, 17 tRNA genes, and three rRNA genes with 17 cis-spliced and five trans-spliced introns disrupting eight protein-coding genes. The gene coding and intron regions, and intergenic spacers account for 7.5%, 5.8% and 86.7% of the genome, respectively. The gene profile of S. japonica mitogenome differs from that of the other Faboideae species by only one or two gene gains or losses. Four of the 17 cis-spliced introns showed distinct length variations in the Faboideae, which could be attributed to the homologous recombination of the short repeats measuring a few bases located precisely at the edges of the putative deletions. This reflects the importance of small repeats in the sequence evolution in Faboideae mitogenomes. Repeated sequences of S. japonica mitogenome are mainly composed of small repeats, with only 20 medium-sized repeats, and one large repeat, adding up to 4% of its mitogenome length. Among the 25 pseudogene fragments detected in the intergenic spacer regions, the two largest ones and their corresponding functional gene copies located in two different sets of medium-sized repeats, point to their origins from homologous recombinations. As we further observed the recombined reads associated with the longest repeats of 2,160 bp with the PacBio long read data set of just 15 × in depth, repeat mediated homologous recombinations may play important role in the mitogenomic evolution of S. japonica. Our study provides insightful knowledge to the genetic background of this important herb species and the mitogenomic evolution in the Faboideae species.}, }
@article {pmid30114187, year = {2018}, author = {Weiss, MC and Preiner, M and Xavier, JC and Zimorski, V and Martin, WF}, title = {The last universal common ancestor between ancient Earth chemistry and the onset of genetics.}, journal = {PLoS genetics}, volume = {14}, number = {8}, pages = {e1007518}, pmid = {30114187}, issn = {1553-7404}, mesh = {Archaea/genetics ; Bacteria/genetics ; Eukaryota/genetics ; *Evolution, Molecular ; Gene Transfer, Horizontal ; Genetic Code ; Genome ; Mitochondria/genetics ; Nucleic Acid Conformation ; Origin of Life ; *Phylogeny ; Prokaryotic Cells ; }, abstract = {All known life forms trace back to a last universal common ancestor (LUCA) that witnessed the onset of Darwinian evolution. One can ask questions about LUCA in various ways, the most common way being to look for traits that are common to all cells, like ribosomes or the genetic code. With the availability of genomes, we can, however, also ask what genes are ancient by virtue of their phylogeny rather than by virtue of being universal. That approach, undertaken recently, leads to a different view of LUCA than we have had in the past, one that fits well with the harsh geochemical setting of early Earth and resembles the biology of prokaryotes that today inhabit the Earth's crust.}, }
@article {pmid30110634, year = {2018}, author = {Vazquez, JM and Sulak, M and Chigurupati, S and Lynch, VJ}, title = {A Zombie LIF Gene in Elephants Is Upregulated by TP53 to Induce Apoptosis in Response to DNA Damage.}, journal = {Cell reports}, volume = {24}, number = {7}, pages = {1765-1776}, doi = {10.1016/j.celrep.2018.07.042}, pmid = {30110634}, issn = {2211-1247}, abstract = {Large-bodied organisms have more cells that can potentially turn cancerous than small-bodied organisms, imposing an increased risk of developing cancer. This expectation predicts a positive correlation between body size and cancer risk; however, there is no correlation between body size and cancer risk across species (&quot;Peto's paradox&quot;). Here, we show that elephants and their extinct relatives (proboscideans) may have resolved Peto's paradox in part through refunctionalizing a leukemia inhibitory factor pseudogene (LIF6) with pro-apoptotic functions. LIF6 is transcriptionally upregulated by TP53 in response to DNA damage and translocates to the mitochondria where it induces apoptosis. Phylogenetic analyses of living and extinct proboscidean LIF6 genes indicates that its TP53 response element evolved coincident with the evolution of large body sizes in the proboscidean stem lineage. These results suggest that refunctionalizing of a pro-apoptotic LIF pseudogene may have been permissive (although not sufficient) for the evolution of large body sizes in proboscideans.}, }
@article {pmid30109028, year = {2018}, author = {Wideman, JG and Balacco, DL and Fieblinger, T and Richards, TA}, title = {PDZD8 is not the 'functional ortholog' of Mmm1, it is a paralog.}, journal = {F1000Research}, volume = {7}, number = {}, pages = {1088}, pmid = {30109028}, issn = {2046-1402}, abstract = {Authors of a recent paper demonstrate that, like ERMES (ER-mitochondria encounter structure) in fungal cells, PDZD8 (PDZ domain containing 8) tethers mitochondria to the ER in mammalian cells. However, identifying PDZD8 as a &quot;functional ortholog&quot; of yeast Mmm1 (maintenance of mitochondrial morphology protein 1) is at odds with the phylogenetic data. PDZD8 and Mmm1 are paralogs, not orthologs, which affects the interpretation of the data with respect to the evolution of ER-mitochondria tethering. Our phylogenetic analyses show that PDZD8 co-occurs with ERMES components in lineages closely related to animals solidifying its identity as a paralog of Mmm1. Additionally, we identify two related paralogs, one specific to flagellated fungi, and one present only in unicellular relatives of animals. These results point to a complex evolutionary history of ER-mitochondria tethering involving multiple gene gains and losses in the lineage leading to animals and fungi.}, }
@article {pmid30107780, year = {2018}, author = {Dong, S and Zhao, C and Chen, F and Liu, Y and Zhang, S and Wu, H and Zhang, L and Liu, Y}, title = {The complete mitochondrial genome of the early flowering plant Nymphaea colorata is highly repetitive with low recombination.}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {614}, pmid = {30107780}, issn = {1471-2164}, support = {31470314//National Natural Science Foundation of China/ ; 31600171//National Natural Science Foundation of China/ ; FLSF2017-03//National Natural Science Foundation of China/ ; 201520//Shenzhen Urban Management Bureau Fund/ ; DEB-1240045//National Science Foundation/ ; JCYJ20150529150409546//Shenzhen Municipal Government of China/ ; }, mesh = {*Genome, Mitochondrial ; High-Throughput Nucleotide Sequencing/methods ; Mitochondria/*genetics ; Nymphaea/*genetics/growth &amp; development ; *Recombination, Genetic ; Repetitive Sequences, Nucleic Acid ; Sequence Analysis, DNA ; }, abstract = {BACKGROUND: Mitochondrial genomes of flowering plants (angiosperms) are highly dynamic in genome structure. The mitogenome of the earliest angiosperm Amborella is remarkable in carrying rampant foreign DNAs, in contrast to Liriodendron, the other only known early angiosperm mitogenome that is described as 'fossilized'. The distinctive features observed in the two early flowering plant mitogenomes add to the current confusions of what early flowering plants look like. Expanded sampling would provide more details in understanding the mitogenomic evolution of early angiosperms. Here we report the complete mitochondrial genome of water lily Nymphaea colorata from Nymphaeales, one of the three orders of the earliest angiosperms.<br><br>RESULTS: Assembly of data from Pac-Bio long-read sequencing yielded a circular mitochondria chromosome of 617,195 bp with an average depth of 601×. The genome encoded 41 protein coding genes, 20 tRNA and three rRNA genes with 25 group II introns disrupting 10 protein coding genes. Nearly half of the genome is composed of repeated sequences, which contributed substantially to the intron size expansion, making the gross intron length of the Nymphaea mitochondrial genome one of the longest among angiosperms, including an 11.4-Kb intron in cox2, which is the longest organellar intron reported to date in plants. Nevertheless, repeat mediated homologous recombination is unexpectedly low in Nymphaea evidenced by 74 recombined reads detected from ten recombinationally active repeat pairs among 886,982 repeat pairs examined. Extensive gene order changes were detected in the three early angiosperm mitogenomes, i.e. 38 or 44 events of inversions and translocations are needed to reconcile the mitogenome of Nymphaea with Amborella or Liriodendron, respectively. In contrast to Amborella with six genome equivalents of foreign mitochondrial DNA, not a single horizontal gene transfer event was observed in the Nymphaea mitogenome.<br><br>CONCLUSIONS: The Nymphaea mitogenome resembles the other available early angiosperm mitogenomes by a similarly rich 64-coding gene set, and many conserved gene clusters, whereas stands out by its highly repetitive nature and resultant remarkable intron expansions. The low recombination level in Nymphaea provides evidence for the predominant master conformation in vivo with a highly substoichiometric set of rearranged molecules.}, }
@article {pmid30107223, year = {2018}, author = {Reyes-Ramos, CA and Peregrino-Uriarte, AB and Cota-Ruiz, K and Valenzuela-Soto, EM and Leyva-Carrillo, L and Yepiz-Plascencia, G}, title = {Phosphoenolpyruvate carboxykinase cytosolic and mitochondrial isoforms are expressed and active during hypoxia in the white shrimp Litopenaeus vannamei.}, journal = {Comparative biochemistry and physiology. Part B, Biochemistry &amp; molecular biology}, volume = {226}, number = {}, pages = {1-9}, doi = {10.1016/j.cbpb.2018.08.001}, pmid = {30107223}, issn = {1879-1107}, mesh = {Amino Acid Sequence ; Animals ; Aquaculture ; Conserved Sequence ; Cytosol/*enzymology/metabolism ; Databases, Protein ; *Gene Expression Regulation, Developmental ; Gills/enzymology/growth &amp; development/metabolism ; Hepatopancreas/enzymology/growth &amp; development/metabolism ; Hypoxia/*enzymology/metabolism ; Isoenzymes/genetics/metabolism ; Mitochondria/*enzymology/metabolism ; Muscle, Skeletal/enzymology/growth &amp; development/metabolism ; Organ Specificity ; Penaeidae/growth &amp; development/*physiology ; Phosphoenolpyruvate Carboxykinase (GTP)/chemistry/genetics/*metabolism ; Phylogeny ; Sequence Alignment ; Sequence Homology, Amino Acid ; }, abstract = {Hypoxic zones in marine environments are spreading around the world affecting the survival of many organisms. Marine animals have several strategies to respond to hypoxia, including the regulation of gluconeogenesis. Phosphoenolpyruvate carboxykinase (PEPCK) is a key regulatory enzyme of gluconeogenesis. The objective of this work was to study two isoforms of PEPCK, one mitochondrial (PEPKC-M) and one cytosolic (PEPCK-C), from the white shrimp Litopenaeus vannamei and the response to hypoxia. Both PEPCK isoforms are 72 kDa proteins and have 92% identity at the amino acid level. The mitochondrial isoform has a N-terminal signal peptide for mitochondrial import. Gene expression and enzymatic activity in subcellular fractions were detected in gills, hepatopancreas and muscle in normoxic and hypoxic conditions. Expression of PEPCK-C was higher than PEPCK-M in all the tissues and induced in response to hypoxia at 48 h in hepatopancreas, while the enzymatic activity of PEPCK-M was higher than PEPCK-C in gills and hepatopancreas, but not in muscle and also increased in response to hypoxia in hepatopancreas but decreased in gills and muscle. During limiting oxygen conditions, shrimp tissues obtain energy by inducing anaerobic glycolysis, and although gluconeogenesis implies energy investment, due to the need to maintain glucose homeostasis, these gluconeogenic enzymes are active with contrasting behaviors in the cytosol and mitochondrial cell compartments and appear to be up-regulated in hepatopancreas indicating this tissue pivotal role in gluconeogenesis during the response to hypoxia.}, }
@article {pmid30102976, year = {2018}, author = {Baron, S and van der Merwe, NA and Maritz-Olivier, C}, title = {The genetic relationship between R. microplus and R. decoloratus ticks in South Africa and their population structure.}, journal = {Molecular phylogenetics and evolution}, volume = {129}, number = {}, pages = {60-69}, doi = {10.1016/j.ympev.2018.08.003}, pmid = {30102976}, issn = {1095-9513}, mesh = {Animals ; Base Sequence ; Cattle ; Cell Nucleus/genetics ; DNA, Ribosomal Spacer/genetics ; Electron Transport Complex IV/genetics ; Genetic Markers ; Genetic Variation ; Genetics, Population ; Geography ; Likelihood Functions ; Microsatellite Repeats/genetics ; Mitochondria/genetics ; Phylogeny ; Rhipicephalus/classification/*genetics ; South Africa ; }, abstract = {Rhipicephalus microplus and R. decoloratus are one-host ticks that preferentially feed on cattle. They are capable of transmitting various tick-borne pathogens which may be detrimental to the agricultural and livestock industry in South Africa. Previous studies have shown that R. microplus forms five lineages in the R. microplus complex, segregating into different geographical areas based on mitochondrial markers. This study examined the phylogenetic relationship within and between R. microplus and R. decoloratus using the nuclear internal transcribed spacer 2 (ITS2) and mitochondrial cytochrome oxidase subunit I (COI) genes. The results showed that the nuclear ITS2 marker is informative for interspecific variation but lacks the resolution for intraspecific variation. Analysis of the mitochondrial COI gene revealed that R. microplus ticks from South Africa grouped into a clade comprised of ticks from Asia and South America. The population structure of these two tick species was also investigated using novel microsatellite markers. Population structure analyses revealed that both the R. microplus and R. decoloratus populations presented with two genetic clusters. Rhipicephalus microplus ticks from the Kwa-Zulu Natal (KZN) province belonged to cluster 1, and those from the Eastern Cape (EC) province predominantly grouped into cluster 2. No observable population structure was noted for R. decoloratus. The overlap of genetic clusters in both species could be attributed to inbreeding between the regions by unrestricted movement of cattle across provinces. Such movement promotes tick mobility, gene flow and the homogenisation of tick populations.}, }
@article {pmid30097722, year = {2018}, author = {Ding, CQ and Ng, S and Wang, L and Wang, YC and Li, NN and Hao, XY and Zeng, JM and Wang, XC and Yang, YJ}, title = {Genome-wide identification and characterization of ALTERNATIVE OXIDASE genes and their response under abiotic stresses in Camellia sinensis (L.) O. Kuntze.}, journal = {Planta}, volume = {248}, number = {5}, pages = {1231-1247}, pmid = {30097722}, issn = {1432-2048}, support = {1610212017003//Central Public-interest Scientific Institution Basal Research Fund/ ; CARS-19//Earmarked Fund for China Agriculture Research System/ ; 2016C02053-4//The Major Project of Agricultural Science and Technology in Breeding of Tea Plant Variety in Zhejiang Province/ ; ALTF1239-2015//European Molecular Biology Organization/ ; LTFCOFUND2013//FP PEOPLE: Marie cutie actions/ ; GA-2013-609409//FP PEOPLE: Marie cutie actions/ ; }, mesh = {Camellia sinensis/enzymology/*genetics/physiology ; Cloning, Molecular ; Conserved Sequence/genetics ; Gene Expression Regulation, Plant ; Genes, Plant/genetics ; Genome, Plant/*genetics ; Mitochondrial Proteins/*genetics/physiology ; Oxidoreductases/*genetics/physiology ; Phylogeny ; Plant Proteins/*genetics/physiology ; Polymerase Chain Reaction ; Sequence Analysis, DNA ; Stress, Physiological ; Transcriptome ; }, abstract = {MAIN CONCLUSION: Four typical ALTERNATIVE OXIDASE genes have been identified in tea plants, and their sequence features and gene expression profiles have provided useful information for further studies on function and regulation. Alternative oxidase (AOX) is a terminal oxidase located in the respiratory electron transport chain. AOX catalyzes the oxidation of quinol and the reduction of oxygen into water. In this study, a genome-wide search and subsequent DNA cloning were performed to identify and characterize AOX genes in tea plant (Camellia sinensis (L.) O. Kuntze cv. Longjing43). Our results showed that tea plant possesses four AOX genes, i.e., CsAOX1a, CsAOX1d, CsAOX2a and CsAOX2b. Gene structure and protein sequence analyses revealed that all CsAOXs share a four-exon/three-intron structure with highly conserved regions and amino acid residues, which are necessary for AOX secondary structures, catalytic activities and post-translational regulations. All CsAOX were shown to localize in mitochondria using the green fluorescent protein (GFP)-targeting assay. Both CsAOX1a and CsAOX1d were induced by cold, salt and drought stresses, and with different expression patterns in young and mature leaves. Reactive oxygen species (ROS) accumulated strongly after 72 and 96 h cold treatments in both young and mature leaves, while the polyphenol and total catechin decreased significantly only in mature leaves. In comparison to AtAOX1a in Arabidopsis thaliana, CsAOX1a lost almost all of the stress-responsive cis-acting regulatory elements in its promoter region (1500 bp upstream), but possesses a flavonoid biosynthesis-related MBSII cis-acting regulatory element. These results suggest a link between CsAOX1a function and the metabolism of some secondary metabolites in tea plant. Our studies provide a basis for the further elucidation of the biological function and regulation of the AOX pathway in tea plants.}, }
@article {pmid30086814, year = {2018}, author = {Yurchenko, V and Lukeš, J}, title = {Parasites and their (endo)symbiotic microbes.}, journal = {Parasitology}, volume = {145}, number = {10}, pages = {1261-1264}, doi = {10.1017/S0031182018001257}, pmid = {30086814}, issn = {1469-8161}, mesh = {Animals ; Biological Evolution ; Organelles ; Parasites/*microbiology ; *Symbiosis ; }, abstract = {Thanks to modern molecular biology methods, our understanding of the impact of (endo)symbiotic bacteria on parasitic protists and helminths is growing fast. In this issue, 9 papers have been brought together that describe various facets of the relationships between these microorganisms, reveal their range and high frequency, as well as their capacity to create novel biological complexity. Comparative analyses of these host-endosymbiont interactions indicate that there may be no discrete types of relationships but rather a continuum ranging from a dispensable endosymbiont minimally integrated within the host cell to organelles, such as mitochondria and plastids that evolved into an indispensable, deeply integrated components of the cell. We hope that this series of studies on parasites and (endo)symbiotic bacteria will increase awareness about these relationships and their representation in microbial ecology models.}, }
@article {pmid30086701, year = {2018}, author = {Skoracka, A and Lopes, LF and Alves, MJ and Miller, A and Lewandowski, M and Szydło, W and Majer, A and Różańska, E and Kuczyński, L}, title = {Genetics of lineage diversification and the evolution of host usage in the economically important wheat curl mite, Aceria tosichella Keifer, 1969.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {122}, pmid = {30086701}, issn = {1471-2148}, support = {No. 01/KNOW2/2014//Funding for open access charge: Ministry of Science and Higher Education of the Republic of Poland, from the quality promoting subsidy, under the Leading National Research Centre (KNOW) program for the years 2014-2019/International ; 2011/03/B/NZ8/00129//Narodowe Centrum Nauki/International ; 2011/01/N/NZ8/04540//Narodowe Centrum Nauki/International ; UID/BIA/00329/2013//Fundação para a Ciência e a Tecnologia/International ; UID/BIA/00329/2013//Fundação para a Ciência e a Tecnologia/International ; }, mesh = {Animals ; Base Sequence ; Bayes Theorem ; Calibration ; DNA, Mitochondrial/genetics ; Demography ; Gene Flow ; Genetic Variation ; Host-Pathogen Interactions/*genetics ; Mites/*classification/*genetics ; Mitochondria/genetics ; *Phylogeny ; Plant Diseases/*parasitology ; Time Factors ; Triticum/*parasitology ; }, abstract = {BACKGROUND: Understanding the mechanisms that underlie the diversification of herbivores through interactions with their hosts is important for their diversity assessment and identification of expansion events, particularly in a human-altered world where evolutionary processes can be exacerbated. We studied patterns of host usage and genetic structure in the wheat curl mite complex (WCM), Aceria tosichella, a major pest of the world's grain industry, to identify the factors behind its extensive diversification.<br><br>RESULTS: We expanded on previous phylogenetic research, demonstrating deep lineage diversification within the taxon, a complex of distinctive host specialist and generalist lineages more diverse than previously assumed. Time-calibrated phylogenetic reconstruction inferred from mitochondrial DNA sequence data suggests that lineage diversification pre-dates the influence of agricultural practices, and lineages started to radiate in the mid Miocene when major radiations of C4 grasses is known to have occurred. Furthermore, we demonstrated that host specificity is not phylogenetically constrained, while host generalization appears to be a more derived trait coinciding with the expansion of the world's grasslands. Demographic history of specialist lineages have been more stable when compared to generalists, and their expansion pre-dated all generalist lineages. The lack of host-associated genetic structure of generalists indicates gene flow between mite populations from different hosts.<br><br>CONCLUSIONS: Our analyses demonstrated that WCM is an unexpectedly diverse complex of genetic lineages and its differentiation is likely associated with the time of diversification and expansion of its hosts. Signatures of demographic histories and expansion of generalists are consistent with the observed proliferation of the globally most common lineages. The apparent lack of constrains on host use, coupled with a high colonization potential, hinders mite management, which may be further compromised by host range expansion. This study provides a significant contribution to the growing literature on host-association and diversification in herbivorous invertebrates.}, }
@article {pmid30075756, year = {2018}, author = {Burke, SV and Ungerer, MC and Duvall, MR}, title = {Investigation of mitochondrial-derived plastome sequences in the Paspalum lineage (Panicoideae; Poaceae).}, journal = {BMC plant biology}, volume = {18}, number = {1}, pages = {152}, pmid = {30075756}, issn = {1471-2229}, support = {DEB-1120856//National Science Foundation/ ; DEB-1120761//National Science Foundation/ ; }, mesh = {DNA, Intergenic/genetics ; DNA, Plant/genetics ; Mitochondria/*genetics ; Paspalum/*genetics ; Phylogeny ; Plastids/*genetics ; Poaceae/genetics ; Sequence Alignment ; Sequence Homology, Nucleic Acid ; }, abstract = {BACKGROUND: The grass family (Poaceae), ca. 12,075 species, is a focal point of many recent studies that aim to use complete plastomes to reveal and strengthen relationships within the family. The use of Next Generation Sequencing technology has revealed intricate details in many Poaceae plastomes; specifically the trnI - trnL intergenic spacer region. This study investigates this region and the putative mitochondrial inserts within it in complete plastomes of Paspalum and other Poaceae.<br><br>RESULTS: Nine newly sequenced plastomes, seven of which contain an insert within the trnI - trnL intergenic spacer, were combined into plastome phylogenomic and divergence date analyses with 52 other species. A robust Paspalum topology was recovered, originating at 10.6 Ma, with the insert arising at 8.7 Ma. The alignment of the insert across Paspalum reveals 21 subregions with pairwise homology in 19. In an analysis of emergent self-organizing maps of tetranucleotide frequencies, the Paspalum insert grouped with mitochondrial DNA.<br><br>CONCLUSIONS: A hypothetical ancestral insert, 17,685 bp in size, was found in the trnI - trnL intergenic spacer for the Paspalum lineage. A different insert, 2808 bp, was found in the same region for Paraneurachne muelleri. Seven different intrastrand deletion events were found within the Paspalum lineage, suggesting selective pressures to remove large portions of noncoding DNA. Finally, a tetranucleotide frequency analysis was used to determine that the origin of the insert in the Paspalum lineage is mitochondrial DNA.}, }
@article {pmid30074999, year = {2018}, author = {Brew-Appiah, RAT and York, ZB and Krishnan, V and Roalson, EH and Sanguinet, KA}, title = {Genome-wide identification and analysis of the ALTERNATIVE OXIDASE gene family in diploid and hexaploid wheat.}, journal = {PloS one}, volume = {13}, number = {8}, pages = {e0201439}, pmid = {30074999}, issn = {1932-6203}, mesh = {Aegilops/*genetics ; Diploidy ; Gene Expression Regulation, Developmental/physiology ; Gene Expression Regulation, Plant/physiology ; Genes, Plant/*genetics ; Genome, Plant/genetics ; Herbicide Resistance/genetics ; Mitochondrial Proteins/*genetics ; Multigene Family/*genetics ; Oxidoreductases/*genetics ; Phylogeny ; Plant Proteins/*genetics ; Polyploidy ; Stress, Physiological/physiology ; Triticum/genetics/*physiology ; Whole Genome Sequencing ; }, abstract = {A comprehensive understanding of wheat responses to environmental stress will contribute to the long-term goal of feeding the planet. ALERNATIVE OXIDASE (AOX) genes encode proteins involved in a bypass of the electron transport chain and are also known to be involved in stress tolerance in multiple species. Here, we report the identification and characterization of the AOX gene family in diploid and hexaploid wheat. Four genes each were found in the diploid ancestors Triticum urartu, and Aegilops tauschii, and three in Aegilops speltoides. In hexaploid wheat (Triticum aestivum), 20 genes were identified, some with multiple splice variants, corresponding to a total of 24 proteins for those with observed transcription and translation. These proteins were classified as AOX1a, AOX1c, AOX1e or AOX1d via phylogenetic analysis. Proteins lacking most or all signature AOX motifs were assigned to putative regulatory roles. Analysis of protein-targeting sequences suggests mixed localization to the mitochondria and other organelles. In comparison to the most studied AOX from Trypanosoma brucei, there were amino acid substitutions at critical functional domains indicating possible role divergence in wheat or grasses in general. In hexaploid wheat, AOX genes were expressed at specific developmental stages as well as in response to both biotic and abiotic stresses such as fungal pathogens, heat and drought. These AOX expression patterns suggest a highly regulated and diverse transcription and expression system. The insights gained provide a framework for the continued and expanded study of AOX genes in wheat for stress tolerance through breeding new varieties, as well as resistance to AOX-targeted herbicides, all of which can ultimately be used synergistically to improve crop yield.}, }
@article {pmid30071112, year = {2018}, author = {Caza, M and Hu, G and Nielson, ED and Cho, M and Jung, WH and Kronstad, JW}, title = {The Sec1/Munc18 (SM) protein Vps45 is involved in iron uptake, mitochondrial function and virulence in the pathogenic fungus Cryptococcus neoformans.}, journal = {PLoS pathogens}, volume = {14}, number = {8}, pages = {e1007220}, pmid = {30071112}, issn = {1553-7374}, support = {MOP13234//Canadian Institutes of Health Research/International ; R01 AI053721/AI/NIAID NIH HHS/United States ; }, mesh = {Animals ; Biological Transport ; Cryptococcosis/metabolism/microbiology/pathology ; *Cryptococcus neoformans/genetics/metabolism/pathogenicity ; Female ; Fungal Proteins/*physiology ; Iron/*metabolism ; Mice ; Mice, Inbred BALB C ; Mitochondria/*physiology ; Organisms, Genetically Modified ; Phylogeny ; Virulence/*genetics ; Virulence Factors/genetics/*physiology ; }, abstract = {The battle for iron between invading microorganisms and mammalian hosts is a pivotal determinant of the outcome of infection. The pathogenic fungus, Cryptococcus neoformans, employs multiple mechanisms to compete for iron during cryptococcosis, a disease primarily of immunocompromised hosts. In this study, we examined the role of endocytic trafficking in iron uptake by characterizing a mutant defective in the Sec1/Munc18 (SM) protein Vps45. This protein is known to regulate the machinery for vesicle trafficking and fusion via interactions with SNARE proteins. As expected, a vps45 deletion mutant was impaired in endocytosis and showed sensitivity to trafficking inhibitors. The mutant also showed poor growth on iron-limited media and a defect in transporting the Cfo1 ferroxidase of the high-affinity iron uptake system from the plasma membrane to the vacuole. Remarkably, we made the novel observation that Vps45 also contributes to mitochondrial function in that a Vps45-Gfp fusion protein associated with mitotracker, and a vps45 mutant showed enhanced sensitivity to inhibitors of electron transport complexes as well as changes in mitochondrial membrane potential. Consistent with mitochondrial function, the vps45 mutant was impaired in calcium homeostasis. To assess the relevance of these defects for virulence, we examined cell surface properties of the vps45 mutant and found increased sensitivity to agents that challenge cell wall integrity and to antifungal drugs. A change in cell wall properties was consistent with our observation of altered capsule polysaccharide attachment, and with attenuated virulence in a mouse model of cryptococcosis. Overall, our studies reveal a novel role for Vps45-mediated trafficking for iron uptake, mitochondrial function and virulence.}, }
@article {pmid30060189, year = {2018}, author = {Río Bártulos, C and Rogers, MB and Williams, TA and Gentekaki, E and Brinkmann, H and Cerff, R and Liaud, MF and Hehl, AB and Yarlett, NR and Gruber, A and Kroth, PG and van der Giezen, M}, title = {Mitochondrial Glycolysis in a Major Lineage of Eukaryotes.}, journal = {Genome biology and evolution}, volume = {10}, number = {9}, pages = {2310-2325}, pmid = {30060189}, issn = {1759-6653}, support = {//Wellcome Trust/United Kingdom ; 078566/A/05/Z//Wellcome Trust/United Kingdom ; }, mesh = {Biological Evolution ; Blastocystis/cytology/enzymology/genetics/*metabolism ; Diatoms/cytology/enzymology/genetics/*metabolism ; Energy Metabolism ; Genome, Mitochondrial ; *Glycolysis ; Mitochondria/genetics/*metabolism ; Symbiosis ; Transformation, Genetic ; }, abstract = {The establishment of the mitochondrion is seen as a transformational step in the origin of eukaryotes. With the mitochondrion came bioenergetic freedom to explore novel evolutionary space leading to the eukaryotic radiation known today. The tight integration of the bacterial endosymbiont with its archaeal host was accompanied by a massive endosymbiotic gene transfer resulting in a small mitochondrial genome which is just a ghost of the original incoming bacterial genome. This endosymbiotic gene transfer resulted in the loss of many genes, both from the bacterial symbiont as well the archaeal host. Loss of genes encoding redundant functions resulted in a replacement of the bulk of the host's metabolism for those originating from the endosymbiont. Glycolysis is one such metabolic pathway in which the original archaeal enzymes have been replaced by bacterial enzymes from the endosymbiont. Glycolysis is a major catabolic pathway that provides cellular energy from the breakdown of glucose. The glycolytic pathway of eukaryotes appears to be bacterial in origin, and in well-studied model eukaryotes it takes place in the cytosol. In contrast, here we demonstrate that the latter stages of glycolysis take place in the mitochondria of stramenopiles, a diverse and ecologically important lineage of eukaryotes. Although our work is based on a limited sample of stramenopiles, it leaves open the possibility that the mitochondrial targeting of glycolytic enzymes in stramenopiles might represent the ancestral state for eukaryotes.}, }
@article {pmid30059499, year = {2018}, author = {Gao, B and Peng, C and Chen, Q and Zhang, J and Shi, Q}, title = {Mitochondrial genome sequencing of a vermivorous cone snail Conus quercinus supports the correlative analysis between phylogenetic relationships and dietary types of Conus species.}, journal = {PloS one}, volume = {13}, number = {7}, pages = {e0193053}, pmid = {30059499}, issn = {1932-6203}, mesh = {Animals ; Annelida ; Base Composition ; Base Sequence ; Biological Evolution ; Chromosome Mapping ; Conotoxins/*genetics ; Conus Snail/classification/*genetics ; Food Chain ; Gene Ontology ; Genome Size ; *Genome, Mitochondrial ; Mitochondria/*genetics ; Molecular Sequence Annotation ; Open Reading Frames ; Phylogeny ; RNA, Ribosomal/*genetics ; RNA, Transfer/*genetics ; Sequence Alignment ; Sequence Homology, Nucleic Acid ; Tandem Repeat Sequences ; }, abstract = {Complete mitochondrial genome (mitogenome) sequence of a worm-hunting cone snail, Conus quercinus, was reported in this study. Its mitogenome, the longest one (16,460 bp) among reported Conus specie, is composed of 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA) genes and one D-loop region. The mitochondrial gene arrangement is highly-conserved and identical to other reported. However, the D-loop region of C. quercinus is the longest (943 bp) with the higher A+T content (71.3%) and a long AT tandem repeat stretch (68 bp). Subsequent phylogenetic analysis demonstrated that three different dietary types (vermivorous, molluscivorous and piscivorous) of cone snails are clustered separately, suggesting that the phylogenetics of cone snails is related to their dietary types. In conclusion, our current work improves our understanding of the mitogenomic structure and evolutionary status of the vermivorous C. quercinus, which support the putative hypothesis that the Conus ancestor was vermivorous.}, }
@article {pmid30056805, year = {2018}, author = {Seixas, FA and Boursot, P and Melo-Ferreira, J}, title = {The genomic impact of historical hybridization with massive mitochondrial DNA introgression.}, journal = {Genome biology}, volume = {19}, number = {1}, pages = {91}, pmid = {30056805}, issn = {1474-760X}, support = {FCT-ANR/BIA-EVF/0250/2012//Fundação para a Ciência e a Tecnologia/International ; IF/00033/2014/CP1256/CT0005//Fundação para a Ciência e a Tecnologia/International ; SFRH/BD/87126/2012//Fundação para a Ciência e a Tecnologia/International ; ANR-12-ISV7-0002-01//Agence Nationale de la Recherche/International ; NORTE-01-0145-FEDER-000007//NORTE2020, ERDF/International ; }, mesh = {Adaptation, Biological/genetics ; *Animal Migration ; Animals ; Cell Nucleus/genetics ; DNA, Mitochondrial/*genetics ; Europe ; Genetics, Population ; *Genome ; *Hybridization, Genetic ; Lagomorpha/classification/*genetics ; Mitochondria/genetics ; Models, Genetic ; Phylogeny ; Recombination, Genetic ; Selection, Genetic ; Whole Genome Sequencing ; X Chromosome/chemistry ; }, abstract = {BACKGROUND: The extent to which selection determines interspecific patterns of genetic exchange enlightens the role of adaptation in evolution and speciation. Often reported extensive interspecific introgression could be selection-driven, but also result from demographic processes, especially in cases of invasive species replacements, which can promote introgression at their invasion front. Because invasion and selective sweeps similarly mold variation, population genetics evidence for selection can only be gathered in an explicit demographic framework. The Iberian hare, Lepus granatensis, displays in its northern range extensive mitochondrial DNA introgression from L. timidus, an arctic/boreal species that it replaced locally after the last glacial maximum. We use whole-genome sequencing to infer geographic and genomic patterns of nuclear introgression and fit a neutral model of species replacement with hybridization, allowing us to evaluate how selection influenced introgression genome-wide, including for mtDNA.<br><br>RESULTS: Although the average nuclear and mtDNA introgression patterns contrast strongly, they fit a single demographic model of post-glacial invasive replacement of timidus by granatensis. Outliers of elevated introgression include several genes related to immunity, spermatogenesis, and mitochondrial metabolism. Introgression is reduced on the X chromosome and in low recombining regions.<br><br>CONCLUSIONS: General nuclear and mtDNA patterns of introgression can be explained by purely demographic processes. Hybrid incompatibilities and interplay between selection and recombination locally modulate levels of nuclear introgression. Selection promoted introgression of some genes involved in conflicts, either interspecific (parasites) or possibly cytonuclear. In the latter case, nuclear introgression could mitigate the potential negative effects of alien mtDNA on mitochondrial metabolism and male-specific traits.}, }
@article {pmid30055354, year = {2018}, author = {Linard, B and Crampton-Platt, A and Moriniere, J and Timmermans, MJTN and Andújar, C and Arribas, P and Miller, KE and Lipecki, J and Favreau, E and Hunter, A and Gómez-Rodríguez, C and Barton, C and Nie, R and Gillett, CPDT and Breeschoten, T and Bocak, L and Vogler, AP}, title = {The contribution of mitochondrial metagenomics to large-scale data mining and phylogenetic analysis of Coleoptera.}, journal = {Molecular phylogenetics and evolution}, volume = {128}, number = {}, pages = {1-11}, doi = {10.1016/j.ympev.2018.07.008}, pmid = {30055354}, issn = {1095-9513}, mesh = {Algorithms ; Animals ; Base Sequence ; Coleoptera/classification/*genetics ; Databases, Genetic ; *Metagenomics ; Mitochondria/*genetics ; *Phylogeny ; }, abstract = {A phylogenetic tree at the species level is still far off for highly diverse insect orders, including the Coleoptera, but the taxonomic breadth of public sequence databases is growing. In addition, new types of data may contribute to increasing taxon coverage, such as metagenomic shotgun sequencing for assembly of mitogenomes from bulk specimen samples. The current study explores the application of these techniques for large-scale efforts to build the tree of Coleoptera. We used shotgun data from 17 different ecological and taxonomic datasets (5 unpublished) to assemble a total of 1942 mitogenome contigs of >3000 bp. These sequences were combined into a single dataset together with all mitochondrial data available at GenBank, in addition to nuclear markers widely used in molecular phylogenetics. The resulting matrix of nearly 16,000 species with two or more loci produced trees (RAxML) showing overall congruence with the Linnaean taxonomy at hierarchical levels from suborders to genera. We tested the role of full-length mitogenomes in stabilizing the tree from GenBank data, as mitogenomes might link terminals with non-overlapping gene representation. However, the mitogenome data were only partly useful in this respect, presumably because of the purely automated approach to assembly and gene delimitation, but improvements in future may be possible by using multiple assemblers and manual curation. In conclusion, the combination of data mining and metagenomic sequencing of bulk samples provided the largest phylogenetic tree of Coleoptera to date, which represents a summary of existing phylogenetic knowledge and a defensible tree of great utility, in particular for studies at the intra-familial level, despite some shortcomings for resolving basal nodes.}, }
@article {pmid30055249, year = {2018}, author = {Torrezan-Nitao, E and Figueiredo, RCBQ and Marques-Santos, LF}, title = {Mitochondrial permeability transition pore in sea urchin female gametes.}, journal = {Mechanisms of development}, volume = {154}, number = {}, pages = {208-218}, doi = {10.1016/j.mod.2018.07.008}, pmid = {30055249}, issn = {1872-6356}, abstract = {Mitochondrial permeability transition pore (MPTP) has been associated to calcium homeostasis and reactive oxygen species (ROS) generation in several cell types. While extensively investigated in somatic cells, there are few data regarding MPTP phenomenon in gametes. The aim of the present work was to investigate MPTP occurrence in sea urchin female gametes. The protonophores CCCP and FCCP, and the Ca2+ ionophore ionomycin, were used as pore inductors. Pore opening was monitored by mitochondrial potential sensitive probes and cobalt-quenched calcein assay. The pore desensitizer cyclosporin A (CsA) prevented the loss of mitochondrial inner membrane potential (ΔΨm) and pore opening induced by MPTP activators. The disruption of ΔΨm led to an increase in ROS generation, which was completely prevented by CsA. Our data also demonstrated that the increase in ROS production induced by MPTP opening requires extracellular Ca2+. In summary, the current study provides evidence about the occurrence of MPTP in sea urchin eggs in a similar manner as described in vertebrate somatic cells - CsA-sensitive, voltage- and Ca2+-triggered - and shows MPTP as a highly conserved physiological event through the evolution.}, }
@article {pmid30046113, year = {2018}, author = {Dhir, A and Dhir, S and Borowski, LS and Jimenez, L and Teitell, M and Rötig, A and Crow, YJ and Rice, GI and Duffy, D and Tamby, C and Nojima, T and Munnich, A and Schiff, M and de Almeida, CR and Rehwinkel, J and Dziembowski, A and Szczesny, RJ and Proudfoot, NJ}, title = {Mitochondrial double-stranded RNA triggers antiviral signalling in humans.}, journal = {Nature}, volume = {560}, number = {7717}, pages = {238-242}, doi = {10.1038/s41586-018-0363-0}, pmid = {30046113}, issn = {1476-4687}, support = {107928/Z/15/Z//Wellcome Trust/United Kingdom ; GM073981/GM/NIGMS NIH HHS/United States ; }, abstract = {Mitochondria are descendants of endosymbiotic bacteria and retain essential prokaryotic features such as a compact circular genome. Consequently, in mammals, mitochondrial DNA is subjected to bidirectional transcription that generates overlapping transcripts, which are capable of forming long double-stranded RNA structures1,2. However, to our knowledge, mitochondrial double-stranded RNA has not been previously characterized in vivo. Here we describe the presence of a highly unstable native mitochondrial double-stranded RNA species at single-cell level and identify key roles for the degradosome components mitochondrial RNA helicase SUV3 and polynucleotide phosphorylase PNPase in restricting the levels of mitochondrial double-stranded RNA. Loss of either enzyme results in massive accumulation of mitochondrial double-stranded RNA that escapes into the cytoplasm in a PNPase-dependent manner. This process engages an MDA5-driven antiviral signalling pathway that triggers a type I interferon response. Consistent with these data, patients carrying hypomorphic mutations in the gene PNPT1, which encodes PNPase, display mitochondrial double-stranded RNA accumulation coupled with upregulation of interferon-stimulated genes and other markers of immune activation. The localization of PNPase to the mitochondrial inter-membrane space and matrix suggests that it has a dual role in preventing the formation and release of mitochondrial double-stranded RNA into the cytoplasm. This in turn prevents the activation of potent innate immune defence mechanisms that have evolved to protect vertebrates against microbial and viral attack.}, }
@article {pmid30042786, year = {2018}, author = {Riggs, CL and Summers, A and Warren, DE and Nilsson, GE and Lefevre, S and Dowd, WW and Milton, S and Podrabsky, JE}, title = {Small Non-coding RNA Expression and Vertebrate Anoxia Tolerance.}, journal = {Frontiers in genetics}, volume = {9}, number = {}, pages = {230}, pmid = {30042786}, issn = {1664-8021}, abstract = {Background: Extreme anoxia tolerance requires a metabolic depression whose modulation could involve small non-coding RNAs (small ncRNAs), which are specific, rapid, and reversible regulators of gene expression. A previous study of small ncRNA expression in embryos of the annual killifish Austrofundulus limnaeus, the most anoxia-tolerant vertebrate known, revealed a specific expression pattern of small ncRNAs that could play important roles in anoxia tolerance. Here, we conduct a comparative study on the presence and expression of small ncRNAs in the most anoxia-tolerant representatives of several major vertebrate lineages, to investigate the evolution of and mechanisms supporting extreme anoxia tolerance. The epaulette shark (Hemiscyllium ocellatum), crucian carp (Carassius carassius), western painted turtle (Chrysemys picta bellii), and leopard frog (Rana pipiens) were exposed to anoxia and recovery, and small ncRNAs were sequenced from the brain (one of the most anoxia-sensitive tissues) prior to, during, and following exposure to anoxia. Results: Small ncRNA profiles were broadly conserved among species under normoxic conditions, and these expression patterns were largely conserved during exposure to anoxia. In contrast, differentially expressed genes are mostly unique to each species, suggesting that each species may have evolved distinct small ncRNA expression patterns in response to anoxia. Mitochondria-derived small ncRNAs (mitosRNAs) which have a robust response to anoxia in A. limnaeus embryos, were identified in the other anoxia tolerant vertebrates here but did not display a similarly robust response to anoxia. Conclusion: These findings support an overall stabilization of the small ncRNA transcriptome during exposure to anoxic insults, but also suggest that multiple small ncRNA expression pathways may support anoxia tolerance, as no conserved small ncRNA response was identified among the anoxia-tolerant vertebrates studied. This may reflect divergent strategies to achieve the same endpoint: anoxia tolerance. However, it may also indicate that there are multiple cellular pathways that can trigger the same cellular and physiological survival processes, including hypometabolism.}, }
@article {pmid30041026, year = {2018}, author = {Bogarín, D and Pérez-Escobar, OA and Groenenberg, D and Holland, SD and Karremans, AP and Lemmon, EM and Lemmon, AR and Pupulin, F and Smets, E and Gravendeel, B}, title = {Anchored hybrid enrichment generated nuclear, plastid and mitochondrial markers resolve the Lepanthes horrida (Orchidaceae: Pleurothallidinae) species complex.}, journal = {Molecular phylogenetics and evolution}, volume = {129}, number = {}, pages = {27-47}, doi = {10.1016/j.ympev.2018.07.014}, pmid = {30041026}, issn = {1095-9513}, mesh = {Cell Nucleus/*genetics ; Cluster Analysis ; Databases, Genetic ; Flowers/anatomy &amp; histology ; Genetic Loci ; Genetic Markers ; *Hybridization, Genetic ; Likelihood Functions ; Mitochondria/*genetics ; Orchidaceae/*genetics ; Phylogeny ; Plastids/*genetics ; Species Specificity ; }, abstract = {Phylogenetic relationships in species complexes and lineages derived from rapid diversifications are often challenging to resolve using morphology or standard DNA barcoding markers. The hyper-diverse genus Lepanthes from Neotropical cloud forest includes over 1200 species and many recent, explosive diversifications that have resulted in poorly supported nodes and morphological convergence across clades. Here, we assess the performance of 446 nuclear-plastid-mitochondrial markers derived from an anchored hybrid enrichment approach (AHE) coupled with coalescence- and species network-based inferences to resolve phylogenetic relationships and improve species recognition in the Lepanthes horrida species group. In addition to using orchid-specific probes to increase enrichment efficiency, we improved gene tree resolution by extending standard angiosperm targets into adjacent exons. We found high topological discordance among individual gene trees, suggesting that hybridization/polyploidy may have promoted speciation in the lineage via formation of new hybrid taxa. In addition, we identified ten loci with the highest phylogenetic informativeness values from these genomes. Most previous phylogenetic sampling in the Pleurothallidinae relies on two regions (ITS and matK), therefore, the evaluation of other markers such as those shown here may be useful in future phylogenetic studies in the orchid family. Coalescent-based species tree estimation methods resolved the phylogenetic relationships of the L. horrida species group. The resolution of the phylogenetic estimations was improved with the inclusion of extended anchor targets. This approach produced longer loci with higher discriminative power. These analyses also disclosed two undescribed species, L. amicitiae and L. genetoapophantica, formally described here, which are also supported by morphology. Our study demonstrates the utility of combined genomic evidence to disentangle phylogenetic relationships at very shallow levels of the tree of life, and in clades showing convergent trait evolution. With a fully resolved phylogeny, is it possible to disentangle traits evolving in parallel or convergently across these orchid lineages such as flower color and size from diagnostic traits such as the shape and orientation of the lobes of the petals and lip.}, }
@article {pmid30032461, year = {2018}, author = {Sylvester, C and Krishna, MS and Rao, JS and Chandrasekar, A}, title = {Neolithic phylogenetic continuity inferred from complete mitochondrial DNA sequences in a tribal population of Southern India.}, journal = {Genetica}, volume = {146}, number = {4-5}, pages = {383-389}, pmid = {30032461}, issn = {1573-6857}, mesh = {Asian Continental Ancestry Group/genetics ; DNA, Mitochondrial/*genetics ; Ethnic Groups/*genetics ; Female ; Genetic Variation/genetics ; Genetics, Population/methods ; Genome, Mitochondrial/*genetics ; Haplotypes/genetics ; Humans ; India/ethnology ; Male ; Mitochondria/genetics ; Phylogeny ; Phylogeography/methods ; Sequence Analysis, DNA/methods ; }, abstract = {The subsequent human migrations that dispersed out of Africa, both prehistoric and historic and colonization of India by modern humans is unanimous, and phylogeny of major mitochondrial DNA haplogroups have played a key role in assessing the genetic origin of people of India. To address more such events, complete mitogenomes of 113 Melakudiya tribe of Southern India were sequenced and 46 individuals showed the presence of west Eurasian autochthonous haplogroups HV14 and U7. Phylogenetic analysis revealed two novel subclades HV14a1b and HV14a1b1 and sequences representing haplogroup U7 were included under previously described subclade U7a3a1a2* specific to India. Moreover, the present analysis on complete mtDNA reveals addition information of the spread and distribution of west Eurasian haplogroups in southern India, in tracing an unexplored genetic link between Melakudiya tribe with the people of Iranian Plateau, South Caucasus, and Central Asia. Coalescence ages of HV14 and U7a3a1a2* trees in the present study dates ~ 16.1 ± 4.3 and ~ 13.4 ± 5.6 kya respectively.}, }
@article {pmid30026124, year = {2018}, author = {Ferreira, M and Fernandes, AM and Aleixo, A and Antonelli, A and Olsson, U and Bates, JM and Cracraft, J and Ribas, CC}, title = {Evidence for mtDNA capture in the jacamar Galbula leucogastra/chalcothorax species-complex and insights on the evolution of white-sand ecosystems in the Amazon basin.}, journal = {Molecular phylogenetics and evolution}, volume = {129}, number = {}, pages = {149-157}, doi = {10.1016/j.ympev.2018.07.007}, pmid = {30026124}, issn = {1095-9513}, mesh = {Animals ; Bayes Theorem ; *Biological Evolution ; Birds/*genetics ; Brazil ; Cell Nucleus/genetics ; DNA, Mitochondrial/*genetics ; *Ecosystem ; Gene Flow ; Genetic Loci ; Genome, Mitochondrial ; Haplotypes/genetics ; Mitochondria/genetics ; Phylogeny ; Phylogeography ; Sequence Analysis, DNA ; Species Specificity ; }, abstract = {Jacamar species occur throughout Amazonia, with most species occupying forested habitats. One species-complex, Galbula leucogastra/chalcothorax, is associated to white sand ecosystems (WSE). Previous studies of WSE bird species recovered shallow genetic structure in mtDNA coupled with signs of gene flow among WSE patches. Here, we characterize diversification of the G. leucogastra/chalcothorax species-complex with dense sampling across its distribution using mitochondrial and genomic (Ultraconserved Elements, UCEs) DNA sequences. We performed concatenated likelihood and Bayesian analysis, as well as a species-tree analysis using ∗BEAST, to establish the phylogenetic relationships among populations. The mtDNA results recovered at least six geographically-structured lineages, with G. chalcothorax embedded within lineages of G. leucogastra. In contrast, both concatenated and species-tree analyses of UCE data recovered G. chalcothorax as sister to all G. leucogastra lineages. We hypothesize that the mitochondrial genome of one of the G. leucogastra lineage (Madeira) was captured into G. chalcothorax in the past. We discuss how WSE evolution and the coevolution of mtDNA and nuclear genes might have played a role in this apparently rare event.}, }
@article {pmid30022808, year = {2018}, author = {Lang, SA and Shain, DH}, title = {Atypical Evolution of the F1Fo Adenosine Triphosphate Synthase Regulatory ATP6 subunit in Glacier Ice Worms (Annelida: Clitellata: Mesenchytraeus).}, journal = {Evolutionary bioinformatics online}, volume = {14}, number = {}, pages = {1176934318788076}, pmid = {30022808}, issn = {1176-9343}, abstract = {The glacier ice worm, Mesenchytraeus solifugus, is among a few animals that reside permanently in glacier ice. Their adaptation to cold temperature has been linked to relatively high intracellular adenosine triphosphate (ATP) levels, which compensate for reductions in molecular motion at low physiological temperatures. Here, we show that ATP6-the critical regulatory subunit of the F1Fo-ATP synthase and primary target of mitochondrial disease-acquired an unprecedented histidine-rich, 18-amino acid carboxy-terminal extension, which counters the strong evolutionary trend of mitochondrial genome compaction. Furthermore, sequence analysis suggests that this insertion is not of metazoan origin, but rather is a product of horizontal gene transfer from a microbial dietary source, and may act as a proton shuttle to accelerate the rate of ATP synthesis.}, }
@article {pmid30021129, year = {2018}, author = {Sun, S and Sha, Z and Wang, Y}, title = {Complete mitochondrial genome of the first deep-sea spongicolid shrimp Spongiocaris panglao (Decapoda: Stenopodidea): Novel gene arrangement and the phylogenetic position and origin of Stenopodidea.}, journal = {Gene}, volume = {676}, number = {}, pages = {123-138}, doi = {10.1016/j.gene.2018.07.026}, pmid = {30021129}, issn = {1879-0038}, mesh = {Animals ; Base Composition ; Decapoda (Crustacea)/*genetics ; Gene Order ; Genome Size ; Genome, Mitochondrial ; High-Throughput Nucleotide Sequencing/*methods ; Mitochondria/*genetics ; Nucleic Acid Conformation ; Phylogeny ; RNA/chemistry ; RNA, Mitochondrial ; Sequence Analysis, DNA/*methods ; }, abstract = {Stenopodidea Claus, 1872 (Crustacea: Decapoda) is one of the major groups of decapods crustaceans. Hitherto, only one complete mitochondrial genome (mitogenome) from the family Stenopodidae is available for the infraorder Stenopodidea. Here, we determined the complete mitogenome of Spongiocaris panglao de Grave and Saito, 2016 using Illumina sequencing, representing the first species from the family Spongicolidae. The 15,909 bp genome is a circular molecule and consists of 13 protein-coding genes (PCGs), 2 ribosomal RNA (rRNA) genes, 22 transfer RNA (tRNA) genes and one control region. Although the overall genome organization is typical for metazoans, the mitogenome of S. panglao shows some derived characters. A + T content of 77.42% in S. pamglao mitogenome is second-highest among the dacapods described to date. The trnR gene exhibit modified secondary structure with the TψC loop completely missing, which might be a putative autapomorphy of S. pamglao mitogenome. Compared with the shallow-water stenopodidean species S. hispidus, the control region of S. pamglao exhibits three characteristics: larger size, higher A + T content, and more tandem repeat sequences. The gene order exhibited difference from the ancestral mitogenome pattern of the Pancrustacea, with 5 tRNA genes rearrangement. The result from BI was agreed with most morphological characters and molecular evidences, revealing that Stenopodidea and Reptantia had the closest relationship, as the sister group of Caridea. Still, the alternative hypothesis supported from ML topology cannot be completely rejected based on the current data. Estimated times revealed that the two stenopodideans families Stenopodidae and Spongicolidae diverged from each other around 122 Mya. The divergence time of spongicolid shrimp is in good agreement with the origin of their hexactinellid hosts (78-144 Mya).}, }
@article {pmid30017823, year = {2018}, author = {Chesser, RT and Vaseghi, H and Hosner, PA and Bergner, LM and Cortes-Rodriguez, MN and Welch, AJ and Collins, CT}, title = {Molecular systematics of swifts of the genus Chaetura (Aves: Apodiformes: Apodidae).}, journal = {Molecular phylogenetics and evolution}, volume = {128}, number = {}, pages = {162-171}, doi = {10.1016/j.ympev.2018.07.006}, pmid = {30017823}, issn = {1095-9513}, mesh = {Animals ; Birds/*classification ; Cell Nucleus/genetics ; DNA, Mitochondrial/genetics ; Mitochondria/genetics ; North America ; Panama ; Phylogeny ; Seasons ; South America ; Species Specificity ; }, abstract = {Phylogenetic relationships among swifts of the morphologically conservative genus Chaetura were studied using mitochondrial and nuclear DNA sequences. Taxon sampling included all species and 21 of 30 taxa (species and subspecies) within Chaetura. Our results indicate that Chaetura is monophyletic and support the division of the genus into the two subgenera previously identified using plumage characters. However, our genetic data, when considered in combination with phenotypic data, appear to be at odds with the current classification of some species of Chaetura. We recommend that C. viridipennis, currently generally treated as specifically distinct from C. chapmani, be returned to its former status as C. chapmani viridipennis, and that C. andrei, now generally regarded as synonymous with C. vauxi aphanes, again be recognized as a valid species. Widespread Neotropical species C. spinicaudus is paraphyletic with respect to more range-restricted species C. fumosa, C. egregia, and C. martinica. Geographically structured genetic variation within some other species of Chaetura, especially notable in C. cinereiventris, suggests that future study may lead to recognition of additional species in this genus. Biogeographic analysis indicated that Chaetura originated in South America and identified several dispersal events to Middle and North America following the formation of the Isthmus of Panama.}, }
@article {pmid30011013, year = {2018}, author = {Hood, WR and Zhang, Y and Mowry, AV and Hyatt, HW and Kavazis, AN}, title = {Life History Trade-offs within the Context of Mitochondrial Hormesis.}, journal = {Integrative and comparative biology}, volume = {58}, number = {3}, pages = {567-577}, pmid = {30011013}, issn = {1557-7023}, support = {R03 HD083654/HD/NICHD NIH HHS/United States ; }, mesh = {Biological Evolution ; Hormesis/*physiology ; *Life History Traits ; Longevity/*physiology ; Mitochondria/*physiology ; Oxidative Stress/physiology ; Reactive Oxygen Species/metabolism ; Reproduction/*physiology ; }, abstract = {Evolutionary biologists have been interested in the negative interactions among life history traits for nearly a century, but the mechanisms that would create this negative interaction remain poorly understood. One variable that has emerged as a likely link between reproductive effort and longevity is oxidative stress. Specifically, it has been proposed that reproduction generates free radicals that cause oxidative stress and, in turn, oxidative stress damages cellular components and accelerates senescence. We propose that there is limited support for the hypothesis because reactive oxygen species (ROS), the free radicals implicated in oxidative damage, are not consistently harmful. With this review, we define the hormetic response of mitochondria to ROS, termed mitochondrial hormesis, and describe how to test for a mitohormetic response. We interpret existing data using our model and propose that experimental manipulations will further improve our knowledge of this response. Finally, we postulate how the mitohormetic response curve applies to variation in animal performance and longevity.}, }
@article {pmid30003876, year = {2018}, author = {Katane, M and Ariyoshi, M and Tateishi, S and Koiwai, S and Takaku, K and Nagai, K and Nakayama, K and Saitoh, Y and Miyamoto, T and Sekine, M and Mita, M and Hamase, K and Matoba, S and Homma, H}, title = {Structural and enzymatic properties of mammalian d-glutamate cyclase.}, journal = {Archives of biochemistry and biophysics}, volume = {654}, number = {}, pages = {10-18}, doi = {10.1016/j.abb.2018.07.005}, pmid = {30003876}, issn = {1096-0384}, abstract = {d-Glutamate cyclase (DGLUCY) is a unique enzyme that reversibly converts free d-glutamate to 5-oxo-d-proline and H2O. Mammalian DGLUCY is highly expressed in the mitochondrial matrix in the heart, and its downregulation disrupts d-glutamate and/or 5-oxo-d-proline levels, contributing to the onset and/or exacerbation of heart failure. However, detailed characterisation of DGLUCY has not yet been performed. Herein, the structural and enzymatic properties of purified recombinant mouse DGLUCY were examined. The results revealed a dimeric oligomerisation state, and both d-glutamate-to-5-oxo-d-proline and 5-oxo-d-proline-to-d-glutamate reactions were catalysed in a stereospecific manner. Catalytic activity is modulated by divalent cations and nucleotides including ATP and ADP. Interestingly, the presence of Mn2+ completely abolished the 5-oxo-d-proline-to-d-glutamate reaction but stimulated the d-glutamate-to-5-oxo-d-proline reaction. The optimum pH is ∼8.0, similar to that in the mitochondrial matrix, and the catalytic efficiency for d-glutamate is markedly higher than that for 5-oxo-d-proline. These findings suggest that DGLUCY functions as a metalloenzyme that degrades d-glutamate in the mitochondrial matrix in mammalian cells. The results also provide insight into the correlation between DGLUCY enzyme activity and the physiological and pathological roles of d-glutamate and 5-oxo-d-proline in cardiac function, which is of relevance to the risk of onset of heart failure.}, }
@article {pmid29992378, year = {2018}, author = {Kasperski, A and Kasperska, R}, title = {Bioenergetics of life, disease and death phenomena.}, journal = {Theory in biosciences = Theorie in den Biowissenschaften}, volume = {137}, number = {2}, pages = {155-168}, pmid = {29992378}, issn = {1611-7530}, abstract = {In this article, some new aspects of unified cell bioenergetics are presented. From the perspective of unified cell bioenergetics certain subsequent stages of cancer development, from initiation stage, through transformation to metastasis, are analyzed. Here we show that after transformation, cancer cells are permanently exposed to reactive oxygen species, that causes continual random DNA mutations and as a result genome and chromosomal destabilizations. The modern cancer attractor hypothesis has been extended in explaining cancer development. Discussion is conducted in light of current cancerogenesis research, including bioenergetic cancer initiation, the somatic mutation theory and the tissue organization field theory. In the article reasons complicating the discovery of patterns of cancer genome changes and cancer evolution are presented. In addition certain cancer therapeutic aspects are given attention to.}, }
@article {pmid29989670, year = {2018}, author = {Iha, C and Grassa, CJ and Lyra, GM and Davis, CC and Verbruggen, H and Oliveira, MC}, title = {Organellar genomics: a useful tool to study evolutionary relationships and molecular evolution in Gracilariaceae (Rhodophyta).}, journal = {Journal of phycology}, volume = {54}, number = {6}, pages = {775-787}, doi = {10.1111/jpy.12765}, pmid = {29989670}, issn = {1529-8817}, support = {152939/2014-8//CNPq/ ; 301491/2013-5//CNPq/ ; 406351/2016-3//CNPq/ ; 88881.134422/2016-01//CAPES/ ; TO INT0001/2016//FAPESB/ ; 2013/11833-3//Biota-FAPESP/ ; 2015/50078-1//FAPESP/ ; }, abstract = {Gracilariaceae has a worldwide distribution including numerous economically important species. We applied high-throughput sequencing to obtain organellar genomes (mitochondria and chloroplast) from 10 species of Gracilariaceae and, combined with published genomes, to infer phylogenies and compare genome architecture among species representing main lineages. We obtained similar topologies between chloroplast and mitochondrial genomes phylogenies. However, the chloroplast phylogeny was better resolved with full support. In this phylogeny, Melanthalia intermedia is sister to a monophyletic clade including Gracilaria and Gracilariopsis, which were both resolved as monophyletic genera. Mitochondrial and chloroplast genomes were highly conserved in gene synteny, and variation mainly occurred in regions where insertions of plasmid-derived sequences (PDS) were found. In mitochondrial genomes, PDS insertions were observed in two regions where the transcription direction changes: between the genes cob and trnL, and trnA and trnN. In chloroplast genomes, PDS insertions were in different positions, but generally found between psdD and rrs genes. Gracilariaceae is a good model system to study the impact of PDS in genome evolution due to the frequent presence of these insertions in organellar genomes. Furthermore, the bacterial leuC/leuD operon was found in chloroplast genomes of Gracilaria tenuistipitata, G. chilensis, and M. intermedia, and in extrachromosomal plasmid of G. vermiculophylla. Phylogenetic trees show two different origins of leuC/leuD: genes found in chloroplast and plasmid were placed with proteobacteria, and genes encoded in the nucleus were close to Viridiplantae and cyanobacteria.}, }
@article {pmid29987715, year = {2018}, author = {Rolland, N and Bouchnak, I and Moyet, L and Salvi, D and Kuntz, M}, title = {The Main Functions of Plastids.}, journal = {Methods in molecular biology (Clifton, N.J.)}, volume = {1829}, number = {}, pages = {73-85}, doi = {10.1007/978-1-4939-8654-5_5}, pmid = {29987715}, issn = {1940-6029}, mesh = {Biological Evolution ; Energy Metabolism ; Plastids/*physiology/ultrastructure ; }, abstract = {Plastids are semiautonomous organelles like mitochondria, and derive from a cyanobacterial ancestor that was engulfed by a host cell. During evolution, they have recruited proteins originating from the nuclear genome, and only parts of their ancestral metabolic properties were conserved and optimized to limit functional redundancy with other cell compartments. Furthermore, large disparities in metabolic functions exist among various types of plastids, and the characterization of their various metabolic properties is far from being accomplished. In this review, we provide an overview of the main functions, known to be achieved by plastids or shared by plastids and other compartments of the cell. In short, plastids appear at the heart of all main plant functions.}, }
@article {pmid29987711, year = {2018}, author = {Maréchal, E}, title = {Primary Endosymbiosis: Emergence of the Primary Chloroplast and the Chromatophore, Two Independent Events.}, journal = {Methods in molecular biology (Clifton, N.J.)}, volume = {1829}, number = {}, pages = {3-16}, doi = {10.1007/978-1-4939-8654-5_1}, pmid = {29987711}, issn = {1940-6029}, mesh = {Alphaproteobacteria/genetics ; Cell Membrane/metabolism ; Chlamydia/genetics/metabolism ; Chloroplasts/*pathology ; Chromatophores/*physiology ; Cyanobacteria/metabolism ; Eukaryota/physiology ; Gene Transfer, Horizontal ; Genes, Bacterial ; Glaucophyta/genetics/metabolism ; Inheritance Patterns ; Mitochondria/genetics/metabolism ; Rhizaria ; *Symbiosis ; }, abstract = {The emergence of semiautonomous organelles, such as the mitochondrion, the chloroplast, and more recently, the chromatophore, are critical steps in the evolution of eukaryotes. They resulted from primary endosymbiotic events that seem to share general features, i.e., an acquisition of a bacterium/cyanobacteria likely via a phagocytic membrane, a genome reduction coinciding with an escape of genes from the organelle to the nucleus, and finally the appearance of an active system translocating nuclear-encoded proteins back to the organelles. An intense mobilization of foreign genes of bacterial origin, via horizontal gene transfers, plays a critical role. Some third partners, like Chlamydia, might have facilitated the transition from cyanobacteria to the early chloroplast. This chapter describes our current understanding of primary endosymbiosis, with a specific focus on primary chloroplasts considered to have emerged more than one billion years ago, and on the chromatophore, having emerged about one hundred million years ago.}, }
@article {pmid29986214, year = {2018}, author = {Angers, B and Chapdelaine, V and Deremiens, L and Vergilino, R and Leung, C and Doucet, SL and Glémet, H and Angers, A}, title = {Gene flow prevents mitonuclear co-adaptation: A comparative portrait of sympatric wild types and cybrids in the fish Chrosomus eos.}, journal = {Comparative biochemistry and physiology. Part D, Genomics &amp; proteomics}, volume = {27}, number = {}, pages = {77-84}, doi = {10.1016/j.cbd.2018.06.007}, pmid = {29986214}, issn = {1878-0407}, mesh = {Animals ; Cell Nucleus/genetics ; Cyprinidae/*genetics ; DNA, Mitochondrial/*genetics ; Epigenesis, Genetic ; Female ; *Gene Flow ; Genetic Speciation ; Male ; Mitochondria/genetics ; Sympatry ; }, abstract = {Allospecific mtDNA can occasionally be beneficial for the fitness of populations. It is, however, difficult to assess the effect of mtDNA in natural conditions due to genetic and/or environmental interactions. In the fish Chrosomus eos, the transfer of C. neogaeus mitochondria occurs in a single generation and results in natural cybrids. For a few lakes in Quebec, C. eos can harbor either a C. eos mtDNA (wild types) or a C. neogaeus mtDNA (cybrids). Moreover, mtDNA of cybrids originated either from Mississippian or Atlantic glacial refuges. Such diversity provides a useful system for in situ assessment of allospecific mtDNA effects. We determined genetic, epigenetic and transcriptomic variation as well as mitochondrial enzymatic activity (complex IV) changes among wild types and cybrids either in sympatry or allopatry. Wild types and cybrids did not segregate spatially within a lake. Moreover, no significant genetic differentiation was detected among wild types and cybrids indicating sustained gene flow. Mitochondrial complex IV activity was higher for cybrids in both sympatry and allopatry while no difference was detected among cybrid haplotypes. Epigenetic and transcriptomic analyses revealed only subtle differences between sympatric wild types and cybrids compared to differences between sites. Altogether, these results indicate a limited influence of allospecific mtDNA in nuclear gene expression when controlling for genetic and environmental effects. The absence of a reproductive barrier between wild types and cybrids results in random association of either C. eos or C. neogaeus mtDNA with C. eos nDNA at each generation, and prevents mitonuclear co-adaptation in sympatry.}, }
@article {pmid29984192, year = {2018}, author = {MacDonald, JA and Fowle, WH and Shin, E and Woods, DC}, title = {A method for freeze-fracture and scanning electron microscopy of isolated mitochondria.}, journal = {MethodsX}, volume = {5}, number = {}, pages = {593-598}, pmid = {29984192}, issn = {2215-0161}, abstract = {Electron microscopy as a methodology for the study of mitochondria based on morphological features is a standard technique that has experienced little evolution over the course of several decades. This technology has identified heterogeneity of mitochondria populations across both whole tissues, as well between individual cells, using primarily ultrathin sections for transmission electron microscopy (TEM). However, this technique constrains the evaluation of a sample to a single two-dimensional plane. To overcome this limitation, scanning electron microscopy (SEM) has been successfully utilized to observe three-dimensional mitochondria structures within the complex microenvironment containing total cellular components. In response to these dual technical caveats of existing electron microscopy protocols, we developed a methodology to evaluate the three-dimensional ultrastructure of isolated mitochondria, utilizing a freeze-fracture step and rigorous preservation of sample morphology. This protocol allows for a more high-throughput analysis of mitochondria populations from a specimen of interest, as the sample has been previously purified, as well as a finer resolution of complex intra-mitochondrial structures, using the depth of field created by SEM. •Protocol designed for SEM of isolated mitochondria samples.•SEM visualizes mitochondria ultrastructure in 3-D.•Freeze-fracture creates cross-sectional plane for view of interior organelle structures.}, }
@article {pmid29976842, year = {2018}, author = {He, K and Chen, X and Chen, P and He, SW and Cheng, F and Jiang, XL and Campbell, K}, title = {A new genus of Asiatic short-tailed shrew (Soricidae, Eulipotyphla) based on molecular and morphological comparisons.}, journal = {Zoological research}, volume = {39}, number = {5}, pages = {321-334}, pmid = {29976842}, issn = {2095-8137}, mesh = {Animals ; Biological Evolution ; China ; Mitochondria/genetics ; North America ; Sequence Analysis, DNA ; Shrews/*anatomy &amp; histology/classification/genetics ; Skull/anatomy &amp; histology ; }, abstract = {Blarinellini is a tribe of soricine shrews comprised of nine fossil genera and one extant genus. Blarinelline shrews were once widely distributed throughout Eurasia and North America, though only members of the Asiatic short-tailed shrew genus Blarinella currently persist (mostly in southwestern China and adjacent areas). Only three forms of Blarinella have been recognized as either species or subspecies. However, recent molecular studies indicated a strikingly deep divergence within the genus, implying the existence of a distinct genus-level lineage. We sequenced the complete mitochondrial genomes and one nuclear gene of three Asiatic short-tailed and two North American shrews and analyzed them morphometrically and morphologically. Our molecular analyses revealed that specimens ascribed to B. griselda formed two deeply diverged lineages, one a close relative to B. quadraticauda, whereas the other - comprised of topotype specimens from southern Gansu - diverged from other Blarinella in the middle Miocene (ca. 18.2 million years ago (Ma), 95% confidence interval=13.4-23.6 Ma). Although the skulls were similarly shaped in both lineages, we observed several diagnostic characteristics, including the shape of the upper P4. In consideration of the molecular and morphological evidence, we recognize B. griselda as the sole species of a new genus, namely, Pantherina gen. nov. Interestingly, some characteristics of Pantherina griselda are more similar to fossil genera, suggesting it represents an evolutionarily more primitive form than Blarinella. Recognition of this new genus sheds light on the systematics and evolutionary history of the tribe Blarinellini throughout Eurasia and North America.}, }
@article {pmid29973152, year = {2018}, author = {Vanhove, MPM and Briscoe, AG and Jorissen, MWP and Littlewood, DTJ and Huyse, T}, title = {The first next-generation sequencing approach to the mitochondrial phylogeny of African monogenean parasites (Platyhelminthes: Gyrodactylidae and Dactylogyridae).}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {520}, pmid = {29973152}, issn = {1471-2164}, support = {BR/132/PI/TILAPIA//Federaal Wetenschapsbeleid/ ; GB-TAF-2984//SYNTHESYS/ ; GB-TAF-4940//SYNTHESYS/ ; ZRDC2014MP084//Vlaamse Interuniversitaire Raad/ ; P505/12/G112 (ECIP)//Grantová Agentura České Republiky/ ; K220314N//Fonds Wetenschappelijk Onderzoek/ ; Mbisa Congo project//Belgian Development Cooperation/ ; BOF Reserve Fellowship//Universiteit Hasselt/ ; }, mesh = {Animals ; Cichlids/*parasitology ; DNA, Protozoan/chemistry/isolation &amp; purification/metabolism ; Gene Order ; Genome, Mitochondrial ; High-Throughput Nucleotide Sequencing ; Mitochondria/classification/*genetics ; Phylogeny ; Platyhelminths/*genetics ; Protozoan Proteins/classification/genetics ; RNA, Ribosomal/classification/genetics ; Sequence Analysis, DNA ; }, abstract = {BACKGROUND: Monogenean flatworms are the main ectoparasites of fishes. Representatives of the species-rich families Gyrodactylidae and Dactylogyridae, especially those infecting cichlid fishes and clariid catfishes, are important parasites in African aquaculture, even more so due to the massive anthropogenic translocation of their hosts worldwide. Several questions on their evolution, such as the phylogenetic position of Macrogyrodactylus and the highly speciose Gyrodactylus, remain unresolved with available molecular markers. Also, diagnostics and population-level research would benefit from the development of higher-resolution genetic markers. We aim to offer genetic resources for work on African monogeneans by providing mitogenomic data of four species (two belonging to Gyrodactylidae, two to Dactylogyridae), and analysing their gene sequences and gene order from a phylogenetic perspective.<br><br>RESULTS: Using Illumina technology, the first four mitochondrial genomes of African monogeneans were assembled and annotated for the cichlid parasites Gyrodactylus nyanzae, Cichlidogyrus halli, Cichlidogyrus mbirizei (near-complete mitogenome) and the catfish parasite Macrogyrodactylus karibae (near-complete mitogenome). Complete nuclear ribosomal operons were also retrieved, as molecular vouchers. The start codon TTG is new for Gyrodactylus and for Dactylogyridae, as is the incomplete stop codon TA for Dactylogyridae. Especially the nad2 gene is promising for primer development. Gene order was identical for protein-coding genes and differed between the African representatives of these families only in a tRNA gene transposition. A mitochondrial phylogeny based on an alignment of nearly 12,500 bp including 12 protein-coding and two ribosomal RNA genes confirms that the Neotropical oviparous Aglaiogyrodactylus forficulatus takes a sister group position with respect to the other gyrodactylids, instead of the supposedly 'primitive' African Macrogyrodactylus. Inclusion of the African Gyrodactylus nyanzae confirms the paraphyly of Gyrodactylus. The position of the African dactylogyrid Cichlidogyrus is unresolved, although gene order suggests it is closely related to marine ancyrocephalines.<br><br>CONCLUSIONS: The amount of mitogenomic data available for gyrodactylids and dactylogyrids is increased by roughly one-third. Our study underscores the potential of mitochondrial genes and gene order in flatworm phylogenetics, and of next-generation sequencing for marker development for these non-model helminths for which few primers are available.}, }
@article {pmid29970001, year = {2018}, author = {Lenz, H and Hein, A and Knoop, V}, title = {Plant organelle RNA editing and its specificity factors: enhancements of analyses and new database features in PREPACT 3.0.}, journal = {BMC bioinformatics}, volume = {19}, number = {1}, pages = {255}, pmid = {29970001}, issn = {1471-2105}, mesh = {Computational Biology/*methods ; Plant Proteins/*genetics ; RNA Editing/*genetics ; RNA, Plant/*genetics ; }, abstract = {BACKGROUND: Gene expression in plant chloroplasts and mitochondria is affected by RNA editing. Numerous C-to-U conversions, accompanied by reverse U-to-C exchanges in some plant clades, alter the genetic information encoded in the organelle genomes. Predicting and analyzing RNA editing, which ranges from only few sites in some species to thousands in other taxa, is bioinformatically demanding.<br><br>RESULTS: Here, we present major enhancements and extensions of PREPACT, a WWW-based service for analysing, predicting and cataloguing plant-type RNA editing. New features in PREPACT's core include direct GenBank accession query input and options to restrict searches to candidate U-to-C editing or to sites where editing has been documented previously in the references. The reference database has been extended by 20 new organelle editomes. PREPACT 3.0 features new modules &quot;EdiFacts&quot; and &quot;TargetScan&quot;. EdiFacts integrates information on pentatricopeptide repeat (PPR) proteins characterized as site-specific RNA editing factors. PREPACT's editome references connect into EdiFacts, linking editing events to specific co-factors where known. TargetScan allows position-weighted querying for sequence motifs in the organelle references, optionally restricted to coding regions or sequences around editing sites, or in queries uploaded by the user. TargetScan is mainly intended to evaluate and further refine the proposed PPR-RNA recognition code but may be handy for other tasks as well. We present an analysis for the immediate sequence environment of more than 15,000 documented editing sites finding strong and different bias in the editome data sets.<br><br>CONCLUSIONS: We exemplarily present the novel features of PREPACT 3.0 aimed to enhance the analyses of plant-type RNA editing, including its new modules EdiFacts integrating information on characterized editing factors and TargetScan aimed to analyse RNA editing site recognition specificities.}, }
@article {pmid29967381, year = {2018}, author = {Pietras, Z and Wojcik, MA and Borowski, LS and Szewczyk, M and Kulinski, TM and Cysewski, D and Stepien, PP and Dziembowski, A and Szczesny, RJ}, title = {Dedicated surveillance mechanism controls G-quadruplex forming non-coding RNAs in human mitochondria.}, journal = {Nature communications}, volume = {9}, number = {1}, pages = {2558}, pmid = {29967381}, issn = {2041-1723}, support = {UMO-2014/12/W/NZ1/00463 to RJS//Narodowe Centrum Nauki (National Science Centre)/International ; UMO-2014/13/D/NZ2/01114 to RJS//Narodowe Centrum Nauki (National Science Centre)/International ; UMO-2013/11/13/NZ1/00089 to PPS//Narodowe Centrum Nauki (National Science Centre)/International ; 309419 PAPs &amp; PUPs to AD//EC | European Research Council (ERC)/International ; }, mesh = {Animals ; DEAD-box RNA Helicases/metabolism ; Endoribonucleases/metabolism ; Exoribonucleases/genetics/metabolism ; *G-Quadruplexes ; Genome, Mitochondrial/*genetics ; HEK293 Cells ; HeLa Cells ; Humans ; Mitochondria/genetics/*metabolism ; Multienzyme Complexes/metabolism ; Phylogeny ; Poly(A)-Binding Proteins/genetics/*metabolism ; Polyribonucleotide Nucleotidyltransferase/metabolism ; RNA Helicases/metabolism ; RNA, Small Interfering/metabolism ; RNA, Untranslated/genetics/*metabolism ; }, abstract = {The GC skew in vertebrate mitochondrial genomes results in synthesis of RNAs that are prone to form G-quadruplexes (G4s). Such RNAs, although mostly non-coding, are transcribed at high rates and are degraded by an unknown mechanism. Here we describe a dedicated mechanism of degradation of G4-containing RNAs, which is based on cooperation between mitochondrial degradosome and quasi-RNA recognition motif (qRRM) protein GRSF1. This cooperation prevents accumulation of G4-containing transcripts in human mitochondria. In vitro reconstitution experiments show that GRSF1 promotes G4 melting that facilitates degradosome-mediated decay. Among degradosome and GRSF1 regulated transcripts we identified one that undergoes post-transcriptional modification. We show that GRSF1 proteins form a distinct qRRM group found only in vertebrates. The appearance of GRSF1 coincided with changes in the mitochondrial genome, which allows the emergence of G4-containing RNAs. We propose that GRSF1 appearance is an evolutionary adaptation enabling control of G4 RNA.}, }
@article {pmid29959984, year = {2018}, author = {Uribe, JE and Zardoya, R and Puillandre, N}, title = {Phylogenetic relationships of the conoidean snails (Gastropoda: Caenogastropoda) based on mitochondrial genomes.}, journal = {Molecular phylogenetics and evolution}, volume = {127}, number = {}, pages = {898-906}, doi = {10.1016/j.ympev.2018.06.037}, pmid = {29959984}, issn = {1095-9513}, mesh = {Animals ; Base Sequence ; Gene Order ; *Genome, Mitochondrial ; Mitochondria/genetics ; Open Reading Frames/genetics ; *Phylogeny ; Snails/*genetics ; }, abstract = {With more than 5,000 species, Conoidea is one of the most diversified superfamilies of Gastropoda. Recently, the family-level classification of these venomous predator snails has undergone substantial changes, on the basis of a phylogenetic tree reconstructed combining partial mitochondrial and nuclear gene sequences, and up to 16 families are now recognized. However, phylogenetic relationships among these families remain largely unresolved. Here, we sequenced 20 complete or nearly complete mitochondrial (mt) genomes, which were combined with mt genomes available in GenBank to construct a dataset that included representatives of 80% of the known families, although for some we had only one species or genus as representative. Most of the sequenced conoidean mt genomes shared a constant genome organization, and observed rearrangements were limited exclusively to tRNA genes in a few lineages. Phylogenetic trees were reconstructed using probabilistic methods. Two main monophyletic groups, termed &quot;Clade A&quot; and &quot;Clade B&quot;, were recovered with strong support within a monophyletic Conoidea. Clade A (including families Clavatulidae, Horaiclavidae, Turridae s.s., Terebridae, Drilliidae, Pseudomelatomidae, and Cochlespiridae) was composed of four main lineages, one of which was additionally supported by a rearrangement in the gene order. Clade B (including families Conidae, Borsoniidae, Clathurellidae, Mangeliidae, Raphitomidae, and Mitromorphidae) was composed of five main lineages. The reconstructed phylogeny rejected the monophyly of Clavatulidae, Horaiclavidae, Turridae, Pseudomelatomidae, and Conidae, indicating that several of the currently accepted families may be ill-defined. The reconstructed tree also revealed new phylogenetic positions for genera characterized as tentative (Gemmuloborsonia, Lucerapex, and Leucosyrinx), enigmatic (Marshallena) or challenging to place (Fusiturris), which will potentially impact the classification of the Conoidea.}, }
@article {pmid29955026, year = {2018}, author = {Liu, SY and He, K and Chen, SD and Jin, W and Murphy, RW and Tang, MK and Liao, R and Li, FJ}, title = {How many species of Apodemus and Rattus occur in China? A survey based on mitochondrial cyt b and morphological analyses.}, journal = {Zoological research}, volume = {39}, number = {5}, pages = {309-320}, pmid = {29955026}, issn = {2095-8137}, mesh = {Animals ; China ; Cytochromes b/*genetics ; Mitochondria/*genetics ; Murinae/anatomy &amp; histology/*genetics ; Phylogeny ; Rats/anatomy &amp; histology/*genetics ; Skull/anatomy &amp; histology ; Surveys and Questionnaires ; Tooth/anatomy &amp; histology ; }, abstract = {Apodemus (mice) and Rattus (rats) are the top rodent reservoirs for zoonoses in China, yet little is known about their diversity. We reexamined the alpha diversity of these two genera based on a new collection of specimens from China and their cyt b sequences in GenBank. We also tested whether species could be identified using external and craniodental measurements exclusively. Measurements from 147 specimens of Apodemus and 236 specimens of Rattus were used for morphological comparisons. We analysed 74 cyt b sequences of Apodemus and 100 cyt b sequences of Rattus to facilitate phylogenetic estimations. Results demonstrated that nine species of Apodemus and seven species of Rattus, plus a new subspecies of Rattus nitidus, are distributed in China. Principal component analysis using external and craniodental measurements revealed that measurements alone could not separate the recognized species. The occurrence of Rattus pyctoris in China remains uncertain.}, }
@article {pmid29953866, year = {2018}, author = {Woodling, NS and Partridge, L}, title = {Parkinson's Disease: Mitochondria Parked at the ER Hit the Snooze Button.}, journal = {Neuron}, volume = {98}, number = {6}, pages = {1059-1061}, doi = {10.1016/j.neuron.2018.06.025}, pmid = {29953866}, issn = {1097-4199}, abstract = {Parkinson's disease patients report sleep disturbances well ahead of motor symptoms. In this issue of Neuron, Valadas et al. (2018) report that the disease genes pink1 and parkin exert novel, cell-type-specific effects to modulate ER-mitochondria contacts, neuropeptidergic transmission, and sleep patterns.}, }
@article {pmid29950599, year = {2018}, author = {Burgstaller, JP and Kolbe, T and Havlicek, V and Hembach, S and Poulton, J and Piálek, J and Steinborn, R and Rülicke, T and Brem, G and Jones, NS and Johnston, IG}, title = {Large-scale genetic analysis reveals mammalian mtDNA heteroplasmy dynamics and variance increase through lifetimes and generations.}, journal = {Nature communications}, volume = {9}, number = {1}, pages = {2488}, doi = {10.1038/s41467-018-04797-2}, pmid = {29950599}, issn = {2041-1723}, support = {MR/J013617/1//Medical Research Council/United Kingdom ; }, mesh = {Age Factors ; Animals ; DNA Copy Number Variations/*genetics ; DNA, Mitochondrial/*genetics ; Datasets as Topic ; Female ; Genome, Mitochondrial/*genetics ; Haplotypes/genetics ; Mice ; Mice, Inbred C57BL ; Mitochondria/metabolism ; Models, Animal ; Oocytes/cytology/immunology ; }, abstract = {Vital mitochondrial DNA (mtDNA) populations exist in cells and may consist of heteroplasmic mixtures of mtDNA types. The evolution of these heteroplasmic populations through development, ageing, and generations is central to genetic diseases, but is poorly understood in mammals. Here we dissect these population dynamics using a dataset of unprecedented size and temporal span, comprising 1947 single-cell oocyte and 899 somatic measurements of heteroplasmy change throughout lifetimes and generations in two genetically distinct mouse models. We provide a novel and detailed quantitative characterisation of the linear increase in heteroplasmy variance throughout mammalian life courses in oocytes and pups. We find that differences in mean heteroplasmy are induced between generations, and the heteroplasmy of germline and somatic precursors diverge early in development, with a haplotype-specific direction of segregation. We develop stochastic theory predicting the implications of these dynamics for ageing and disease manifestation and discuss its application to human mtDNA dynamics.}, }
@article {pmid29950419, year = {2018}, author = {Bilz, NC and Jahn, K and Lorenz, M and Lüdtke, A and Hübschen, JM and Geyer, H and Mankertz, A and Hübner, D and Liebert, UG and Claus, C}, title = {Rubella Viruses Shift Cellular Bioenergetics to a More Oxidative and Glycolytic Phenotype with a Strain-Specific Requirement for Glutamine.}, journal = {Journal of virology}, volume = {92}, number = {17}, pages = {}, pmid = {29950419}, issn = {1098-5514}, mesh = {A549 Cells ; Endothelial Cells/metabolism/virology ; *Energy Metabolism ; Glucose/metabolism/pharmacology ; Glutamine/*metabolism/pharmacology ; Glycolysis/*drug effects ; Homeostasis ; Humans ; Kynurenine/metabolism ; Metabolic Networks and Pathways/drug effects ; Mitochondria/metabolism ; Nucleotides/biosynthesis ; Oxidation-Reduction ; Oxidative Stress ; Oxygen Consumption/drug effects/*physiology ; Phenotype ; Pyruvic Acid/metabolism/pharmacology ; Rubella virus/*metabolism ; Virus Replication/drug effects ; }, abstract = {The flexible regulation of cellular metabolic pathways enables cellular adaptation to changes in energy demand under conditions of stress such as posed by a virus infection. To analyze such an impact on cellular metabolism, rubella virus (RV) was used in this study. RV replication under selected substrate supplementation with glucose, pyruvate, and glutamine as essential nutrients for mammalian cells revealed its requirement for glutamine. The assessment of the mitochondrial respiratory (based on the oxygen consumption rate) and glycolytic (based on the extracellular acidification rate) rate and capacity by respective stress tests through Seahorse technology enabled determination of the bioenergetic phenotype of RV-infected cells. Irrespective of the cellular metabolic background, RV infection induced a shift of the bioenergetic state of epithelial cells (Vero and A549) and human umbilical vein endothelial cells to a higher oxidative and glycolytic level. Interestingly there was a RV strain-specific, but genotype-independent demand for glutamine to induce a significant increase in metabolic activity. While glutaminolysis appeared to be rather negligible for RV replication, glutamine could serve as donor of its amide nitrogen in biosynthesis pathways for important metabolites. This study suggests that the capacity of RVs to induce metabolic alterations could evolve differently during natural infection. Thus, changes in cellular bioenergetics represent an important component of virus-host interactions and could complement our understanding of the viral preference for a distinct host cell population.IMPORTANCE RV pathologies, especially during embryonal development, could be connected with its impact on mitochondrial metabolism. With bioenergetic phenotyping we pursued a rather novel approach in virology. For the first time it was shown that a virus infection could shift the bioenergetics of its infected host cell to a higher energetic state. Notably, the capacity to induce such alterations varied among different RV isolates. Thus, our data add viral adaptation of cellular metabolic activity to its specific needs as a novel aspect to virus-host evolution. In addition, this study emphasizes the implementation of different viral strains in the study of virus-host interactions and the use of bioenergetic phenotyping of infected cells as a biomarker for virus-induced pathological alterations.}, }
@article {pmid29949077, year = {2018}, author = {Lu, Y and Liu, N and Xu, L and Fang, J and Wang, S}, title = {The complete mitochondrial genome of Vanessa indica and phylogenetic analyses of the family Nymphalidae.}, journal = {Genes &amp; genomics}, volume = {40}, number = {10}, pages = {1011-1022}, pmid = {29949077}, issn = {2092-9293}, support = {J10118516034//Undergraduate student scientific research innovation projects of Anhui university/International ; }, mesh = {Animals ; Base Composition ; Butterflies/*classification/cytology/genetics ; Evolution, Molecular ; Genome Size ; *Genome, Mitochondrial ; Mitochondria/*genetics ; Nucleic Acid Conformation ; Phylogeny ; RNA, Ribosomal/chemistry ; RNA, Ribosomal, 16S/chemistry ; RNA, Transfer/chemistry ; Sequence Analysis, DNA/*methods ; }, abstract = {Vanessa indica is a small butterfly lacking historical molecular and biological research. Vanessa indica belongs to the family Nymphalidae (Lepidoptera: Papilionoidea), which is the largest group of butterflies and are nearly ubiquitous. However, after more than a century of taxonomic and molecular studies, there is no consensus for family classification, and the phylogenetic relationships within Nymphalidae are controversial. The first objective was to sequence and characterize the complete mitochondrial genome of V. indica. The most important objective was to completely reconstruct the phylogenetic relationships for family members within Nymphalidae. The mitochondrial genomic DNA (mtDNA) of V. indica was extracted and amplified by polymerase chain reaction. The complete mitochondrial sequence was annotated and characterized by analyzing sequences with SeqMan program. The phylogenetic analyses were conducted on thirteen protein coding genes (PCGs) in 95 mtDNA of Nymphalidae downloaded from GenBank for reference using the maximum likelihood method and Bayesian inference to ensure the validity of the results. The complete mitogenome was a circular molecule with 15,191 bp consisting of 13 protein coding genes, two ribosomal RNA genes (16S rRNA and 12S rRNA), 22 transfer RNA (tRNA) genes, and an A + T-rich region (D-loop). The nucleotide composition of the genome was highly biased for A + T content, which accounts for 80.0% of the nucleotides. All the tRNAs have putative secondary structures that are characteristic of mitochondrial tRNAs, except tRNASer(AGN). All the PCGs started with ATN codons, except cytochrome c oxidase subunit 1 (COX1), which was found to start with an unusual CGA codon. Four genes were observed to have unusual codons: COX1 terminated with atypical TT and the other three genes terminated with a single T. The A + T rich region of 327 bp consisted of repetitive sequences, including a ATAGA motif, a 19-bp poly-T stretch, and two microsatellite-like regions (TA)8. The phylogenetic analyses consistently placed Biblidinae as a sister cluster to Heliconiinae and Calinaginae as a sister clade to Satyrinae. Moreover, the phylogenetic tree identified Libytheinae as a monophyletic group within Nymphalidae. The complete mitogenome of V. indica was 15,191 bp with mitochondrial characterizations common for lepidopteran species, which enriched the mitochondria data of Nymphalid species. And the phylogenetic analysis revealed different classifications and relationships than those previously described. Our results are significant because they would be useful in further understanding of the evolutionary biology of Nymphalidae.}, }
@article {pmid29949074, year = {2018}, author = {Zhang, R and Wang, X}, title = {Characterization and phylogenetic analysis of the complete mitogenome of a rare cavefish, Sinocyclocheilus multipunctatus (Cypriniformes: Cyprinidae).}, journal = {Genes &amp; genomics}, volume = {40}, number = {10}, pages = {1033-1040}, pmid = {29949074}, issn = {2092-9293}, mesh = {Animals ; Base Composition ; Contig Mapping ; Cyprinidae/*genetics ; Genome Size ; *Genome, Mitochondrial ; Mitochondria/*genetics ; Molecular Sequence Annotation ; Phylogeny ; Sequence Analysis, DNA/*methods ; }, abstract = {The genus Sinocyclocheilus is a representative group of cave creatures. However, genetic studies on Sinocyclocheilus are rare. The primary objective of this study was to explore the structure and feature of the complete mitochondrial genome of S. multipunctatus, and reconstruct the mitogenomic phylogeny of Sinocyclocheilus. The mitochondrial DNA of S. multipunctatus was amplified by overlapping PCR fragments. The mitogenome was assembled by the SeqMan and annotated using MitoAnnotator. The phylogenetic tree was established using the Bayesian inference and Maximum likelihood methods. The mitogenome of S. multipunctatus is a typical circular molecule of 16,586 bp with base composition A (31.25%), T (25.90%), G (16.35%), and C (26.50%), and consists of 13 protein-coding genes (PCGs), 22 transfer RNAs (tRNAs) genes, two ribosomal RNAs, and a 931 bp control region. Phylogenetic analysis reveals two clades in the Sinocyclocheilus with robust support. S. multipunctatus is close to a newly discovered cavefish, S. ronganensis. We obtained and described the complete mitogenome of S. multipunctatus, and investigated its phylogenetic status, which may provide a valuable resource for future phylogenetic analyses and population genetic studies in Sinocyclocheilus.}, }
@article {pmid29948488, year = {2018}, author = {Yoshida, Y}, title = {The cellular machineries responsible for the division of endosymbiotic organelles.}, journal = {Journal of plant research}, volume = {131}, number = {5}, pages = {727-734}, pmid = {29948488}, issn = {1618-0860}, support = {Career Development Award/CDA00049/2018-C//Human Frontier Science Program/ ; KAKENHI/JP18K06325//Japan Society for the Promotion of Science/ ; }, mesh = {Cell Division ; Chloroplasts/physiology/ultrastructure ; Mitochondria/physiology/ultrastructure ; Organelles/physiology/*ultrastructure ; Plastids/physiology/ultrastructure ; Rhodophyta/physiology/*ultrastructure ; *Symbiosis ; }, abstract = {Chloroplasts (plastids) and mitochondria evolved from endosymbiotic bacteria. These organelles perform vital functions in photosynthetic eukaryotes, such as harvesting and converting energy for use in biological processes. Consistent with their evolutionary origins, plastids and mitochondria proliferate by the binary fission of pre-existing organelles. Here, I review the structures and functions of the supramolecular machineries driving plastid and mitochondrial division, which were discovered and first studied in the primitive red alga Cyanidioschyzon merolae. In the past decade, intact division machineries have been isolated from plastids and mitochondria and examined to investigate their underlying structure and molecular mechanisms. A series of studies has elucidated how these division machineries assemble and transform during the fission of these organelles, and which of the component proteins generate the motive force for their contraction. Plastid- and mitochondrial-division machineries have important similarities in their structures and mechanisms despite sharing no component proteins, implying that these division machineries evolved in parallel. The establishment of these division machineries might have enabled the host eukaryotic ancestor to permanently retain these endosymbiotic organelles by regulating their binary fission and the equal distribution of resources to daughter cells. These findings provide key insights into the establishment of endosymbiotic organelles and have opened new avenues of research into their evolution and mechanisms of proliferation.}, }
@article {pmid29948332, year = {2018}, author = {van der Sluis, R}, title = {Analyses of the genetic diversity and protein expression variation of the acyl: CoA medium-chain ligases, ACSM2A and ACSM2B.}, journal = {Molecular genetics and genomics : MGG}, volume = {293}, number = {5}, pages = {1279-1292}, pmid = {29948332}, issn = {1617-4623}, support = {Self-Initiated research grant//South African Medical Research Council/ ; 99323//National Research Foundation/ ; }, mesh = {Coenzyme A Ligases/*genetics/metabolism ; *Genetic Variation ; Glycine/metabolism ; *Haplotypes ; Humans ; Mitochondria, Liver/*enzymology ; Phylogeny ; Substrate Specificity ; Xenobiotics/*metabolism ; }, abstract = {Benzoate (found in milk and widely used as preservative), salicylate (present in fruits and the active component of aspirin), dietary polyphenols produced by gut microbiota, metabolites from organic acidemias, and medium-chain fatty acids (MCFAs) are all metabolised/detoxified by the glycine conjugation pathway. Xenobiotics are first activated to an acyl-CoA by the mitochondrial xenobiotic/medium-chain fatty acid: CoA ligases (ACSMs) and subsequently conjugated to glycine by glycine N-acyltransferase (GLYAT). The MCFAs are activated to acyl-CoA by the ACSMs before entering mitochondrial β-oxidation. This two-step enzymatic pathway has, however, not been thoroughly investigated and the biggest gap in the literature remains the fact that studies continuously characterise the pathway as a one-step reaction. There are no studies available on the interaction/competition of the various substrates involved in the pathway, whilst very little research has been done on the ACSM ligases. To identify variants/haplotypes that should be characterised in future detoxification association studies, this study assessed the naturally observed sequence diversity and protein expression variation of ACSM2A and ACSM2B. The allelic variation, haplotype diversity, Tajima's D values, and phylogenetic analyses indicated that ACSM2A and ACSM2B are highly conserved. This confirmed an earlier hypothesis that the glycine conjugation pathway is highly conserved and essential for life as it maintains the CoA and glycine homeostasis in the liver mitochondria. The protein expression analyses showed that ACSM2A is the predominant transcript in liver. Future studies should investigate the effect of the variants identified in this study on the substrate specificity of these proteins.}, }
@article {pmid29946965, year = {2018}, author = {Sharma, M and Bennewitz, B and Klösgen, RB}, title = {Rather rule than exception? How to evaluate the relevance of dual protein targeting to mitochondria and chloroplasts.}, journal = {Photosynthesis research}, volume = {138}, number = {3}, pages = {335-343}, pmid = {29946965}, issn = {1573-5079}, mesh = {Biological Assay ; Biological Evolution ; Chloroplasts/*metabolism ; Mitochondria/*metabolism ; Protein Transport ; Symbiosis ; }, abstract = {Dual targeting of a nuclearly encoded protein into two different cell organelles is an exceptional event in eukaryotic cells. Yet, the frequency of such dual targeting is remarkably high in case of mitochondria and chloroplasts, the two endosymbiotic organelles of plant cells. In most instances, it is mediated by &quot;ambiguous&quot; transit peptides, which recognize both organelles as the target. A number of different approaches including in silico, in organello as well as both transient and stable in vivo assays are established to determine the targeting specificity of such transit peptides. In this review, we will describe and compare these approaches and discuss the potential role of this unusual targeting process. Furthermore, we will present a hypothetical scenario how dual targeting might have arisen during evolution.}, }
@article {pmid29945721, year = {2018}, author = {Barshad, G and Marom, S and Cohen, T and Mishmar, D}, title = {Mitochondrial DNA Transcription and Its Regulation: An Evolutionary Perspective.}, journal = {Trends in genetics : TIG}, volume = {34}, number = {9}, pages = {682-692}, doi = {10.1016/j.tig.2018.05.009}, pmid = {29945721}, issn = {0168-9525}, abstract = {The bacterial heritage of mitochondria, as well as its independent genome [mitochondrial DNA (mtDNA)] and polycistronic transcripts, led to the view that mitochondrial transcriptional regulation relies on an evolutionarily conserved, prokaryotic-like system that is separated from the rest of the cell. Indeed, mtDNA transcription was previously thought to be governed by a few dedicated direct regulators, namely, the mitochondrial RNA polymerase (POLRMT), two transcription factors (TFAM and TF2BM), one transcription elongation (TEFM), and one known transcription termination factor (mTERF1). Recent findings have, however, revealed that known nuclear gene expression regulators are also involved in mtDNA transcription and have identified novel transcriptional features consistent with adaptation of the mitochondria to the regulatory environment of the precursor of the eukaryotic cell. Finally, whereas mammals follow the human mtDNA transcription pattern, other organisms notably diverge in terms of mtDNA transcriptional regulation. Hence, mtDNA transcriptional regulation is likely more evolutionary diverse than once thought.}, }
@article {pmid29945248, year = {2018}, author = {Bize, P and Lowe, I and Lehto Hürlimann, M and Heckel, G}, title = {Effects of the Mitochondrial and Nuclear Genomes on Nonshivering Thermogenesis in a Wild Derived Rodent.}, journal = {Integrative and comparative biology}, volume = {58}, number = {3}, pages = {532-543}, doi = {10.1093/icb/icy072}, pmid = {29945248}, issn = {1557-7023}, mesh = {Adipose Tissue, Brown/*physiology ; Animals ; Arvicolinae/classification/genetics/*physiology ; Cell Nucleus/genetics ; Female ; Genome/*physiology ; Genome, Mitochondrial/physiology ; Male ; Thermogenesis/*genetics ; }, abstract = {A key adaptation of mammals to their environment is their ability to maintain a constant high body temperature, even at rest, under a wide range of ambient temperatures. In cold climates, this is achieved by an adaptive production of endogenous heat, known as nonshivering thermogenesis (NST), in the brown adipose tissue (BAT). This organ, unique to mammals, contains a very high density of mitochondria, and BAT correct functioning relies on the correct functioning of its mitochondria. Mitochondria enclose proteins encoded both in the maternally inherited mitochondrial genome and in the biparentally inherited nuclear genome, and one overlooked hypothesis is that both genomes and their interaction may shape NST. By housing under standardized conditions wild-derived common voles (Microtus arvalis) from two distinct evolutionary lineages (Western [W] and Central [C]), we show that W voles had greater NST than C voles. By introgressing those two lineages over at least nine generations, we then experimentally tested the influence of the nuclear and mitochondrial genomes on NST and related phenotypic traits. We found that between-lineage variation in NST and BAT size were significantly influenced by the mitochondrial and nuclear genomes, respectively, with the W mitochondrial genotype being associated with higher NST and the W nuclear genotype with a larger BAT. There were significant mito-nuclear interactions on whole animal body weight and resting metabolic rate (RMR). Hybrid voles were lighter and had higher RMR. Overall, our findings turn new light on the influence of the mitochondrial and nuclear genomes on thermogenesis and building adaptation to the environment in mammals.}, }
@article {pmid29945242, year = {2018}, author = {Buchanan, JL and Meiklejohn, CD and Montooth, KL}, title = {Mitochondrial Dysfunction and Infection Generate Immunity-Fecundity Tradeoffs in Drosophila.}, journal = {Integrative and comparative biology}, volume = {58}, number = {3}, pages = {591-603}, pmid = {29945242}, issn = {1557-7023}, support = {R01 GM067862/GM/NIGMS NIH HHS/United States ; }, mesh = {Animals ; Drosophila melanogaster/genetics/*physiology ; Drosophila simulans/genetics/*physiology ; Female ; Fertility ; *Genotype ; Hybridization, Genetic ; Immunity, Innate ; *Life History Traits ; Male ; Mitochondria/*physiology ; Nutritional Status ; Oxidative Phosphorylation ; Stress, Physiological ; }, abstract = {Physiological responses to short-term environmental stressors, such as infection, can have long-term consequences for fitness, particularly if the responses are inappropriate or nutrient resources are limited. Genetic variation affecting energy acquisition, storage, and usage can limit cellular energy availability and may influence resource-allocation tradeoffs even when environmental nutrients are plentiful. Here, we utilized Drosophila mitochondrial-nuclear genotypes to test whether disrupted mitochondrial function interferes with nutrient-sensing pathways, and whether this disruption has consequences for tradeoffs between immunity and fecundity. We found that an energetically-compromised genotype was relatively resistant to rapamycin-a drug that targets nutrient-sensing pathways and mimics resource limitation. Dietary resource limitation decreased survival of energetically-compromised flies. Furthermore, survival of infection with a natural pathogen was decreased in this genotype, and females of this genotype experienced immunity-fecundity tradeoffs that were not evident in genotypic controls with normal energy metabolism. Together, these results suggest that this genotype may have little excess energetic capacity and fewer cellular nutrients, even when environmental nutrients are not limiting. Genetic variation in energy metabolism may therefore act to limit the resources available for allocation to life-history traits in ways that generate tradeoffs even when environmental resources are not limiting.}, }
@article {pmid29944924, year = {2018}, author = {Chakrabarty, S and Kabekkodu, SP and Singh, RP and Thangaraj, K and Singh, KK and Satyamoorthy, K}, title = {Mitochondria in health and disease.}, journal = {Mitochondrion}, volume = {43}, number = {}, pages = {25-29}, doi = {10.1016/j.mito.2018.06.006}, pmid = {29944924}, issn = {1872-8278}, mesh = {Animals ; Biomedical Research/*trends ; Disease Models, Animal ; Humans ; India ; Mitochondria/*physiology ; Mitochondrial Diseases/diagnosis/*pathology/*physiopathology/therapy ; }, abstract = {Mitochondrial biology has become an area of intense research owing to the unique physiology of the organelle and its role in several types of cancers and other disorders. It has been found that mitochondria-encoded proteins, mitochondrial DNA and even RNA influence the functioning of the cell in more ways than were previously imagined. This may contribute to disease phenotypes which require detailed investigation and communication to the community health care providers. Additionally, this provides several novel avenues in drug designing against various cancers, neurodegenerative diseases and other metabolic disorders. The sixth annual conference of the Society for Mitochondrial Research and Medicine - India (SMRM) titled, 'Mitochondria in Health and Disease' was organized by Rana P. Singh at the School of Life Sciences, Jawaharlal Nehru University in New Delhi, India from 10th to 11th February 2017. The underlying objective of the conference was to provide a platform to discuss the recent advances in basic and translational research in mitochondrial biology and diseases. The conference aimed to translate academic research into clinical practice by providing a forum for basic researchers and clinicians to share their knowledge and build collaborations towards development of advanced therapeutic in mitochondrial diseases. To facilitate the knowledge-sharing, six major themes for the scientific sessions were (1) understanding of mitochondrial biology in disease progression, (2) advances in basic and translational mitochondrial research, (3) mitochondria in evolution and development, (4) targeting mitochondria for cancer prevention and treatment, (5) mitochondria in metabolic and neurological disorders and (6) mitochondria in stem cell and regeneration biology. This report summarizes the major outcomes of the discussions at the conference.}, }
@article {pmid29940392, year = {2018}, author = {Wang, Q and Lu, W and Yang, J and Jiang, L and Zhang, Q and Kan, X and Yang, X}, title = {Comparative transcriptomics in three Passerida species provides insights into the evolution of avian mitochondrial complex I.}, journal = {Comparative biochemistry and physiology. Part D, Genomics &amp; proteomics}, volume = {28}, number = {}, pages = {27-36}, doi = {10.1016/j.cbd.2018.06.002}, pmid = {29940392}, issn = {1878-0407}, abstract = {Recent studies have shown that mitochondria play a crucial role in cellular energy production through the oxidative phosphorylation (OXPHOS) system. Complex I (NADH:ubiquinone oxidoreductase), the first and largest enzyme complex of the OXPHOS system, includes both nuclear- and mitochondrial-encoded proteins. However, the patterns of natural selection and phylogenetic implications of complex I in birds still remain unclear. In this study, we combined transcriptomic and phylogenetic analyses to comprehensively determine the evolution of avian complex I. The transcriptomes of three Passerida species (Leiothrix lutea, Spodiopsar sericeus, and Passer montanus) were obtained using the Illumina HiSeq™ 2500 system. More than 192,000,000 clean reads were assembled in a total of 828,267 transcripts. Evolutionary selection analysis suggested that six genes of the core subunits in avian complex I may have undergone putative positive selection. Notably, we found that the mean dN/dS (ω) ratio for mitochondrial genes of core subunits was significantly lower than that for nuclear genes of non-core subunits within complex I. The constructed maximum-parsimony, maximum-likelihood, and Bayesian inference phylogenetic trees were based on 44 complex I genes. We verified that the family Paridae (represented by Parus major and Pseudopodoces humilis) was clustered with Musicicapoidea. Our results provide new insights into the evolution of avian mitochondrial complex I.}, }
@article {pmid29934612, year = {2018}, author = {Lajbner, Z and Pnini, R and Camus, MF and Miller, J and Dowling, DK}, title = {Experimental evidence that thermal selection shapes mitochondrial genome evolution.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {9500}, pmid = {29934612}, issn = {2045-2322}, abstract = {Mitochondria are essential organelles, found within eukaryotic cells, which contain their own DNA. Mitochondrial DNA (mtDNA) has traditionally been used in population genetic and biogeographic studies as a maternally-inherited and evolutionary-neutral genetic marker. However, it is now clear that polymorphisms within the mtDNA sequence are routinely non-neutral, and furthermore several studies have suggested that such mtDNA polymorphisms are also sensitive to thermal selection. These observations led to the formulation of the &quot;mitochondrial climatic adaptation&quot; hypothesis, for which all published evidence to date is correlational. Here, we use laboratory-based experimental evolution in the fruit fly, Drosophila melanogaster, to test whether thermal selection can shift population frequencies of two mtDNA haplogroups whose natural frequencies exhibit clinal associations with latitude along the Australian east-coast. We present experimental evidence that the thermal regime in which the laboratory populations were maintained drove changes in haplogroup frequencies across generations. Our results strengthen the emerging view that intra-specific mtDNA variants are sensitive to selection, and suggest spatial distributions of mtDNA variants in natural populations of metazoans might reflect adaptation to climatic environments rather than within-population coalescence and diffusion of selectively-neutral haplotypes across populations.}, }
@article {pmid29923829, year = {2018}, author = {Vitali, DG and Käser, S and Kolb, A and Dimmer, KS and Schneider, A and Rapaport, D}, title = {Independent evolution of functionally exchangeable mitochondrial outer membrane import complexes.}, journal = {eLife}, volume = {7}, number = {}, pages = {}, pmid = {29923829}, issn = {2050-084X}, support = {ITN TAMPting, 607072//Marie Curie/United Kingdom ; }, mesh = {Biological Coevolution ; Gene Deletion ; *Gene Expression Regulation, Fungal ; Genetic Complementation Test ; Membrane Proteins/*genetics/metabolism ; Mitochondria/genetics/metabolism ; Mitochondrial Membrane Transport Proteins/*genetics/metabolism ; Mitochondrial Membranes/*metabolism ; Organelle Biogenesis ; Phosphorylation ; Protein Isoforms/genetics/metabolism ; Protozoan Proteins/*genetics/metabolism ; Saccharomyces cerevisiae/*genetics/metabolism ; Saccharomyces cerevisiae Proteins/*genetics/metabolism ; Trypanosoma brucei brucei/*genetics/metabolism ; }, abstract = {Assembly and/or insertion of a subset of mitochondrial outer membrane (MOM) proteins, including subunits of the main MOM translocase, require the fungi-specific Mim1/Mim2 complex. So far it was unclear which proteins accomplish this task in other eukaryotes. Here, we show by reciprocal complementation that the MOM protein pATOM36 of trypanosomes is a functional analogue of yeast Mim1/Mim2 complex, even though these proteins show neither sequence nor topological similarity. Expression of pATOM36 rescues almost all growth, mitochondrial biogenesis, and morphology defects in yeast cells lacking Mim1 and/or Mim2. Conversely, co-expression of Mim1 and Mim2 restores the assembly and/or insertion defects of MOM proteins in trypanosomes ablated for pATOM36. Mim1/Mim2 and pATOM36 form native-like complexes when heterologously expressed, indicating that additional proteins are not part of these structures. Our findings indicate that Mim1/Mim2 and pATOM36 are the products of convergent evolution and arose only after the ancestors of fungi and trypanosomatids diverged.}, }
@article {pmid29923828, year = {2018}, author = {Tokatlidis, K}, title = {Shaping the import system of mitochondria.}, journal = {eLife}, volume = {7}, number = {}, pages = {}, pmid = {29923828}, issn = {2050-084X}, mesh = {*Mitochondria ; *Mitochondrial Membranes ; }, abstract = {Evidence is accumulating that unrelated species have independently evolved the same way of importing proteins in their mitochondria.}, }
@article {pmid29916730, year = {2018}, author = {Chang, CH and Dai, WY and Chen, TY and Lee, AH and Hou, HY and Liu, SH and Jang-Liaw, NH}, title = {DNA barcoding reveals CITES-listed species among Taiwanese government-seized chelonian specimens.}, journal = {Genome}, volume = {61}, number = {8}, pages = {615-624}, doi = {10.1139/gen-2017-0264}, pmid = {29916730}, issn = {1480-3321}, mesh = {Animals ; *DNA Barcoding, Taxonomic ; Electron Transport Complex IV/*genetics ; Genetic Markers ; Government ; Mitochondria/*genetics ; Phylogeny ; Species Specificity ; Taiwan ; Turtles/classification/*genetics ; }, abstract = {Compared to traditional morphological identification, DNA barcoding-molecular identification based on sequencing of a segment of mitochondrial cytochrome c oxidase subunit I (COI)-provides a shortcut to authenticating chelonian identifications. Here, we selected 63 government-seized chelonian specimens deposited at Taipei Zoo for DNA barcoding analysis. DNA barcoding and subsequent phylogenetic analysis successfully authenticated 36 chelonian species, including five that are listed in CITES Appendix I. Approximately 90% (57/63) of the specimens were successfully authenticated by our molecular approach, but lack or error of BOLD reference sequences, biological processes such as hybridization, and uncertain species delimitation all reduced the accuracy of DNA barcoding. To increase the accuracy of DNA barcoding, Taipei Zoo will continue to enrich the BOLD database and also establish a genetic database, to include additional genetic markers, by using government-seized chelonian specimens. A fast and accurate method to authenticate seized samples could assist law enforcement agencies to prosecute criminals and restrict illegal exploitation of wild chelonian resources.}, }
@article {pmid29913250, year = {2018}, author = {Seligmann, H}, title = {Giant viruses as protein-coated amoeban mitochondria?.}, journal = {Virus research}, volume = {253}, number = {}, pages = {77-86}, doi = {10.1016/j.virusres.2018.06.004}, pmid = {29913250}, issn = {1872-7492}, mesh = {Acanthamoeba/genetics/metabolism/*virology ; *Biological Evolution ; Gene Order ; Genome Size ; Genome, Viral ; Giant Viruses/*genetics/physiology ; Mitochondria/genetics/metabolism/*virology ; Phylogeny ; Protozoan Proteins/genetics/*metabolism ; }, abstract = {Mimivirus' genome includes parts of 5S, 16S and 23S ribosomal RNAs encoded by Acanthamoeba's mitogenome, the giant virus' host. Two non-exclusive hypotheses for rRNA remnants in giant viruses are examined: 1. mitogenomes invade viral genomes as they do for nuclear chromosomes (producing numts); 2. megaviral genomes evolved from an ancestral mitogenome. Alignment analyses confirm mitochondrial, rather than alphaproteobacterial origins of megaviral rRNAs. Other mitogenes have likely megaviral homologues. These megaviral homologues coevolve to much larger extents than candidate rRNA homologues, suggesting rRNA decay in viruses. Megaviral mitogene homologues overall follow mitochondrial gene order, suggesting mitogenome ancestry. Ancestral synteny decreases with megaviral genome size, suggesting that subsequent mitogene insertions blur ancestral gene order. Putative defenses against DNA invasion conserve mitogene order in short megaviral genomes. Synteny between mitogenome and megaviral genomes confirms the RNA/DNA polymerase-homologies-based hypothesis that giant viruses have mitochondrial-like ancestors, viral rRNA remnants are corollary of mitogenomic origins of megaviral genomes. Note that giant viruses, mitochondria and bacterial spores all have double membranes, spores and viruses have protein coats. Mitochondria might occasionally form spore-like structures that drifted into megaviruses. These missing links could confirm mitogenome ancestry of giant viruses rather than giant virus ancestry of mitochondria.}, }
@article {pmid29913080, year = {2018}, author = {Wilkerson, CD and Mahoney, SP and Carr, SM}, title = {Post-glacial recolonization of insular Newfoundland across the Strait of Belle Isle gave rise to an endemic subspecies of woodland caribou, Rangifer tarandus terranovae (Bangs, 1896): evidence from mtDNA haplotypes.}, journal = {Genome}, volume = {61}, number = {8}, pages = {575-585}, doi = {10.1139/gen-2017-0199}, pmid = {29913080}, issn = {1480-3321}, mesh = {Animals ; DNA, Mitochondrial/*genetics ; Forests ; *Genetic Speciation ; Haplotypes/genetics ; Microsatellite Repeats/*genetics ; Mitochondria/genetics ; Newfoundland and Labrador ; Reindeer/*genetics ; }, abstract = {Post-glacial origins of woodland caribou (Rangifer tarandus subsp.) on the island of Newfoundland and their relationship to mainland populations have been uncertain. Sequence analysis of 2223 bp of the mitochondrial DNA control region and cytochrome b gene from 233 Newfoundland caribou identified 32 haplotypes in four major clades. Comparison with other Nearctic caribou confirms a closer affinity of the basal Clade A with animals from the mainland, and as an outgroup to Clades B, C, and D that are endemic to the island. This indicates re-entry of caribou to post-glacial Newfoundland across the Strait of Belle Isle from Labrador, rather than from southern coastal refugia. Newfoundland caribou are a distinct subspecies, Rangifer tarandus terranovae (Bangs, 1896). Hierarchical AMOVA shows significant clinal differentiation of the major clades from northwest to southeast across the island. The isolated Avalon Peninsula population in the extreme southeast is genetically depauperate. Founder effects are evident in herds introduced to previously unoccupied areas by wildlife managers over the past 40-50 years. Reindeer introduced in the early 20th century have not contributed to mtDNA diversity in Newfoundland caribou.}, }
@article {pmid29909242, year = {2018}, author = {Pinheiro, GMS and Ramos, CHI}, title = {Initial characterization of newly identified mitochondrial and chloroplast small HSPs from sugarcane shows that these chaperones have different oligomerization states and substrate specificities.}, journal = {Plant physiology and biochemistry : PPB}, volume = {129}, number = {}, pages = {285-294}, doi = {10.1016/j.plaphy.2018.06.002}, pmid = {29909242}, issn = {1873-2690}, mesh = {Chloroplasts/*metabolism ; Chromatography, Gel ; Cloning, Molecular ; Heat-Shock Proteins/chemistry/genetics/isolation &amp; purification/*metabolism ; Mitochondria/*metabolism ; Phylogeny ; Plant Proteins/chemistry/genetics/isolation &amp; purification/*metabolism ; Saccharum/genetics/*metabolism ; Sequence Alignment ; Spectrometry, Fluorescence ; Substrate Specificity ; }, abstract = {Chaperones belonging to the small heat shock protein (sHSP) family are ubiquitous and exhibit elevated expression under stresses conditions to protect proteins against aggregation, thereby contributing to the stress tolerance of the organism. Tropical plants are constantly exposed to high temperatures, and the mechanisms by which these plants tolerate heat stress are of foremost importance to basic science as well as applied agrobiotechnology. Therefore, this study aims to characterize sHSPs from different organelles from sugarcane, an important crop that is associated with sugar and bioenergy production. An expression sequence tag database of sugarcane was searched, and sHsp genes of mitochondrial and chloroplast organelles were selected and cloned. The proteins were expressed in Escherichia coli and isolated and purified by two chromatographic steps with high purity as single species. Circular dichroism and fluorescence spectroscopy showed that both proteins were purified in their folded states with a predominant β-sheet secondary structure. Determination of the molecular weight, diffusion coefficient and Stokes radius parameters showed that both chaperones form large spherical-like oligomers in solution. The two sHSPs had different oligomeric states and substrate specificities. The mitochondrial sHSP was a 20-mer with ability to protect model substrates that differ from that of the 16-meric sHSP from chloroplasts. These results indicate that both sHSPs are key agents to protect against stress confirming the importance of the great diversity of sHSP chaperones in plants for homeostasis maintenance. Moreover, to our knowledge, this is the first report about small HSPs from sugarcane organelles.}, }
@article {pmid29904051, year = {2018}, author = {Chen, N and Cai, Y and Chen, Q and Li, R and Wang, K and Huang, Y and Hu, S and Huang, S and Zhang, H and Zheng, Z and Song, W and Ma, Z and Ma, Y and Dang, R and Zhang, Z and Xu, L and Jia, Y and Liu, S and Yue, X and Deng, W and Zhang, X and Sun, Z and Lan, X and Han, J and Chen, H and Bradley, DG and Jiang, Y and Lei, C}, title = {Whole-genome resequencing reveals world-wide ancestry and adaptive introgression events of domesticated cattle in East Asia.}, journal = {Nature communications}, volume = {9}, number = {1}, pages = {2337}, pmid = {29904051}, issn = {2041-1723}, support = {31501918//National Natural Science Foundation of China (National Science Foundation of China)/International ; }, mesh = {Animals ; *Breeding ; Cattle/*genetics ; China ; Chromosomes/ultrastructure ; Domestication ; Female ; Genetic Variation ; *Genetics, Population ; *Genome ; Geography ; Haplotypes ; Male ; Mitochondria ; Models, Statistical ; Phylogeny ; Polymorphism, Single Nucleotide ; Species Specificity ; Tibet ; }, abstract = {Cattle domestication and the complex histories of East Asian cattle breeds warrant further investigation. Through analysing the genomes of 49 modern breeds and eight East Asian ancient samples, worldwide cattle are consistently classified into five continental groups based on Y-chromosome haplotypes and autosomal variants. We find that East Asian cattle populations are mainly composed of three distinct ancestries, including an earlier East Asian taurine ancestry that reached China at least ~3.9 kya, a later introduced Eurasian taurine ancestry, and a novel Chinese indicine ancestry that diverged from Indian indicine approximately 36.6-49.6 kya. We also report historic introgression events that helped domestic cattle from southern China and the Tibetan Plateau achieve rapid adaptation by acquiring ~2.93% and ~1.22% of their genomes from banteng and yak, respectively. Our findings provide new insights into the evolutionary history of cattle and the importance of introgression in adaptation of cattle to new environmental challenges in East Asia.}, }
@article {pmid29902489, year = {2018}, author = {Uzarska, MA and Przybyla-Toscano, J and Spantgar, F and Zannini, F and Lill, R and Mühlenhoff, U and Rouhier, N}, title = {Conserved functions of Arabidopsis mitochondrial late-acting maturation factors in the trafficking of iron‑sulfur clusters.}, journal = {Biochimica et biophysica acta. Molecular cell research}, volume = {1865}, number = {9}, pages = {1250-1259}, doi = {10.1016/j.bbamcr.2018.06.003}, pmid = {29902489}, issn = {0167-4889}, mesh = {Arabidopsis/genetics/*metabolism ; Arabidopsis Proteins/genetics/*metabolism ; Cloning, Molecular ; DNA-Binding Proteins/genetics/metabolism ; Evolution, Molecular ; Iron/metabolism ; Mitochondria/genetics/metabolism ; Mitochondrial Proteins/genetics/*metabolism ; Saccharomyces cerevisiae/genetics/*growth &amp; development ; Sulfur/metabolism ; }, abstract = {Numerous proteins require iron‑sulfur (Fe-S) clusters as cofactors for their function. Their biogenesis is a multi-step process occurring in the cytosol and mitochondria of all eukaryotes and additionally in plastids of photosynthetic eukaryotes. A basic model of Fe-S protein maturation in mitochondria has been obtained based on studies achieved in mammals and yeast, yet some molecular details, especially of the late steps, still require investigation. In particular, the late-acting biogenesis factors in plant mitochondria are poorly understood. In this study, we expressed the factors belonging to NFU, BOLA, SUFA/ISCA and IBA57 families in the respective yeast mutant strains. Expression of the Arabidopsis mitochondrial orthologs was usually sufficient to rescue the growth defects observed on specific media and/or to restore the abundance or activity of the defective Fe-S or lipoic acid-dependent enzymes. These data demonstrate that the plant mitochondrial counterparts, including duplicated isoforms, likely retained their ancestral functions. In contrast, the SUFA1 and IBA57.2 plastidial isoforms cannot rescue the lysine and glutamate auxotrophies of the respective isa1-isa2Δ and iba57Δ strains or of the isa1-isa2-iba57Δ triple mutant when expressed in combination. This suggests a specialization of the yeast mitochondrial and plant plastidial factors in these late steps of Fe-S protein biogenesis, possibly reflecting substrate-specific interactions in these different compartments.}, }
@article {pmid29902241, year = {2018}, author = {Yoshino, H and Yamaji, F and Ohsawa, TA}, title = {Genetic structure and dispersal patterns in Limnoria nagatai (Limnoriidae, Isopoda) dwelling in non-buoyant kelps, Eisenia bicyclis and E. arborea, in Japan.}, journal = {PloS one}, volume = {13}, number = {6}, pages = {e0198451}, pmid = {29902241}, issn = {1932-6203}, mesh = {Animals ; Demography ; Electron Transport Complex IV/*genetics ; Gene Flow ; Isopoda/*classification/physiology ; Japan ; Kelp/*classification/physiology ; Mitochondria/genetics ; Pacific Ocean ; Phylogeny ; Phylogeography ; Sequence Analysis, DNA/*methods ; }, abstract = {The marine isopod genus Limnoria contains algae-eating species. Previous phylogeographic studies have suggested that Limnoria species feeding on buoyant kelp underwent low genetic differentiation on a large spatial scale because rafting on floating host kelps promotes high levels of gene flow. In this paper, we survey the genetic structure of Limnoria nagatai, which bores into the non-buoyant kelps Eisenia bicyclis and E. arborea. We analyze the mitochondrial DNA (cytochrome oxidase subunit I [COI] gene) and morphological traits of L. nagatai, and the host kelps E. bicyclis and E. arborea from 14 populations along the Japanese archipelago of the Pacific Ocean and the Sea of Japan. Four major lineages are recognized within L. nagatai: three lineages in the Pacific Ocean, and one lineage in the Sea of Japan which might be a cryptic species. For L. nagatai, we show high genetic differentiation between geographically separated habitats in the Pacific Ocean, while low differentiation is found among continuous host kelps habitats in the Pacific Ocean as well as the Sea of Japan. L. nagatai in E. bicyclis in the Pacific Ocean has experienced large population expansion after the Last Glacial Maximum (LGM), whereas the lineage in E. bicyclis in the Sea of Japan has not. We suggest that Limnoria feeding on non-buoyant kelps, may attain low genetic differentiation because they might be able to disperse long distance if the habitat of host kelps is continuous. The historical events affecting Limnoria after the LGM may differ between the coasts of the Pacific Ocean and the Sea of Japan.}, }
@article {pmid29897900, year = {2018}, author = {Chadha, S and Vijayan, R and Gupta, S and Munde, M and Gourinath, S and Madhubala, R}, title = {Genetic manipulation of Leishmania donovani threonyl tRNA synthetase facilitates its exploration as a potential therapeutic target.}, journal = {PLoS neglected tropical diseases}, volume = {12}, number = {6}, pages = {e0006575}, pmid = {29897900}, issn = {1935-2735}, mesh = {Drug Delivery Systems ; Escherichia coli/enzymology/genetics ; Fatty Alcohols/pharmacology ; Gene Expression ; Humans ; Leishmania donovani/drug effects/*enzymology/genetics/pathogenicity ; Leishmaniasis, Visceral/*parasitology ; Organisms, Genetically Modified ; Phylogeny ; Protein Domains ; Protein Transport ; Protozoan Proteins/antagonists &amp; inhibitors/genetics/isolation &amp; purification/metabolism ; Recombinant Proteins ; Sequence Deletion ; Threonine-tRNA Ligase/antagonists &amp; inhibitors/*genetics/isolation &amp; purification/metabolism ; }, abstract = {BACKGROUND: Aminoacyl tRNA synthetases are central enzymes required for protein synthesis. These enzymes are the known drug targets in bacteria and fungi. Here, we for the first time report the functional characterization of threonyl tRNA synthetase (LdThrRS) of Leishmania donovani, a protozoan parasite, the primary causative agent of visceral leishmaniasis.<br><br>METHODOLOGY: Recombinant LdThrRS (rLdThrRS) was expressed in E. coli and purified. The kinetic parameters for rLdThrRS were determined. The subcellular localization of LdThrRS was done by immunofluorescence analysis. Heterozygous mutants of LdThrRS were generated in Leishmania promastigotes. These genetically manipulated parasites were checked for their proliferation, virulence, aminoacylation activity and sensitivity to the known ThrRS inhibitor, borrelidin. An in silico generated structural model of L. donovani ThrRS was compared to that of human.<br><br>CONCLUSIONS: Recombinant LdThrRS displayed aminoacylation activity, and the protein is possibly localized to both the cytosol and mitochondria. The comparison of the 3D-model of LdThrRS to human ThrRS displayed considerable similarity. Heterozygous parasites showed restrictive growth phenotype and had attenuated infectivity. These heterozygous parasites were more susceptible to inhibition by borrelidin. Several attempts to obtain ThrRS homozygous null mutants were not successful, indicating its essentiality for the Leishmania parasite. Borrelidin showed a strong affinity for LdThrRS (KD: 0.04 μM) and was effective in inhibiting the aminoacylation activity of the rLdThrRS (IC50: 0.06 μM). Borrelidin inhibited the promastigotes (IC50: 21 μM) stage of parasites. Our data shows that LdThrRS is essential for L. donovani survival and is likely to bind with small drug-like molecules with strong affinity, thus making it a potential target for drug discovery efforts.}, }
@article {pmid29892953, year = {2018}, author = {Liu, W and Hu, C and Xie, W and Chen, P and Zhang, Y and Yao, R and Li, K and Chang, Q}, title = {The mitochondrial genome of red-necked phalarope Phalaropus lobatus (Charadriiformes: Scolopacidae) and phylogeny analysis among Scolopacidae.}, journal = {Genes &amp; genomics}, volume = {40}, number = {5}, pages = {455-463}, pmid = {29892953}, issn = {2092-9293}, mesh = {Animals ; Base Composition/genetics ; Base Sequence/genetics ; Birds/genetics ; Charadriiformes/*genetics ; DNA, Mitochondrial/genetics ; Genome, Mitochondrial/*genetics ; Mitochondria/genetics ; Nucleic Acid Conformation ; Phylogeny ; RNA, Ribosomal/genetics ; RNA, Transfer/genetics ; Sequence Analysis, DNA ; }, abstract = {The red-necked phalarope is a wonderful species with specific morphological characters and lifestyles. Mitochondrial genomes, encoding necessary proteins involved in the system of energy metabolism, are important for the evolution and adaption of species. In this study, we determined the complete mitogenome sequence of Phalaropus lobatus (Charadriiformes: Scolopacidae). The circular genome is 16714 bp in size, containing 13 PCGs, two ribosomal RNAs and 22 tRNAs and a high AT-rich control region. The AT skew and GC skew of major strand is positive and negative respectively. Most of PCGs are biased towards A-rich except ND1. A codon usage analysis shows that 3 start codons (ATG, GTG and ATA), 4 stop codons (TAA, TAG, AGG, AGA) and two incomplete terminate codons (T-). Twenty two transfer RNAs have the typical cloverleaf structure, and a total of ten base pairs are mismatched throughout the nine tRNA genes. The phylogenetic tree based on 13 PCGs and 2 rRNA genes indicates that monophyly of the family and genus Phalaropus is close to genus Xenus plus Tringa. The analysis of selective pressure shows 13 protein-coding genes are evolving under the purifying selection and P. lobatus is different from other Scolopacidae species on the selective pressure of gene ND4. This study helps us know the inherent mechanism of mitochondrial structure and natural selection.}, }
@article {pmid29883862, year = {2018}, author = {Tyagi, A and Pramanik, R and Vishnubhatla, S and Ali, S and Bakhshi, R and Chopra, A and Singh, A and Bakhshi, S}, title = {Pattern of mitochondrial D-loop variations and their relation with mitochondrial encoded genes in pediatric acute myeloid leukemia.}, journal = {Mutation research}, volume = {810}, number = {}, pages = {13-18}, doi = {10.1016/j.mrfmmm.2018.05.002}, pmid = {29883862}, issn = {1873-135X}, mesh = {Adolescent ; Base Sequence ; Child ; Child, Preschool ; Cyclooxygenase 1/*genetics ; Cytochromes b/*genetics ; DNA, Mitochondrial/*genetics ; Electron Transport Complex I/*genetics ; Humans ; Infant ; Leukemia, Myeloid, Acute/*genetics ; Mitochondria/*genetics ; Mitochondrial Proton-Translocating ATPases/*genetics ; *Mutation Rate ; Prospective Studies ; Sequence Analysis, DNA ; }, abstract = {Role of mitochondrial DNA variations, particularly in D loop region, remains investigational in acute myeloid leukaemia (AML). Consecutive 151 pediatric AML patients were prospectively enrolled from June 2013 to August 2016, for evaluating pattern of variations in mitochondrial D-loop region and to determine their association, if any, with expression of mitochondrial-encoded genes. For each patient, D-loop region was sequenced on baseline bone marrow, buccal swab and mother's blood sample. Real time PCR was used for relative gene expression of four mitochondrial DNA encoded genes viz. Nicotinamide-adenine-dineucleotide-dehydrogenase subunit 3 (ND3), Cytochrome-B (Cyt-B), Cytochrome c oxidase-I (COX1) and ATP-synthetase F0 subunit-6 (ATP6). Total 1490 variations were found at 237 positions in D-Loop; 1206 (80.9%) were germline and 284 (19.1%) were somatic. Positions 73-263 were identified as a probable hotspot region. G bases appeared to be most stable nucleotide (least number of single base substitutions) whereas T appeared to be most susceptible to variations with germline T-C being the commonest. Gene expression of Cyt-B was found to be significantly higher for any variation (somatic or germline) at positions 16,192 and 16,327 while it was significantly lower for variations at positions 16,051 and 207. Any variation at positions 152, 207 and 513 significantly decreased COX1 expression while those at positions 16,051 and 152 attenuated ATP6 expression. This first study evaluated type and overall pattern of D-loop variations in AML, and also showed that some of these variations in D loop region might have an effect on the mitochondrial-encoded genes which is new and valuable information in AML genomics.}, }
@article {pmid29880721, year = {2018}, author = {Zhang, H and Burr, SP and Chinnery, PF}, title = {The mitochondrial DNA genetic bottleneck: inheritance and beyond.}, journal = {Essays in biochemistry}, volume = {62}, number = {3}, pages = {225-234}, doi = {10.1042/EBC20170096}, pmid = {29880721}, issn = {1744-1358}, support = {101876/Z/13/Z//Wellcome Trust/United Kingdom ; MC_UP_1501/2//Medical Research Council/United Kingdom ; G0601943//Medical Research Council/United Kingdom ; }, mesh = {Animals ; DNA, Mitochondrial/*genetics ; Gene-Environment Interaction ; Genetic Drift ; *Genetic Predisposition to Disease ; Humans ; Mitochondria/physiology ; Organelle Biogenesis ; Selection, Genetic ; }, abstract = {mtDNA is a multicopy genome. When mutations exist, they can affect a varying proportion of the mtDNA present within every cell (heteroplasmy). Heteroplasmic mtDNA mutations can be maternally inherited, but the proportion of mutated alleles differs markedly between offspring within one generation. This led to the genetic bottleneck hypothesis, explaining the rapid changes in allele frequency seen during transmission from one generation to the next. Although a physical reduction in mtDNA has been demonstrated in several species, a comprehensive understanding of the molecular mechanisms is yet to be revealed. Several questions remain, including the role of selection for and against specific alleles, whether all bottlenecks are the same, and precisely how the bottleneck is controlled during development. Although originally thought to be limited to the germline, there is evidence that bottlenecks exist in other cell types during development, perhaps explaining why different tissues in the same organism contain different levels of mutated mtDNA. Moreover, tissue-specific bottlenecks may occur throughout life in response to environmental influences, adding further complexity to the situation. Here we review key recent findings, and suggest ways forward that will hopefully advance our understanding of the role of mtDNA in human disease.}, }
@article {pmid29879897, year = {2018}, author = {Hein, A and Knoop, V}, title = {Expected and unexpected evolution of plant RNA editing factors CLB19, CRR28 and RARE1: retention of CLB19 despite a phylogenetically deep loss of its two known editing targets in Poaceae.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {85}, pmid = {29879897}, issn = {1471-2148}, mesh = {Arabidopsis/genetics ; Base Sequence ; Cell Nucleus/metabolism ; Chloroplasts/genetics ; *Evolution, Molecular ; Mitochondria/genetics ; *Phylogeny ; Plant Proteins/*genetics/metabolism ; Poaceae/*genetics ; RNA Editing/*genetics ; RNA, Messenger/genetics/metabolism ; RNA, Plant/*genetics/metabolism ; RNA-Binding Proteins/*genetics ; Species Specificity ; }, abstract = {BACKGROUND: C-to-U RNA editing in mitochondria and chloroplasts and the nuclear-encoded, RNA-binding PPR proteins acting as editing factors present a wide field of co-evolution between the different genetic systems in a plant cell. Recent studies on chloroplast editing factors RARE1 and CRR28 addressing one or two chloroplast editing sites, respectively, found them strictly conserved among 65 flowering plants as long as one of their RNA editing targets remained present.<br><br>RESULTS: Extending the earlier sampling to 117 angiosperms with high-quality genome or transcriptome data, we find more evidence confirming previous conclusions but now also identify cases for expected evolutionary transition states such as retention of RARE1 despite loss of its editing target or the degeneration of CRR28 truncating its carboxyterminal DYW domain. The extended angiosperm set was now used to explore CLB19, an &quot;E+&quot;-type PPR editing factor targeting two chloroplast editing sites, rpoAeU200SF and clpPeU559HY, in Arabidopsis thaliana. We found CLB19 consistently conserved if one of the two targets was retained and three independent losses of CLB19 after elimination of both targets. The Ericales show independent regains of the ancestrally lost clpPeU559HY editing, further explaining why multiple-target editing factors are lost much more rarely than single target factors like RARE1. The retention of CLB19 despite loss of both editing targets in some Ericaceae, Apocynaceae and in Camptotheca (Nyssaceae) likely represents evolutionary transitions. However, the retention of CLB19 after a phylogenetic deep loss in the Poaceae rather suggests a yet unrecognized further editing target, for which we suggest editing event ndhAeU473SL.<br><br>CONCLUSION: Extending the scope of studies on plant organelle RNA editing to further taxa and additional nuclear cofactors reveals expected evolutionary transitions, strikingly different evolutionary dynamics for multiple-target editing factors like CLB19 and CRR28 and suggests additional functions for editing factor CLB19 among the Poaceae.}, }
@article {pmid29875327, year = {2018}, author = {Bonsack, F and Sukumari-Ramesh, S}, title = {TSPO: An Evolutionarily Conserved Protein with Elusive Functions.}, journal = {International journal of molecular sciences}, volume = {19}, number = {6}, pages = {}, pmid = {29875327}, issn = {1422-0067}, mesh = {Animals ; Conserved Sequence ; Disease Susceptibility ; Evolution, Molecular ; Humans ; Ligands ; Mitochondria/genetics/metabolism ; Molecular Targeted Therapy ; Oxidative Stress ; Reactive Oxygen Species/metabolism ; Receptors, GABA/chemistry/*genetics/*metabolism ; Steroids/biosynthesis ; }, abstract = {TSPO (18 kDa translocator protein) was identified decades ago in a search for peripheral tissue binding sites for benzodiazepines, and was formerly called the peripheral benzodiazepine receptor. TSPO is a conserved protein throughout evolution and it is implicated in the regulation of many cellular processes, including inflammatory responses, oxidative stress, and mitochondrial homeostasis. TSPO, apart from its broad expression in peripheral tissues, is highly expressed in neuroinflammatory cells, such as activated microglia. In addition, emerging studies employing the ligands of TSPO suggest that TSPO plays an important role in neuropathological settings as a biomarker and therapeutic target. However, the precise molecular function of this protein in normal physiology and neuropathology remains enigmatic. This review provides an overview of recent advances in our understanding of this multifaceted molecule and identifies the knowledge gap in the field for future functional studies.}, }
@article {pmid29873740, year = {2018}, author = {Scott, GR and Guo, KH and Dawson, NJ}, title = {The Mitochondrial Basis for Adaptive Variation in Aerobic Performance in High-Altitude Deer Mice.}, journal = {Integrative and comparative biology}, volume = {58}, number = {3}, pages = {506-518}, doi = {10.1093/icb/icy056}, pmid = {29873740}, issn = {1557-7023}, mesh = {*Acclimatization ; *Altitude ; Animals ; Mitochondria/*physiology ; Peromyscus/*physiology ; }, abstract = {Mitochondria play a central role in aerobic performance. Studies aimed at elucidating how evolved variation in mitochondrial physiology contributes to adaptive variation in aerobic performance can therefore provide a unique and powerful lens to understanding the evolution of complex physiological traits. Here, we review our ongoing work on the importance of changes in mitochondrial quantity and quality to adaptive variation in aerobic performance in high-altitude deer mice. Whole-organism aerobic capacity in hypoxia (VO2max) increases in response to hypoxia acclimation in this species, but high-altitude populations have evolved consistently greater VO2max than populations from low altitude. The evolved increase in VO2max in highlanders is associated with an evolved increase in the respiratory capacity of the gastrocnemius muscle. This appears to result from highlanders having more mitochondria in this tissue, attributed to a higher proportional abundance of oxidative fiber-types and a greater mitochondrial volume density within oxidative fibers. The latter is primarily caused by an over-abundance of subsarcolemmal mitochondria in high-altitude mice, which is likely advantageous for mitochondrial O2 supply because more mitochondria are situated adjacent to the cell membrane and close to capillaries. Evolved changes in gastrocnemius phenotype appear to be underpinned by population differences in the expression of genes involved in energy metabolism, muscle development, and vascular development. Hypoxia acclimation has relatively little effect on respiratory capacity of the gastrocnemius, but it increases respiratory capacity of the diaphragm. However, the mechanisms responsible for this increase differ between populations: lowlanders appear to adjust mitochondrial quantity and quality (i.e., increases in citrate synthase [CS] activity, and mitochondrial respiration relative to CS activity) and they exhibit higher rates of mitochondrial release of reactive oxygen species, whereas highlanders only increase mitochondrial quantity in response to hypoxia acclimation. In contrast to the variation in skeletal muscles, the respiratory capacity of cardiac muscle does not appear to be affected by hypoxia acclimation and varies little between populations. Therefore, evolved changes in mitochondrial quantity and quality make important tissue-specific contributions to adaptive variation in aerobic performance in high-altitude deer mice.}, }
@article {pmid29870859, year = {2018}, author = {Bolstad, KSR and Braid, HE and Strugnell, JM and Lindgren, AR and Lischka, A and Kubodera, T and Laptikhovsky, VL and Roura Labiaga, A}, title = {A mitochondrial phylogeny of the family Onychoteuthidae (Cephalopoda: Oegopsida).}, journal = {Molecular phylogenetics and evolution}, volume = {128}, number = {}, pages = {88-97}, doi = {10.1016/j.ympev.2018.05.032}, pmid = {29870859}, issn = {1095-9513}, mesh = {Animals ; Cephalopoda/*classification/genetics ; DNA, Mitochondrial/genetics ; Electron Transport Complex IV/genetics ; Mitochondria/*genetics ; *Phylogeny ; Species Specificity ; }, abstract = {The oegopsid squid family Onychoteuthidae was recently revised based on morphology, but sufficient material for a complementary molecular analysis has not been available until now. In the present study, over 250 sequences of cytochrome c oxidase subunit I (COI) and 16S rRNA for 222 individuals were analysed to create a combined phylogeny for the family. Results support monophyly for the family and all seven onychoteuthid genera (including Moroteuthopsis, established herein as the senior genus name for species formerly attributed to Kondakovia); 29 genetically distinct species were recovered, with the BIN (Barcode Index Number) analysis for COI showing good congruence overall with morphological species groupings. No sequences were available for five additional known species, making the total family diversity likely to exceed 34 species. Seven of the BINs formed in this study appear to represent undescribed taxa, suggesting that even in this relatively well-studied family, much additional work remains before a comprehensive understanding of the diversity and evolutionary relationships for the Onychoteuthidae can be achieved.}, }
@article {pmid29857468, year = {2018}, author = {Avelange-Macherel, MH and Candat, A and Neveu, M and Tolleter, D and Macherel, D}, title = {Decoding the Divergent Subcellular Location of Two Highly Similar Paralogous LEA Proteins.}, journal = {International journal of molecular sciences}, volume = {19}, number = {6}, pages = {}, pmid = {29857468}, issn = {1422-0067}, mesh = {Amino Acid Sequence ; Arabidopsis/genetics/metabolism ; Mitochondrial Proteins/chemistry/genetics/metabolism ; Multigene Family ; Mutation ; Plant Proteins/chemistry/*genetics/*metabolism ; Protein Binding ; Protein Transport ; Proteolysis ; Structure-Activity Relationship ; }, abstract = {Many mitochondrial proteins are synthesized as precursors in the cytosol with an N-terminal mitochondrial targeting sequence (MTS) which is cleaved off upon import. Although much is known about import mechanisms and MTS structural features, the variability of MTS still hampers robust sub-cellular software predictions. Here, we took advantage of two paralogous late embryogenesis abundant proteins (LEA) from Arabidopsis with different subcellular locations to investigate structural determinants of mitochondrial import and gain insight into the evolution of the LEA genes. LEA38 and LEA2 are short proteins of the LEA_3 family, which are very similar along their whole sequence, but LEA38 is targeted to mitochondria while LEA2 is cytosolic. Differences in the N-terminal protein sequences were used to generate a series of mutated LEA2 which were expressed as GFP-fusion proteins in leaf protoplasts. By combining three types of mutation (substitution, charge inversion, and segment replacement), we were able to redirect the mutated LEA2 to mitochondria. Analysis of the effect of the mutations and determination of the LEA38 MTS cleavage site highlighted important structural features within and beyond the MTS. Overall, these results provide an explanation for the likely loss of mitochondrial location after duplication of the ancestral gene.}, }
@article {pmid29855375, year = {2018}, author = {Amzati, GS and Pelle, R and Muhigwa, JB and Kanduma, EG and Djikeng, A and Madder, M and Kirschvink, N and Marcotty, T}, title = {Mitochondrial phylogeography and population structure of the cattle tick Rhipicephalus appendiculatus in the African Great Lakes region.}, journal = {Parasites &amp; vectors}, volume = {11}, number = {1}, pages = {329}, pmid = {29855375}, issn = {1756-3305}, support = {ABC089//Africa Biosciences Challenge Fund (ABCF) program, BecA-ILRI Hub/ ; S0020***10402//Agence Universitaire de la Francophonie/ ; IFS-92890CA3//International Foundation for Science/ ; Bourses institutionnelles-Ceruna//Université de Namur/ ; 006/014//Communauté économique des pays des Grands Lacs (CEPGL)/ ; }, mesh = {Africa/epidemiology ; Animals ; Arachnid Vectors/*genetics/parasitology ; Cattle ; Genetic Structures ; *Genetic Variation ; Genetics, Population ; Mitochondria/genetics ; Phylogeny ; Phylogeography ; Population Dynamics ; Rhipicephalus/*genetics/parasitology ; Theileria parva/*physiology ; Theileriasis/epidemiology/*parasitology ; }, abstract = {BACKGROUND: The ixodid tick Rhipicephalus appendiculatus is the main vector of Theileria parva, wich causes the highly fatal cattle disease East Coast fever (ECF) in sub-Saharan Africa. Rhipicephalus appendiculatus populations differ in their ecology, diapause behaviour and vector competence. Thus, their expansion in new areas may change the genetic structure and consequently affect the vector-pathogen system and disease outcomes. In this study we investigated the genetic distribution of R. appendiculatus across agro-ecological zones (AEZs) in the African Great Lakes region to better understand the epidemiology of ECF and elucidate R. appendiculatus evolutionary history and biogeographical colonization in Africa.<br><br>METHODS: Sequencing was performed on two mitochondrial genes (cox1 and 12S rRNA) of 218 ticks collected from cattle across six AEZs along an altitudinal gradient in the Democratic Republic of Congo, Rwanda, Burundi and Tanzania. Phylogenetic relationships between tick populations were determined and evolutionary population dynamics models were assessed by mismach distribution.<br><br>RESULTS: Population genetic analysis yielded 22 cox1 and 9 12S haplotypes in a total of 209 and 126 nucleotide sequences, respectively. Phylogenetic algorithms grouped these haplotypes for both genes into two major clades (lineages A and B). We observed significant genetic variation segregating the two lineages and low structure among populations with high degree of migration. The observed high gene flow indicates population admixture between AEZs. However, reduced number of migrants was observed between lowlands and highlands. Mismatch analysis detected a signature of rapid demographic and range expansion of lineage A. The star-like pattern of isolated and published haplotypes indicates that the two lineages evolve independently and have been subjected to expansion across Africa.<br><br>CONCLUSIONS: Two sympatric R. appendiculatus lineages occur in the Great Lakes region. Lineage A, the most diverse and ubiquitous, has experienced rapid population growth and range expansion in all AEZs probably through cattle movement, whereas lineage B, the less abundant, has probably established a founder population from recent colonization events and its occurrence decreases with altitude. These two lineages are sympatric in central and eastern Africa and allopatric in southern Africa. The observed colonization pattern may strongly affect the transmission system and may explain ECF endemic instability in the tick distribution fringes.}, }
@article {pmid29852202, year = {2018}, author = {Wang, M and Teng, Y}, title = {Genome-wide identification and analysis of MICU genes in land plants and their potential role in calcium stress.}, journal = {Gene}, volume = {670}, number = {}, pages = {174-181}, doi = {10.1016/j.gene.2018.05.102}, pmid = {29852202}, issn = {1879-0038}, mesh = {Calcium/metabolism ; Calcium-Binding Proteins/chemistry/*genetics/metabolism ; Down-Regulation ; Embryophyta/classification/genetics/*metabolism ; Evolution, Molecular ; Phylogeny ; Plant Proteins/chemistry/genetics/metabolism ; Protein Domains ; Signal Transduction ; *Stress, Physiological ; }, abstract = {Mitochondrial calcium uptake (MICU) plays a vital role in the regulation of mitochondrial calcium homeostasis, and, consequently, influences calcium signaling transduction. Although genes involved in mitochondrial calcium uptake have been well studied in animals, less is known about their ubiquity and function in plants. In this study, we identified 96 MICU genes in land plants. On the basis of phylogenetic analysis of MICU proteins, they were classified into three clades: MICU from eudicots (Clade I), from monocots (Clade II), and from a basal angiosperm, a bryophyte, and a lycophyte (Clade III). Pairwise identity analysis across all MICU proteins showed that they are highly conserved among land plants at the protein level. Conserved motif analysis showed that most MICU proteins contained three EF-hands, and an additional EF-hand motif first identified in the MICU of Arabidopsis thaliana but not mammals was found in all 96 putative MICU proteins. This suggests that a cellular pathway of calcium uptake and signaling that requires three EF-hand motifs is evolutionarily conserved in plants. In addition, we discovered that MICU-defective mutants of Arabidopsis thaliana exhibited longer roots than wild-type under high calcium stress. Concurrently, the mRNA transcription levels of MICU were decreased under high calcium conditions. These results suggest that loss-of-function mutations of MICU may have potential roles in helping plants resist high calcium stress. This study provides clues to the possible role of plant MICU in mitochondrial calcium uptake, as well as useful information to support further studies on MICU function in plants.}, }
@article {pmid29852093, year = {2018}, author = {Li, Z and You, XL and Wang, LL and Yan, ZT and Zhou, ZY}, title = {Spore morphology and ultrastructure of an Ascosphaera apis strain from the honeybees (Apis mellifera) in southwest China.}, journal = {Mycologia}, volume = {110}, number = {2}, pages = {325-338}, doi = {10.1080/00275514.2018.1442084}, pmid = {29852093}, issn = {1557-2536}, mesh = {Animals ; Bees/*microbiology ; Cell Wall/chemistry ; China ; Chitin/analysis ; Cluster Analysis ; DNA, Fungal/chemistry/genetics ; DNA, Ribosomal Spacer/chemistry/genetics ; Microscopy ; Microscopy, Confocal ; Microscopy, Electron, Transmission ; Onygenales/classification/*cytology/isolation &amp; purification/*ultrastructure ; Organelles/ultrastructure ; Phylogeny ; RNA, Ribosomal, 5.8S ; Sequence Analysis, DNA ; Spores, Fungal/*cytology/*ultrastructure ; }, abstract = {Ascosphaera apis is an intestinally infective, spore-forming, filamentous fungus that infects honeybees and causes deadly chalkbrood disease. Although A. apis has been known for 60 y, little is known about the ultrastructure of the spores. In this study, the fine morphology and ultrastructure of an isolate, A. apis CQ1 from southwest China, was comprehensively identified by transmission electron microscopy, confocal laser scanning microscopy, scanning electron microscopy, and optical microscopy. The high sequence similarity and phylogenetic data based on nuc rDNA ITS1-5.8S-ITS2 (ITS) supported the hypothesis that the CQ1 strain is a new member of the A. apis species. Morphological observation indicated that the mature spores are long ovals with an average size of 2 × 1.2 µm and are tightly packed inside spherical spore balls. More than 10 spore balls that were 8-16 µm in diameter were wrapped and formed a spherical, nearly hyaline spore cyst of 50-60 µm in diameter. Ultrastructural analysis showed that mature spores have two nuclei with distinctly different sizes. A large nucleus with double nuclear membranes was found in the center of the spore, whereas the small nucleus was only one-fifth of the large nucleus volume and was located near the end of the spore. Numerous ribosomes filled the cytoplasm, and many mitochondria with well-defined structures were arranged along the inner spore wall. The spore wall consists of an electron-dense outer surface layer, an electron-lucent layer, and an inner plasma membrane. Chitin is the major component of the spore wall. The germinated spore was observed as an empty spore coat, whereas the protoplasts, including the nuclei, mitochondria, and ribosomes, had been discharged. In addition to these typical fungal spore organelles, an unknown electron-dense regular structure might be the growing mycelium, which was arranged close to the inner spore wall and almost covered the entire wall area.}, }
@article {pmid29851233, year = {2018}, author = {Solari, KA and Hadly, EA}, title = {Evolution for extreme living: variation in mitochondrial cytochrome c oxidase genes correlated with elevation in pikas (genus Ochotona).}, journal = {Integrative zoology}, volume = {13}, number = {5}, pages = {517-535}, doi = {10.1111/1749-4877.12332}, pmid = {29851233}, issn = {1749-4877}, mesh = {Adaptation, Physiological/*genetics ; Altitude ; Animals ; *Biological Evolution ; Ecosystem ; Electron Transport Complex IV/genetics/*metabolism ; Gene Expression Regulation, Enzymologic ; Lagomorpha/genetics/*physiology ; Mitochondria/*enzymology ; Phylogeny ; }, abstract = {The genus Ochotona (pikas) is a clade of cold-tolerant lagomorphs that includes many high-elevation species. Pikas offer a unique opportunity to study adaptations and potential limitations of an ecologically important mammal to high-elevation hypoxia. We analyzed the evolution of 3 mitochondrial genes encoding the catalytic core of cytochrome c oxidase (COX) in 10 pika species occupying elevations from sea level to 5000 m. COX is an enzyme highly reliant on oxygen and essential for cell function. One amino acid property, the equilibrium constant (ionization of COOH), was found to be under selection in the overall protein complex. We observed a strong relationship between the net value change in this property and the elevation each species occupies, with higher-elevation species having potentially more efficient proteins. We also found evidence of selection in low-elevation species for potentially less efficient COX, perhaps trading efficiency for heat production in the absence of hypoxia. Our results suggest that different pika species may have evolved elevation-specific COX proteins, specialization that may indicate limitations in their ability to shift their elevational ranges in response to future climate change.}, }
@article {pmid29850800, year = {2018}, author = {Guillory, WX and Onyshchenko, A and Ruck, EC and Parks, M and Nakov, T and Wickett, NJ and Alverson, AJ}, title = {Recurrent Loss, Horizontal Transfer, and the Obscure Origins of Mitochondrial Introns in Diatoms (Bacillariophyta).}, journal = {Genome biology and evolution}, volume = {10}, number = {6}, pages = {1504-1515}, pmid = {29850800}, issn = {1759-6653}, mesh = {DNA, Mitochondrial/genetics ; Diatoms/*genetics ; Evolution, Molecular ; Gene Transfer, Horizontal/*genetics ; Genome, Mitochondrial/*genetics ; Introns/*genetics ; Mitochondria/*genetics ; Phylogeny ; Sequence Analysis, DNA/methods ; }, abstract = {We sequenced mitochondrial genomes from five diverse diatoms (Toxarium undulatum, Psammoneis japonica, Eunotia naegelii, Cylindrotheca closterium, and Nitzschia sp.), chosen to fill important phylogenetic gaps and help us characterize broadscale patterns of mitochondrial genome evolution in diatoms. Although gene content was strongly conserved, intron content varied widely across species. The vast majority of introns were of group II type and were located in the cox1 or rnl genes. Although recurrent intron loss appears to be the principal underlying cause of the sporadic distributions of mitochondrial introns across diatoms, phylogenetic analyses showed that intron distributions superficially consistent with a recurrent-loss model were sometimes more complicated, implicating horizontal transfer as a likely mechanism of intron acquisition as well. It was not clear, however, whether diatoms were the donors or recipients of horizontally transferred introns, highlighting a general challenge in resolving the evolutionary histories of many diatom mitochondrial introns. Although some of these histories may become clearer as more genomes are sampled, high rates of intron loss suggest that the origins of many diatom mitochondrial introns are likely to remain unclear.}, }
@article {pmid29848319, year = {2018}, author = {Bronstein, O and Kroh, A and Haring, E}, title = {Mind the gap! The mitochondrial control region and its power as a phylogenetic marker in echinoids.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {80}, pmid = {29848319}, issn = {1471-2148}, support = {P 29508//Austrian Science Fund FWF/Austria ; P 29508-B25//Austrian Science Fund/International ; }, mesh = {Algorithms ; Animals ; Base Sequence ; DNA Primers/metabolism ; DNA, Mitochondrial/genetics ; Genes, Mitochondrial ; Genetic Markers ; *Genome, Mitochondrial ; High-Throughput Nucleotide Sequencing ; Mitochondria/*genetics ; *Phylogeny ; RNA, Ribosomal, 16S/genetics ; RNA, Transfer/genetics ; Sea Urchins/*genetics ; }, abstract = {BACKGROUND: In Metazoa, mitochondrial markers are the most commonly used targets for inferring species-level molecular phylogenies due to their extremely low rate of recombination, maternal inheritance, ease of use and fast substitution rate in comparison to nuclear DNA. The mitochondrial control region (CR) is the main non-coding area of the mitochondrial genome and contains the mitochondrial origin of replication and transcription. While sequences of the cytochrome oxidase subunit 1 (COI) and 16S rRNA genes are the prime mitochondrial markers in phylogenetic studies, the highly variable CR is typically ignored and not targeted in such analyses. However, the higher substitution rate of the CR can be harnessed to infer the phylogeny of closely related species, and the use of a non-coding region alleviates biases resulting from both directional and purifying selection. Additionally, complete mitochondrial genome assemblies utilizing next generation sequencing (NGS) data often show exceptionally low coverage at specific regions, including the CR. This can only be resolved by targeted sequencing of this region.<br><br>RESULTS: Here we provide novel sequence data for the echinoid mitochondrial control region in over 40 species across the echinoid phylogenetic tree. We demonstrate the advantages of directly targeting the CR and adjacent tRNAs to facilitate complementing low coverage NGS data from complete mitochondrial genome assemblies. Finally, we test the performance of this region as a phylogenetic marker both in the lab and in phylogenetic analyses, and demonstrate its superior performance over the other available mitochondrial markers in echinoids.<br><br>CONCLUSIONS: Our target region of the mitochondrial CR (1) facilitates the first thorough investigation of this region across a wide range of echinoid taxa, (2) provides a tool for complementing missing data in NGS experiments, and (3) identifies the CR as a powerful, novel marker for phylogenetic inference in echinoids due to its high variability, lack of selection, and high compatibility across the entire class, outperforming conventional mitochondrial markers.}, }
@article {pmid29848286, year = {2018}, author = {Darbani, B and Kell, DB and Borodina, I}, title = {Energetic evolution of cellular Transportomes.}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {418}, pmid = {29848286}, issn = {1471-2164}, support = {NNF10CC1016517//The Novo Nordisk Foundation Center for Biosustainability/ ; BB/M006891/1, BB/M017702/1 and BB/P009042/1//Biotechnology and Biological Sciences Research Council/United Kingdom ; 757384//H2020 European Research Council/ ; }, mesh = {*Energy Metabolism ; *Evolution, Molecular ; *Genomics ; Membrane Transport Proteins/*metabolism ; }, abstract = {BACKGROUND: Transporter proteins mediate the translocation of substances across the membranes of living cells. Many transport processes are energetically expensive and the cells use 20 to 60% of their energy to power the transportomes. We hypothesized that there may be an evolutionary selection pressure for lower energy transporters.<br><br>RESULTS: We performed a genome-wide analysis of the compositional reshaping of the transportomes across the kingdoms of bacteria, archaea, and eukarya. We found that the share of ABC transporters is much higher in bacteria and archaea (ca. 27% of the transportome) than in primitive eukaryotes (13%), algae and plants (10%) and in fungi and animals (5-6%). This decrease is compensated by an increased occurrence of secondary transporters and ion channels. The share of ion channels is particularly high in animals (ca. 30% of the transportome) and algae and plants with (ca. 13%), when compared to bacteria and archaea with only 6-7%. Therefore, our results show a move to a preference for the low-energy-demanding transporters (ion channels and carriers) over the more energy-costly transporter classes (ATP-dependent families, and ABCs in particular) as part of the transition from prokaryotes to eukaryotes. The transportome analysis also indicated seven bacterial species, including Neorickettsia risticii and Neorickettsia sennetsu, as likely origins of the mitochondrion in eukaryotes, based on the phylogenetically restricted presence therein of clear homologues of modern mitochondrial solute carriers.<br><br>CONCLUSIONS: The results indicate that the transportomes of eukaryotes evolved strongly towards a higher energetic efficiency, as ATP-dependent transporters diminished and secondary transporters and ion channels proliferated. These changes have likely been important in the development of tissues performing energetically costly cellular functions.}, }
@article {pmid29843612, year = {2018}, author = {Hartmann, T and Bernt, M and Middendorf, M}, title = {EqualTDRL: illustrating equivalent tandem duplication random loss rearrangements.}, journal = {BMC bioinformatics}, volume = {19}, number = {1}, pages = {192}, pmid = {29843612}, issn = {1471-2105}, abstract = {BACKGROUND: To study the differences between two unichromosomal circular genomes, e.g., mitochondrial genomes, under the tandem duplication random loss (TDRL) rearrangement it is important to consider the whole set of potential TDRL rearrangement events that could have taken place. The reason is that for two given circular gene orders there can exist different TDRL rearrangements that transform one of the gene orders into the other. Hence, a TDRL event cannot always be reconstructed only from the knowledge of the circular gene order before a TDRL event and the circular gene order after it.<br><br>RESULTS: We present the program EqualTDRL that computes and illustrates the complete set of TDRLs for pairs of circular gene orders that differ by only one TDRL. EqualTDRL considers the circularity of the given genomes and certain restrictions on the TDRL rearrangements. Examples for the latter are sequences of genes that have to be conserved during a TDRL or pairs of genes that frame intergenic regions which might represent remnants of duplicated genes. Additionally, EqualTDRL allows to determine the set of TDRLs that are minimum with respect to the number of duplicated genes.<br><br>CONCLUSION: EqualTDRL supports scientists to study the complete set of TDRLs that possibly could have taken place in the evolution of mitochondrial genomes. EqualTDRL is implemented in C++ using the ggplot2 package of the open source programming language R and is freely available from http://pacosy.informatik.uni-leipzig.de/equaltdrl .}, }
@article {pmid29843598, year = {2018}, author = {Perry, KD and Baker, GJ and Powis, KJ and Kent, JK and Ward, CM and Baxter, SW}, title = {Cryptic Plutella species show deep divergence despite the capacity to hybridize.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {77}, pmid = {29843598}, issn = {1471-2148}, support = {UA00146//University of Adelaide/International ; DAS00094//Grains Research and Development Corporation/International ; DAS00155//Grains Research and Development Corporation/International ; DAS00155//Grains Research and Development Corporation/International ; DAS00155//Grains Research and Development Corporation/International ; DP120100047//Australian Research Council/International ; FT140101303//Australian Research Council/International ; }, mesh = {Animals ; Australia ; Biological Assay ; Crosses, Genetic ; DNA, Mitochondrial/genetics ; Female ; Fertility ; *Genetic Variation ; Genetics, Population ; Geography ; Haplotypes/genetics ; Heterozygote ; *Hybridization, Genetic/drug effects ; Insecticide Resistance/drug effects/genetics ; Insecticides/toxicity ; Likelihood Functions ; Male ; Mitochondria/genetics ; Moths/*genetics/microbiology ; Phylogeny ; Species Specificity ; Sympatry ; Wolbachia/drug effects/physiology ; }, abstract = {BACKGROUND: Understanding genomic and phenotypic diversity among cryptic pest taxa has important implications for the management of pests and diseases. The diamondback moth, Plutella xylostella L., has been intensively studied due to its ability to evolve insecticide resistance and status as the world's most destructive pest of brassicaceous crops. The surprise discovery of a cryptic species endemic to Australia, Plutella australiana Landry &amp; Hebert, raised questions regarding the distribution, ecological traits and pest status of the two species, the capacity for gene flow and whether specific management was required. Here, we collected Plutella from wild and cultivated brassicaceous plants from 75 locations throughout Australia and screened 1447 individuals to identify mtDNA lineages and Wolbachia infections. We genotyped genome-wide SNP markers using RADseq in coexisting populations of each species. In addition, we assessed reproductive compatibility in crossing experiments and insecticide susceptibility phenotypes using bioassays.<br><br>RESULTS: The two Plutella species coexisted on wild brassicas and canola crops, but only 10% of Plutella individuals were P. australiana. This species was not found on commercial Brassica vegetable crops, which are routinely sprayed with insecticides. Bioassays found that P. australiana was 19-306 fold more susceptible to four commonly-used insecticides than P. xylostella. Laboratory crosses revealed that reproductive isolation was incomplete but directionally asymmetric between the species. However, genome-wide nuclear SNPs revealed striking differences in genetic diversity and strong population structure between coexisting wild populations of each species. Nuclear diversity was 1.5-fold higher in P. australiana, yet both species showed limited variation in mtDNA. Infection with a single Wolbachia subgroup B strain was fixed in P. australiana, suggesting that a selective sweep contributed to low mtDNA diversity, while a subgroup A strain infected just 1.5% of P. xylostella.<br><br>CONCLUSIONS: Despite sympatric distributions and the capacity to hybridize, strong genomic and phenotypic divergence exists between these Plutella species that is consistent with contrasting colonization histories and reproductive isolation after secondary contact. Although P. australiana is a potential pest of brassicaceous crops, it is of secondary importance to P. xylostella.}, }
@article {pmid29842994, year = {2018}, author = {Weerts, MJA and Timmermans, EC and van de Stolpe, A and Vossen, RHAM and Anvar, SY and Foekens, JA and Sleijfer, S and Martens, JWM}, title = {Tumor-Specific Mitochondrial DNA Variants Are Rarely Detected in Cell-Free DNA.}, journal = {Neoplasia (New York, N.Y.)}, volume = {20}, number = {7}, pages = {687-696}, pmid = {29842994}, issn = {1476-5586}, mesh = {Aged ; Aged, 80 and over ; Alleles ; *Biomarkers, Tumor ; *Circulating Tumor DNA ; Computational Biology/methods ; *DNA, Mitochondrial ; *DNA, Neoplasm ; Female ; Gene Frequency ; Genetic Heterogeneity ; *Genetic Variation ; High-Throughput Nucleotide Sequencing ; Humans ; Male ; Middle Aged ; Neoplasm Staging ; Neoplasms/*genetics/pathology ; Phylogeny ; }, abstract = {The use of blood-circulating cell-free DNA (cfDNA) as a &quot;liquid biopsy&quot; in oncology is being explored for its potential as a cancer biomarker. Mitochondria contain their own circular genomic entity (mitochondrial DNA, mtDNA), up to even thousands of copies per cell. The mutation rate of mtDNA is several orders of magnitude higher than that of the nuclear DNA. Tumor-specific variants have been identified in tumors along the entire mtDNA, and their number varies among and within tumors. The high mtDNA copy number per cell and the high mtDNA mutation rate make it worthwhile to explore the potential of tumor-specific cf-mtDNA variants as cancer marker in the blood of cancer patients. We used single-molecule real-time (SMRT) sequencing to profile the entire mtDNA of 19 tissue specimens (primary tumor and/or metastatic sites, and tumor-adjacent normal tissue) and 9 cfDNA samples, originating from 8 cancer patients (5 breast, 3 colon). For each patient, tumor-specific mtDNA variants were detected and traced in cfDNA by SMRT sequencing and/or digital PCR to explore their feasibility as cancer biomarker. As a reference, we measured other blood-circulating biomarkers for these patients, including driver mutations in nuclear-encoded cfDNA and cancer-antigen levels or circulating tumor cells. Four of the 24 (17%) tumor-specific mtDNA variants were detected in cfDNA, however at much lower allele frequencies compared to mutations in nuclear-encoded driver genes in the same samples. Also, extensive heterogeneity was observed among the heteroplasmic mtDNA variants present in an individual. We conclude that there is limited value in tracing tumor-specific mtDNA variants in blood-circulating cfDNA with the current methods available.}, }
@article {pmid29808012, year = {2018}, author = {Yuan, L and Zhai, L and Qian, L and Huang,  and Ding, Y and Xiang, H and Liu, X and Thompson, JW and Liu, J and He, YH and Chen, XQ and Hu, J and Kong, QP and Tan, M and Wang, XF}, title = {Switching off IMMP2L signaling drives senescence via simultaneous metabolic alteration and blockage of cell death.}, journal = {Cell research}, volume = {28}, number = {6}, pages = {625-643}, pmid = {29808012}, issn = {1748-7838}, support = {R01 CA154586/CA/NCI NIH HHS/United States ; UL1 TR001117/TR/NCATS NIH HHS/United States ; }, abstract = {Cellular senescence is a fundamental cell fate playing a significant role throughout the natural aging process. However, the molecular determinants distinguishing senescence from other cell-cycle arrest states such as quiescence and post-mitotic state, and the specified mechanisms underlying cell-fate decisions towards senescence versus cell death in response to cellular stress stimuli remain less understood. Employing multi-omics approaches, we revealed that switching off the specific mitochondrial processing machinery involving the peptidase IMMP2L serves as the foundation of the senescence program, which was also observed during the mammalian aging process. Mechanistically, we demonstrate that IMMP2L processes and thus activates at least two substrates, mitochondrial metabolic enzyme glycerol-3-phosphate dehydrogenase (GPD2) and cell death regulator apoptosis-inducing factor (AIF). For cells destined to senesce, concerted shutdown of the IMMP2L-GPD2 and IMMP2L-AIF signaling axes collaboratively drives the senescent process by reprogramming mitochondria-associated redox status, phospholipid metabolism and signaling network, and simultaneously blocking cell death under oxidative stress conditions.}, }
@article {pmid29806019, year = {2018}, author = {Taborsky, M and Schütz, D and Goffinet, O and van Doorn, GS}, title = {Alternative male morphs solve sperm performance/longevity trade-off in opposite directions.}, journal = {Science advances}, volume = {4}, number = {5}, pages = {eaap8563}, pmid = {29806019}, issn = {2375-2548}, abstract = {Males pursuing alternative reproductive tactics have been predicted to face a trade-off between maximizing either swimming performance or endurance of their sperm. However, empirical evidence for this trade-off is equivocal, which may be due to simplistic assumptions. In the shell-brooding cichlid fish Lamprologus callipterus, two Mendelian male morphs compete for fertilization by divergent means: Bourgeois nest males ejaculate sperm, on average, about six times farther from the unfertilized ova than do parasitic dwarf males. This asymmetry is opposite to the usual situation, in which bourgeois males typically benefit from superior fertilization opportunities, suggesting that nest males' sperm should persist longer than dwarf male sperm. The assumed trade-off between sperm swimming performance and longevity predicts that, in turn, sperm of dwarf males should outperform that of nest males in swimming efficiency. Measurement of sperm performance and endurance reveals that dwarf male spermatozoa swim straighter initially than those of nest males, but their motility declines earlier and their velocity slows down more abruptly. Nest male sperm survives longer, which relates to a larger sperm head plus midpiece, implying more mitochondria. Thus, the trade-off between sperm performance and endurance is optimized in opposite directions by alternative male morphs. We argue that the relative success of alternative sperm performance strategies can be influenced strongly by environmental factors such as the time window between gamete release and fertilization, and the position of gamete release. This is an important yet little understood aspect of gametic adaptations to sperm competition.}, }
@article {pmid29802659, year = {2018}, author = {Tilquin, A and Christie, JR and Kokko, H}, title = {Mitochondrial complementation: a possible neglected factor behind early eukaryotic sex.}, journal = {Journal of evolutionary biology}, volume = {31}, number = {8}, pages = {1152-1164}, doi = {10.1111/jeb.13293}, pmid = {29802659}, issn = {1420-9101}, abstract = {Sex is ancestral in eukaryotes. Meiotic sex differs from bacterial ways of exchanging genetic material by involving the fusion of two cells. We examine the hypothesis that fusion evolved in early eukaryotes because it was directly beneficial, rather than a passive side effect of meiotic sex. We assume that the uptake of (proto)mitochondria into eukaryotes preceded the evolution of cell fusion and that Muller's ratchet operating within symbiont lineages led to the accumulation of lineage-specific sets of mutations in asexual host cells. We examine whether cell fusion, and the consequent biparental inheritance of symbionts, helps to mitigate the effects of this mutational meltdown of mitochondria. In our model, host cell fitness improves when two independently evolved mitochondrial strains co-inhabit a single cytoplasm, mirroring mitochondrial complementation found in modern eukaryotes. If fusion incurs no cost, we find that an allele coding for fusion can invade a population of nonfusers. If fusion is costly, there are two thresholds. The first describes a maximal fusing rate (probability of fusion per round of cell division) that is able to fix. An allele that codes for a rate above this threshold can reach a polymorphic equilibrium with nonfusers, as long as the rate is below the second threshold, above which the fusion allele is counter-selected. Whenever it evolves, fusion increases the population-wide level of heteroplasmy, which allows mitochondrial complementation and increases population fitness. We conclude that beneficial interactions between mitochondria are a potential factor that selected for cell fusion in early eukaryotes.}, }
@article {pmid29799088, year = {2018}, author = {Li, Q and Chen, C and Xiong, C and Jin, X and Chen, Z and Huang, W}, title = {Comparative mitogenomics reveals large-scale gene rearrangements in the mitochondrial genome of two Pleurotus species.}, journal = {Applied microbiology and biotechnology}, volume = {102}, number = {14}, pages = {6143-6153}, doi = {10.1007/s00253-018-9082-6}, pmid = {29799088}, issn = {1432-0614}, support = {2016NZ0042//The National Science &amp; Technology Pillar Program of Sichuan/ ; 2016NZ0103//the Crop Molecular Breeding Platform in Sichuan/ ; }, mesh = {DNA, Mitochondrial/genetics ; Gene Rearrangement/*genetics ; Genome, Mitochondrial/*genetics ; Phylogeny ; Pleurotus/classification/*genetics ; Species Specificity ; }, abstract = {In the present study, we assembled the mitogenomes of Pleurotus citrinopileatus and Pleurotus platypus. The circular mitogenome of the two Pleurotus species comprises a set of 14 conserved protein-encoding genes (PEGs), 2 RNA genes (small subunit ribosomal RNA and large subunit ribosomal RNA), and 24 tRNAs, with sizes of 60,694 and 73,807 bp, respectively. They contain 4 and 10 introns with 3 and 10 intronic open reading frames (ORFs), respectively. Thirteen position classes (Pcls) of introns were found in the cox1 gene of four Pleurotus species. The number and class of Pcl varied among different Pleurotus species, indicating that numerous events of loss and gain occurred during evolution of Pleurotus. Comparative mitogenomic and collinearity analyses reveal that large-scale gene rearrangements may have occurred during the evolution of Pleurotus citrinopileatus and Pleurotus platypus, including gene rearrangements and inversions, which may be related to the observed high amounts of repetitive DNA elements (5.62 and 5.45%, respectively). Phylogenetic analysis based on concatenated mitochondrial protein sequences reveals that concatenated mitochondrial genes are suitable as molecular markers for phylogenetic analysis. This serves as the first report on large-scale rearrangements in the mitochondria of the genus Pleurotus, thereby improving our understanding of the evolution of the Pleurotus genus and other macrofungi.}, }
@article {pmid29794164, year = {2018}, author = {Ries, LNA and José de Assis, L and Rodrigues, FJS and Caldana, C and Rocha, MC and Malavazi, I and Bayram, Ö and Goldman, GH}, title = {The Aspergillus nidulans Pyruvate Dehydrogenase Kinases Are Essential To Integrate Carbon Source Metabolism.}, journal = {G3 (Bethesda, Md.)}, volume = {8}, number = {7}, pages = {2445-2463}, pmid = {29794164}, issn = {2160-1836}, mesh = {Aspergillus nidulans/classification/genetics/*metabolism ; Carbon/*metabolism ; Catabolite Repression ; Gene Expression Regulation, Enzymologic ; Gene Expression Regulation, Fungal ; Glucose/metabolism ; Hydrolysis ; Metabolic Networks and Pathways ; Metabolome ; Metabolomics/methods ; Multigene Family ; Phylogeny ; Protein Interaction Mapping ; Protein Interaction Maps ; Protein Transport ; Protein-Serine-Threonine Kinases/genetics/*metabolism ; }, abstract = {The pyruvate dehydrogenase complex (PDH), that converts pyruvate to acetyl-coA, is regulated by pyruvate dehydrogenase kinases (PDHK) and phosphatases (PDHP) that have been shown to be important for morphology, pathogenicity and carbon source utilization in different fungal species. The aim of this study was to investigate the role played by the three PDHKs PkpA, PkpB and PkpC in carbon source utilization in the reference filamentous fungus Aspergillus nidulans, in order to unravel regulatory mechanisms which could prove useful for fungal biotechnological and biomedical applications. PkpA and PkpB were shown to be mitochondrial whereas PkpC localized to the mitochondria in a carbon source-dependent manner. Only PkpA was shown to regulate PDH activity. In the presence of glucose, deletion of pkpA and pkpC resulted in reduced glucose utilization, which affected carbon catabolite repression (CCR) and hydrolytic enzyme secretion, due to de-regulated glycolysis and TCA cycle enzyme activities. Furthermore, PkpC was shown to be required for the correct metabolic utilization of cellulose and acetate. PkpC negatively regulated the activity of the glyoxylate cycle enzyme isocitrate lyase (ICL), required for acetate metabolism. In summary, this study identified PDHKs important for the regulation of central carbon metabolism in the presence of different carbon sources, with effects on the secretion of biotechnologically important enzymes and carbon source-related growth. This work demonstrates how central carbon metabolism can affect a variety of fungal traits and lays a basis for further investigation into these characteristics with potential interest for different applications.}, }
@article {pmid29794041, year = {2018}, author = {Camus, MF and Dowling, DK}, title = {Mitochondrial genetic effects on reproductive success: signatures of positive intrasexual, but negative intersexual pleiotropy.}, journal = {Proceedings. Biological sciences}, volume = {285}, number = {1879}, pages = {}, pmid = {29794041}, issn = {1471-2954}, mesh = {Animals ; Drosophila melanogaster/genetics/*physiology ; Female ; Genes, Mitochondrial/*genetics ; *Genetic Pleiotropy ; *Genetic Variation ; *Haplotypes ; Male ; Reproduction ; }, abstract = {Theory predicts that maternal inheritance of mitochondria will facilitate the accumulation of mtDNA mutations that are male biased, or even sexually antagonistic, in effect. While there are many reported cases of mtDNA mutations conferring cytoplasmic male sterility in plants, historically it was assumed such mutations would not persist in the streamlined mitochondrial genomes of bilaterian metazoans. Intriguingly, recent cases of mitochondrial variants exerting male biases in effect have come to light in bilaterians. These cases aside, it remains unknown whether the mitochondrial genetic variation affecting phenotypic expression, and in particular reproductive performance, in bilaterians is routinely composed of sex-biased or sex-specific variation. If selection consistently favours mtDNA variants that augment female fitness, but at cost to males, this could shape patterns of pleiotropy and lead to negative intersexual correlations across mtDNA haplotypes. Here, we show that genetic variation across naturally occurring mitochondrial haplotypes affects components of reproductive success in both sexes, in the fruit fly Drosophila melanogaster We find that intrasexual correlations across mitochondrial haplotypes, for components of reproductive success, are generally positive, while intersexual correlations are negative. These results accord with theoretical predictions, suggesting that maternal inheritance has led to the fixation of numerous mutations of sexually antagonistic effect.}, }
@article {pmid29792772, year = {2018}, author = {Xia, C and Wang, M and Yin, C and Cornejo, OE and Hulbert, SH and Chen, X}, title = {Genome Sequence Resources for the Wheat Stripe Rust Pathogen (Puccinia striiformis f. sp. tritici) and the Barley Stripe Rust Pathogen (Puccinia striiformis f. sp. hordei).}, journal = {Molecular plant-microbe interactions : MPMI}, volume = {31}, number = {11}, pages = {1117-1120}, doi = {10.1094/MPMI-04-18-0107-A}, pmid = {29792772}, issn = {0894-0282}, mesh = {Basidiomycota/*genetics ; Genome, Fungal/*genetics ; *Genomics ; Genotype ; High-Throughput Nucleotide Sequencing ; Hordeum/*microbiology ; Phenotype ; Plant Diseases/*microbiology ; Sequence Analysis, RNA ; Triticum/*microbiology ; }, abstract = {Puccinia striiformis f. sp. tritici causes devastating stripe (yellow) rust on wheat and P. striiformis f. sp. hordei causes stripe rust on barley. Several P. striiformis f. sp. tritici genomes are available, but no P. striiformis f. sp. hordei genome is available. More genomes of P. striiformis f. sp. tritici and P. striiformis f. sp. hordei are needed to understand the genome evolution and molecular mechanisms of their pathogenicity. We sequenced P. striiformis f. sp. tritici isolate 93-210 and P. striiformis f. sp. hordei isolate 93TX-2, using PacBio and Illumina technologies and RNA sequencing. Their genomic sequences were assembled to contigs with high continuity and showed significant structural differences. The circular mitochondria genomes of both were complete. These genomes provide high-quality resources for deciphering the genomic basis of rapid evolution and host adaptation, identifying genes for avirulence and other important traits, and studying host-pathogen interactions.}, }
@article {pmid29787825, year = {2018}, author = {Long, Z and Li, H and Du, Y and Han, B}, title = {Congenital sideroblastic anemia: Advances in gene mutations and pathophysiology.}, journal = {Gene}, volume = {668}, number = {}, pages = {182-189}, doi = {10.1016/j.gene.2018.05.074}, pmid = {29787825}, issn = {1879-0038}, mesh = {Anemia, Sideroblastic/congenital/*genetics/metabolism ; Heme/biosynthesis ; Humans ; Iron/metabolism ; Mitochondrial Proteins/biosynthesis ; *Mutation ; }, abstract = {Congenital sideroblastic anemia (CSA) is a series of rare, heterogeneous disorders, characterized by iron overload in the mitochondria of erythroblasts and ringed sideroblasts in bone marrow. In recent years, rapid development of next-generation sequencing technology brings great advance in understanding of genetic and pathophysiologic features of CSA. Based on the pathophysiology of mitochondrial iron metabolism, causative genes of CSA can be divided into three subtypes: heme biosynthesis related; iron‑sulfur cluster biosynthesis and transportation related; and mitochondrial respiratory chain synthesis related. Patients with CSA present various clinical manifestation due to relevant mutation gene and require different treatment strategies. The recognition of the causative genes and evolution of pathogenicity is critical. In this review, we summarize the recent progress in mutation genes of CSA, and its potential role in the pathogenesis, diagnosis and treatment.}, }
@article {pmid29787733, year = {2018}, author = {Younas, F and Soltanmohammadi, N and Knapp, O and Benz, R}, title = {The major outer membrane protein of Legionella pneumophila Lpg1974 shows pore-forming characteristics similar to the human mitochondrial outer membrane pore, hVDAC1.}, journal = {Biochimica et biophysica acta. Biomembranes}, volume = {1860}, number = {8}, pages = {1544-1553}, doi = {10.1016/j.bbamem.2018.05.008}, pmid = {29787733}, issn = {0005-2736}, mesh = {Amino Acid Sequence ; Bacterial Outer Membrane Proteins/chemistry/classification/genetics/*metabolism ; Escherichia coli/metabolism ; Humans ; Legionella pneumophila/*metabolism ; Lipid Bilayers/chemistry/metabolism ; Phylogeny ; Protein Structure, Secondary ; Recombinant Proteins/biosynthesis/chemistry/isolation &amp; purification ; Sequence Alignment ; Voltage-Dependent Anion Channel 1/chemistry/*metabolism ; }, abstract = {Legionella pneumophila is an aerobic and nonspore-forming pathogenic Gram-negative bacterium of the genus Legionella. It is the causative agent of Legionnaires' disease, also known as Legionellosis. The hosts of this organism are diverse, ranging from simple water borne protozoans such as amoebae to more complex hosts such as macrophages in humans. Genome analyses have shown the presence of genes coding for eukaryotic like proteins in several Legionella species. The presence of these proteins may assist L. pneumophila in its adaptation to the eukaryotic host. We studied the characteristics of a protein (Lpg1974) of L. pneumophila that shows remarkable homologies in length of the primary sequence and for the identity/homology of many amino acids to the voltage dependent anion channel (human VDAC1, Porin 31HL) of human mitochondria. Two different forms of Lpg1974 were overexpressed in Escherichia coli and purified to homogeneity: the one containing a putative N-terminal signal sequence and one without it. Reconstituted protein containing the signal sequence formed ion-permeable pores in lipid bilayer membranes with a conductance of approximately 5.4 nS in 1 M KCl. When the predicted N-terminal signal peptide of Lpg1974 comprising an α-helical structure similar to that at the N-terminus of hVDAC1 was removed, the channels formed in reconstitution experiments had a conductance of 7.6 nS in 1 M KCl. Both Lpg1974 proteins formed pores that were voltage-dependent and anion-selective similar to the pores formed by hVDAC1. These results suggest that Lpg1974 of L. pneumophila is indeed a structural and functional homologue to hVDAC1.}, }
@article {pmid29779502, year = {2018}, author = {Buysse, M and Duron, O}, title = {Multi-locus phylogenetics of the Midichloria endosymbionts reveals variable specificity of association with ticks.}, journal = {Parasitology}, volume = {145}, number = {14}, pages = {1969-1978}, doi = {10.1017/S0031182018000793}, pmid = {29779502}, issn = {1469-8161}, abstract = {Candidatus Midichloria mitochondrii is a maternally inherited bacterium of ticks with a unique intra-mitochondrial lifestyle. Here, we investigate on the evolutionary history of these associations and the degree of Midichloria-tick specificity. While previous surveys used the 16S rRNA gene as an exclusive molecular marker, we rather developed a multi-locus typing method based on four more variable housekeeping genes (groEL, rpoB, dnaK and ftsZ) and on one flagellum gene (fliC) present in Midichloria genomes. Using this method, multi-locus phylogenetic analyses revealed the structuring of a wide Midichloria genetic diversity into three distinct lineages associated with ticks. Overall, two distinct evolutionary strategies are obvious depending on lineage: two Midichloria lineages are generalists with infections acquired through horizontal transfers between distantly related tick species but one other Midichloria lineage rather show a high specificity degree to the Ixodes tick genus. This pattern suggests a capacity of certain Midichloria strains to maintain infections in only limited range of related tick species. These different infection strategies of Midichloria highlight an unexpected variability in their dependency to their tick hosts. We further conjecture that this pattern is also likely to indicate variability in their effects on ticks.}, }
@article {pmid29770661, year = {2018}, author = {Cang-Lin, Z and Jia, P and Zhen, R and Jin-Rong, Z and Ya-Ming, Y}, title = {[Genotyping and polymorphism analysis of cytochrome c oxidase subunit Ⅰ gene of Pomacea canaliculata from Lincang City in Yunnan Province].}, journal = {Zhongguo xue xi chong bing fang zhi za zhi = Chinese journal of schistosomiasis control}, volume = {30}, number = {2}, pages = {179-183}, doi = {10.16250/j.32.1374.2017163}, pmid = {29770661}, issn = {1005-6661}, mesh = {Angiostrongylus cantonensis ; Animals ; China ; DNA, Mitochondrial/genetics ; Electron Transport Complex IV/*genetics ; Gastropoda/enzymology/*genetics ; Genotype ; Haplotypes ; Phylogeny ; }, abstract = {OBJECTIVE: To analyze the genetic diversity of Pomacea canaliculata based on the mitochondria DNA cytochrome c oxidase subunit Ⅰ (mtDNA COⅠ) gene as a molecular marker in Lincang City of Yunnan Province, so as to provide the scientific data for monitoring Angiostrongylus cantonensis in local areas.<br><br>METHODS: The genotypes and polymorphisms of 38 specimens of P. canaliculata collected from Mengding Town of Lincang City were analyzed by sequencing COⅠ gene. The phylogenetic tree and genetic distances were produced based on the haplotypes from GenBank and the present study by using the neighbourjoining method with the software MEGA version 6.06.<br><br>RESULTS: Totally 31 sequences were acquired in the present study and they produced 3 unique haplotypes. Haplotype 1 showed a higher frequency compared to the others and it accounted for 83.9 % (26/31). The data showed that the least genetic distances ranged from 0 to 0.052 between P. canaliculata and 3 haplotypes, as well as the largest genetic distances ranged from 0.021 to 0.239 between Pila conica and 3 haplotypes. Otherwise, the analysis of the phylogenetic trees based on COⅠ gene sequences of P. canaliculata indicated that all of 3 haplotypes clustered into one big clade with that from Japan (GenBank accession number: AB433769), China (GenBank accession number: KT313034) and USA (GenBank accession number: EU523129), which owned the closet relationship amongst them. Their genetic relationships were distantly related to the GenBank's reference sequences of P. insularum (GenBank accession number: EF514942), P. camena (GenBank accession number: EF515059) and so on.<br><br>CONCLUSIONS: There is a P. canaliculata species in Lincang City of Yunnan Province as well as a high genetic diversity amongst the acquired 3 haplotypes in this study.}, }
@article {pmid29769322, year = {2018}, author = {Krah, A and Zarco-Zavala, M and McMillan, DGG}, title = {Insights into the regulatory function of the ɛ subunit from bacterial F-type ATP synthases: a comparison of structural, biochemical and biophysical data.}, journal = {Open biology}, volume = {8}, number = {5}, pages = {}, pmid = {29769322}, issn = {2046-2441}, mesh = {Adenosine Triphosphate/metabolism ; Bacillaceae/*enzymology/genetics ; Bacillus/enzymology/genetics ; Bacterial Proteins/chemistry/genetics/metabolism ; Binding Sites ; Crystallography, X-Ray ; Escherichia coli/*enzymology/genetics ; Mitochondrial Proton-Translocating ATPases/*chemistry/genetics/*metabolism ; Models, Molecular ; Mutation ; Protein Conformation ; }, abstract = {ATP synthases catalyse the formation of ATP, the most common chemical energy storage unit found in living cells. These enzymes are driven by an electrochemical ion gradient, which allows the catalytic evolution of ATP by a binding change mechanism. Most ATP synthases are capable of catalysing ATP hydrolysis to varying degrees, and to prevent wasteful ATP hydrolysis, bacteria and mitochondria have regulatory mechanisms such as ADP inhibition. Additionally, ɛ subunit inhibition has also been described in three bacterial systems, Escherichia coli, Bacillus PS3 and Caldalkalibacillus thermarum TA2.A1. Previous studies suggest that the ɛ subunit is capable of undergoing an ATP-dependent conformational change from the ATP hydrolytic inhibitory 'extended' conformation to the ATP-induced non-inhibitory 'hairpin' conformation. A recently published crystal structure of the F1 domain of the C. thermarum TA2.A1 F1Fo ATP synthase revealed a mutant ɛ subunit lacking the ability to bind ATP in a hairpin conformation. This is a surprising observation considering it is an organism that performs no ATP hydrolysis in vivo, and appears to challenge the current dogma on the regulatory role of the ɛ subunit. This has prompted a re-examination of present knowledge of the ɛ subunits role in different organisms. Here, we compare published biochemical, biophysical and structural data involving ɛ subunit-mediated ATP hydrolysis regulation in a variety of organisms, concluding that the ɛ subunit from the bacterial F-type ATP synthases is indeed capable of regulating ATP hydrolysis activity in a wide variety of bacteria, making it a potentially valuable drug target, but its exact role is still under debate.}, }
@article {pmid29761268, year = {2018}, author = {Edera, AA and Gandini, CL and Sanchez-Puerta, MV}, title = {Towards a comprehensive picture of C-to-U RNA editing sites in angiosperm mitochondria.}, journal = {Plant molecular biology}, volume = {97}, number = {3}, pages = {215-231}, pmid = {29761268}, issn = {1573-5028}, mesh = {Base Pair Mismatch ; Codon/genetics ; Genes, Plant/genetics ; Genome, Mitochondrial/genetics ; Magnoliopsida/*genetics ; Mitochondria/*genetics ; Phylogeny ; *RNA Editing/genetics ; Thymidine ; Transcriptome/genetics ; }, abstract = {KEY MESSAGE: Our understanding of the dynamic and evolution of RNA editing in angiosperms is in part limited by the few editing sites identified to date. This study identified 10,217 editing sites from 17 diverse angiosperms. Our analyses confirmed the universality of certain features of RNA editing, and offer new evidence behind the loss of editing sites in angiosperms. RNA editing is a post-transcriptional process that substitutes cytidines (C) for uridines (U) in organellar transcripts of angiosperms. These substitutions mostly take place in mitochondrial messenger RNAs at specific positions called editing sites. By means of publicly available RNA-seq data, this study identified 10,217 editing sites in mitochondrial protein-coding genes of 17 diverse angiosperms. Even though other types of mismatches were also identified, we did not find evidence of non-canonical editing processes. The results showed an uneven distribution of editing sites among species, genes, and codon positions. The analyses revealed that editing sites were conserved across angiosperms but there were some species-specific sites. Non-synonymous editing sites were particularly highly conserved (~ 80%) across the plant species and were efficiently edited (80% editing extent). In contrast, editing sites at third codon positions were poorly conserved (~ 30%) and only partially edited (~ 40% editing extent). We found that the loss of editing sites along angiosperm evolution is mainly occurring by replacing editing sites with thymidines, instead of a degradation of the editing recognition motif around editing sites. Consecutive and highly conserved editing sites had been replaced by thymidines as result of retroprocessing, by which edited transcripts are reverse transcribed to cDNA and then integrated into the genome by homologous recombination. This phenomenon was more pronounced in eudicots, and in the gene cox1. These results suggest that retroprocessing is a widespread driving force underlying the loss of editing sites in angiosperm mitochondria.}, }
@article {pmid29760081, year = {2018}, author = {Sharp, NP and Sandell, L and James, CG and Otto, SP}, title = {The genome-wide rate and spectrum of spontaneous mutations differ between haploid and diploid yeast.}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {115}, number = {22}, pages = {E5046-E5055}, pmid = {29760081}, issn = {1091-6490}, mesh = {DNA Breaks, Double-Stranded ; DNA Repair/genetics ; DNA Replication/genetics ; DNA, Fungal/*genetics ; *Diploidy ; Genes, Fungal/genetics ; *Haploidy ; Mitochondria/genetics ; Mutation/*genetics ; Mutation Rate ; Saccharomyces cerevisiae/*genetics ; }, abstract = {By altering the dynamics of DNA replication and repair, alternative ploidy states may experience different rates and types of new mutations, leading to divergent evolutionary outcomes. We report a direct comparison of the genome-wide spectrum of spontaneous mutations arising in haploids and diploids following a mutation-accumulation experiment in the budding yeast Saccharomyces cerevisiae Characterizing the number, types, locations, and effects of thousands of mutations revealed that haploids were more prone to single-nucleotide mutations (SNMs) and mitochondrial mutations, while larger structural changes were more common in diploids. Mutations were more likely to be detrimental in diploids, even after accounting for the large impact of structural changes, contrary to the prediction that mutations would have weaker effects, due to masking, in diploids. Haploidy is expected to reduce the opportunity for conservative DNA repair involving homologous chromosomes, increasing the insertion-deletion rate, but we found little support for this idea. Instead, haploids were more susceptible to SNMs in late-replicating genomic regions, resulting in a ploidy difference in the spectrum of substitutions. In diploids, we detect mutation rate variation among chromosomes in association with centromere location, a finding that is supported by published polymorphism data. Diploids are not simply doubled haploids; instead, our results predict that the spectrum of spontaneous mutations will substantially shape the dynamics of genome evolution in haploid and diploid populations.}, }
@article {pmid29757366, year = {2018}, author = {Dobler, R and Dowling, DK and Morrow, EH and Reinhardt, K}, title = {A systematic review and meta-analysis reveals pervasive effects of germline mitochondrial replacement on components of health.}, journal = {Human reproduction update}, volume = {24}, number = {5}, pages = {519-534}, doi = {10.1093/humupd/dmy018}, pmid = {29757366}, issn = {1460-2369}, mesh = {Animals ; Basal Metabolism/genetics ; Gene Expression Regulation/genetics ; Genetic Variation ; Haplotypes ; Humans ; Mitochondria/*genetics ; Mitochondrial Replacement Therapy/*adverse effects ; Risk Assessment ; }, abstract = {BACKGROUND: Mitochondrial replacement, a form of nuclear transfer, has been proposed as a germline therapy to prevent the transmission of mitochondrial diseases. Mitochondrial replacement therapy has been licensed for clinical application in the UK, and already carried out in other countries, but little is known about negative or unintended effects on the health of offspring born using this technique.<br><br>OBJECTIVE AND RATIONALE: Studies in invertebrate models have used techniques that achieve mitochondrial replacement to create offspring with novel combinations of mitochondrial and nuclear genotype. These have demonstrated that the creation of novel mitochondrial-nuclear interactions can lead to alterations in offspring characteristics, such as development rates, fertility and longevity. However, it is currently unclear whether such interactions could similarly affect the outcomes of vertebrate biomedical studies, which have sought to assess the efficacy of the replacement therapy.<br><br>SEARCH METHODS: This systematic review addresses whether the effects of mitochondrial replacement on offspring characteristics differ in magnitude between biological (conducted on invertebrate models, with an ecological or evolutionary focus) and biomedical studies (conducted on vertebrate models, with a clinical focus). Studies were selected based on a key-word search in 'Web of Science', complemented by backward searches of reviews on the topic of mitochondrial-nuclear (mito-nuclear) interactions. In total, 43 of the resulting 116 publications identified in the search contained reliable data to estimate effect sizes of mitochondrial replacement. We found no evidence of publication bias when examining effect-size estimates across sample sizes.<br><br>OUTCOMES: Mitochondrial replacement consistently altered the phenotype, with significant effects at several levels of organismal performance and health, including gene expression, anatomy, metabolism and life-history. Biomedical and biological studies, while differing in the methods used to achieve mitochondrial replacement, showed only marginally significant differences in effect-size estimates (-0.233 [CI: -0.495 to -0.011]), with larger effect-size estimates in biomedical studies (0.697 [CI: 0.450-0.956]) than biological studies (0.462 [CI: 0.287-0.688]). Humans showed stronger effects than other species. Effects of mitochondrial replacement were also stronger in species with a higher basal metabolic rate. Based on our results, we conducted the first formal risk analysis of mitochondrial replacement, and conservatively estimate negative effects in at least one in every 130 resulting offspring born to the therapy.<br><br>WIDER IMPLICATIONS: Our findings suggest that mitochondrial replacement may routinely affect offspring characteristics across a wide array of animal species, and that such effects are likely to extend to humans. Studies in invertebrate models have confirmed mito-nuclear interactions as the underpinning cause of organismal effects following mitochondrial replacement. This therefore suggests that mito-nuclear interactions are also likely to be contributing to effects seen in biomedical studies, on vertebrate models, whose effect sizes exceeded those of biological studies. Our results advocate the use of safeguards that could offset any negative effects (defining any unintended effect as being negative) mediated by mito-nuclear interactions following mitochondrial replacement in humans, such as mitochondrial genetic matching between donor and recipient. Our results also suggest that further research into the molecular nature of mito-nuclear interactions would be beneficial in refining the clinical application of mitochondrial replacement, and in establishing what degree of variation between donor and patient mitochondrial DNA haplotypes is acceptable to ensure 'haplotype matching'.}, }
@article {pmid29754387, year = {2018}, author = {Zhu, C and Chen, P and Han, Y and Ruan, L}, title = {Low Genetic Diversity and Low Gene Flow Corresponded to a Weak Genetic Structure of Ruddy-Breasted Crake (Porzana fusca) in China.}, journal = {Biochemical genetics}, volume = {56}, number = {6}, pages = {586-617}, doi = {10.1007/s10528-018-9862-9}, pmid = {29754387}, issn = {1573-4927}, support = {NSFC no. 30960052//National Science Foundation of China/ ; no. 31260510//National Science Foundation of China/ ; no. KT201537//Water - resource Department of Jiangxi Province Science and Technological Project/ ; }, mesh = {Animals ; Birds/*genetics ; DNA, Mitochondrial ; *Gene Flow ; *Genetic Structures ; *Genetic Variation ; *Genetics, Population ; Haplotypes ; Microsatellite Repeats ; Mitochondria/genetics ; Phylogeny ; }, abstract = {The Ruddy-breasted Crake (Porzana fusca) is an extremely poorly known species. Although it is not listed as globally endangered, in recent years, with the interference of climate change and human activities, its habitat is rapidly disappearing and its populations have been shrinking. There are two different life history traits for Ruddy-breasted Crake in China, i.e., non-migratory population in the south and migratory population in the north of China. In this study, mitochondrial control sequences and microsatellite datasets of 88 individuals sampled from 8 sites were applied to analyze their genetic diversity, genetic differentiation, and genetic structure. Our results indicated that low genetic diversity and genetic differentiation exit in most populations. The neutrality test suggested significantly negative Fu's Fs value, which, in combination with detection of the mismatch distribution, indicated that population expansion occurred in the interglacier approximately 98,000 years ago, and the time of the most recent common ancestor (TMRCA) was estimated to about 202,705 years ago. Gene flow analysis implied that the gene flow was low, but gene exchange was frequent among adjacent populations. Both phylogenetic and STRUCTURE analyses implied weak genetic structure. In general, the genetic diversity, gene flow, and genetic structure of Ruddy-breasted Crake were low.}, }
@article {pmid29747566, year = {2018}, author = {Oetjens, MT and Martin, A and Veeramah, KR and Kidd, JM}, title = {Analysis of the canid Y-chromosome phylogeny using short-read sequencing data reveals the presence of distinct haplogroups among Neolithic European dogs.}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {350}, pmid = {29747566}, issn = {1471-2164}, support = {R01 GM103961/GM/NIGMS NIH HHS/United States ; R01GM103961//National Institute of General Medical Sciences/ ; }, mesh = {Animals ; Coyotes/classification/*genetics ; DNA, Mitochondrial/genetics ; Dogs/classification/*genetics ; *Evolution, Molecular ; Genetic Variation ; Genome ; *Haplotypes ; Male ; *Phylogeny ; Sequence Analysis, DNA/*methods ; Wolves/classification/*genetics ; *Y Chromosome ; }, abstract = {BACKGROUND: Most genetic analyses of ancient and modern dogs have focused on variation in the autosomes or on the mitochondria. Mitochondrial DNA is more easily obtained from ancient samples than nuclear DNA and mitochondrial analyses have revealed important insights into the evolutionary history of canids. Utilizing a recently published dog Y-chromosome reference, we analyzed Y-chromosome sequence across a diverse collection of canids and determined the Y haplogroup of three ancient European dogs.<br><br>RESULTS: We identified 1121 biallelic Y-chromosome SNVs using whole-genome sequences from 118 canids and defined variants diagnostic to distinct dog Y haplogroups. Similar to that of the mitochondria and previous more limited studies of Y diversity, we observe several deep splits in the Y-chromosome tree which may be the result of retained Y-chromosome diversity which predates dog domestication or post-domestication admixture with wolves. We find that Y-chromosomes from three ancient European dogs (4700-7000 years old) belong to distinct clades.<br><br>CONCLUSIONS: We estimate that the time to the most recent comment ancestor of dog Y haplogroups is 68-151 thousand years ago. Analysis of three Y-chromosomes from the Neolithic confirms long stranding population structure among European dogs.}, }
@article {pmid29743632, year = {2018}, author = {Sinha, S and Bheemsetty, VA and Inamdar, MS}, title = {A double helical motif in OCIAD2 is essential for its localization, interactions and STAT3 activation.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {7362}, pmid = {29743632}, issn = {2045-2322}, abstract = {The Ovarian Carcinoma Immunoreactive Antigen domain (OCIAD) - containing proteins OCIAD1/Asrij and OCIAD2, are implicated in several cancers and neurodegenerative diseases. While Asrij has a conserved role in facilitating STAT3 activation for JAK/STAT signaling, the expression and function of OCIAD2 in non-cancerous contexts remains unknown. Here, we report that ociad2 neighbors ociad1/asrij in most vertebrate genomes, and the two genes likely arose by tandem gene duplication, probably somewhere between the Ordovician and Silurian eras. We show that ociad2 expression is higher in the mouse kidney, liver and brain relative to other tissues. OCIAD2 localizes to early endosomes and mitochondria, and interacts with Asrij and STAT3. Knockdown and overexpression studies showed that OCIAD2 is essential for STAT3 activation and cell migration, which could contribute to its role in tumor metastasis. Structure prediction programs, protein disruption studies, biochemical and functional assays revealed a double helical motif in the OCIA domain that is necessary and sufficient for its localization, interactions and STAT3 activation. Given the importance of JAK/STAT signaling in development and disease, our studies shed light on the evolution and conserved function of the OCIA domain in regulating this pathway and will be critical for understanding this clinically important protein family.}, }
@article {pmid29738865, year = {2018}, author = {Feng, S and Stejskal, V and Wang, Y and Li, Z}, title = {The mitochondrial genomes of the barklice, Lepinotus reticulatus and Dorypteryx domestica (Psocodea: Trogiomorpha): Insight into phylogeny of the order Psocodea.}, journal = {International journal of biological macromolecules}, volume = {116}, number = {}, pages = {247-254}, doi = {10.1016/j.ijbiomac.2018.05.021}, pmid = {29738865}, issn = {1879-0003}, mesh = {Animals ; Base Sequence ; Evolution, Molecular ; Gene Order/genetics ; Genome, Mitochondrial/*genetics ; Insecta/*genetics ; Mitochondria/*genetics ; Phylogeny ; Polymorphism, Single Nucleotide/genetics ; Sequence Analysis, DNA/methods ; }, abstract = {The order Psocodea which has incorporated the two former orders Psocoptera (barklice and booklice) and Phthiraptera (parasitic lice) attracts much attention for its unusual mitochondrial (mt) genome rearrangements. Available phylogenetic analysis for Psocodea is subjected to partial taxa and a complete one is needed. To further explore the genome rearrangement and phylogeny in Psocodea, we sequenced the mt genomes of two barklice, Lepinotus reticulatus (collected from China) and Dorypteryx domestica (collected from Czech Republic). Both of newly sequenced barklice had typical one-chromosome mt genomes and the same mt gene arrangement with the reported Lepidopsocidae sp. The mt genomes of L. reticulatus and D. domestica contained 37 genes typical of bilateral animals. In contrast with the recent report mt genome of D. domestica, our strain was found with many single nucleotide polymorphisms in intra-specific difference. Phylogenetic relationships were inferred from all available mt genomes of Psocodea data using Maximum Likelihood and Bayesian methods. The mt genome of L. reticulatus is the first representative with complete sequences of the family Trogiidae and our D. domestica data enriched the family Psyllipsocidae, which will contribute to the further study of mt gene rearrangement and phylogeny of Psocodea.}, }
@article {pmid29731304, year = {2018}, author = {Maclean, AE and Hertle, AP and Ligas, J and Bock, R and Balk, J and Meyer, EH}, title = {Absence of Complex I Is Associated with Diminished Respiratory Chain Function in European Mistletoe.}, journal = {Current biology : CB}, volume = {28}, number = {10}, pages = {1614-1619.e3}, doi = {10.1016/j.cub.2018.03.036}, pmid = {29731304}, issn = {1879-0445}, abstract = {Parasitism is a life history strategy found across all domains of life whereby nutrition is obtained from a host. It is often associated with reductive evolution of the genome, including loss of genes from the organellar genomes [1, 2]. In some unicellular parasites, the mitochondrial genome (mitogenome) has been lost entirely, with far-reaching consequences for the physiology of the organism [3, 4]. Recently, mitogenome sequences of several species of the hemiparasitic plant mistletoe (Viscum sp.) have been reported [5, 6], revealing a striking loss of genes not seen in any other multicellular eukaryotes. In particular, the nad genes encoding subunits of respiratory complex I are all absent and other protein-coding genes are also lost or highly diverged in sequence, raising the question what remains of the respiratory complexes and mitochondrial functions. Here we show that oxidative phosphorylation (OXPHOS) in European mistletoe, Viscum album, is highly diminished. Complex I activity and protein subunits of complex I could not be detected. The levels of complex IV and ATP synthase were at least 5-fold lower than in the non-parasitic model plant Arabidopsis thaliana, whereas alternative dehydrogenases and oxidases were higher in abundance. Carbon flux analysis indicates that cytosolic reactions including glycolysis are greater contributors to ATP synthesis than the mitochondrial tricarboxylic acid (TCA) cycle. Our results describe the extreme adjustments in mitochondrial functions of the first reported multicellular eukaryote without complex I.}, }
@article {pmid29730527, year = {2018}, author = {van der Hoek, MD and Madsen, O and Keijer, J and van der Leij, FR}, title = {Evolutionary analysis of the carnitine- and choline acyltransferases suggests distinct evolution of CPT2 versus CPT1 and related variants.}, journal = {Biochimica et biophysica acta. Molecular and cell biology of lipids}, volume = {1863}, number = {8}, pages = {909-918}, doi = {10.1016/j.bbalip.2018.05.001}, pmid = {29730527}, issn = {1388-1981}, mesh = {Animals ; Caenorhabditis elegans/enzymology/genetics ; Carnitine/metabolism ; Carnitine O-Palmitoyltransferase/*genetics/metabolism ; Choline/metabolism ; Drosophila/enzymology/genetics ; *Evolution, Molecular ; Exons/genetics ; Introns/genetics ; Isoenzymes/genetics/metabolism ; Mitochondria/*enzymology ; *Phylogeny ; Yeasts/enzymology/genetics ; }, abstract = {Carnitine/choline acyltransferases play diverse roles in energy metabolism and neuronal signalling. Our knowledge of their evolutionary relationships, important for functional understanding, is incomplete. Therefore, we aimed to determine the evolutionary relationships of these eukaryotic transferases. We performed extensive phylogenetic and intron position analyses. We found that mammalian intramitochondrial CPT2 is most closely related to cytosolic yeast carnitine transferases (Sc-YAT1 and 2), whereas the other members of the family are related to intraorganellar yeast Sc-CAT2. Therefore, the cytosolically active CPT1 more closely resembles intramitochondrial ancestors than CPT2. The choline acetyltransferase is closely related to carnitine acetyltransferase and shows lower evolutionary rates than long chain acyltransferases. In the CPT1 family several duplications occurred during animal radiation, leading to the isoforms CPT1A, CPT1B and CPT1C. In addition, we found five CPT1-like genes in Caenorhabditis elegans that strongly group to the CPT1 family. The long branch leading to mammalian brain isoform CPT1C suggests that either strong positive or relaxed evolution has taken place on this node. The presented evolutionary delineation of carnitine/choline acyltransferases adds to current knowledge on their functions and provides tangible leads for further experimental research.}, }
@article {pmid29728774, year = {2018}, author = {Gong, S and Vamberger, M and Auer, M and Praschag, P and Fritz, U}, title = {Millennium-old farm breeding of Chinese softshell turtles (Pelodiscus spp.) results in massive erosion of biodiversity.}, journal = {Die Naturwissenschaften}, volume = {105}, number = {5-6}, pages = {34}, pmid = {29728774}, issn = {1432-1904}, support = {31471966//National Natural Science Foundation of China/ ; }, mesh = {Animals ; *Biodiversity ; *Breeding ; China ; DNA, Mitochondrial/genetics ; Microsatellite Repeats/genetics ; Phylogeny ; Turtles/*classification/*genetics ; }, abstract = {Chinese softshell turtles (Pelodiscus spp.) are widely distributed, ranging from the Amur and Ussuri Rivers in the Russian Far East through the Korean Peninsula, Japan, and eastern, central, and southern China to southern Vietnam. In East and Southeast Asia, Chinese softshell turtles are traditionally exploited for food and have been farm-bred in China since the Spring and Autumn Period, more than 2400 years ago. Currently, the annual production of Pelodiscus amounts to 340,000 t in China alone. Using mitochondrial DNA (2428 bp) and five nuclear loci (3704 bp), we examined broad sampling of wild and farm-bred Pelodiscus to infer genetic and taxonomic differentiation. We discovered four previously unknown mitochondrial lineages, all from China. One lineage from Jiangxi is deeply divergent and sister to the mitochondrial lineage of Pelodiscus axenaria. The nuclear loci supported species status for P. axenaria and the new lineage from Jiangxi. Pelodiscus maackii and P. parviformis, both harboring distinct mitochondrial lineages, were not differentiated from P. sinensis in the studied nuclear markers. The same is true for two new mitochondrial lineages from Zhejiang, China, represented by only one individual each, and another new lineage from Anhui, Guangdong, Jiangxi and Zhejiang, China. However, Vietnamese turtles yielding a mitochondrial lineage clustering within P. sinensis were distinct in nuclear markers, suggesting that these populations could represent another unknown species with introgressed mitochondria. Its species status is also supported by the syntopic occurrence with P. sinensis in northern Vietnam and by morphology. In addition, we confirmed sympatry of P. axenaria and P. parviformis in Guangxi, China, and found evidence for sympatry of P. sinensis and the new putative species from Jiangxi, China. We also discovered evidence for hybridization in turtle farms and for the occurrence of alien lineages in the wild (Zhejiang, China), highlighting the risk of genetic pollution of native stock. In the face of the large-scale breeding of Pelodiscus, we claim that the long-term survival of distinct genetic lineages and species can only be assured when an upscale market segment for pure-bred softshell turtles is established, making the breeding of pure lineages lucrative for turtle farms. Our findings underline that the diversity of Pelodiscus is currently underestimated and threatened by anthropogenic admixture. We recommend mass screening of genetic and morphological variation of Chinese softshell turtles as a first step to understand and preserve their diversity.}, }
@article {pmid29724860, year = {2018}, author = {Garg, SG and Martin, WF}, title = {Asking endosymbionts to do an enzyme's job.}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {115}, number = {20}, pages = {E4543-E4544}, pmid = {29724860}, issn = {1091-6490}, mesh = {*Biological Evolution ; Enzymes/*metabolism ; Mitochondria ; *Symbiosis ; }, }
@article {pmid29723685, year = {2018}, author = {Samuilov, VD and Kiselevsky, DB and Oleskin, AV}, title = {Mitochondria-targeted quinones suppress the generation of reactive oxygen species, programmed cell death and senescence in plants.}, journal = {Mitochondrion}, volume = {}, number = {}, pages = {}, doi = {10.1016/j.mito.2018.04.008}, pmid = {29723685}, issn = {1872-8278}, abstract = {This work focuses on the effect of mitochondria-targeted quinones (SkQs) on plants. SkQs with antioxidant properties are accumulated in the mitochondria of pea cells and suppress the generation of reactive oxygen species. At nanomolar concentrations, SkQs prevented the death of pea leaf epidermal or guard cells caused by chitosan, bacterial lipopolysaccharide or KCN. The protective effect of SkQs was removed by a protonophoric uncoupler. SkQs at micromolar concentrations inhibited the O2 evolution by illuminated chloroplasts and stimulated the respiration of mitochondria. SkQs slowed down the senescence and the death of Arabidopsis thaliana leaves and improved the wheat crop structure.}, }
@article {pmid29722901, year = {2018}, author = {McManus, HA and Fučíková, K and Lewis, PO and Lewis, LA and Karol, KG}, title = {Organellar phylogenomics inform systematics in the green algal family Hydrodictyaceae (Chlorophyceae) and provide clues to the complex evolutionary history of plastid genomes in the green algal tree of life.}, journal = {American journal of botany}, volume = {105}, number = {3}, pages = {315-329}, doi = {10.1002/ajb2.1066}, pmid = {29722901}, issn = {1537-2197}, mesh = {Base Sequence ; Chlorophyceae/*genetics ; Chlorophyta/*genetics ; Chloroplasts ; DNA, Chloroplast/analysis ; DNA, Mitochondrial/analysis ; *Evolution, Molecular ; Genes, Plant ; *Genome, Mitochondrial ; Genome, Plant ; *Genome, Plastid ; Genomics ; Mitochondria ; Organelles/*genetics ; *Phylogeny ; }, abstract = {PREMISE OF THE STUDY: Phylogenomic analyses across the green algae are resolving relationships at the class, order, and family levels and highlighting dynamic patterns of evolution in organellar genomes. Here we present a within-family phylogenomic study to resolve genera and species relationships in the family Hydrodictyaceae (Chlorophyceae), for which poor resolution in previous phylogenetic studies, along with divergent morphological traits, have precluded taxonomic revisions.<br><br>METHODS: Complete plastome sequences and mitochondrial protein-coding gene sequences were acquired from representatives of the Hydrodictyaceae using next-generation sequencing methods. Plastomes were characterized, and gene order and content were compared with plastomes spanning the Sphaeropleales. Single-gene and concatenated-gene phylogenetic analyses of plastid and mitochondrial genes were performed.<br><br>KEY RESULTS: The Hydrodictyaceae contain the largest sphaeroplealean plastomes thus far fully sequenced. Conservation of plastome gene order within Hydrodictyaceae is striking compared with more dynamic patterns revealed across Sphaeropleales. Phylogenetic analyses resolve Hydrodictyon sister to a monophyletic Pediastrum, though the morphologically distinct P. angulosum and P. duplex continue to be polyphyletic. Analyses of plastid data supported the neochloridacean genus Chlorotetraëdron as sister to Hydrodictyaceae, while conflicting signal was found in the mitochondrial data.<br><br>CONCLUSIONS: A phylogenomic approach resolved within-family relationships not obtainable with previous phylogenetic analyses. Denser taxon sampling across Sphaeropleales is necessary to capture patterns in plastome evolution, and further taxa and studies are needed to fully resolve the sister lineage to Hydrodictyaceae and polyphyly of Pediastrum angulosum and P. duplex.}, }
@article {pmid29720079, year = {2018}, author = {Dufresnes, C and Lymberakis, P and Kornilios, P and Savary, R and Perrin, N and Stöck, M}, title = {Phylogeography of Aegean green toads (Bufo viridis subgroup): continental hybrid swarm vs. insular diversification with discovery of a new island endemic.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {67}, pmid = {29720079}, issn = {1471-2148}, support = {STO 493/2-2//Deutsche Forschungsgemeinschaft/International ; P2LAP3_171818//Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung/International ; }, mesh = {Animals ; Base Sequence ; *Biodiversity ; Bufonidae/*classification ; Cell Nucleus/genetics ; DNA, Mitochondrial/genetics ; Gene Flow ; Genetic Drift ; Genetics, Population ; Genome ; Greece ; *Islands ; Likelihood Functions ; Mitochondria/genetics ; Phylogeny ; *Phylogeography ; Reproductive Isolation ; Sequence Analysis, DNA ; }, abstract = {BACKGROUND: Debated aspects in speciation research concern the amount of gene flow between incipient species under secondary contact and the modes by which post-zygotic isolation accumulates. Secondary contact zones of allopatric lineages, involving varying levels of divergence, provide natural settings for comparative studies, for which the Aegean (Eastern Mediterranean) geography offers unique scenarios. In Palearctic green toads (Bufo viridis subgroup or Bufotes), Plio-Pleistocene (~ 2.6 Mya) diverged species show a sharp transition without contemporary gene flow, while younger lineages, diverged in the Lower-Pleistocene (~ 1.9 Mya), admix over tens of kilometers. Here, we conducted a fine-scale multilocus phylogeographic analysis of continental and insular green toads from the Aegean, where a third pair of taxa, involving Mid-Pleistocene diverged (~ 1.5 Mya) mitochondrial lineages, earlier tentatively named viridis and variabilis, (co-)occurs.<br><br>RESULTS: We discovered a new lineage, endemic to Naxos (Central Cyclades), while coastal islands and Crete feature weak genetic differentiation from the continent. In continental Greece, both lineages, viridis and variabilis, form a hybrid swarm, involving massive mitochondrial and nuclear admixture over hundreds of kilometers, without obvious selection against hybrids.<br><br>CONCLUSIONS: The genetic signatures of insular Aegean toads appear governed by bathymetry and Quaternary sea level changes, resulting in long-term isolation (Central Cyclades: Naxos) and recent land-bridges (coastal islands). Conversely, Crete has been isolated since the end of the Messinian salinity crisis (5.3 My) and Cretan populations thus likely result from human-mediated colonization, at least since Antiquity, from Peloponnese and Anatolia. Comparisons of green toad hybrid zones support the idea that post-zygotic hybrid incompatibilities accumulate gradually over the genome. In this radiation, only one million years of divergence separate a scenario of complete reproductive isolation, from a secondary contact resulting in near panmixia.}, }
@article {pmid29718949, year = {2018}, author = {Lv, C and Li, Q and Kong, L}, title = {Comparative analyses of the complete mitochondrial genomes of Dosinia clams and their phylogenetic position within Veneridae.}, journal = {PloS one}, volume = {13}, number = {5}, pages = {e0196466}, pmid = {29718949}, issn = {1932-6203}, mesh = {Animals ; Base Composition/genetics ; Base Sequence/genetics ; Bayes Theorem ; Bivalvia/*genetics ; Genome, Mitochondrial/*genetics ; Mitochondria/*genetics ; Phylogeny ; RNA, Ribosomal/genetics ; RNA, Transfer/genetics ; Sequence Analysis, DNA ; }, abstract = {Mitochondrial genomes have proved to be a powerful tool in resolving phylogenetic relationship. In order to understand the mitogenome characteristics and phylogenetic position of the genus Dosinia, we sequenced the complete mitochondrial genomes of Dosinia altior and Dosinia troscheli (Bivalvia: Veneridae), compared them with that of Dosinia japonica and established a phylogenetic tree for Veneridae. The mitogenomes of D. altior (17,536 bp) and D. troscheli (17,229 bp) are the two smallest in Veneridae, which include 13 protein-coding genes, 2 ribosomal RNA genes, 22 tRNA genes, and non-coding regions. The mitogenomes of the Dosinia species are similar in size, gene content, AT content, AT- and GC- skews, and gene arrangement. The phylogenetic relationships of family Veneridae were established based on 12 concatenated protein-coding genes using maximum likelihood and Bayesian analyses, which supported that Dosininae and Meretricinae have a closer relationship, with Tapetinae being the sister taxon. The information obtained in this study will contribute to further understanding of the molecular features of bivalve mitogenomes and the evolutionary history of the genus Dosinia.}, }
@article {pmid29706933, year = {2018}, author = {Goetzman, ES and Prochownik, EV}, title = {The Role for Myc in Coordinating Glycolysis, Oxidative Phosphorylation, Glutaminolysis, and Fatty Acid Metabolism in Normal and Neoplastic Tissues.}, journal = {Frontiers in endocrinology}, volume = {9}, number = {}, pages = {129}, pmid = {29706933}, issn = {1664-2392}, support = {R01 CA174713/CA/NCI NIH HHS/United States ; R01 DK090242/DK/NIDDK NIH HHS/United States ; }, abstract = {That cancer cells show patterns of metabolism different from normal cells has been known for over 50 years. Yet, it is only in the past decade or so that an appreciation of the benefits of these changes has begun to emerge. Altered cancer cell metabolism was initially attributed to defective mitochondria. However, we now realize that most cancers do not have mitochondrial mutations and that normal cells can transiently adopt cancer-like metabolism during periods of rapid proliferation. Indeed, an encompassing, albeit somewhat simplified, conceptual framework to explain both normal and cancer cell metabolism rests on several simple premises. First, the metabolic pathways used by cancer cells and their normal counterparts are the same. Second, normal quiescent cells use their metabolic pathways and the energy they generate largely to maintain cellular health and organelle turnover and, in some cases, to provide secreted products necessary for the survival of the intact organism. By contrast, undifferentiated cancer cells minimize the latter functions and devote their energy to producing the anabolic substrates necessary to maintain high rates of unremitting cellular proliferation. Third, as a result of the uncontrolled proliferation of cancer cells, a larger fraction of the metabolic intermediates normally used by quiescent cells purely as a source of energy are instead channeled into competing proliferation-focused and energy-consuming anabolic pathways. Fourth, cancer cell clones with the most plastic and rapidly adaptable metabolism will eventually outcompete their less well-adapted brethren during tumor progression and evolution. This attribute becomes increasingly important as tumors grow and as their individual cells compete in a constantly changing and inimical environment marked by nutrient, oxygen, and growth factor deficits. Here, we review some of the metabolic pathways whose importance has gained center stage for tumor growth, particularly those under the control of the c-Myc (Myc) oncoprotein. We discuss how these pathways differ functionally between quiescent and proliferating normal cells, how they are kidnapped and corrupted during the course of transformation, and consider potential therapeutic strategies that take advantage of common features of neoplastic and metabolic disorders.}, }
@article {pmid29703131, year = {2018}, author = {Arafat, H and Alamaru, A and Gissi, C and Huchon, D}, title = {Extensive mitochondrial gene rearrangements in Ctenophora: insights from benthic Platyctenida.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {65}, pmid = {29703131}, issn = {1471-2148}, support = {161/15//Israel Science Foundation/International ; }, mesh = {Animals ; Biological Evolution ; Conserved Sequence/genetics ; Ctenophora/*genetics ; DNA, Mitochondrial/genetics ; Gene Order ; *Gene Rearrangement ; *Genes, Mitochondrial ; Genome, Mitochondrial ; Mitochondria/genetics ; Molecular Sequence Annotation ; Open Reading Frames/genetics ; Phylogeny ; RNA, Ribosomal/genetics ; }, abstract = {BACKGROUND: Complete mitochondrial (mt) genomes have been sequenced for thousands of animals and represent a molecule of choice for many evolutionary studies. Nevertheless, some animal groups have remained under-sampled. Ctenophora (comb jellies) is one such example, with only two complete mt sequences determined hitherto for this phylum, which encompasses ca. 150-200 described species. This lack of data derives from the extremely fast mt evolutionary rate in this lineage, complicating primer design and DNA amplification. Indeed, in the two ctenophore mt genomes sequenced to date, i.e. those of Mnemiopsis leidyi (order Lobata) and Pleurobrachia bachei (order Cydippida), both rRNA and protein coding genes exhibit an extraordinary size reduction and have highly derived sequences. Additionally, all tRNAs, and the atp6 and atp8 genes are absent. In order to determine whether these characteristics are shared by other ctenophores, we obtained the complete mt genomes of three benthic ctenophores belonging to the so far unsampled order of Platyctenida: Coeloplana loyai, Coeloplana yulianicorum and Vallicula multiformis.<br><br>RESULTS: The mt genomes of benthic ctenophores reveal the same peculiarities found in Mnemiopsis and Pleurobrachia, demonstrating that the fast evolutionary rate is a general trait of the ctenophore mt genomes. Our results also indicate that this high evolutionary rate not only affects the nucleotide substitution but also gene rearrangements. Indeed, gene order was highly rearranged among representatives of the different taxonomic orders in which it was close to random, but also quite variable within Platyctenida, in which the genera Coeloplana and Vallicula share only four conserved synteny blocks. However, the two congeneric Coeloplana species display exactly the same gene order. Because of the extreme evolutionary rate, our phylogenetic analyses were unable to resolve the phylogenetic position of ctenophores within metazoans or the relationships among the different Ctenophora orders. Comparative sequence-analyses allowed us to correct the annotation of the Pleurobrachia mt genome, confirming the absence of tRNAs, the presence of both rRNA genes, and the existence of a reassignment of codon TGA from tryptophan to serine for this species.<br><br>CONCLUSIONS: Since Platyctenida is an early diverging lineage among Ctenophora, our findings suggest that the mt traits described above are ancestral characteristics of this phylum.}, }
@article {pmid29698456, year = {2018}, author = {Peña-Diaz, P and Mach, J and Kriegová, E and Poliak, P and Tachezy, J and Lukeš, J}, title = {Trypanosomal mitochondrial intermediate peptidase does not behave as a classical mitochondrial processing peptidase.}, journal = {PloS one}, volume = {13}, number = {4}, pages = {e0196474}, pmid = {29698456}, issn = {1932-6203}, mesh = {Amino Acid Sequence ; Down-Regulation ; Electron Transport Complex IV/metabolism ; Metalloendopeptidases/antagonists &amp; inhibitors/classification/genetics/*metabolism ; Microscopy, Fluorescence ; Mitochondria/*enzymology ; Phylogeny ; Protein Subunits/antagonists &amp; inhibitors/genetics/metabolism ; RNA Interference ; RNA, Small Interfering/metabolism ; Substrate Specificity ; Trypanosoma brucei brucei/*metabolism ; }, abstract = {Upon their translocation into the mitochondrial matrix, the N-terminal pre-sequence of nuclear-encoded proteins undergoes cleavage by mitochondrial processing peptidases. Some proteins require more than a single processing step, which involves several peptidases. Down-regulation of the putative Trypanosoma brucei mitochondrial intermediate peptidase (MIP) homolog by RNAi renders the cells unable to grow after 48 hours of induction. Ablation of MIP results in the accumulation of the precursor of the trypanosomatid-specific trCOIV protein, the largest nuclear-encoded subunit of the cytochrome c oxidase complex in this flagellate. However, the trCOIV precursor of the same size accumulates also in trypanosomes in which either alpha or beta subunits of the mitochondrial processing peptidase (MPP) have been depleted. Using a chimeric protein that consists of the N-terminal sequence of a putative subunit of respiratory complex I fused to a yellow fluorescent protein, we assessed the accumulation of the precursor protein in trypanosomes, in which RNAi was induced against the alpha or beta subunits of MPP or MIP. The observed accumulation of precursors indicates MIP depletion affects the activity of the cannonical MPP, or at least one of its subunits.}, }
@article {pmid29697049, year = {2018}, author = {Stairs, CW and Eme, L and Muñoz-Gómez, SA and Cohen, A and Dellaire, G and Shepherd, JN and Fawcett, JP and Roger, AJ}, title = {Microbial eukaryotes have adapted to hypoxia by horizontal acquisitions of a gene involved in rhodoquinone biosynthesis.}, journal = {eLife}, volume = {7}, number = {}, pages = {}, pmid = {29697049}, issn = {2050-084X}, support = {MOP 341174//CIHR/Canada ; MOP 142349//CIHR/Canada ; R15 GM096398/GM/NIGMS NIH HHS/United States ; 1R15GM096398-01/NH/NIH HHS/United States ; }, abstract = {Under hypoxic conditions, some organisms use an electron transport chain consisting of only complex I and II (CII) to generate the proton gradient essential for ATP production. In these cases, CII functions as a fumarate reductase that accepts electrons from a low electron potential quinol, rhodoquinol (RQ). To clarify the origins of RQ-mediated fumarate reduction in eukaryotes, we investigated the origin and function of rquA, a gene encoding an RQ biosynthetic enzyme. RquA is very patchily distributed across eukaryotes and bacteria adapted to hypoxia. Phylogenetic analyses suggest lateral gene transfer (LGT) of rquA from bacteria to eukaryotes occurred at least twice and the gene was transferred multiple times amongst protists. We demonstrate that RquA functions in the mitochondrion-related organelles of the anaerobic protist Pygsuia and is correlated with the presence of RQ. These analyses reveal the role of gene transfer in the evolutionary remodeling of mitochondria in adaptation to hypoxia.}, }
@article {pmid29695865, year = {2018}, author = {Martijn, J and Vosseberg, J and Guy, L and Offre, P and Ettema, TJG}, title = {Deep mitochondrial origin outside the sampled alphaproteobacteria.}, journal = {Nature}, volume = {557}, number = {7703}, pages = {101-105}, doi = {10.1038/s41586-018-0059-5}, pmid = {29695865}, issn = {1476-4687}, mesh = {Alphaproteobacteria/*cytology/*genetics ; Atlantic Ocean ; Genome, Bacterial/genetics ; Genomics ; Metagenome/genetics ; Mitochondria/*genetics/*metabolism ; Pacific Ocean ; *Phylogeny ; }, abstract = {Mitochondria are ATP-generating organelles, the endosymbiotic origin of which was a key event in the evolution of eukaryotic cells 1 . Despite strong phylogenetic evidence that mitochondria had an alphaproteobacterial ancestry 2 , efforts to pinpoint their closest relatives among sampled alphaproteobacteria have generated conflicting results, complicating detailed inferences about the identity and nature of the mitochondrial ancestor. While most studies support the idea that mitochondria evolved from an ancestor related to Rickettsiales3-9, an order that includes several host-associated pathogenic and endosymbiotic lineages10,11, others have suggested that mitochondria evolved from a free-living group12-14. Here we re-evaluate the phylogenetic placement of mitochondria. We used genome-resolved binning of oceanic metagenome datasets and increased the genomic sampling of Alphaproteobacteria with twelve divergent clades, and one clade representing a sister group to all Alphaproteobacteria. Subsequent phylogenomic analyses that specifically address long branch attraction and compositional bias artefacts suggest that mitochondria did not evolve from Rickettsiales or any other currently recognized alphaproteobacterial lineage. Rather, our analyses indicate that mitochondria evolved from a proteobacterial lineage that branched off before the divergence of all sampled alphaproteobacteria. In light of this new result, previous hypotheses on the nature of the mitochondrial ancestor6,15,16 should be re-evaluated.}, }
@article {pmid29689791, year = {2018}, author = {Sadasivan, K and Ramesh, MB and Palot, MJ and Ambekar, M and Mirza, ZA}, title = {A new species of fan-throated lizard of the genus Sitana Cuvier, 1829 from coastal Kerala, southern India.}, journal = {Zootaxa}, volume = {4374}, number = {4}, pages = {545-564}, doi = {10.11646/zootaxa.4374.4.5}, pmid = {29689791}, issn = {1175-5334}, mesh = {Animals ; India ; *Lizards ; Mitochondria ; Phylogeny ; }, abstract = {We here describe Sitana attenboroughii sp. nov., a new species of fan-throated lizard of the genus Sitana Cuvier, 1829 from coastal Kerala in southern India. The new species morphologically is closer to Sitana visiri Deepak, 2016 (in Deepak et al. 2016a), however, differs in having higher numbers of ventral scales and a comparatively short but richly colored dewlap. Genetically the new species shows affinity to Sitana marudhamneydhal Deepak, Khandekar, Varma Chaitanya, 2016 from which it differs in an uncorrected pairwise sequence divergence of 2.2% for a fragment of mitochondrial Nicotinamide adenine dinucleotide dehydrogenase (NADH) subunit 2 gene.}, }
@article {pmid29678141, year = {2018}, author = {Beltrán-López, RG and Domínguez-Domínguez, O and Pérez-Rodríguez, R and Piller, K and Doadrio, I}, title = {Evolving in the highlands: the case of the Neotropical Lerma live-bearing Poeciliopsis infans (Woolman, 1894) (Cyprinodontiformes: Poeciliidae) in Central Mexico.}, journal = {BMC evolutionary biology}, volume = {18}, number = {1}, pages = {56}, pmid = {29678141}, issn = {1471-2148}, mesh = {Animals ; Bayes Theorem ; *Biological Evolution ; Climate ; Cyprinodontiformes/genetics/*physiology ; Cytochromes b/genetics ; DNA, Mitochondrial/genetics ; *Ecosystem ; Fresh Water ; Genes, Mitochondrial ; Genetic Variation ; Genetics, Population ; Geography ; Haplotypes/genetics ; Mexico ; Mitochondria/genetics ; Phylogeny ; Species Specificity ; Time Factors ; *Tropical Climate ; }, abstract = {BACKGROUND: Volcanic and tectonic activities in conjunction with Quaternary climate are the main events that shaped the geographical distribution of genetic variation of many lineages. Poeciliopsis infans is the only poeciliid species that was able to colonize the temperate highlands of central Mexico. We inferred the phylogenetic relationships, biogeographic history, and historical demography in the widespread Neotropical species P. infans and correlated this with geological events and the Quaternary glacial-interglacial climate in the highlands of central Mexico, using the mitochondrial genes Cytochrome b and Cytochrome oxidase I and two nuclear loci, Rhodopsin and ribosomal protein S7.<br><br>RESULTS: Populations of P. infans were recovered in two well-differentiated clades. The maximum genetic distances between the two clades were 3.3% for cytb, and 1.9% for coxI. The divergence of the two clades occurred ca. 2.83 Myr. Ancestral area reconstruction revealed a complex biogeographical history for P. infans. The Bayesian Skyline Plot showed a demographic decline, although more visible for clade A, and more recently showed a population expansion in the last 0.025 Myr. Finally, the habitat suitability modelling showed that during the LIG, clade B had more areas with high probabilities of presence in comparison to clade A, whereas for the LGM, clade A showed more areas with high probabilities of presence in comparisons to clade B.<br><br>CONCLUSIONS: Poeciliopsis infans has had a complex evolutionary and biogeographic history, which, as in other co-distributed freshwater fishes, seems to be linked to the volcanic and tectonic activities during the Pliocene or early Pleistocene. Populations of P. infans distributed in lowlands showed a higher level of genetic diversity than populations distributed in highlands, which could be linked to more stable and higher temperatures in lowland areas. The fluctuations in population size through time are in agreement with the continuous fluctuations of the climate of central Mexico.}, }
@article {pmid29665772, year = {2018}, author = {Padilla-Jacobo, G and Cano-Camacho, H and López-Zavala, R and Cornejo-Pérez, ME and Zavala-Páramo, MG}, title = {Evolutionary history of Mexican domesticated and wild Meleagris gallopavo.}, journal = {Genetics, selection, evolution : GSE}, volume = {50}, number = {1}, pages = {19}, pmid = {29665772}, issn = {1297-9686}, support = {Scholarship No. 359650//Consejo Nacional de Ciencia y Tecnología/International ; Scholarship//Consejo Nacional de Ciencia y Tecnología/International ; 2004-C01-201//Consejo Nacional de Ciencia y Tecnología-SAGARPA (MX)/International ; 2009-05-115938//Fondos Mixtos Consejo Nacional de Ciencia y Tecnología Gobierno del Estado de Michoacán (MX)/International ; }, mesh = {Animals ; Animals, Domestic/*genetics ; Animals, Wild/genetics ; Canada ; DNA, Mitochondrial/genetics ; Evolution, Molecular ; Genetic Variation ; Guatemala ; Haplotypes ; Mexico ; Mitochondria/*genetics ; Phylogeny ; Sequence Analysis, DNA/*veterinary ; Turkeys/classification/*genetics ; }, abstract = {BACKGROUND: The distribution of the wild turkey (Meleagris gallopavo) extends from Mexico to southeastern Canada and to the eastern and southern regions of the USA. Six subspecies have been described based on morphological characteristics and/or geographical variations in wild and domesticated populations. In this paper, based on DNA sequence data from the mitochondrial D-loop, we investigated the genetic diversity and structure, genealogical relationships, divergence time and demographic history of M. gallopavo populations including domesticated individuals.<br><br>RESULTS: Analyses of 612 wild and domesticated turkey mitochondrial D-loop sequences, including 187 that were collected for this study and 425 from databases, revealed 64 haplotypes with few mutations, some of which are shared between domesticated and wild turkeys. We found a high level of haplotype and nucleotide diversity, which suggests that the total population of this species is large and stable with an old evolutionary history. The results of genetic differentiation, haplotype network, and genealogical relationships analyses revealed three main genetic groups within the species: mexicana as a population relict (C1), merriami (C2), and mexicana/intermedia/silvestris/osceola (C3). Haplotypes detected in domesticated turkeys belong to group C3. Estimates of divergence times agree with range expansion and diversification events of the relict population of M. gallopavo in northwestern Mexico during the Pliocene-Pleistocene and Pleistocene-Holocene boundaries. Demographic reconstruction showed that an expansion of the population occurred 110,000 to 130,000 years ago (Kya), followed by a stable period 100 Kya and finally a decline ~ 10 Kya (Pleistocene-Holocene boundary). In Mexico, the Trans-Mexican Volcanic Belt may be responsible for the range expansion of the C3 group. Two haplotypes with different divergence times, MGMDgoB/MICH1 and MICH2, are dominant in domesticated and commercial turkeys.<br><br>CONCLUSIONS: During the Pleistocene, a large and stable population of M. gallopavo covered a wide geographic distribution from the north to the center of America (USA and Mexico). The mexicana, merriami, and mexicana/intermedia/silvestris/osceola genetic groups originated after divergence and range expansion from northwestern Mexico during the Pliocene-Pleistocene and Pleistocene-Holocene boundaries. Old and new maternal lines of the mexicana/intermedia/silvestris/osceola genetic group were distributed within the Trans-Mexican Volcanic Belt where individuals were captured for domestication. Two haplotypes are the main founder maternal lines of domesticated turkeys.}, }
@article {pmid29664320, year = {2018}, author = {Nakano, M}, title = {16S rRNA Gene Primer Validation for Bacterial Diversity Analysis of Vegetable Products.}, journal = {Journal of food protection}, volume = {81}, number = {5}, pages = {848-859}, doi = {10.4315/0362-028X.JFP-17-346}, pmid = {29664320}, issn = {1944-9097}, abstract = {High-throughput sequencing of the 16S rRNA gene enhances understanding of microbial diversity from complex environmental samples. The 16S rRNA gene is currently the most important target in bacterial evolution and ecology studies, particularly for determination of phylogenetic relationships among taxa, exploration of bacterial diversity in a given environment, and quantification of the relative abundance of taxa at various levels. However, some parts of the conserved region of the bacterial 16S rRNA gene are similar to the conserved regions of plant chloroplasts and eukaryotic mitochondria. Therefore, if DNA contains a large amount of nontarget DNA, this nontarget DNA can be coamplified and consequently produce useless sequence reads. We experimentally assessed the primer pair 335f/769r and the widely used bacterial primer pair SD (S-D-Bact-0341-b-S-17/S-D-Bact-0785-a-A-21). The primer pair 335f/769r was examined for its ability to amplify bacterial DNA in plant and animal feed samples by using the single-strand confirmation polymorphism method. In our present study, these primer pairs were validated for microbial community structure analysis with complex food matrices by using next-generation sequencing. The sequencing results revealed that the primer pair 335f/769r successfully resulted in fewer chloroplast and mitochondrial sequence reads than generated by the universal primer pair SD and therefore is comparatively suitable for metagenomic analyses of complex food matrices, particularly those that are rich in plant DNA. Additionally, some taxonomic groups were missed entirely when only the SD primer pair was used.}, }
@article {pmid29656105, year = {2018}, author = {Dias, C and Lima, KA and Araripe, J and Aleixo, A and Vallinoto, M and Sampaio, I and Schneider, H and Rêgo, PSD}, title = {Mitochondrial introgression obscures phylogenetic relationships among manakins of the genus Lepidothrix (Aves: Pipridae).}, journal = {Molecular phylogenetics and evolution}, volume = {126}, number = {}, pages = {314-320}, doi = {10.1016/j.ympev.2018.04.017}, pmid = {29656105}, issn = {1095-9513}, mesh = {Animals ; DNA, Mitochondrial/genetics ; Haplotypes/genetics ; Mitochondria/*genetics ; Passeriformes/*classification/*genetics ; *Phylogeny ; }, abstract = {Lepidothrix is the most diverse genus of the family Pipridae, with eight recognized species. Although the genus' monophyly has been supported by both molecular and morphological characters, phylogenetic relationships and species limits within Lepidothrix remain uncertain. In the present study, we combined molecular sequences of mitochondrial (ND2 and COI) and nuclear (MYO, G3PDh and I5BF) markers in a multilocus analysis, to evaluate relationships and inter-specific limits among L. iris, L. nattereri, and L. vilasboasi, which are known to hybridize in eastern Amazonia. The results revealed a complex pattern, whereby events of secondary contact and gene flow after isolation and genetic and phenotypic differentiation prevented the recuperation of reciprocal monophyly among the studied taxa. The mitochondrial data indicate that L. nattereri is divided into two non-sister groups, one monophyletic, and the other, paraphyletic, with L. iris iris being more closely related to one of the two L. nattereri groups, while L. iris eucephala forms an undifferentiated clade with L. vilasboasi, probably resulting from an extensive process of mitochondrial introgression. In agreement with a previous study based on Single Nucleotide Polymorphism (SNP) data, mitochondrial haplotype networks also support that L. vilasboasi does not represent a recent &quot;hybrid swarm&quot; between L. iris and L. nattereri, but instead a genetically divergent lineage with a separate species status. Finally, the sister relationship recovered herein between L. iris iris and some western populations of L. nattereri currently in allopatry is also apparently explained by mitochondrial introgression, as also supported for nuclear genes by SNP data, indicating a complex scenario of past contact and gene flow between currently geographically distant Lepidothrix lineages.}, }
@article {pmid29654216, year = {2018}, author = {Reichold, M and Klootwijk, ED and Reinders, J and Otto, EA and Milani, M and Broeker, C and Laing, C and Wiesner, J and Devi, S and Zhou, W and Schmitt, R and Tegtmeier, I and Sterner, C and Doellerer, H and Renner, K and Oefner, PJ and Dettmer, K and Simbuerger, JM and Witzgall, R and Stanescu, HC and Dumitriu, S and Iancu, D and Patel, V and Mozere, M and Tekman, M and Jaureguiberry, G and Issler, N and Kesselheim, A and Walsh, SB and Gale, DP and Howie, AJ and Martins, JR and Hall, AM and Kasgharian, M and O'Brien, K and Ferreira, CR and Atwal, PS and Jain, M and Hammers, A and Charles-Edwards, G and Choe, CU and Isbrandt, D and Cebrian-Serrano, A and Davies, B and Sandford, RN and Pugh, C and Konecki, DS and Povey, S and Bockenhauer, D and Lichter-Konecki, U and Gahl, WA and Unwin, RJ and Warth, R and Kleta, R}, title = {Glycine Amidinotransferase (GATM), Renal Fanconi Syndrome, and Kidney Failure.}, journal = {Journal of the American Society of Nephrology : JASN}, volume = {29}, number = {7}, pages = {1849-1858}, pmid = {29654216}, issn = {1533-3450}, support = {//Wellcome Trust/United Kingdom ; }, abstract = {Background For many patients with kidney failure, the cause and underlying defect remain unknown. Here, we describe a novel mechanism of a genetic order characterized by renal Fanconi syndrome and kidney failure.Methods We clinically and genetically characterized members of five families with autosomal dominant renal Fanconi syndrome and kidney failure. We performed genome-wide linkage analysis, sequencing, and expression studies in kidney biopsy specimens and renal cells along with knockout mouse studies and evaluations of mitochondrial morphology and function. Structural studies examined the effects of recognized mutations.Results The renal disease in these patients resulted from monoallelic mutations in the gene encoding glycine amidinotransferase (GATM), a renal proximal tubular enzyme in the creatine biosynthetic pathway that is otherwise associated with a recessive disorder of creatine deficiency. In silico analysis showed that the particular GATM mutations, identified in 28 members of the five families, create an additional interaction interface within the GATM protein and likely cause the linear aggregation of GATM observed in patient biopsy specimens and cultured proximal tubule cells. GATM aggregates-containing mitochondria were elongated and associated with increased ROS production, activation of the NLRP3 inflammasome, enhanced expression of the profibrotic cytokine IL-18, and increased cell death.Conclusions In this novel genetic disorder, fully penetrant heterozygous missense mutations in GATM trigger intramitochondrial fibrillary deposition of GATM and lead to elongated and abnormal mitochondria. We speculate that this renal proximal tubular mitochondrial pathology initiates a response from the inflammasome, with subsequent development of kidney fibrosis.}, }
@article {pmid29653091, year = {2018}, author = {Islam, W and Lin, W and Qasim, M and Islam, SU and Ali, H and Adnan, M and Arif, M and Du, Z and Wu, Z}, title = {A nation-wide genetic survey revealed a complex population structure of Bemisia tabaci in Pakistan.}, journal = {Acta tropica}, volume = {183}, number = {}, pages = {119-125}, doi = {10.1016/j.actatropica.2018.04.015}, pmid = {29653091}, issn = {1873-6254}, mesh = {Agriculture ; Animals ; Base Sequence ; Electron Transport Complex IV/genetics ; Genetic Speciation ; Genetic Variation ; Hemiptera/*genetics ; Insect Proteins/genetics ; Mitochondria/genetics ; *Molecular Epidemiology ; Pakistan ; *Phylogeny ; }, abstract = {The whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) is a cryptic species complex distributed worldwide. In Pakistan, B. tabaci poses a serious threat to agriculture production. To understand its diversity in Pakistan, a large-scale sampling was conducted from various locations of all four provinces of the country and Mitochondrial cytochrome oxidase I (mtCOI) gene sequencing was used to determine the whiteflies genetically. The study revealed the presence of five different cryptic species in Pakistan namely Asia II-1, Asia II-5, Asia II-7, Asia II-8 and MEAM-1, respectively. Among them, Asia II-1, which was previously reported from a few areas in the country, had been found now to be prevalent all over the country covering 88.7% of all the sequenced samples. Based on the mtCOI sequences and genetic distance analyses, the diversity of Asia II-1 was much greater than all other cryptic species, which exist only in small patches.}, }
@article {pmid29643269, year = {2018}, author = {Mori, S and Matsunami, M}, title = {Signature of positive selection in mitochondrial DNA in Cetartiodactyla.}, journal = {Genes &amp; genetic systems}, volume = {93}, number = {2}, pages = {65-73}, doi = {10.1266/ggs.17-00015}, pmid = {29643269}, issn = {1880-5779}, mesh = {Amino Acid Substitution ; Animals ; Artiodactyla/*genetics ; Biological Evolution ; Cetacea/*genetics ; DNA, Mitochondrial/*genetics ; Databases, Genetic ; Evolution, Molecular ; Genomics ; Mammals/genetics ; Mitochondria/genetics ; Phylogeny ; Selection, Genetic/genetics ; }, abstract = {Acceleration of the amino acid substitution rate is a good indicator of positive selection in adaptive evolutionary changes of functional genes. Genomic information about mammals has become readily available in recent years, as many researchers have attempted to clarify the adaptive evolution of mammals by examining evolutionary rate change based on multiple loci. The order Cetartiodactyla (Artiodactyla and Cetacea) is one of the most diverse orders of mammals. Species in this order are found throughout all continents and seas, except Antarctica, and they exhibit wide variation in morphology and habitat. Here, we focused on the metabolism-related genes of mitochondrial DNA (mtDNA) in species of the order Cetartiodactyla using 191 mtDNA sequences available in databases. Based on comparisons of the dN/dS ratio (ω) in 12 protein-coding genes, ATP8 was shown to have a higher ω value (ω = 0.247) throughout Cetartiodactyla than the other 11 genes (ω < 0.05). In a branch-site analysis of ATP8 sequences, a markedly higher ω value of 0.801 was observed in the ancestral lineage of the clade of Cetacea, which is indicative of adaptive evolution. Through efforts to detect positively selected amino acids, codon positions 52 and 54 of ATP8 were shown to have experienced positive selective pressure during the course of evolution; multiple substitutions have occurred at these sites throughout the cetacean lineage. At position 52, glutamic acid was replaced with asparagine, and, at position 54, lysine was replaced with non-charged amino acids. These sites are conserved in most Artiodactyla. These results imply that the ancestor of cetaceans underwent accelerated amino acid changes in ATP8 and replacements at codons 52 and 54, which adjusted metabolism to adapt to the marine environment.}, }
@article {pmid29636759, year = {2018}, author = {Shibata, S and Arimura, SI and Ishikawa, T and Awai, K}, title = {Alterations of Membrane Lipid Content Correlated With Chloroplast and Mitochondria Development in Euglena gracilis.}, journal = {Frontiers in plant science}, volume = {9}, number = {}, pages = {370}, pmid = {29636759}, issn = {1664-462X}, abstract = {Euglenoids are unique protists that can grow photoautotrophically, photomixotrophically, and heterotrophically. Here we grew Euglena gracilis under these different growth conditions and determined cellular contents of seven membrane lipids and one storage lipid (triacylglycerol), which account for more than 94 mol% of total membrane lipids. We also describe the relationship among chloroplast and mitochondria developments with lipid contents, protein contents, and oxygen evolution/consumption rates. In photoautotrophic growth conditions, E. gracilis cells accumulated chlorophyll, photosynthetic proteins, and glycolipids typical to thylakoid membranes. The same occurred for the cells grown under photomixotrophic conditions with higher respiration rates. In heterotrophic conditions, E. gracilis cells had higher respiration rates compared to cells grown in other conditions with the accumulation of pyruvate: NADP+ oxidoreductase, a mitochondrial protein and phospholipid common in mitochondria. Cells were also observed using a confocal laser scanning microscope and found to show more chlorophyll autofluorescence when grown photoautotrophically and photomixotrophycally, and fluorescence of MitoTracker when grown photomixotrophically and heterotrophically. These results suggest that under illumination, E. gracilis develops functional thylakoid membranes with membrane lipids and proteins for photosynthesis. In the medium with glucose, the cells develop mitochondria with phospholipids and proteins for respiration. Possible application based on lipid analysis for the enhancement of wax ester or alkene synthesis is discussed.}, }
@article {pmid29623424, year = {2018}, author = {Peña-Diaz, P and Lukeš, J}, title = {Fe-S cluster assembly in the supergroup Excavata.}, journal = {Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry}, volume = {23}, number = {4}, pages = {521-541}, pmid = {29623424}, issn = {1432-1327}, abstract = {The majority of established model organisms belong to the supergroup Opisthokonta, which includes yeasts and animals. While enlightening, this focus has neglected protists, organisms that represent the bulk of eukaryotic diversity and are often regarded as primitive eukaryotes. One of these is the &quot;supergroup&quot; Excavata, which comprises unicellular flagellates of diverse lifestyles and contains species of medical importance, such as Trichomonas, Giardia, Naegleria, Trypanosoma and Leishmania. Excavata exhibits a continuum in mitochondrial forms, ranging from classical aerobic, cristae-bearing mitochondria to mitochondria-related organelles, such as hydrogenosomes and mitosomes, to the extreme case of a complete absence of the organelle. All forms of mitochondria house a machinery for the assembly of Fe-S clusters, ancient cofactors required in various biochemical activities needed to sustain every extant cell. In this review, we survey what is known about the Fe-S cluster assembly in the supergroup Excavata. We aim to bring attention to the diversity found in this group, reflected in gene losses and gains that have shaped the Fe-S cluster biogenesis pathways.}, }
@article {pmid29621569, year = {2018}, author = {Seligmann, H}, title = {Alignment-based and alignment-free methods converge with experimental data on amino acids coded by stop codons at split between nuclear and mitochondrial genetic codes.}, journal = {Bio Systems}, volume = {167}, number = {}, pages = {33-46}, doi = {10.1016/j.biosystems.2018.03.002}, pmid = {29621569}, issn = {1872-8324}, mesh = {Amino Acid Sequence ; Amino Acids/*genetics ; Animals ; Anticodon/genetics ; Cell Nucleus/*genetics ; Codon, Terminator/*genetics ; Data Interpretation, Statistical ; Evolution, Molecular ; Genetic Code/*genetics ; Humans ; Mitochondria/*genetics ; }, abstract = {Genetic codes mainly evolve by reassigning punctuation codons, starts and stops. Previous analyses assuming that undefined amino acids translate stops showed greater divergence between nuclear and mitochondrial genetic codes. Here, three independent methods converge on which amino acids translated stops at split between nuclear and mitochondrial genetic codes: (a) alignment-free genetic code comparisons inserting different amino acids at stops; (b) alignment-based blast analyses of hypothetical peptides translated from non-coding mitochondrial sequences, inserting different amino acids at stops; (c) biases in amino acid insertions at stops in proteomic data. Hence short-term protein evolution models reconstruct long-term genetic code evolution. Mitochondria reassign stops to amino acids otherwise inserted at stops by codon-anticodon mismatches (near-cognate tRNAs). Hence dual function (translation termination and translation by codon-anticodon mismatch) precedes mitochondrial reassignments of stops to amino acids. Stop ambiguity increases coded information, compensates endocellular mitogenome reduction. Mitochondrial codon reassignments might prevent viral infections.}, }
@article {pmid29618317, year = {2018}, author = {Doyle, JM and Bell, DA and Bloom, PH and Emmons, G and Fesnock, A and Katzner, TE and LaPré, L and Leonard, K and SanMiguel, P and Westerman, R and Andrew DeWoody, J}, title = {New insights into the phylogenetics and population structure of the prairie falcon (Falco mexicanus).}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {233}, pmid = {29618317}, issn = {1471-2164}, support = {L12AC20102, L11PX02237, L12AC2010//U.S. Bureau of Land Management/ ; University Faculty Scholar program//Provost's Office at Purdue University/ ; PINN645-21//National Park Service/ ; BIO170038//XSEDE/ ; }, mesh = {Animals ; Avian Proteins/*genetics ; California ; Falconiformes/*classification/genetics ; Female ; Genetics, Population ; Idaho ; Mitochondria/genetics ; Phylogeny ; Phylogeography ; *Polymorphism, Single Nucleotide ; Whole Genome Sequencing/*veterinary ; }, abstract = {BACKGROUND: Management requires a robust understanding of between- and within-species genetic variability, however such data are still lacking in many species. For example, although multiple population genetics studies of the peregrine falcon (Falco peregrinus) have been conducted, no similar studies have been done of the closely-related prairie falcon (F. mexicanus) and it is unclear how much genetic variation and population structure exists across the species' range. Furthermore, the phylogenetic relationship of F. mexicanus relative to other falcon species is contested. We utilized a genomics approach (i.e., genome sequencing and assembly followed by single nucleotide polymorphism genotyping) to rapidly address these gaps in knowledge.<br><br>RESULTS: We sequenced the genome of a single female prairie falcon and generated a 1.17 Gb (gigabases) draft genome assembly. We generated maximum likelihood phylogenetic trees using complete mitochondrial genomes as well as nuclear protein-coding genes. This process provided evidence that F. mexicanus is an outgroup to the clade that includes the peregrine falcon and members of the subgenus Hierofalco. We annotated > 16,000 genes and almost 600,000 high-quality single nucleotide polymorphisms (SNPs) in the nuclear genome, providing the raw material for a SNP assay design featuring > 140 gene-associated markers and a molecular-sexing marker. We subsequently genotyped ~ 100 individuals from California (including the San Francisco East Bay Area, Pinnacles National Park and the Mojave Desert) and Idaho (Snake River Birds of Prey National Conservation Area). We tested for population structure and found evidence that individuals sampled in California and Idaho represent a single panmictic population.<br><br>CONCLUSIONS: Our study illustrates how genomic resources can rapidly shed light on genetic variability in understudied species and resolve phylogenetic relationships. Furthermore, we found evidence of a single, randomly mating population of prairie falcons across our sampling locations. Prairie falcons are highly mobile and relatively rare long-distance dispersal events may promote gene flow throughout the range. As such, California's prairie falcons might be managed as a single population, indicating that management actions undertaken to benefit the species at the local level have the potential to influence the species as a whole.}, }
@article {pmid29618295, year = {2018}, author = {Derbikova, KS and Levitsky, SA and Chicherin, IV and Vinogradova, EN and Kamenski, PA}, title = {Activation of Yeast Mitochondrial Translation: Who Is in Charge?.}, journal = {Biochemistry. Biokhimiia}, volume = {83}, number = {2}, pages = {87-97}, doi = {10.1134/S0006297918020013}, pmid = {29618295}, issn = {1608-3040}, mesh = {Cytochromes b/genetics/metabolism ; Electron Transport Complex IV/genetics/metabolism ; Mitochondria/genetics/*metabolism ; Mitochondrial Proteins/genetics/metabolism ; RNA, Messenger/metabolism ; Saccharomyces cerevisiae/*metabolism ; Saccharomyces cerevisiae Proteins/genetics/metabolism ; Transcriptional Activation ; }, abstract = {Mitochondrial genome has undergone significant reduction in a course of evolution; however, it still contains a set of protein-encoding genes and requires translational machinery for their expression. Mitochondrial translation is of the prokaryotic type with several remarkable differences. This review is dedicated to one of the most puzzling features of mitochondrial protein synthesis, namely, the system of translational activators, i.e., proteins that specifically regulate translation of individual mitochondrial mRNAs and couple protein biosynthesis with the assembly of mitochondrial respiratory chain complexes. The review does not claim to be a comprehensive analysis of all published data; it is rather focused on the idea of the &quot;core component&quot; of the translational activator system.}, }
@article {pmid29616678, year = {2018}, author = {Nie, WH and Wang, JH and Su, WT and Hu, Y and He, SW and Jiang, XL and He, K}, title = {Species identification of crested gibbons (Nomascus) in captivity in China using karyotyping- and PCR-based approaches.}, journal = {Zoological research}, volume = {39}, number = {5}, pages = {356-363}, pmid = {29616678}, issn = {2095-8137}, mesh = {Animals ; Animals, Zoo ; Cell Nucleus/genetics ; China ; Endangered Species ; Genes/genetics ; Hylobates/classification/*genetics ; In Situ Hybridization, Fluorescence ; Karyotype ; Karyotyping ; Mitochondria/genetics ; Polymerase Chain Reaction ; }, abstract = {Gibbons and siamangs (Hylobatidae) are well-known for their rapid chromosomal evolution, which has resulted in high speciation rate within the family. On the other hand, distinct karyotypes do not prevent speciation, allowing interbreeding between individuals in captivity, and the unwanted hybrids are ethically problematic as all gibbon species are endangered or critically endangered. Thus, accurate species identification is crucial for captive breeding, particularly in China where studbooks are unavailable. Identification based on external morphology is difficult, especially for hybrids, because species are usually similar in appearance. In this study, we employed G-banding karyotyping and fluorescence in situ hybridization (FISH) as well as a PCR-based approach to examine karyotypic characteristics and identify crested gibbons of the genus Nomascus from zoos and nature reserves in China. We characterized and identified five karyotypes from 21 individuals of Nomascus. Using karyotypes and mitochondrial and nuclear genes, we identified three purebred species and three hybrids, including one F2 hybrid between N. gabriellae and N. siki. Our results also supported that N. leucogenys and N. siki shared the same inversion on chromosome 7, which resolves arguments from previous studies. Our results demonstrated that both karyotyping and DNA-based approaches were suitable for identifying purebred species, though neither was ideal for hybrid identification. The advantages and disadvantages of both approaches are discussed. Our results further highlight the importance of animal ethics and welfare, which are critical for endangered species in captivity.}, }
@article {pmid29614345, year = {2018}, author = {Fan, Z and Zhou, A and Osada, N and Yu, J and Jiang, J and Li, P and Du, L and Niu, L and Deng, J and Xu, H and Xing, J and Yue, B and Li, J}, title = {Ancient hybridization and admixture in macaques (genus Macaca) inferred from whole genome sequences.}, journal = {Molecular phylogenetics and evolution}, volume = {127}, number = {}, pages = {376-386}, doi = {10.1016/j.ympev.2018.03.038}, pmid = {29614345}, issn = {1095-9513}, support = {R00 HG005846/HG/NHGRI NIH HHS/United States ; }, mesh = {Animals ; Base Sequence ; *Gene Flow ; Genetic Variation ; *Genome ; Heterozygote ; *Hybridization, Genetic ; Macaca mulatta/*genetics ; Phylogeny ; Polymorphism, Single Nucleotide/genetics ; Principal Component Analysis ; *Whole Genome Sequencing ; }, abstract = {The evolutionary history of the stump-tailed macaque (Macaca arctoides) and its genetic relationship to other macaques is a subject of continuing controversy. Here, we have reported the first genome sequences of two stump-tailed macaques and one Assamese macaque (M. assamensis). Additionally, we have investigated the genetic diversity between macaque species and analyzed ancient hybridization events. Genome-wide analyses demonstrated that the stump-tailed macaque is more closely related to sinica species than to fascicularis/mulatta species. This topology contradicts the mitochondrial sequence-based phylogeny that places the stump-tailed macaque into the fascicularis/mulatta group. However, our results further show that stump-tailed macaques have genetic backgrounds distinct from sinica species, and present evidence of gene flows with rhesus macaques. We suggest that an ancient introgression occurred after stump-tailed macaques diverged from sinica species. The distinct gene flow between proto-arctoides and proto-mulatta resulted in the transfer of rhesus macaque-type mitochondria into proto-arctoides. The rhesus macaque-type mitochondria remained in populations because of genetic drift during the bottleneck. The PSMC results and morphological and geographic evidence are consistent with the mitochondria capture pattern in the stump-tailed macaque. The molecular clock estimates suggest that the mitochondrial transference into stump-tailed macaques occurred 0.4-1.4 million years ago. Furthermore, we detected extensive admixtures between different macaque species, indicating that gene flow has played an important role in the evolutionary history of the genus Macaca.}, }
@article {pmid29609620, year = {2018}, author = {Hornok, S and Beck, R and Farkas, R and Grima, A and Otranto, D and Kontschán, J and Takács, N and Horváth, G and Szőke, K and Szekeres, S and Majoros, G and Juhász, A and Salant, H and Hofmann-Lehmann, R and Stanko, M and Baneth, G}, title = {High mitochondrial sequence divergence in synanthropic flea species (Insecta: Siphonaptera) from Europe and the Mediterranean.}, journal = {Parasites &amp; vectors}, volume = {11}, number = {1}, pages = {221}, pmid = {29609620}, issn = {1756-3305}, support = {115854//OTKA/International ; }, mesh = {Animals ; *Base Sequence ; Ctenocephalides/classification/genetics ; Europe ; Flea Infestations/parasitology ; *Genetic Variation ; Haplotypes ; Humans ; Insect Vectors/classification/genetics ; Mediterranean Region ; Mitochondria/*genetics ; Phylogeny ; Siphonaptera/*classification/*genetics ; }, abstract = {BACKGROUND: Adult fleas are haematophagous ectoparasites of warm-blooded vertebrates, particularly mammals. Among them, the cat flea (Ctenocephalides felis) and the human flea (Pulex irritans) have high veterinary-medical significance, owing to their cosmopolitan distribution and role in the transmission of important vector-borne pathogens. While the taxonomy of Ct. felis has been investigated on a morphological basis during the past decades, its molecular-phylogenetic analyses have been only recently conducted. This study expands the knowledge on Ct. felis from hitherto less studied geographical regions, and includes representatives from additional flea families, less investigated with molecular approaches.<br><br>METHODS: Fleas were collected in four countries of the Mediterranean Basin (Croatia, Italy, Malta and Israel), as well as in Hungary, from domestic and wild carnivores, rodents and humans. The DNA extracts of representative fleas (n = 148), belonging to ten species of eight genera, were used for PCR amplification of part of their cytochrome c oxidase subunits 1, 2 (cox1, cox2) and 18S rRNA genes, followed by sequencing and phylogenetic analyses.<br><br>RESULTS: The majority (65.6%) of Ct. felis felis cox2 sequences showed 99.4-100% similarity to each other (haplogroup A), whereas those from Malta and Israel had 98.1-98.7% sequence similarity (haplogroup B), and a third sequence from Israel (haplotype C) had as low as 96.3% sequence similarity in comparison with a reference sequence from group &quot;A&quot;. Except for the shape of the head, no consistent morphological differences (e.g. in chaetotaxy) were found between haplogroups &quot;A&quot; and &quot;C&quot;. Haplotypes of Ct. canis were genetically more homogenous, with 99.6-100% sequence similarity to each other. However, when P. irritans collected from humans was compared to those from three species of wild carnivores, these only had 96.6% cox2 similarity. The mouse flea, Leptopsylla segnis and the northern rat flea, Nosopsyllus fasciatus were both shown to have haplotypes with low intraspecific cox2 similarities (96.2 and 94.4%, respectively). Taken together, differences between mitochondrial lineages within four flea species exceeded that observed between two Chaetopsylla spp. (which had 97.3% cox2 similarity). The topologies of cox1 and cox2 phylogenetic trees were in line with relevant sequence comparisons. Conversely, 18S rRNA gene analyses only resolved differences above the species level.<br><br>CONCLUSIONS: Ctenocephalides felis felis, P. irritans, L. segnis and N. fasciatus were shown to have such a high level of mitochondrial gene heterogeneity, that the uniformity of these flea taxa should be reconsidered. Although the present results are limited (especially in the case of L. segnis and N. fasciatus), there appears to be no geographical or host restriction, which could explain the divergence of these genetic lineages.}, }
@article {pmid29587633, year = {2018}, author = {Chase, EE and Robicheau, BM and Veinot, S and Breton, S and Stewart, DT}, title = {The complete mitochondrial genome of the hermaphroditic freshwater mussel Anodonta cygnea (Bivalvia: Unionidae): in silico analyses of sex-specific ORFs across order Unionoida.}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {221}, pmid = {29587633}, issn = {1471-2164}, support = {217175//Natural Sciences and Engineering Research Council of Canada/International ; }, mesh = {Animals ; Computer Simulation ; DNA, Mitochondrial/genetics ; Disorders of Sex Development/*genetics ; Female ; Fresh Water ; *Genome, Mitochondrial ; Male ; Mitochondrial Proteins/genetics ; *Open Reading Frames ; Phylogeny ; Sex Factors ; Unionidae/classification/*genetics ; }, abstract = {BACKGROUND: Doubly uniparental inheritance (DUI) of mitochondrial DNA in bivalves is a fascinating exception to strictly maternal inheritance as practiced by all other animals. Recent work on DUI suggests that there may be unique regions of the mitochondrial genomes that play a role in sex determination and/or sexual development in freshwater mussels (order Unionoida). In this study, one complete mitochondrial genome of the hermaphroditic swan mussel, Anodonta cygnea, is sequenced and compared to the complete mitochondrial genome of the gonochoric duck mussel, Anodonta anatina. An in silico assessment of novel proteins found within freshwater bivalve species (known as F-, H-, and M-open reading frames or ORFs) is conducted, with special attention to putative transmembrane domains (TMs), signal peptides (SPs), signal cleavage sites (SCS), subcellular localization, and potential control regions. Characteristics of TMs are also examined across freshwater mussel lineages.<br><br>RESULTS: In silico analyses suggests the presence of SPs and SCSs and provides some insight into possible function(s) of these novel ORFs. The assessed confidence in these structures and functions was highly variable, possibly due to the novelty of these proteins. The number and topology of putative TMs appear to be maintained among both F- and H-ORFs, however, this is not the case for M-ORFs. There does not appear to be a typical control region in H-type mitochondrial DNA, especially given the loss of tandem repeats in unassigned regions when compared to F-type mtDNA.<br><br>CONCLUSION: In silico analyses provides a useful tool to discover patterns in DUI and to navigate further in situ analyses related to DUI in freshwater mussels. In situ analysis will be necessary to further explore the intracellular localizations and possible role of these open reading frames in the process of sex determination in freshwater mussel.}, }
@article {pmid29579296, year = {2018}, author = {Caspermeyer, J}, title = {Cockroach Ancient Geographic and Genomic History Traced Back to Last Supercontinent.}, journal = {Molecular biology and evolution}, volume = {35}, number = {4}, pages = {1035}, doi = {10.1093/molbev/msy039}, pmid = {29579296}, issn = {1537-1719}, mesh = {Animals ; *Cockroaches ; Genomics ; Mitochondria ; *Phylogeny ; }, }
@article {pmid29575366, year = {2018}, author = {Ivanov, V and Lee, KM and Mutanen, M}, title = {Mitonuclear discordance in wolf spiders: Genomic evidence for species integrity and introgression.}, journal = {Molecular ecology}, volume = {27}, number = {7}, pages = {1681-1695}, doi = {10.1111/mec.14564}, pmid = {29575366}, issn = {1365-294X}, mesh = {Animals ; Cell Nucleus/*genetics ; Electron Transport Complex IV/genetics ; Genetic Loci ; *Genome, Mitochondrial ; *Genomics ; Likelihood Functions ; Mitochondria/genetics ; Phylogeny ; Species Specificity ; Spiders/*genetics ; }, abstract = {Systematists and taxonomists have benefited greatly from the emergence of molecular methods. Species identification has become straightforward through DNA barcoding and the rapid build-up of massive DNA barcode reference libraries. In animals, mitonuclear discordance can significantly complicate the process of species identification and delimitation. The causes of mitonuclear discordance are either biological (e.g., introgression, incomplete lineage sorting, horizontal gene transfer androgenesis) or induced by operational factors (e.g., human error with specimen misidentification or incorrect species delimitation). Moreover, endosymbionts may play an important role in promoting fixation of mitochondrial genomes. Here, we study the mitonuclear discordance of wolf spiders species (Lycosidae) (independent cases from Alopecosa aculeata and Pardosa pullata groups) that share identical COI DNA barcodes. We approached the case utilizing double-digest restriction site-associated DNA sequencing (ddRADseq) to obtain and analyse genomic-scale data. Our results suggest that the observed cases of mitonuclear discordance are not due to operational reasons but result from biological processes. Further analysis indicated introgression and that incomplete lineage sorting is unlikely to have been responsible for the observed discrepancy. Additional survey of endosymbionts provided ideas on further research and their role in shaping mitochondrial DNA distribution patterns. Thus, ddRADseq grants an efficient way to study the taxonomy of problematic groups with insight into underlying evolutionary processes.}, }
@article {pmid29567505, year = {2018}, author = {O'Connell, KA and Smith, EN}, title = {The effect of missing data on coalescent species delimitation and a taxonomic revision of whipsnakes (Colubridae: Masticophis).}, journal = {Molecular phylogenetics and evolution}, volume = {127}, number = {}, pages = {356-366}, doi = {10.1016/j.ympev.2018.03.018}, pmid = {29567505}, issn = {1095-9513}, mesh = {Animals ; Bayes Theorem ; Biodiversity ; Cell Nucleus/genetics ; Colubridae/*classification ; Cytochromes c/genetics ; Geography ; Mitochondria/genetics ; *Phylogeny ; Species Specificity ; }, abstract = {A stable alpha taxonomy is essential to understanding evolutionary processes and achieving effective conservation aims. Taxonomy depends on the identification of independently evolving lineages, and the delimitation of these lineages based on multiple lines of evidence. Coalescent species delimitation within an integrative framework has increased the rigor of the delimitation process. Here we use genome-wide SNP data and coalescent species delimitation to explore lineage relationships within several North American whipsnake species, test the species status of several lineages, and test the effect of missing data on species delimitation. We find support for the elevation of several previously recognized subspecies to full species status, and formally elevate two species. This study demonstrates the power of molecular data and model-based delimitation methods to identify evolutionary relationships, and finds that missing data have little impact on the outcome of delimitation analyses.}, }
@article {pmid29563878, year = {2018}, author = {Zeth, K and Zachariae, U}, title = {Ten Years of High Resolution Structural Research on the Voltage Dependent Anion Channel (VDAC)-Recent Developments and Future Directions.}, journal = {Frontiers in physiology}, volume = {9}, number = {}, pages = {108}, pmid = {29563878}, issn = {1664-042X}, abstract = {Mitochondria are evolutionarily related to Gram-negative bacteria and both comprise two membrane systems with strongly differing protein composition. The major protein in the outer membrane of mitochondria is the voltage-dependent anion channel (VDAC), which mediates signal transmission across the outer membrane but also the exchange of metabolites, most importantly ADP and ATP. More than 30 years after its discovery three identical high-resolution structures were determined in 2008. These structures show a 19-stranded anti-parallel beta-barrel with an N-terminal helix located inside. An odd number of beta-strands is also shared by Tom40, another member of the VDAC superfamily. This indicates that this superfamily is evolutionarily relatively young and that it has emerged in the context of mitochondrial evolution. New structural information obtained during the last decade on Tom40 can be used to cross-validate the structure of VDAC and vice versa. Interpretation of biochemical and biophysical studies on both protein channels now rests on a solid basis of structural data. Over the past 10 years, complementary structural and functional information on proteins of the VDAC superfamily has been collected from in-organello, in-vitro, and in silico studies. Most of these findings have confirmed the validity of the original structures. This short article briefly reviews the most important advances on the structure and function of VDAC superfamily members collected during the last decade and summarizes how they enhanced our understanding of the channel.}, }
@article {pmid29555947, year = {2018}, author = {Islam, T and Ghosh, A}, title = {Genome-wide dissection and expression profiling of unique glyoxalase III genes in soybean reveal the differential pattern of transcriptional regulation.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {4848}, pmid = {29555947}, issn = {2045-2322}, abstract = {Reactive carbonyl species, such as methylglyoxal and glyoxal are very toxic in nature and can inactivate various cellular macromolecules such as DNA, RNA, and protein by forming advanced glycation end products. Conventional glyoxalase pathway with two enzymes- glyoxalase I and glyoxalase II, detoxify MG into D-lactate with the help of reduced glutathione. However, DJ-1/PfpI domain(s) containing DJ-1/ Hsp31 proteins do the same in a single step, and thus termed as &quot;glyoxalase III&quot;. A comprehensive genome-wide analysis of soybean identified eleven putative glyoxalase III proteins with DJ-1/PfpI domain encoded by seven genes. Most of these proteins are predicted to be mitochondria and chloroplast localized. In spite of similar function, a differential evolution pattern was observed between Hsp31 and DJ-1 proteins. Expression of GmDJ-1A, GmDJ-1B, and GmDJ-1D2 transcripts was found to be constitutive in different tissues and developmental stages. Transcript profiling revealed the strong substrate-specific upregulation of GmDJ-1 genes in response to exogenous methylglyoxal exposure. Out of seven genes, GmDJ-1D1 and GmDJ-1D2 showed maximum upregulation against salinity, dehydration, and oxidative stresses. Moreover, GmDJ-1D2 showed functional glyoxalase III enzyme activity by utilizing MG as a substrate. Overall, this study identifies some novel tissue-specific and abiotic stress-responsive GmDJ-1 genes that could be investigated further.}, }
@article {pmid29554738, year = {2018}, author = {Braz-Mota, S and Campos, DF and MacCormack, TJ and Duarte, RM and Val, AL and Almeida-Val, VMF}, title = {Mechanisms of toxic action of copper and copper nanoparticles in two Amazon fish species: Dwarf cichlid (Apistogramma agassizii) and cardinal tetra (Paracheirodon axelrodi).}, journal = {The Science of the total environment}, volume = {630}, number = {}, pages = {1168-1180}, doi = {10.1016/j.scitotenv.2018.02.216}, pmid = {29554738}, issn = {1879-1026}, mesh = {Animals ; Characidae/*physiology ; Cichlids/*physiology ; Copper/*toxicity ; Metal Nanoparticles/*toxicity ; Mitochondria/drug effects ; Stress, Physiological/drug effects ; Toxicity Tests ; Water Pollutants, Chemical/*toxicity ; }, abstract = {Copper oxide nanoparticles (nCuO) are widely used in boat antifouling paints and are released into the environment, potentially inducing toxicity to aquatic organisms. The present study aimed to understand the effects of nCuO and dissolved copper (Cu) on two ornamental Amazon fish species: dwarf cichlid (Apistogramma agassizii) and cardinal tetra (Paracheirodon axelrodi). Fish were exposed to 50% of the LC50 for nCuO (dwarf cichlid 58.31μgL-1 and cardinal tetra 69.6μgL-1) and Cu (dwarf cichlid 20μgL-1 and cardinal tetra 22.9μgL-1) for 24, 48, 72 and 96h. Following exposure, aerobic metabolic rate (ṀO2), gill osmoregulatory physiology and mitochondrial function, oxidative stress markers, and morphological damage were evaluated. Our results revealed species specificity in metabolic stress responses. An increase of ṀO2 was noted in cardinal tetra exposed to Cu, but not nCuO, whereas ṀO2 in dwarf cichlid showed little change with either treatment. In contrast, mitochondria from dwarf cichlid exhibited increased proton leak and a resulting decrease in respiratory control ratios in response to nCuO and Cu exposure. This uncoupling was directly related to an increase in reactive oxygen species (ROS) levels. Our findings reveal different metabolic responses between these two species in response to nCuO and Cu, which are probably caused by the differences between species natural histories, indicating that different mechanisms of toxic action of the contaminants are associated to differential osmoregulatory strategies among species.}, }
@article {pmid29551757, year = {2018}, author = {McLean, BS and Nyamsuren, B and Tchabovsky, A and Cook, JA}, title = {Impacts of late Quaternary environmental change on the long-tailed ground squirrel (Urocitellus undulatus) in Mongolia.}, journal = {Zoological research}, volume = {39}, number = {5}, pages = {364-372}, pmid = {29551757}, issn = {2095-8137}, mesh = {Animals ; Climate Change ; Cytochromes b/genetics ; Electron Transport Complex IV/genetics ; Environment ; Genotyping Techniques ; Mitochondria/genetics ; Mongolia ; Phylogeny ; Phylogeography ; Sciuridae/classification/*genetics ; }, abstract = {Impacts of Quaternary environmental changes on mammal faunas of central Asia remain poorly understood due to a lack of geographically comprehensive phylogeographic sampling for most species. To help address this knowledge gap, we conducted the most extensive molecular analysis to date of the long-tailed ground squirrel (Urocitellus undulatus Pallas 1778) in Mongolia, a country that comprises the southern core of this species' range. Drawing on material from recent collaborative field expeditions, we genotyped 128 individuals at 2 mitochondrial genes (cytochrome b and cytochrome oxidase I; 1 797 bp total). Phylogenetic inference supports the existence of two deeply divergent infraspecific lineages (corresponding to subspecies U. u. undulatus and U. u. eversmanni), a result in agreement with previous molecular investigations but discordant with patterns of range-wide craniometric and external phenotypic variation. In the widespread westerneversmanni lineage, we recovered geographically-associated clades from the: (a) Khangai, (b) Mongolian Altai, and (c) Govi Altai mountain ranges. Phylogeographic structure in U. u. eversmanni is consistent with an isolation-by-distance model; however, genetic distances are significantly lower than among subspecies, and intra-clade relationships are largely unresolved. The latter patterns, as well as the relatively higher nucleotide polymorphism of populations from the Great Lakes Depression of northwestern Mongolia, suggest a history of range shifts into these lowland areas in response to Pleistocene glaciation and environmental change, followed by upslope movements and mitochondrial lineage sorting with Holocene aridification. Our study illuminates possible historical mechanisms responsible for U. undulatus genetic structure and contributes to a framework for ongoing exploration of mammalian response to past and present climate change in central Asia.}, }
@article {pmid29547666, year = {2018}, author = {Oxusoff, L and Préa, P and Perez, Y}, title = {A complete logical approach to resolve the evolution and dynamics of mitochondrial genome in bilaterians.}, journal = {PloS one}, volume = {13}, number = {3}, pages = {e0194334}, pmid = {29547666}, issn = {1932-6203}, mesh = {Algorithms ; *Evolution, Molecular ; *Genome, Mitochondrial ; *Genomics/methods ; Mitochondria/genetics ; Models, Genetic ; Phylogeny ; RNA, Ribosomal/genetics ; RNA, Transfer/genetics ; }, abstract = {Investigating how recombination might modify gene order during the evolution has become a routine part of mitochondrial genome analysis. A new method of genomic maps analysis based on formal logic is described. The purpose of this method is to 1) use mitochondrial gene order of current taxa as datasets 2) calculate rearrangements between all mitochondrial gene orders and 3) reconstruct phylogenetic relationships according to these calculated rearrangements within a tree under the assumption of maximum parsimony. Unlike existing methods mainly based on the probabilistic approach, the main strength of this new approach is that it calculates all the exact tree solutions with completeness and provides logical consequences as highly robust results. Moreover, this method infers all possible hypothetical ancestors and reconstructs character states for all internal nodes of the trees. We started by testing our method using the deuterostomes as a study case. Then, with sponges as an outgroup, we investigated the evolutionary history of mitochondrial genomes of 47 bilaterian phyla and emphasised the peculiar case of chaetognaths. This pilot work showed that the use of formal logic in a hypothetico-deductive background such as phylogeny (where experimental testing of hypotheses is impossible) is very promising to explore mitochondrial gene order in deuterostomes and should be applied to many other bilaterian clades.}, }
@article {pmid29543917, year = {2018}, author = {Visser, JH and Bennett, NC and Jansen van Vuuren, B}, title = {Spatial genetic diversity in the Cape mole-rat, Georychus capensis: Extreme isolation of populations in a subterranean environment.}, journal = {PloS one}, volume = {13}, number = {3}, pages = {e0194165}, pmid = {29543917}, issn = {1932-6203}, mesh = {Animal Distribution ; Animals ; Cytochromes b/genetics ; Ecosystem ; *Genetic Variation ; Genetics, Population ; Mitochondria/genetics ; Mole Rats/*genetics ; Phylogeny ; Phylogeography ; South Africa ; }, abstract = {The subterranean niche harbours animals with extreme adaptations. These adaptations decrease the vagility of taxa and, along with other behavioural adaptations, often result in isolated populations characterized by small effective population sizes, high inbreeding, population bottlenecks, genetic drift and consequently, high spatial genetic structure. Although information is available for some species, estimates of genetic diversity and whether this variation is spatially structured, is lacking for the Cape mole-rat (Georychus capensis). By adopting a range-wide sampling regime and employing two variable mitochondrial markers (cytochrome b and control region), we report on the effects that life-history, population demography and geographic barriers had in shaping genetic variation and population genetic patterns in G. capensis. We also compare our results to information available for the sister taxon of the study species, Bathyergus suillus. Our results show that Georychus capensis exhibits low genetic diversity relative to the concomitantly distributed B. suillus, most likely due to differences in habitat specificity, habitat fragmentation and historical population declines. In addition, the isolated nature of G. capensis populations and low levels of population connectivity has led to small effective population sizes and genetic differentiation, possibly aided by genetic drift. Not surprisingly therefore, G. capensis exhibits pronounced spatial structure across its range in South Africa. Along with geographic distance and demography, other factors shaping the genetic structure of G. capensis include the historical and contemporary impacts of mountains, rivers, sea-level fluctuations and elevation. Given the isolation and differentiation among G. capensis populations, the monotypic genus Georychus may represent a species complex.}, }
@article {pmid29543844, year = {2018}, author = {Bekker, EI and Karabanov, DP and Galimov, YR and Haag, CR and Neretina, TV and Kotov, AA}, title = {Phylogeography of Daphnia magna Straus (Crustacea: Cladocera) in Northern Eurasia: Evidence for a deep longitudinal split between mitochondrial lineages.}, journal = {PloS one}, volume = {13}, number = {3}, pages = {e0194045}, pmid = {29543844}, issn = {1932-6203}, mesh = {Animals ; Cell Lineage/*genetics ; Cladocera/*genetics ; DNA, Mitochondrial/genetics ; Daphnia/*genetics ; Europe ; Far East ; Haplotypes/genetics ; Lakes ; Mitochondria/*genetics ; North America ; Phylogeny ; Phylogeography/methods ; Siberia ; }, abstract = {Species with a large geographic distributions present a challenge for phylogeographic studies due to logistic difficulties of obtaining adequate sampling. For instance, in most species with a Holarctic distribution, the majority of studies has concentrated on the European or North American part of the distribution, with the Eastern Palearctic region being notably understudied. Here, we study the phylogeography of the freshwater cladoceran Daphnia magna Straus, 1820 (Crustacea: Cladocera), based on partial mitochondrial COI sequences and using specimens from populations spread longitudinally from westernmost Europe to easternmost Asia, with many samples from previously strongly understudied regions in Siberia and Eastern Asia. The results confirm the previously suspected deep split between Eastern and Western mitochondrial haplotype super-clades. We find a narrow contact zone between these two super-clades in the eastern part of Western Siberia, with proven co-occurrence in a single lake in the Novosibirsk region. However, at present there is no evidence suggesting that the two mitochondrial super-clades represent cryptic species. Rather, they may be explained by secondary contact after expansion from different refugia. Interestingly, Central Siberia has previously been found to be an important contact zone also in other cladoceran species, and may thus be a crucial area for understanding the Eurasian phylogeography of freshwater invertebrates. Together, our study provides an unprecedented complete, while still not global, picture of the phylogeography of this important model species.}, }
@article {pmid29543809, year = {2018}, author = {Abdollahi, N and Albani, A and Anthony, E and Baud, A and Cardon, M and Clerc, R and Czernecki, D and Conte, R and David, L and Delaune, A and Djerroud, S and Fourgoux, P and Guiglielmoni, N and Laurentie, J and Lehmann, N and Lochard, C and Montagne, R and Myrodia, V and Opuu, V and Parey, E and Polit, L and Privé, S and Quignot, C and Ruiz-Cuevas, M and Sissoko, M and Sompairac, N and Vallerix, A and Verrecchia, V and Delarue, M and Guérois, R and Ponty, Y and Sacquin-Mora, S and Carbone, A and Froidevaux, C and Le Crom, S and Lespinet, O and Weigt, M and Abboud, S and Bernardes, J and Bouvier, G and Dequeker, C and Ferré, A and Fuchs, P and Lelandais, G and Poulain, P and Richard, H and Schweke, H and Laine, E and Lopes, A}, title = {Meet-U: Educating through research immersion.}, journal = {PLoS computational biology}, volume = {14}, number = {3}, pages = {e1005992}, pmid = {29543809}, issn = {1553-7358}, mesh = {Computational Biology/*education/*methods ; Humans ; Research/*education ; Research Design ; Students ; Universities ; }, abstract = {We present a new educational initiative called Meet-U that aims to train students for collaborative work in computational biology and to bridge the gap between education and research. Meet-U mimics the setup of collaborative research projects and takes advantage of the most popular tools for collaborative work and of cloud computing. Students are grouped in teams of 4-5 people and have to realize a project from A to Z that answers a challenging question in biology. Meet-U promotes &quot;coopetition,&quot; as the students collaborate within and across the teams and are also in competition with each other to develop the best final product. Meet-U fosters interactions between different actors of education and research through the organization of a meeting day, open to everyone, where the students present their work to a jury of researchers and jury members give research seminars. This very unique combination of education and research is strongly motivating for the students and provides a formidable opportunity for a scientific community to unite and increase its visibility. We report on our experience with Meet-U in two French universities with master's students in bioinformatics and modeling, with protein-protein docking as the subject of the course. Meet-U is easy to implement and can be straightforwardly transferred to other fields and/or universities. All the information and data are available at www.meet-u.org.}, }
@article {pmid29540429, year = {2018}, author = {Czarnoleski, M and Labecka, AM and Dragosz-Kluska, D and Pis, T and Pawlik, K and Kapustka, F and Kilarski, WM and Kozłowski, J}, title = {Concerted evolution of body mass and cell size: similar patterns among species of birds (Galliformes) and mammals (Rodentia).}, journal = {Biology open}, volume = {7}, number = {4}, pages = {}, pmid = {29540429}, issn = {2046-6390}, abstract = {Cell size plays a role in body size evolution and environmental adaptations. Addressing these roles, we studied body mass and cell size in Galliformes birds and Rodentia mammals, and collected published data on their genome sizes. In birds, we measured erythrocyte nuclei and basal metabolic rates (BMRs). In birds and mammals, larger species consistently evolved larger cells for five cell types (erythrocytes, enterocytes, chondrocytes, skin epithelial cells, and kidney proximal tubule cells) and evolved smaller hepatocytes. We found no evidence that cell size differences originated through genome size changes. We conclude that the organism-wide coordination of cell size changes might be an evolutionarily conservative characteristic, and the convergent evolutionary body size and cell size changes in Galliformes and Rodentia suggest the adaptive significance of cell size. Recent theory predicts that species evolving larger cells waste less energy on tissue maintenance but have reduced capacities to deliver oxygen to mitochondria and metabolize resources. Indeed, birds with larger size of the abovementioned cell types and smaller hepatocytes have evolved lower mass-specific BMRs. We propose that the inconsistent pattern in hepatocytes derives from the efficient delivery system to hepatocytes, combined with their intense involvement in supracellular function and anabolic activity.}, }
@article {pmid29538419, year = {2018}, author = {Bocak, L and Motyka, M and Bocek, M and Bocakova, M}, title = {Incomplete sclerotization and phylogeny: The phylogenetic classification of Plastocerus (Coleoptera: Elateroidea).}, journal = {PloS one}, volume = {13}, number = {3}, pages = {e0194026}, pmid = {29538419}, issn = {1932-6203}, mesh = {Animals ; Coleoptera/*genetics ; DNA, Mitochondrial/genetics ; Evolution, Molecular ; Female ; Luminescence ; Male ; Mitochondria/genetics ; Phylogeny ; }, abstract = {The relationships of the monogeneric family Plastoceridae Crowson, 1972 (Coleoptera: Elateroidea) have remained contentious due to its modified morphology, incorrect information on incomplete metamorphosis of females and the absence of molecular data. We produced the sequences for P. angulosus (Germar, 1844) (the type-species of Plastocerus Schaum, 1852) and performed molecular phylogenetic analyses to estimate its position. The analyses of Elateroidea (186 spp.) and Elateridae (110 spp.) molecular datasets of two mitochondrial and two nuclear gene fragments repeatedly placed Plastocerus Schaum, 1852 in relationships with the elaterid genera Oxynopterus Hope, 1842 and Pectocera Hope, 1842. Alternative topologies were rejected by likelihood tests. Therefore, Plastoceridae Crowson, 1972 are down-ranked to the subfamily Plastocerinae in Elateridae Leach, 1815. We suggest that the morphology-based placement and high rank for some elateroid lineages were inferred from the presence of homoplasies which evolved due to incomplete sclerotization. Distantly related soft-bodied elateroids share freely movable and transverse coxae, a shortened prosternum, and a weakly sclerotized abdomen with free ventrites. Importantly, the apomorphic structures characteristic for their closest relatives, such as the prosternal process, mesoventral cavity, and intercoxal keel in the first abdominal ventrite are regularly absent. Consequently, morphology-based phylogenetic analyses suggest deeply rooted positions for lineages without expressed apomorphic character states. Molecular data represent an independent character system that is not affected by the convergent morphological evolution, and therefore molecular phylogenies can elucidate the relationships of incompletely sclerotized lineages.}, }
@article {pmid29533769, year = {2018}, author = {Marsit, S and Dion-Côté, AM and Barbash, DA}, title = {Did Mitochondria Kill the Frog?.}, journal = {Developmental cell}, volume = {44}, number = {5}, pages = {539-541}, doi = {10.1016/j.devcel.2018.02.020}, pmid = {29533769}, issn = {1878-1551}, mesh = {*Genome ; Genomics ; Hybridization, Genetic ; Mitochondria ; *Reproductive Isolation ; }, abstract = {Genomic divergence can cause reproductive isolation between species. The molecular mechanisms underlying reproductive isolation can thus reveal which genomic features evolve rapidly and become unstable or incompatible in hybrids. In a recent paper in Nature, Gibeaux et al. (2018) report paternal genome instability and metabolic imbalance in hybrids between frog species.}, }
@article {pmid29531011, year = {2018}, author = {Wolters, JF and Charron, G and Gaspary, A and Landry, CR and Fiumera, AC and Fiumera, HL}, title = {Mitochondrial Recombination Reveals Mito-Mito Epistasis in Yeast.}, journal = {Genetics}, volume = {209}, number = {1}, pages = {307-319}, pmid = {29531011}, issn = {1943-2631}, support = {R01 GM101320/GM/NIGMS NIH HHS/United States ; }, mesh = {DNA, Mitochondrial ; *Epistasis, Genetic ; Genotype ; Haplotypes ; Mitochondria/*genetics ; Quantitative Trait Loci ; *Recombination, Genetic ; Stress, Physiological ; Yeasts/*genetics ; }, abstract = {Genetic variation in mitochondrial DNA (mtDNA) provides adaptive potential although the underlying genetic architecture of fitness components within mtDNAs is not known. To dissect functional variation within mtDNAs, we first identified naturally occurring mtDNAs that conferred high or low fitness in Saccharomyces cerevisiae by comparing growth in strains containing identical nuclear genotypes but different mtDNAs. During respiratory growth under temperature and oxidative stress conditions, mitotype effects were largely independent of nuclear genotypes even in the presence of mito-nuclear interactions. Recombinant mtDNAs were generated to determine fitness components within high- and low-fitness mtDNAs. Based on phenotypic distributions of isogenic strains containing recombinant mtDNAs, we found that multiple loci contributed to mitotype fitness differences. These mitochondrial loci interacted in epistatic, nonadditive ways in certain environmental conditions. Mito-mito epistasis (i.e., nonadditive interactions between mitochondrial loci) influenced fitness in progeny from four different crosses, suggesting that mito-mito epistasis is a widespread phenomenon in yeast and other systems with recombining mtDNAs. Furthermore, we found that interruption of coadapted mito-mito interactions produced recombinant mtDNAs with lower fitness. Our results demonstrate that mito-mito epistasis results in functional variation through mitochondrial recombination in fungi, providing modes for adaptive evolution and the generation of mito-mito incompatibilities.}, }
@article {pmid29530548, year = {2018}, author = {Zhang, P and Liu, Y and Wang, M and Dong, M and Liu, Z and Jia, Z and Wang, W and Zhang, A and Wang, L and Song, L}, title = {Chinese mitten crab (Eriocheir sinensis) iron-sulphur cluster assembly protein 2 (EsIscA2) is differentially regulated after immune and oxidative stress challenges.}, journal = {Developmental and comparative immunology}, volume = {84}, number = {}, pages = {343-352}, doi = {10.1016/j.dci.2018.03.007}, pmid = {29530548}, issn = {1879-0089}, mesh = {Aeromonas hydrophila/*immunology ; Animals ; Arthropod Proteins/genetics/*metabolism ; Brachyura/*physiology ; Cells, Cultured ; Cloning, Molecular ; Gene Expression Regulation ; Gram-Negative Bacterial Infections/*immunology ; Hemocytes/*physiology ; Immunity, Innate/genetics ; Invertebrates ; Iron/metabolism ; Iron-Sulfur Proteins/genetics/*metabolism ; Lipopolysaccharides/immunology ; Mitochondria/*physiology ; Oxidative Stress/genetics ; Protein Binding ; Sequence Alignment ; }, abstract = {Iron-sulphur clusters (ISCs), one of the oldest and most versatile cofactors of proteins, are involved in catalysis reactions, electron transport reactions, regulation processes as well as sensing of ambient conditions. Iron-sulphur cluster assembly protein (IscA) is a scaffold protein member of ISC formation system, which plays a significant role in the assembly and maturation process of ISC proteins. In the present study, the cDNA sequence of iron-sulphur cluster assembly protein 2 (designated as EsIscA2) was cloned from Eriocheir sinensis. The open reading frame (ORF) of EsIscA2 was of 507 bp, encoding a peptide of 168 amino acids with a typically conserved Fe-S domain. A tetrameric form was predicated by the SWISS-MODEL prediction algorithm, and three conserved cysteine residues (Cys-93, Cys-158, Cys-160) from each IscA monomer were predicted to form a 'cysteine pocket'. The deduced amino acid sequence of EsIscA2 shared over 50% similarity with that of other IscAs. EsIscA2 was clustered with IscA2 proteins from invertebrates and vertebrates, indicating that the protein was highly conservative in the evolution. rEsIscA2 exhibited a high iron binding affinity in the concentration ranging from 2 to 200 μM. EsIscA2 transcripts were detected in all the tested tissues including gonad, hemocytes, gill, muscle, heart, hepatopancreas and eyestalk, and EsIscA2 protein was detected in the mitochondria of hemocytes. The highest mRNA expression level of EsIscA2 was detected in muscle and hepatopancreas, which was about 34.66-fold (p < 0.05) and 27.07-fold (p < 0.05) of that in hemocytes, respectively. After Aeromonas hydrophila and lipopolysaccharide (LPS) stimulations, the mRNA expression of EsIscA2 in hemocytes was down-regulated and reached the lowest level at 24 h (0.31-fold, p < 0.05) and 48 h (0.29-fold, p < 0.05) compared to control group, respectively. And the expression of EsIscA2 mRNA in hepatopancreas was repressed from 6 h to 48 h post stimulation (p < 0.05). When the primary cultured crab hemocytes were incubated with different concentrations of H2O2 for 15 min, the expression level of EsIscA2 mRNA was significantly repressed to the 0.34-0.44-fold of that in the control group. After A. hydrophila stimulation, the mRNA expression of EsGrx2 was up-regulated at 3 h (3.22-fold compared to control group, p < 0.05) and reached the peak at 12 h (4.88-fold, p < 0.05). All these results suggested that EsIscA2 had iron-binding capabilities as observed in IscA proteins from other organisms, supporting the role of EsIscA2 as a mitochondrial iron donor for ISC synthesis in Chinese mitten crab. Its differential mRNA expression after immune and oxidative stress challenges suggested the adaptations of ISC synthesis rates to these stress conditions.}, }
@article {pmid29529094, year = {2018}, author = {Bourret, TB and Choudhury, RA and Mehl, HK and Blomquist, CL and McRoberts, N and Rizzo, DM}, title = {Multiple origins of downy mildews and mito-nuclear discordance within the paraphyletic genus Phytophthora.}, journal = {PloS one}, volume = {13}, number = {3}, pages = {e0192502}, pmid = {29529094}, issn = {1932-6203}, mesh = {Cell Nucleus/genetics ; Likelihood Functions ; Mitochondria/genetics ; Peronospora/*genetics ; *Phylogeny ; Phytophthora/*genetics ; Plant Diseases/parasitology ; }, abstract = {Phylogenetic relationships between thirteen species of downy mildew and 103 species of Phytophthora (plant-pathogenic oomycetes) were investigated with two nuclear and four mitochondrial loci, using several likelihood-based approaches. Three Phytophthora taxa and all downy mildew taxa were excluded from the previously recognized subgeneric clades of Phytophthora, though all were strongly supported within the paraphyletic genus. Downy mildews appear to be polyphyletic, with graminicolous downy mildews (GDM), brassicolous downy mildews (BDM) and downy mildews with colored conidia (DMCC) forming a clade with the previously unplaced Phytophthora taxon totara; downy mildews with pyriform haustoria (DMPH) were placed in their own clade with affinities to the obligate biotrophic P. cyperi. Results suggest the recognition of four additional clades within Phytophthora, but few relationships between clades could be resolved. Trees containing all twenty extant downy mildew genera were produced by adding partial coverage of seventeen additional downy mildew taxa; these trees supported the monophyly of the BDMs, DMCCs and DMPHs but suggested that the GDMs are paraphyletic in respect to the BDMs or polyphyletic. Incongruence between nuclear-only and mitochondrial-only trees suggests introgression may have occurred between several clades, particularly those containing biotrophs, questioning whether obligate biotrophic parasitism and other traits with polyphyletic distributions arose independently or were horizontally transferred. Phylogenetic approaches may be limited in their ability to resolve some of the complex relationships between the &quot;subgeneric&quot; clades of Phytophthora, which include twenty downy mildew genera and hundreds of species.}, }
@article {pmid29529025, year = {2018}, author = {Tas, D and Stickley, L and Miozzo, F and Koch, R and Loncle, N and Sabado, V and Gnägi, B and Nagoshi, E}, title = {Parallel roles of transcription factors dFOXO and FER2 in the development and maintenance of dopaminergic neurons.}, journal = {PLoS genetics}, volume = {14}, number = {3}, pages = {e1007271}, pmid = {29529025}, issn = {1553-7404}, mesh = {Animals ; Autophagy ; Basic Helix-Loop-Helix Transcription Factors/genetics/*metabolism ; Cell Survival ; Dopaminergic Neurons/*metabolism/*pathology ; Drosophila Proteins/genetics/*metabolism ; Drosophila melanogaster ; Forkhead Transcription Factors/genetics/*metabolism ; Mitochondria/metabolism ; Mutation ; *Neuroprotection ; Parkinson Disease/metabolism/*pathology ; }, abstract = {Forkhead box (FOXO) proteins are evolutionarily conserved, stress-responsive transcription factors (TFs) that can promote or counteract cell death. Mutations in FOXO genes are implicated in numerous pathologies, including age-dependent neurodegenerative disorders, such as Parkinson's disease (PD). However, the complex regulation and downstream mechanisms of FOXOs present a challenge in understanding their roles in the pathogenesis of PD. Here, we investigate the involvement of FOXO in the death of dopaminergic (DA) neurons, the key pathological feature of PD, in Drosophila. We show that dFOXO null mutants exhibit a selective loss of DA neurons in the subgroup crucial for locomotion, the protocerebral anterior medial (PAM) cluster, during development as well as in adulthood. PAM neuron-targeted adult-restricted knockdown demonstrates that dFOXO in adult PAM neurons tissue-autonomously promotes neuronal survival during aging. We further show that dFOXO and the bHLH-TF 48-related-2 (FER2) act in parallel to protect PAM neurons from different forms of cellular stress. Remarkably, however, dFOXO and FER2 share common downstream processes leading to the regulation of autophagy and mitochondrial morphology. Thus, overexpression of one can rescue the loss of function of the other. These results indicate a role of dFOXO in neuroprotection and highlight the notion that multiple genetic and environmental factors interact to increase the risk of DA neuron degeneration and the development of PD.}, }
@article {pmid29524652, year = {2018}, author = {Berriman, JS and Ellingson, RA and Awbrey, JD and Rico, DM and Valdés, ÁA and Wilson, NG and Aguilar, A and Herbert, DG and Hirano, YM and Trowbridge, CD and Krug, PJ}, title = {A biting commentary: Integrating tooth characters with molecular data doubles known species diversity in a lineage of sea slugs that consume &quot;killer algae&quot;.}, journal = {Molecular phylogenetics and evolution}, volume = {126}, number = {}, pages = {356-370}, pmid = {29524652}, issn = {1095-9513}, support = {R25 GM061331/GM/NIGMS NIH HHS/United States ; }, mesh = {Animals ; Bayes Theorem ; Biodiversity ; DNA, Mitochondrial/genetics ; Electron Transport Complex IV/genetics ; Eukaryota/*physiology ; Gastropoda/*physiology ; Genetic Variation ; Haplotypes/genetics ; Mitochondria/genetics ; *Phylogeny ; Species Specificity ; Tooth/*physiology ; }, abstract = {Predicting biotic resistance to highly invasive strains of &quot;killer algae&quot; (Caulerpa spp.) requires understanding the diversity and feeding preferences of native consumers, including sea slugs in family Oxynoidae. Past studies reported low algal host specificity for Oxynoe (6 spp.) and Lobiger (4 spp.), but these taxonomically challenging slugs may represent species complexes of unrecognized specialists that prefer different Caulerpa spp. Here, we assess global diversity of these genera by integrating gene sequences with morphological data from microscopic teeth and internal shells, the only hard parts in these soft-bodied invertebrates. Four delimitation methods applied to datasets comprising mtDNA and/or nuclear alleles yielded up to 16 species hypotheses for samples comprising five nominal taxa, including five highly divergent species in Lobiger and five in Oxynoe. Depending on the analysis, a further four to six species were recovered in the O. antillarum-viridis complex, a clade in which mitochondrial divergence was low and nuclear alleles were shared among lineages. Bayesian species delimitation using only morphological data supported most candidate species, however, and integrative analyses combining morphological and genetic data fully supported all complex members. Collectively, our findings double the recognized biodiversity in Oxynoidae, and illustrate the value of including data from traits that mediate fast-evolving ecological interactions during species delimitation. Preference for Caulerpa spp. and radular tooth characteristics covaried among newly delimited species, highlighting an unappreciated degree of host specialization and coevolution in these taxa that may help predict their role in containing outbreaks of invasive algae.}, }
@article {pmid29523798, year = {2018}, author = {Fu, YB}, title = {Oat evolution revealed in the maternal lineages of 25 Avena species.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {4252}, pmid = {29523798}, issn = {2045-2322}, abstract = {Cultivated hexaploid oat has three different sets of nuclear genomes (A, C, D), but its evolutionary history remains elusive. A multiplexed shotgun sequencing procedure was explored to acquire maternal phylogenetic signals from chloroplast and mitochondria genomes of 25 Avena species. Phylogenetic analyses of the acquired organelle SNP data revealed a new maternal pathway towards hexaploids of oat genome evolution involving three diploid species (A. ventricosa, A. canariensis and A. longiglumis) and two tetraploid species (A. insularis and A. agadiriana). Cultivated hexaploid A. sativa acquired its maternal genome from an AC genome tetraploid close to A. insularis. Both AC genome A. insularis and AB genome A. agadiriana obtained a maternal genome from an ancient A, not C, genome diploid close to A. longiglumis. Divergence dating showed the major divergences of C genome species 19.9-21.2 million years ago (Mya), of the oldest A genome A. canariensis 13-15 Mya, and of the clade with hexaploids 8.5-9.5 Mya. These findings not only advance our knowledge on oat genome evolution, but also have implications for oat germplasm conservation and utilization in breeding.}, }
@article {pmid29521101, year = {2018}, author = {Wyżewski, Z and Gregorczyk, KP and Szczepanowska, J and Szulc-Dąbrowska, L}, title = {Functional role of Hsp60 as a positive regulator of human viral infection progression.}, journal = {Acta virologica}, volume = {62}, number = {1}, pages = {33-40}, doi = {10.4149/av_2018_104}, pmid = {29521101}, issn = {0001-723X}, mesh = {Chaperonin 60/genetics/*metabolism ; HIV Infections/*metabolism ; Hepatitis B/*metabolism ; Humans ; Influenza, Human/*metabolism ; Mitochondrial Proteins/genetics/*metabolism ; }, abstract = {Heat shock proteins (Hsps) are a family of proteins highly conserved in evolution. Members of the Hsp family are mainly responsible for proper protein folding, however they perform many other functions in living organisms. Hsp60 is a molecular chaperone that is present in mitochondria and cytosol of eukaryotic cells, as well as on their surface. It is also found in the extracellular space and in the peripheral blood. Apart from its role in assisting protein folding in cooperation with Hsp10, Hsp60 contributes to regulation of apoptosis, as well as participates in modulation of the immune system activity. Hsp60 may favor oncogenesis by promoting survival or growth of some tumor cell types. Hsp60 is a subject of medical research due to its role in pathogenesis of certain tumors and infectious diseases. In this review we discuss mechanisms by which Hsp60 promotes development and progression of infections caused by three human viruses: hepatitis B virus (HBV), human immunodeficiency virus (HIV) and influenza A virus.}, }
@article {pmid29515095, year = {2018}, author = {Suwannapoom, C and Wu, YJ and Chen, X and Adeola, AC and Chen, J and Wang, WZ}, title = {Complete mitochondrial genome of the Thai Red Junglefowl (Gallus gallus) and phylogenetic analysis.}, journal = {Zoological research}, volume = {39}, number = {2}, pages = {127-129}, pmid = {29515095}, issn = {2095-8137}, mesh = {Animals ; Chickens/*genetics ; DNA, Mitochondrial/genetics ; Genome/genetics ; High-Throughput Nucleotide Sequencing ; Mitochondria/*genetics ; Phylogeny ; Thailand ; }, abstract = {In this study, we sequenced the complete mitochondrial genome (mitogenome) of the Thai Red Junglefowl (RJF; Gallus gallus) using the next-generation sequencing (NGS) platform of the Ion Torrent PGM. Samples were taken from Mae Wang District, Chiang Mai Province, northern Thailand. Our data showed the complete mitogenome to be 16 785 bp in length, composed by 13 protein-coding genes, 22 tRNA genes, two rRNA genes, and one control region. The genome nucleotide composition was 30.3% A, 23.7% T, 32.5% C, and 13.5% G, resulting in a high percentage of A+T (50.4%). Phylogenetic analysis revealed that the mitogenome belonged to haplogroup X, whereas those of all domestic chickens belong to haplogroups A to G. This newly released mitogenome sequence will advance further evolutionary and population genetics study of the RJF and domestic chicken. The availability of the G. gallus mitogenome will also contribute to further conservation genetics research of a unique species, listed as 'data deficient' in Thailand.}, }
@article {pmid29511984, year = {2018}, author = {Zhao, YQ and Mu, DL and Wang, D and Han, YL and Hou, CC and Zhu, JQ}, title = {Analysis of the function of KIF3A and KIF3B in the spermatogenesis in Boleophthalmus pectinirostris.}, journal = {Fish physiology and biochemistry}, volume = {44}, number = {3}, pages = {769-788}, pmid = {29511984}, issn = {1573-5168}, support = {No. 31272642//National Natural Science Foundation of China (CN)/ ; No. 2015C110005//Scientific and Technical Project of Ningbo/ ; No.2016A610081//Ningbo Natural Science Foundation/ ; }, mesh = {Animals ; *Fish Proteins/chemistry/genetics/metabolism ; Gills/metabolism ; Kidney/metabolism ; *Kinesin/chemistry/genetics/metabolism ; Liver/metabolism ; Male ; Microscopy, Electron, Transmission ; Muscles/metabolism ; Myocardium/metabolism ; *Perciformes ; Phylogeny ; RNA, Messenger/metabolism ; Sequence Analysis, DNA ; Spermatogenesis/genetics/*physiology ; Spermatozoa/metabolism/ultrastructure ; Spleen/metabolism ; Testis/metabolism ; }, abstract = {Spermatogenesis represents one of the most complicated morphological transformation procedures. During this process, the assembly and maintenance of the flagella and intracellular transport of membrane-bound organelles required KIF3A and KIF3B. Our main goal was to test KIF3A and KIF3B location during spermatogenesis of Boleophthalmus pectinirostris. We cloned complete cDNA of KIF3A/3B from the testis of B. pectinirostris by PCR and rapid amplification of cDNA ends (RACE). The predicted secondary and tertiary structures of B. pectinirostris KIF3A/3B contained three domains: (a) the head region, (b) the stalk region, and (c) the tail region. Real-time quantitative PCR (qPCR) results revealed that KIF3A and KIF3B mRNA were presented in all the tissues examined, with the highest expression seen in the testis. In situ hybridization (ISH) showed that KIF3A and KIF3B were distributed in the periphery of the nuclear in the spermatocyte and the early spermatid. In the late spermatid and mature sperm, the KIF3A and KIF3B mRNA were gradually gathered to one side where the flagella formed. Immunofluorescence (IF) showed that KIF3A, tubulin, and mitochondria were co-localized in different stages during spermiogenesis in B. pectinirostris. The temporal and spatial expression dynamics of KIF3A/3B indicate that KIF3A and KIF3B might be involved in flagellar assembly and maintenance at the mRNA and protein levels. Moreover, these proteins may transport the mitochondria resulting in flagellum formation in B. pectinirostris.}, }
@article {pmid29509408, year = {2018}, author = {Wisnovsky, S and Sack, T and Pagliarini, DJ and Laposa, RR and Kelley, SO}, title = {DNA Polymerase θ Increases Mutational Rates in Mitochondrial DNA.}, journal = {ACS chemical biology}, volume = {13}, number = {4}, pages = {900-908}, pmid = {29509408}, issn = {1554-8937}, support = {R01 GM115591/GM/NIGMS NIH HHS/United States ; R01 GM116886/GM/NIGMS NIH HHS/United States ; }, mesh = {Animals ; Cell Line, Tumor ; DNA Replication ; DNA, Mitochondrial/*genetics ; DNA-Directed DNA Polymerase/*physiology ; Humans ; *Mutation Rate ; Neoplasms/genetics ; Oxidative Stress ; }, abstract = {Replication and maintenance of mitochondrial DNA (mtDNA) is essential for cellular function, yet few DNA polymerases are known to function in mitochondria. Here, we conclusively demonstrate that DNA polymerase θ (Polθ) localizes to mitochondria and explore whether this protein is overexpressed in patient-derived cells and tumors. Polθ appears to play an important role in facilitating mtDNA replication under conditions of oxidative stress, and this error-prone polymerase was found to introduce mutations into mtDNA. In patient-derived cells bearing a pathogenic mtDNA mutation, Polθ expression levels were increased, indicating that the oxidative conditions in these cells promote higher expression levels for Polθ. Heightened Polθ expression levels were also associated with elevated mtDNA mutation rates in a selected panel of human tumor tissues, suggesting that this protein can influence mutational frequencies in tumors. The results reported indicate that the mitochondrial function of Polθ may have relevance to human disease.}, }
@article {pmid29495437, year = {2018}, author = {Mansilla, N and Racca, S and Gras, DE and Gonzalez, DH and Welchen, E}, title = {The Complexity of Mitochondrial Complex IV: An Update of Cytochrome c Oxidase Biogenesis in Plants.}, journal = {International journal of molecular sciences}, volume = {19}, number = {3}, pages = {}, pmid = {29495437}, issn = {1422-0067}, mesh = {Animals ; Catalytic Domain ; Electron Transport Complex IV/chemistry/genetics/*metabolism ; *Energy Metabolism ; Enzyme Activation ; Gene Expression Regulation, Plant ; Humans ; Mammals/genetics/metabolism ; Mitochondria/genetics/*metabolism ; Mutation ; Plant Development ; Plant Physiological Phenomena ; Plants/genetics/*metabolism ; Protein Subunits ; Yeasts/genetics/metabolism ; }, abstract = {Mitochondrial respiration is an energy producing process that involves the coordinated action of several protein complexes embedded in the inner membrane to finally produce ATP. Complex IV or Cytochrome c Oxidase (COX) is the last electron acceptor of the respiratory chain, involved in the reduction of O₂ to H₂O. COX is a multimeric complex formed by multiple structural subunits encoded in two different genomes, prosthetic groups (heme a and heme a₃), and metallic centers (CuA and CuB). Tens of accessory proteins are required for mitochondrial RNA processing, synthesis and delivery of prosthetic groups and metallic centers, and for the final assembly of subunits to build a functional complex. In this review, we perform a comparative analysis of COX composition and biogenesis factors in yeast, mammals and plants. We also describe possible external and internal factors controlling the expression of structural proteins and assembly factors at the transcriptional and post-translational levels, and the effect of deficiencies in different steps of COX biogenesis to infer the role of COX in different aspects of plant development. We conclude that COX assembly in plants has conserved and specific features, probably due to the incorporation of a different set of subunits during evolution.}, }
@article {pmid29487229, year = {2018}, author = {Weiss, AKH and Loeffler, JR and Liedl, KR and Gstach, H and Jansen-Dürr, P}, title = {The fumarylacetoacetate hydrolase (FAH) superfamily of enzymes: multifunctional enzymes from microbes to mitochondria.}, journal = {Biochemical Society transactions}, volume = {46}, number = {2}, pages = {295-309}, doi = {10.1042/BST20170518}, pmid = {29487229}, issn = {1470-8752}, mesh = {Amino Acid Sequence ; Carboxy-Lyases/metabolism ; Humans ; Hydrolases/chemistry/*metabolism ; *Microbiota ; Mitochondria/*enzymology ; Sequence Homology, Amino Acid ; Tyrosine/metabolism ; }, abstract = {Prokaryotic and eukaryotic fumarylacetoacetate hydrolase (FAH) superfamily members, sharing conserved regions that form the so-called FAH-domain, catalyze a remarkable variety of reactions. These enzymes are essential in the metabolic pathways to degrade aromatic compounds in prokaryotes and eukaryotes. It appears that prokaryotic FAH superfamily members evolved mainly to allow microbes to generate energy and useful metabolites from complex carbon sources. We review recent findings, indicating that both prokaryotic and eukaryotic members of the FAH superfamily also display oxaloacetate decarboxylase (ODx) activity. The identification of human FAH domain-containing protein 1 as mitochondrial ODx regulating mitochondrial function supports the new concept that, during evolution, eukaryotic FAH superfamily members have acquired important regulatory functions beyond catabolism of complex carbon sources. Molecular studies on the evolution and function of FAH superfamily members are expected to provide new mechanistic insights in their physiological roles.}, }
@article {pmid29486692, year = {2017}, author = {Skulachev, MV and Skulachev, VP}, title = {Programmed Aging of Mammals: Proof of Concept and Prospects of Biochemical Approaches for Anti-aging Therapy.}, journal = {Biochemistry. Biokhimiia}, volume = {82}, number = {12}, pages = {1403-1422}, doi = {10.1134/S000629791712001X}, pmid = {29486692}, issn = {1608-3040}, mesh = {Aging/drug effects/*physiology ; Animals ; Antioxidants/pharmacology ; Humans ; Longevity/drug effects ; Mitochondria/metabolism ; Mole Rats ; Plastoquinone/analogs &amp; derivatives/pharmacology ; Reactive Oxygen Species/metabolism ; }, abstract = {(i) In 2015-2017 we compared possible reasons for longevity of two mammalian highly social species, i.e. naked mole rats and humans. We proposed that in both cases longevity is a result of neoteny, prolongation of youth by deceleration of late ontogeny (Skulachev, V. P. (2015) Abst. 11th Conf. on Mitochondrial Physiology (MiP2015), Lucni Bouda, Czech Republic, pp. 64-66; Skulachev, V. P., Holtze, S., Vyssokikh, M. Y., Bakeeva, L. E., Skulachev, M. V., Markov, A. V., Hildebrandt, T. B., and Sadovnichii, V. A. (2017) Physiol. Rev., 97, 699-720). Both naked mole rats and humans strongly decreased the pressure of natural selection, although in two different manners. Naked mole rats preferred an &quot;aristocratic&quot; pathway when reproduction (and, hence, involvement in evolution) is monopolized by the queen and her several husbands. Huge number of subordinates who have no right to take part in reproduction and hence in evolution serves the small queen's family. Humans used an alternative, &quot;democratic&quot; pathway, namely technical progress facilitating adaptation to the changing environmental conditions. This pathway is open to all humankind. (ii) As a result, aging as a mechanism increasing evolvability by means of facilitation of natural selection became unnecessary for naked mole rats and humans due to strong attenuation of this selection. This is apparently why aging became a counterproductive atavism for these two species and was strongly shifted to late ages. This shift is direct evidence of the hypothesis that aging is programmed, being the last step of late ontogeny. (iii) Further deceleration of aging for humans by means of neoteny is unrealistic since the development of neoteny probably takes million years. (iv) However, if biological aging is a program, an alternative and much simpler way to avoid it seems possible. We mean inhibition of an essential step of this program. (v) At present, the most probable scheme of the aging program assumes that it is a mechanism of slow poisoning of an organism by reactive oxygen species produced by mitochondria. If this is the case, a mitochondria-targeted antioxidant might be an inhibitor of the aging program. During the last 12 years, such an antioxidant, namely SkQ1, was synthesized and studied in detail in our group. It consists of plastoquinone and decyltriphenylphosphonium (a penetrating cation responsible for electrophoretic accumulation of SkQ1 in mitochondria). It was shown that long-term treatment with SkQ1 increased the lifespan of plants, fungi, invertebrates, fish, and mammals. Moreover, SkQ1 is effective in the therapy of various age-related diseases. It was also shown that a single SkQ1 injection could save life in certain models of sudden death of animals. (vi) A tentative scheme is proposed considering aging as a process of chronic phenoptosis, which eventually results in initiation of acute phenoptosis and death. This scheme also suggests that under certain conditions chronic phenoptosis can be neutralized by an anti-aging program that is activated by food restriction regarded by an organism as a signal of starvation. As for acute phenoptosis, it is apparently controlled by receptors responsible for measuring key parameters of homeostasis. The first experimental indications have been already obtained indicating that both chronic and acute phenoptosis are suppressed by SkQ1.}, }
@article {pmid29486209, year = {2018}, author = {Kenny, NJ and Noreña, C and Damborenea, C and Grande, C}, title = {Probing recalcitrant problems in polyclad evolution and systematics with novel mitochondrial genome resources.}, journal = {Genomics}, volume = {}, number = {}, pages = {}, doi = {10.1016/j.ygeno.2018.02.009}, pmid = {29486209}, issn = {1089-8646}, abstract = {For their apparent morphological simplicity, the Platyhelminthes or &quot;flatworms&quot; are a diverse clade found in a broad range of habitats. Their body plans have however made them difficult to robustly classify. Molecular evidence is only beginning to uncover the true evolutionary history of this clade. Here we present nine novel mitochondrial genomes from the still undersampled orders Polycladida and Rhabdocoela, assembled from short Illumina reads. In particular we present for the first time in the literature the mitochondrial sequence of a Rhabdocoel, Bothromesostoma personatum (Typhloplanidae, Mesostominae). The novel mitochondrial genomes examined generally contained the 36 genes expected in the Platyhelminthes, with all possessing 12 of the 13 protein-coding genes normally found in metazoan mitochondrial genomes (ATP8 being absent from all Platyhelminth mtDNA sequenced to date), along with two ribosomal RNA genes. The majority presented possess 22 transfer RNA genes, and a single tRNA gene was absent from two of the nine assembled genomes. By comparison of mitochondrial gene order and phylogenetic analysis of the protein coding and ribosomal RNA genes contained within these sequences with those of previously sequenced species we are able to gain a firm molecular phylogeny for the inter-relationships within this clade. Our phylogenetic reconstructions, using both nucleotide and amino acid sequences under several models and both Bayesian and Maximum Likelihood methods, strongly support the monophyly of Polycladida, and the monophyly of Acotylea and Cotylea within that clade. They also allow us to speculate on the early emergence of Macrostomida, the monophyly of a &quot;Turbellarian-like&quot; clade, the placement of Rhabditophora, and that of Platyhelminthes relative to the Lophotrochozoa (=Spiralia). The data presented here therefore represent a significant advance in our understanding of platyhelminth phylogeny, and will form the basis of a range of future research in the still-disputed classifications within this taxon.}, }
@article {pmid29483657, year = {2018}, author = {Curson, ARJ and Williams, BT and Pinchbeck, BJ and Sims, LP and Martínez, AB and Rivera, PPL and Kumaresan, D and Mercadé, E and Spurgin, LG and Carrión, O and Moxon, S and Cattolico, RA and Kuzhiumparambil, U and Guagliardo, P and Clode, PL and Raina, JB and Todd, JD}, title = {DSYB catalyses the key step of dimethylsulfoniopropionate biosynthesis in many phytoplankton.}, journal = {Nature microbiology}, volume = {3}, number = {4}, pages = {430-439}, doi = {10.1038/s41564-018-0119-5}, pmid = {29483657}, issn = {2058-5276}, abstract = {Dimethylsulfoniopropionate (DMSP) is a globally important organosulfur molecule and the major precursor for dimethyl sulfide. These compounds are important info-chemicals, key nutrients for marine microorganisms, and are involved in global sulfur cycling, atmospheric chemistry and cloud formation1-3. DMSP production was thought to be confined to eukaryotes, but heterotrophic bacteria can also produce DMSP through the pathway used by most phytoplankton 4 , and the DsyB enzyme catalysing the key step of this pathway in bacteria was recently identified 5 . However, eukaryotic phytoplankton probably produce most of Earth's DMSP, yet no DMSP biosynthesis genes have been identified in any such organisms. Here we identify functional dsyB homologues, termed DSYB, in many phytoplankton and corals. DSYB is a methylthiohydroxybutryate methyltransferase enzyme localized in the chloroplasts and mitochondria of the haptophyte Prymnesium parvum, and stable isotope tracking experiments support these organelles as sites of DMSP synthesis. DSYB transcription levels increased with DMSP concentrations in different phytoplankton and were indicative of intracellular DMSP. Identification of the eukaryotic DSYB sequences, along with bacterial dsyB, provides the first molecular tools to predict the relative contributions of eukaryotes and prokaryotes to global DMSP production. Furthermore, evolutionary analysis suggests that eukaryotic DSYB originated in bacteria and was passed to eukaryotes early in their evolution.}, }
@article {pmid29476907, year = {2018}, author = {Layton, KKS and Gosliner, TM and Wilson, NG}, title = {Flexible colour patterns obscure identification and mimicry in Indo-Pacific Chromodoris nudibranchs (Gastropoda: Chromodorididae).}, journal = {Molecular phylogenetics and evolution}, volume = {124}, number = {}, pages = {27-36}, doi = {10.1016/j.ympev.2018.02.008}, pmid = {29476907}, issn = {1095-9513}, mesh = {Animals ; Biodiversity ; DNA, Mitochondrial/genetics ; Gastropoda/genetics/*physiology ; Geography ; Likelihood Functions ; Mitochondria/genetics ; Molecular Mimicry/*genetics ; Phylogeny ; Pigmentation/*genetics ; Sequence Analysis, DNA ; Species Specificity ; }, abstract = {Chromodoris is a genus of colourful nudibranchs that feed on sponges and is found across the Indo-Pacific. While this was once the most diverse chromodorid genus, recent work has shown that the genus should be restricted to a monophyletic lineage that contains only 22 species, all of which exhibit black pigmentation and planar spawning behaviour. Earlier phylogenies of this group are poorly resolved and thus additional work is needed to clarify species boundaries within Chromodoris. This study presents a maximum-likelihood phylogeny based on mitochondrial loci (COI, 16S) for 345 Chromodoris specimens, including data from 323 new specimens and 22 from GenBank, from across the Indo-Pacific. Species hypotheses and phylogenetic analysis uncovered 39 taxa in total containing 18 undescribed species, with only five of 39 taxa showing stable colour patterns and distinct morphotypes. This study also presents the first evidence for regional mimicry in this genus, with C. colemani and C. joshi displaying geographically-based variation in colour patterns which appear to match locally abundant congenerics, highlighting the flexibility of these colour patterns in Chromodoris nudibranchs. The current phylogeny contains short branch lengths, polytomies and poor support at interior nodes, which is indicative of a recent radiation. As such, future work will employ a transcriptome-based exon capture approach for resolving the phylogeny of this group. In all, this study included 21 of the 22 described species in the Chromodoris sensu stricto group with broad sampling coverage from across the Indo-Pacific, constituting the most comprehensive sampling of this group to date. This work highlights several cases of undocumented diversity, ultimately expanding our knowledge of species boundaries in this group, while also demonstrating the limitations of colour patterns for species identification in this genus.}, }
@article {pmid29472284, year = {2018}, author = {Raina, JB and Eme, L and Pollock, FJ and Spang, A and Archibald, JM and Williams, TA}, title = {Symbiosis in the microbial world: from ecology to genome evolution.}, journal = {Biology open}, volume = {7}, number = {2}, pages = {}, pmid = {29472284}, issn = {2046-6390}, abstract = {The concept of symbiosis - defined in 1879 by de Bary as 'the living together of unlike organisms' - has a rich and convoluted history in biology. In part, because it questioned the concept of the individual, symbiosis fell largely outside mainstream science and has traditionally received less attention than other research disciplines. This is gradually changing. In nature organisms do not live in isolation but rather interact with, and are impacted by, diverse beings throughout their life histories. Symbiosis is now recognized as a central driver of evolution across the entire tree of life, including, for example, bacterial endosymbionts that provide insects with vital nutrients and the mitochondria that power our own cells. Symbioses between microbes and their multicellular hosts also underpin the ecological success of some of the most productive ecosystems on the planet, including hydrothermal vents and coral reefs. In November 2017, scientists working in fields spanning the life sciences came together at a Company of Biologists' workshop to discuss the origin, maintenance, and long-term implications of symbiosis from the complementary perspectives of cell biology, ecology, evolution and genomics, taking into account both model and non-model organisms. Here, we provide a brief synthesis of the fruitful discussions that transpired.}, }
@article {pmid29466431, year = {2018}, author = {Ravago-Gotanco, R and de la Cruz, TL and Pante, MJ and Borsa, P}, title = {Cryptic genetic diversity in the mottled rabbitfish Siganus fuscescens with mitochondrial introgression at a contact zone in the South China Sea.}, journal = {PloS one}, volume = {13}, number = {2}, pages = {e0193220}, pmid = {29466431}, issn = {1932-6203}, mesh = {Animals ; Fishes/classification/*genetics ; *Genetic Loci ; *Genotype ; *Microsatellite Repeats ; Mitochondria/*genetics ; Oceans and Seas ; *Phylogeny ; }, abstract = {The taxonomy of the mottled rabbitfish Siganus fuscescens species complex has long been challenging. In this study, we analyzed microsatellite genotypes, mitochondrial lineages, and morphometric data from 373 S. fuscescens individuals sampled from the northern Philippines and Hong Kong (South China Sea, Philippine Sea and Sulu Sea basins), to examine putative species boundaries in samples comprising three co-occurring mitochondrial lineages previously reported to characterize S. fuscescens (Clade A and Clade B) or S. canaliculatus (Clade C). We report the existence of two cryptic species within S. fuscescens in the northeast region of the South China Sea and northern Philippine Sea, supported by genetic and morphological differences. Individual-based assignment methods recovered concordant groupings of individuals into two nuclear genotype clusters (Cluster 1, Cluster 2) with (1) limited gene flow, if any, between them (FST = 0.241; P < 0.001); (2) low frequency of later-generation hybrids; (3) significant association with mitochondrial Clade A and Clade B, respectively; and (4) subtle yet significant body shape differences as inferred from geometric morphometric analysis. The divergence between mitochondrial Clade C and the two other clades was not matched by genetic differences at microsatellite marker loci. The occurrence of discordant mitonuclear combinations (20.5% of the total number of individuals) is thought to result from mitochondrial introgression, consistent with a scenario of demographic, and presumably spatial, post-Pleistocene expansion of populations from northern regions into a secondary contact zone in the South China Sea. Mitonuclear discordance due to introgression obscures phylogenetic relationships for recently-diverged lineages, and cautions against the use of mitochondrial markers alone for species identification within the mottled rabbitfish species complex in the South China Sea region.}, }
@article {pmid29464567, year = {2018}, author = {Schlattner, U and Kay, L and Tokarska-Schlattner, M}, title = {Mitochondrial Proteolipid Complexes of Creatine Kinase.}, journal = {Sub-cellular biochemistry}, volume = {87}, number = {}, pages = {365-408}, doi = {10.1007/978-981-10-7757-9_13}, pmid = {29464567}, issn = {0306-0225}, mesh = {Animals ; *Creatine Kinase/chemistry/metabolism ; Cytosol/chemistry/metabolism ; Humans ; *Mitochondria/chemistry/metabolism ; *Mitochondrial Membranes/chemistry/metabolism ; *Mitochondrial Proteins/chemistry/metabolism ; *Phospholipids/chemistry/metabolism ; Reactive Oxygen Species/chemistry/metabolism ; Thermogenesis/physiology ; }, abstract = {Isoforms of creatine kinase (CK) generate and use phosphocreatine, a concentrated and highly diffusible cellular &quot;high energy&quot; intermediate, for the main purpose of energy buffering and transfer in order to maintain cellular energy homeostasis. The mitochondrial CK isoform (mtCK) localizes to the mitochondrial intermembrane and cristae space, where it assembles into peripherally membrane-bound, large cuboidal homooctamers. These are part of proteolipid complexes wherein mtCK directly interacts with cardiolipin and other anionic phospholipids, as well as with the VDAC channel in the outer membrane. This leads to a stabilization and cross-linking of inner and outer mitochondrial membrane, forming so-called contact sites. Also the adenine nucleotide translocator of the inner membrane can be recruited into these proteolipid complexes, probably mediated by cardiolipin. The complexes have functions mainly in energy transfer to the cytosol and stimulation of oxidative phosphorylation, but also in restraining formation of reactive oxygen species and apoptosis. In vitro evidence indicates a putative role of mtCK in mitochondrial phospholipid distribution, and most recently a role in thermogenesis has been proposed. This review summarizes the essential structural and functional data of these mtCK complexes and describes in more detail the more recent advances in phospholipid interaction, thermogenesis, cancer and evolution of mtCK.}, }
@article {pmid29463212, year = {2018}, author = {Wagner, JT and Singh, PP and Romney, AL and Riggs, CL and Minx, P and Woll, SC and Roush, J and Warren, WC and Brunet, A and Podrabsky, JE}, title = {The genome of Austrofundulus limnaeus offers insights into extreme vertebrate stress tolerance and embryonic development.}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {155}, pmid = {29463212}, issn = {1471-2164}, support = {IOS-1354549//National Science Foundation/International ; CEHG Fellowship//Stanford University/International ; }, mesh = {Adaptation, Biological/*genetics ; Animals ; Base Composition ; Biological Evolution ; Chickens ; Embryo, Nonmammalian ; Embryonic Development/*genetics ; Gene Expression Regulation ; *Genome ; Genome Size ; Genomics/methods ; Killifishes/*embryology/genetics/*physiology ; Mitochondria/genetics/metabolism ; Phylogeny ; Repetitive Sequences, Nucleic Acid ; Stress, Physiological/*genetics ; Vertebrates ; Zebrafish ; }, abstract = {BACKGROUND: The annual killifish Austrofundulus limnaeus inhabits ephemeral ponds in northern Venezuela, South America, and is an emerging extremophile model for vertebrate diapause, stress tolerance, and evolution. Embryos of A. limnaeus regularly experience extended periods of desiccation and anoxia as a part of their natural history and have unique metabolic and developmental adaptations. Currently, there are limited genomic resources available for gene expression and evolutionary studies that can take advantage of A. limnaeus as a unique model system.<br><br>RESULTS: We describe the first draft genome sequence of A. limnaeus. The genome was assembled de novo using a merged assembly strategy and was annotated using the NCBI Eukaryotic Annotation Pipeline. We show that the assembled genome has a high degree of completeness in genic regions that is on par with several other teleost genomes. Using RNA-seq and phylogenetic-based approaches, we identify several candidate genes that may be important for embryonic stress tolerance and post-diapause development in A. limnaeus. Several of these genes include heat shock proteins that have unique expression patterns in A. limnaeus embryos and at least one of these may be under positive selection.<br><br>CONCLUSION: The A. limnaeus genome is the first South American annual killifish genome made publicly available. This genome will be a valuable resource for comparative genomics to determine the genetic and evolutionary mechanisms that support the unique biology of annual killifishes. In a broader context, this genome will be a valuable tool for exploring genome-environment interactions and their impacts on vertebrate physiology and evolution.}, }
@article {pmid29460123, year = {2018}, author = {Larsen, PA and Hunnicutt, KE and Larsen, RJ and Yoder, AD and Saunders, AM}, title = {Warning SINEs: Alu elements, evolution of the human brain, and the spectrum of neurological disease.}, journal = {Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology}, volume = {26}, number = {1-2}, pages = {93-111}, pmid = {29460123}, issn = {1573-6849}, support = {S10 OD018164/OD/NIH HHS/United States ; }, mesh = {Alu Elements/*physiology ; *Biological Evolution ; Brain/*physiology ; Genome, Human ; Humans ; Nervous System Diseases/*genetics ; Neurogenesis ; Retroelements ; }, abstract = {Alu elements are a highly successful family of primate-specific retrotransposons that have fundamentally shaped primate evolution, including the evolution of our own species. Alus play critical roles in the formation of neurological networks and the epigenetic regulation of biochemical processes throughout the central nervous system (CNS), and thus are hypothesized to have contributed to the origin of human cognition. Despite the benefits that Alus provide, deleterious Alu activity is associated with a number of neurological and neurodegenerative disorders. In particular, neurological networks are potentially vulnerable to the epigenetic dysregulation of Alu elements operating across the suite of nuclear-encoded mitochondrial genes that are critical for both mitochondrial and CNS function. Here, we highlight the beneficial neurological aspects of Alu elements as well as their potential to cause disease by disrupting key cellular processes across the CNS. We identify at least 37 neurological and neurodegenerative disorders wherein deleterious Alu activity has been implicated as a contributing factor for the manifestation of disease, and for many of these disorders, this activity is operating on genes that are essential for proper mitochondrial function. We conclude that the epigenetic dysregulation of Alu elements can ultimately disrupt mitochondrial homeostasis within the CNS. This mechanism is a plausible source for the incipient neuronal stress that is consistently observed across a spectrum of sporadic neurological and neurodegenerative disorders.}, }
@article {pmid29455315, year = {2018}, author = {Caparroz, R and Rocha, AV and Cabanne, GS and Tubaro, P and Aleixo, A and Lemmon, EM and Lemmon, AR}, title = {Mitogenomes of two neotropical bird species and the multiple independent origin of mitochondrial gene orders in Passeriformes.}, journal = {Molecular biology reports}, volume = {45}, number = {3}, pages = {279-285}, pmid = {29455315}, issn = {1573-4978}, support = {564036/2010-2//Conselho Nacional de Desenvolvimento Científico e Tecnológico/ ; 445025/2014-0//Conselho Nacional de Desenvolvimento Científico e Tecnológico/ ; 457444/2012-6//Conselho Nacional de Desenvolvimento Científico e Tecnológico/ ; 202796/2014-0//Conselho Nacional de Desenvolvimento Científico e Tecnológico/ ; PIP 2012-2014 0862//Consejo Nacional de Investigaciones Científicas y Técnicas/ ; PICT 2014-2154//Agencia Nacional de Promoción Científica y Tecnológica/ ; }, mesh = {Animals ; Base Sequence/genetics ; Gene Order ; Genes, Mitochondrial ; *Genome, Mitochondrial ; High-Throughput Nucleotide Sequencing/methods ; Mitochondria/*genetics ; Passeriformes/*genetics ; Phylogeny ; RNA, Ribosomal/genetics ; RNA, Transfer/genetics ; Sequence Analysis, DNA/methods ; }, abstract = {At least four mitogenome arrangements occur in Passeriformes and differences among them are derived from an initial tandem duplication involving a segment containing the control region (CR), followed by loss or reduction of some parts of this segment. However, it is still unclear how often duplication events have occurred in this bird order. In this study, the mitogenomes from two species of Neotropical passerines (Sicalis olivascens and Lepidocolaptes angustirostris) with different gene arrangements were first determined. We also estimated how often duplication events occurred in Passeriformes and if the two CR copies demonstrate a pattern of concerted evolution in Sylvioidea. One tissue sample for each species was used to obtain the mitogenomes as a byproduct using next generation sequencing. The evolutionary history of mitogenome rearrangements was reconstructed mapping these characters onto a mitogenome Bayesian phylogenetic tree of Passeriformes. Finally, we performed a Bayesian analysis for both CRs from some Sylvioidea species in order to evaluate the evolutionary process involving these two copies. Both mitogenomes described comprise 2 rRNAs, 22 tRNAs, 13 protein-codon genes and the CR. However, S. olivascens has 16,768 bp showing the ancestral avian arrangement, while L. angustirostris has 16,973 bp and the remnant CR2 arrangement. Both species showed the expected gene order compared to their closest relatives. The ancestral state reconstruction suggesting at least six independent duplication events followed by partial deletions or loss of one copy in some lineages. Our results also provide evidence that both CRs in some Sylvioidea species seem to be maintained in an apparently functional state, perhaps by concerted evolution, and that this mechanism may be important for the evolution of the bird mitogenome.}, }
@article {pmid29449618, year = {2018}, author = {Shinde, P and Sarkar, C and Jalan, S}, title = {Codon based co-occurrence network motifs in human mitochondria.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {3060}, pmid = {29449618}, issn = {2045-2322}, abstract = {The nucleotide polymorphism in the human mitochondrial genome (mtDNA) tolled by codon position bias plays an indispensable role in human population dispersion and expansion. Herein, genome-wide nucleotide co-occurrence networks were constructed using data comprised of five different geographical regions and around 3000 samples for each region. We developed a powerful network model to describe complex mitochondrial evolutionary patterns among codon and non-codon positions. We found evidence that the evolution of human mitochondria DNA is dominated by adaptive forces, particularly mutation and selection, which was supported by many previous studies. The diversity observed in the mtDNA was compared with mutations, co-occurring mutations, network motifs considering codon positions as causing agent. This comparison showed that long-range nucleotide co-occurrences have a large effect on genomic diversity. Most notably, codon motifs apparently underpinned the preferences among codon positions for co-evolution which is probably highly biased during the origin of the genetic code. Our analysis also showed that variable nucleotide positions of different human sub-populations implemented the independent mtDNA evolution to its geographical dispensation. Ergo, this study has provided both a network framework and a codon glance to investigate co-occurring genomic variations that are critical in underlying complex mitochondrial evolution.}, }
@article {pmid29447215, year = {2018}, author = {Keleher, MR and Zaidi, R and Shah, S and Oakley, ME and Pavlatos, C and El Idrissi, S and Xing, X and Li, D and Wang, T and Cheverud, JM}, title = {Maternal high-fat diet associated with altered gene expression, DNA methylation, and obesity risk in mouse offspring.}, journal = {PloS one}, volume = {13}, number = {2}, pages = {e0192606}, pmid = {29447215}, issn = {1932-6203}, support = {P30 CA91842/NH/NIH HHS/United States ; UL1TR000448/NH/NIH HHS/United States ; P30 DK020579/NH/NIH HHS/United States ; P30 CA091842/CA/NCI NIH HHS/United States ; UL1 TR000448/TR/NCATS NIH HHS/United States ; UL1 TR002345/TR/NCATS NIH HHS/United States ; }, mesh = {Animals ; *DNA Methylation ; *Diet, High-Fat ; Female ; *Gene Expression ; Mice ; *Mothers ; Obesity/*epidemiology ; Risk Factors ; }, abstract = {We investigated maternal obesity in inbred SM/J mice by assigning females to a high-fat diet or a low-fat diet at weaning, mating them to low-fat-fed males, cross-fostering the offspring to low-fat-fed SM/J nurses at birth, and weaning the offspring onto a high-fat or low-fat diet. A maternal high-fat diet exacerbated obesity in the high-fat-fed daughters, causing them to weigh more, have more fat, and have higher serum levels of leptin as adults, accompanied by dozens of gene expression changes and thousands of DNA methylation changes in their livers and hearts. Maternal diet particularly affected genes involved in RNA processing, immune response, and mitochondria. Between one-quarter and one-third of differentially expressed genes contained a differentially methylated region associated with maternal diet. An offspring high-fat diet reduced overall variation in DNA methylation, increased body weight and organ weights, increased long bone lengths and weights, decreased insulin sensitivity, and changed the expression of 3,908 genes in the liver. Although the offspring were more affected by their own diet, their maternal diet had epigenetic effects lasting through adulthood, and in the daughters these effects were accompanied by phenotypic changes relevant to obesity and diabetes.}, }
@article {pmid29440651, year = {2018}, author = {Petit, D and Teppa, E and Cenci, U and Ball, S and Harduin-Lepers, A}, title = {Reconstruction of the sialylation pathway in the ancestor of eukaryotes.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {2946}, pmid = {29440651}, issn = {2045-2322}, abstract = {The biosynthesis of sialylated molecules of crucial relevance for eukaryotic cell life is achieved by sialyltransferases (ST) of the CAZy family GT29. These enzymes are widespread in the Deuterostoma lineages and more rarely described in Protostoma, Viridiplantae and various protist lineages raising the question of their presence in the Last eukaryotes Common Ancestor (LECA). If so, it is expected that the main enzymes associated with sialic acids metabolism are also present in protists. We conducted phylogenomic and protein sequence analyses to gain insights into the origin and ancient evolution of ST and sialic acid pathway in eukaryotes, Bacteria and Archaea. Our study uncovered the unreported occurrence of bacterial GT29 ST and evidenced the existence of 2 ST groups in the LECA, likely originating from the endosymbiotic event that generated mitochondria. Furthermore, distribution of the major actors of the sialic acid pathway in the different eukaryotic phyla indicated that these were already present in the LECA, which could also access to this essential monosaccharide either endogenously or via a sialin/sialidase uptake mechanism involving vesicles. This pathway was lost in several basal eukaryotic lineages including Archaeplastida despite the presence of two different ST groups likely assigned to other functions.}, }
@article {pmid29438872, year = {2018}, author = {Nibert, ML and Vong, M and Fugate, KK and Debat, HJ}, title = {Evidence for contemporary plant mitoviruses.}, journal = {Virology}, volume = {518}, number = {}, pages = {14-24}, doi = {10.1016/j.virol.2018.02.005}, pmid = {29438872}, issn = {1096-0341}, mesh = {Crops, Agricultural/*virology ; Evolution, Molecular ; Gene Expression Regulation, Viral/physiology ; Phylogeny ; Plant Diseases/*virology ; Plant Viruses/*classification/physiology ; RNA Viruses/*classification ; RNA, Viral/genetics ; Viral Proteins/genetics/metabolism ; }, abstract = {Mitoviruses have small RNA(+) genomes, replicate in mitochondria, and have been shown to infect only fungi to date. For this report, sequences that appear to represent nearly complete plant mitovirus genomes were recovered from publicly available transcriptome data. Twenty of the refined sequences, 2684-2898 nt long and derived from 10 different species of land plants, appear to encompass the complete coding regions of contemporary plant mitoviruses, which furthermore constitute a monophyletic cluster within genus Mitovirus. Complete coding sequences of several of these viruses were recovered from multiple transcriptome (but not genome) studies of the same plant species and also from multiple plant tissues. Crop plants among implicated hosts include beet and hemp. Other new results suggest that such genuine plant mitoviruses were immediate ancestors to endogenized mitovirus elements now widespread in land plant genomes. Whether these mitoviruses are wholly cryptic with regard to plant health remains to be investigated.}, }
@article {pmid29435647, year = {2018}, author = {Karmi, O and Marjault, HB and Pesce, L and Carloni, P and Onuchic, JN and Jennings, PA and Mittler, R and Nechushtai, R}, title = {The unique fold and lability of the [2Fe-2S] clusters of NEET proteins mediate their key functions in health and disease.}, journal = {Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry}, volume = {23}, number = {4}, pages = {599-612}, pmid = {29435647}, issn = {1432-1327}, support = {R01 GM101467/GM/NIGMS NIH HHS/United States ; }, abstract = {NEET proteins comprise a new class of [2Fe-2S] cluster proteins. In human, three genes encode for NEET proteins: cisd1 encodes mitoNEET (mNT), cisd2 encodes the Nutrient-deprivation autophagy factor-1 (NAF-1) and cisd3 encodes MiNT (Miner2). These recently discovered proteins play key roles in many processes related to normal metabolism and disease. Indeed, NEET proteins are involved in iron, Fe-S, and reactive oxygen homeostasis in cells and play an important role in regulating apoptosis and autophagy. mNT and NAF-1 are homodimeric and reside on the outer mitochondrial membrane. NAF-1 also resides in the membranes of the ER associated mitochondrial membranes (MAM) and the ER. MiNT is a monomer with distinct asymmetry in the molecular surfaces surrounding the clusters. Unlike its paralogs mNT and NAF-1, it resides within the mitochondria. NAF-1 and mNT share similar backbone folds to the plant homodimeric NEET protein (At-NEET), while MiNT's backbone fold resembles a bacterial MiNT protein. Despite the variation of amino acid composition among these proteins, all NEET proteins retained their unique CDGSH domain harboring their unique 3Cys:1His [2Fe-2S] cluster coordination through evolution. The coordinating exposed His was shown to convey the lability to the NEET proteins' [2Fe-2S] clusters. In this minireview, we discuss the NEET fold and its structural elements. Special attention is given to the unique lability of the NEETs' [2Fe-2S] cluster and the implication of the latter to the NEET proteins' cellular and systemic function in health and disease.}, }
@article {pmid29433421, year = {2018}, author = {Li, Q and Dong, K and Xu, L and Jia, X and Wu, J and Sun, W and Zhang, X and Fu, S}, title = {The distribution of three candidate cold-resistant SNPs in six minorities in North China.}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {134}, pmid = {29433421}, issn = {1471-2164}, support = {//Wellcome Trust/United Kingdom ; }, mesh = {Adaptation, Physiological/*genetics ; Asian Continental Ancestry Group/genetics ; Carnitine O-Palmitoyltransferase/genetics ; China ; *Cold Temperature ; Ethnic Groups/classification/*genetics ; Fatty Acid Desaturases/genetics ; Gene Frequency ; Genotype ; Humans ; Linkage Disequilibrium ; Phylogeny ; *Polymorphism, Single Nucleotide ; }, abstract = {BACKGROUND: Heilongjiang Province located in northeast China is a multi-ethnic region with people who have lived in cold conditions for several generations. Fatty acids are important to people with cold resistance. CPT1A encodes a protein that imports long-chain fatty acids into the mitochondria for fatty-acid oxidation. FADS is an essential enzyme for the synthesis of long-chain polyunsaturated fatty acids.<br><br>RESULTS: In the present study, we investigated the distributions of three cold resistance-related SNPs (rs80356779 G > A in CPT1A, rs7115739 T > G in FADS3 and rs174570 C > T in FADS2) from six populations that included 1093 individuals who have lived in Heilongjiang Province for at least three generations. The frequencies of rs174570 and rs7115739 were different in our six north minorities compared to the Chinese Dai in Xishuangbanna (CDX) in southern China. All the SNPs in Hezhen were significantly different from other five studied populations. In addition, the genetic distribution of rs174570 in Daur was significantly different from Manchu and Korea, and the frequency of rs7115739 in Ewenki was significantly different from the other populations. The results also showed that the frequencies of the three SNPs in the six minorities were different from those of Greenlandic Inuit and Siberian population.<br><br>CONCLUSIONS: Our results showed the distributions of the three cold resistance-related SNPs from six populations that included 1093 individuals in northern China. Distributions of the allele frequencies for the cold resistance-related SNPs in northern China were statistically different from those in southern China. These data help to establish the DNA genome database for the six populations and fully preserve existing minority genetic information.}, }
@article {pmid29432738, year = {2018}, author = {Qin, Q and Jin, J and He, F and Zheng, Y and Li, T and Zhang, Y and He, J}, title = {Humanin promotes mitochondrial biogenesis in pancreatic MIN6 β-cells.}, journal = {Biochemical and biophysical research communications}, volume = {497}, number = {1}, pages = {292-297}, doi = {10.1016/j.bbrc.2018.02.071}, pmid = {29432738}, issn = {1090-2104}, mesh = {Animals ; Cell Line ; Insulin-Secreting Cells/cytology/*drug effects/*physiology ; Intracellular Signaling Peptides and Proteins/*administration &amp; dosage/*metabolism ; Mice ; Mitochondria/*drug effects/*physiology/ultrastructure ; *Organelle Biogenesis ; Treatment Outcome ; }, abstract = {Mitochondrial dysfunction is associated with β-cell failure and insulin resistance in diabetes. Humanin is an endogenous cytoprotective peptide. In the current study, we aimed to define the effects of Humanin on mitochondrial biogenesis in pancreatic β-cells. Our findings demonstrated that Humanin treatment significantly increased the expression of PGC-1α and its downstream target genes NRF1 and TFAM in MIN6 β-cells. Notably, Humanin treatment significantly promoted mitochondrial biogenesis by increasing mitochondrial mass, elevating mtDNA/nDNA ratio, and stimulating the expression of cytochrome B, which were suppressed by the specific AMPK inhibitor compound C. Indeed, Humanin treatment caused the phosphorylation of AMPK, which was involved in the induction of PGC-1α, NRF1, and TFAM by Humanin. Importantly, our findings indicate that Humanin treatment led to a possible functional gain of the mitochondria by increasing ATP levels and respiratory rate. Our findings provided a new insight into the molecular mechanisms of action by which Humanin improves pancreatic β-cell function via enhanced mitochondrial mass and performance.}, }
@article {pmid29428509, year = {2018}, author = {Sahoo, RK and Lohman, DJ and Wahlberg, N and Müller, CJ and Brattström, O and Collins, SC and Peggie, D and Aduse-Poku, K and Kodandaramaiah, U}, title = {Evolution of Hypolimnas butterflies (Nymphalidae): Out-of-Africa origin and Wolbachia-mediated introgression.}, journal = {Molecular phylogenetics and evolution}, volume = {123}, number = {}, pages = {50-58}, doi = {10.1016/j.ympev.2018.02.001}, pmid = {29428509}, issn = {1095-9513}, mesh = {Africa ; Animals ; Base Sequence ; Bayes Theorem ; Biodiversity ; *Biological Evolution ; Butterflies/*genetics/*microbiology ; DNA, Mitochondrial/genetics ; Haplotypes/genetics ; Larva/physiology ; Likelihood Functions ; Mitochondria/genetics ; Phylogeny ; Phylogeography ; Sequence Analysis, DNA ; Wolbachia/*physiology ; }, abstract = {Hypolimnas butterflies (Nymphalidae), commonly known as eggflies, are a popular model system for studying a wide range of ecological questions including mimicry, polymorphism, wing pattern evolution, and Wolbachia-host interactions. The lack of a time-calibrated phylogeny for this group has precluded understanding its evolutionary history. We reconstruct a species-level phylogeny using a nine gene dataset and estimate species divergence times. Based on the resulting tree, we investigate the taxon's historical biogeography, examine the evolution of host plant preferences, and test the hypothesis that the endosymbiotic bacterium Wolbachia mediates gene transfer between species. Our analyses indicate that the species are grouped within three strongly supported, deeply divergent clades. However, relationships among these three clades are uncertain. In addition, many Hypolimnas species are not monophyletic or monophyletic with weak support, suggesting widespread incomplete lineage sorting and/or introgression. Biogeographic analysis strongly indicates that the genus diverged from its ancestor in Africa and subsequently dispersed to Asia; the strength of this result is not affected by topological uncertainties. While the larvae of African species feed almost exclusively on Urticaceae, larvae of species found further east often feed on several additional families. Interestingly, we found an identical mitochondrial haplotype in two Hypolimnas species, H. bolina and H. alimena, and a strong association between this mitotype and the Wolbachia strain wBol1a. Future investigations should explore the plausibility of Wolbachia-mediated introgression between species.}, }
@article {pmid29427777, year = {2019}, author = {Prager, M}, title = {Unweaving a taxon tangle: Comments on De Silva et al. (2017).}, journal = {Molecular phylogenetics and evolution}, volume = {131}, number = {}, pages = {229-232}, doi = {10.1016/j.ympev.2018.02.005}, pmid = {29427777}, issn = {1095-9513}, mesh = {Animals ; Biomarkers ; *Birds ; Cell Nucleus ; *Mitochondria ; Phylogeny ; }, }
@article {pmid29426933, year = {2018}, author = {Allu, PK and Boggula, Y and Karri, S and Marada, A and Krishnamoorthy, T and Sepuri, NBV}, title = {A conserved R type Methionine Sulfoxide Reductase reverses oxidized GrpEL1/Mge1 to regulate Hsp70 chaperone cycle.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {2716}, pmid = {29426933}, issn = {2045-2322}, abstract = {Cells across evolution employ reversible oxidative modification of methionine and cysteine amino acids within proteins to regulate responses to redox stress. Previously we have shown that mitochondrial localized methionine sulfoxide reductase (Mxr2) reversibly regulates oxidized yeast Mge1 (yMge1), a co-chaperone of Hsp70/Ssc1 to maintain protein homeostasis during oxidative stress. However, the specificity and the conservation of the reversible methionine oxidation mechanism in higher eukaryotes is debatable as human GrpEL1 (hGrpEL1) unlike its homolog yMge1 harbors two methionine residues and multiple cysteines besides the mammalian mitochondria hosting R and S types of Mxrs/Msrs. In this study, using yeast as a surrogate system, we show that hGRPEL1 and R type MSRs but not the S type MSRs complement the deletion of yeast MGE1 or MXR2 respectively. Our investigations show that R type Msrs interact selectively with oxidized hGrpEL1/yMge1 in an oxidative stress dependent manner, reduce the conserved hGrpEL1-Met146-SO and rescue the Hsp70 ATPase activity. In addition, a single point mutation in hGrpEL1-M146L rescues the slow growth phenotype of yeast MXR2 deletion under oxidative duress. Our study illustrates the evolutionarily conserved formation of specific Met-R-SO in hGrpEL1/yMge1 and the essential and canonical role of R type Msrs/Mxrs in mitochondrial redox mechanism.}, }
@article {pmid29424926, year = {2019}, author = {Sweetman, C and Soole, KL and Jenkins, CLD and Day, DA}, title = {Genomic structure and expression of alternative oxidase genes in legumes.}, journal = {Plant, cell &amp; environment}, volume = {42}, number = {1}, pages = {71-84}, doi = {10.1111/pce.13161}, pmid = {29424926}, issn = {1365-3040}, support = {Industrial Transformation Research Hub IH140100013//Australian Research Council/ ; //Grains Research and Development Corporation/ ; }, abstract = {Mitochondria isolated from chickpea (Cicer arietinum) possess substantial alternative oxidase (AOX) activity, even in non-stressed plants, and one or two AOX protein bands were detected immunologically, depending on the organ. Four different AOX isoforms were identified in the chickpea genome: CaAOX1 and CaAOX2A, B and D. CaAOX2A was the most highly expressed form and was strongly expressed in photosynthetic tissues, whereas CaAOX2D was found in all organs examined. These results are very similar to those of previous studies with soybean and siratro. Searches of available databases showed that this pattern of AOX genes and their expression was common to at least 16 different legume species. The evolution of the legume AOX gene family is discussed, as is the in vivo impact of an inherently high AOX capacity in legumes on growth and responses to environmental stresses.}, }
@article {pmid29417658, year = {2018}, author = {Pogoda, CS and Keepers, KG and Lendemer, JC and Kane, NC and Tripp, EA}, title = {Reductions in complexity of mitochondrial genomes in lichen-forming fungi shed light on genome architecture of obligate symbioses.}, journal = {Molecular ecology}, volume = {27}, number = {5}, pages = {1155-1169}, doi = {10.1111/mec.14519}, pmid = {29417658}, issn = {1365-294X}, mesh = {Biological Evolution ; Evolution, Molecular ; Fungal Proteins/genetics ; Fungi/genetics ; Genes, Fungal ; *Genome, Fungal ; *Genome, Mitochondrial ; Genomics ; Lichens/*genetics ; Phylogeny ; Polymorphism, Genetic ; Sequence Analysis, DNA ; Symbiosis/*genetics ; Synteny ; }, abstract = {Symbioses among co-evolving taxa are often marked by genome reductions such as a loss of protein-coding genes in at least one of the partners as a means of reducing redundancy or intergenomic conflict. To explore this phenomenon in an iconic yet under-studied group of obligate symbiotic organisms, mitochondrial genomes of 22 newly sequenced and annotated species of lichenized fungi were compared to 167 mitochondrial genomes of nonlichenized fungi. Our results demonstrate the first broad-scale loss of atp9 from mitochondria of lichenized fungi. Despite key functions in mitochondrial energy production, we show that atp9 has been independently lost in three different lineages spanning 10 of the 22 studied species. A search for predicted, functional copies of atp9 among genomes of other symbionts involved in each lichen revealed the full-length, presumably functional copies of atp9 in either the photosynthetic algal partner or in other symbiotic fungi in all 10 instances. Together, these data yield evidence of an obligate symbiotic relationship in which core genomic processes have been streamlined, likely due to co-evolution.}, }
@article {pmid29410353, year = {2018}, author = {Rose, JP and Kleist, TJ and Löfstrand, SD and Drew, BT and Schönenberger, J and Sytsma, KJ}, title = {Phylogeny, historical biogeography, and diversification of angiosperm order Ericales suggest ancient Neotropical and East Asian connections.}, journal = {Molecular phylogenetics and evolution}, volume = {122}, number = {}, pages = {59-79}, doi = {10.1016/j.ympev.2018.01.014}, pmid = {29410353}, issn = {1095-9513}, mesh = {Animals ; *Biodiversity ; Chloroplasts/genetics ; Far East ; Fossils/history ; Genetic Speciation ; History, Ancient ; Magnoliopsida/*classification/genetics ; Mitochondria/genetics ; *Phylogeny ; Phylogeography/history ; Ribosomes/genetics ; }, abstract = {Inferring interfamilial relationships within the eudicot order Ericales has remained one of the more recalcitrant problems in angiosperm phylogenetics, likely due to a rapid, ancient radiation. As a result, no comprehensive time-calibrated tree or biogeographical analysis of the order has been published. Here, we elucidate phylogenetic relationships within the order and then conduct time-dependent biogeographical and diversification analyses by using a taxon and locus-rich supermatrix approach on one-third of the extant species diversity calibrated with 23 macrofossils and two secondary calibration points. Our results corroborate previous studies and also suggest several new but poorly supported relationships. Newly suggested relationships are: (1) holoparasitic Mitrastemonaceae is sister to Lecythidaceae, (2) the clade formed by Mitrastemonaceae + Lecythidaceae is sister to Ericales excluding balsaminoids, (3) Theaceae is sister to the styracoids + sarracenioids + ericoids, and (4) subfamilial relationships with Ericaceae suggest that Arbutoideae is sister to Monotropoideae and Pyroloideae is sister to all subfamilies excluding Arbutoideae, Enkianthoideae, and Monotropoideae. Our results indicate Ericales began to diversify 110 Mya, within Indo-Malaysia and the Neotropics, with exchange between the two areas and expansion out of Indo-Malaysia becoming an important area in shaping the extant diversity of many families. Rapid cladogenesis occurred along the backbone of the order between 104 and 106 Mya. Jump dispersal is important within the order in the last 30 My, but vicariance is the most important cladogenetic driver of disjunctions at deeper levels of the phylogeny. We detect between 69 and 81 shifts in speciation rate throughout the order, the vast majority of which occurred within the last 30 My. We propose that range shifting may be responsible for older shifts in speciation rate, but more recent shifts may be better explained by morphological innovation.}, }
@article {pmid29408286, year = {2018}, author = {Yuan, ML and Zhang, QL and Zhang, L and Jia, CL and Li, XP and Yang, XZ and Feng, RQ}, title = {Mitochondrial phylogeny, divergence history and high-altitude adaptation of grassland caterpillars (Lepidoptera: Lymantriinae: Gynaephora) inhabiting the Tibetan Plateau.}, journal = {Molecular phylogenetics and evolution}, volume = {122}, number = {}, pages = {116-124}, doi = {10.1016/j.ympev.2018.01.016}, pmid = {29408286}, issn = {1095-9513}, mesh = {*Adaptation, Physiological/genetics ; *Altitude ; Animals ; Biodiversity ; DNA/chemistry/isolation &amp; purification/metabolism ; Grassland ; Mitochondria/*genetics ; Moths/*classification/genetics ; Open Reading Frames/genetics ; *Phylogeny ; Sequence Analysis, DNA ; Tibet ; }, abstract = {Grassland caterpillars (Lepidoptera: Lymantriinae: Gynaephora) are the most important pests in alpine meadows of the Tibetan Plateau (TP) and have well adapted to high-altitude environments. To further understand the evolutionary history and their adaptation to the TP, we newly determined seven complete TP Gynaephora mitogenomes. Compared to single genes, whole mitogenomes provided the best phylogenetic signals and obtained robust results, supporting the monophyly of the TP Gynaephora species and a phylogeny of Arctiinae + (Aganainae + Lymantriinae). Incongruent phylogenetic signals were found among single mitochondrial genes, none of which recovered the same phylogeny as the whole mitogenome. We identified six best-performing single genes using Shimodaira-Hasegawa tests and found that the combinations of rrnS and either cox1 or cox3 generated the same phylogeny as the whole mitogenome, indicating the phylogenetic potential of these three genes for future evolutionary studies of Gynaephora. The TP Gynaephora species were estimated to radiate on the TP during the Pliocene and Quaternary, supporting an association of the diversification and speciation of the TP Gynaephora species with the TP uplifts and associated climate changes during this time. Selection analyses revealed accelerated evolutionary rates of the mitochondrial protein-coding genes in the TP Gynaephora species, suggesting that they accumulated more nonsynonymous substitutions that may benefit their adaptation to high altitudes. Furthermore, signals of positive selection were detected in nad5 of two Gynaephora species with the highest altitude-distributions, indicating that this gene may contribute to Gynaephora's adaptation to divergent altitudes. This study adds to the understanding of the TP Gynaephora evolutionary relationships and suggests a link between mitogenome evolution and ecological adaptation to high-altitude environments in grassland caterpillars.}, }
@article {pmid29404746, year = {2018}, author = {Jaleta, TG and Rödelsperger, C and Abanda, B and Eisenbarth, A and Achukwi, MD and Renz, A and Streit, A}, title = {Full mitochondrial and nuclear genome comparison confirms that Onchocerca sp. &quot;Siisa&quot; is Onchocerca ochengi.}, journal = {Parasitology research}, volume = {117}, number = {4}, pages = {1069-1077}, pmid = {29404746}, issn = {1432-1955}, support = {AOBJ:602317//Deutsche Forschungsgemeinschaft/ ; N/A//Max-Planck-Gesellschaft/ ; }, mesh = {Animals ; Cattle/parasitology ; Cattle Diseases/parasitology ; Genome, Mitochondrial/*genetics ; Genome, Protozoan/*genetics ; Humans ; Insect Vectors/parasitology ; Mitochondria/genetics ; Onchocerca/*classification/*genetics/isolation &amp; purification ; Onchocerciasis/parasitology ; Phylogeny ; Polymorphism, Single Nucleotide/genetics ; Simuliidae/parasitology ; Skin/parasitology ; }, abstract = {Onchocerca ochengi is a nodule-forming filarial nematode parasite of cattle. It is the closest known relative of the human parasite Onchocerca volvulus, with which it shares the black fly vector Simulium damnosum. Onchocerca sp. &quot;Siisa&quot; was described in black flies and in cattle and, based on limited mitochondrial sequence information, appeared to be about equally phylogenetically distant from O. ochengi and O. volvulus. Based on molecular genetic markers and apparent interbreeding, we later proposed that O. sp. &quot;Siisa&quot; belongs to the species O. ochengi. However, we did not demonstrate directly that the hybrids were fertile, and we were still unable to resolve the phylogenetic relationship of O. ochengi, O. sp. &quot;Siisa,&quot; and O. volvulus, leaving some concerns with the conclusion mentioned above. Here, we present fully assembled, manually curated mitochondrial genomes of O. ochengi and O. sp. &quot;Siisa,&quot; and we compare multiple individuals of these two taxa with respect to their whole mitochondrial and nuclear genomes. Based on the mitochondrial genomes, O. ochengi and O. sp. &quot;Siisa&quot; are phylogenetically much closer to each other than to O. volvulus. The differences between them are well within the range of what is expected for within-species variation. The nuclear genome comparison provided no indication of genetic separation of O. ochengi and O. sp. &quot;Siisa.&quot; From this, in combination with the earlier literature, we conclude that O. ochengi and O. sp. &quot;Siisa&quot; should be considered one species.}, }
@article {pmid29401406, year = {2018}, author = {Abboud, TG and Zubaer, A and Wai, A and Hausner, G}, title = {The complete mitochondrial genome of the Dutch elm disease fungus Ophiostoma novo-ulmi subsp. novo-ulmi.}, journal = {Canadian journal of microbiology}, volume = {64}, number = {5}, pages = {339-348}, doi = {10.1139/cjm-2017-0605}, pmid = {29401406}, issn = {1480-3275}, mesh = {Base Sequence ; DNA, Mitochondrial/genetics ; Evolution, Molecular ; Fungal Proteins/genetics ; Genes, Fungal ; *Genome, Mitochondrial ; Mitochondria/genetics ; Open Reading Frames ; Ophiostoma/*genetics ; Phylogeny ; Plant Diseases/*microbiology ; Ulmus/microbiology ; }, abstract = {Ophiostoma novo-ulmi, a member of the Ophiostomatales (Ascomycota), is the causal agent of the current Dutch elm disease pandemic in Europe and North America. The complete mitochondrial genome (mtDNA) of Ophiostoma novo-ulmi subsp. novo-ulmi, the European component of O. novo-ulmi, has been sequenced and annotated. Gene order (synteny) among the currently available members of the Ophiostomatales was examined and appears to be conserved, and mtDNA size variability among the Ophiostomatales is due in part to the presence of introns and their encoded open reading frames. Phylogenetic analysis of concatenated mitochondrial protein-coding genes yielded phylogenetic estimates for various members of the Ophiostomatales, with strong statistical support showing that mtDNA analysis may provide valuable insights into the evolution of the Ophiostomatales.}, }
@article {pmid29385875, year = {2018}, author = {Mustafa, SI and Schwarzacher, T and Heslop-Harrison, JS}, title = {Complete mitogenomes from Kurdistani sheep: abundant centromeric nuclear copies representing diverse ancestors.}, journal = {Mitochondrial DNA. Part A, DNA mapping, sequencing, and analysis}, volume = {29}, number = {8}, pages = {1180-1193}, doi = {10.1080/24701394.2018.1431226}, pmid = {29385875}, issn = {2470-1408}, mesh = {Animals ; Breeding ; Centromere/*genetics ; *Evolution, Molecular ; Female ; *Genetic Speciation ; *Genome, Mitochondrial ; Male ; Polymorphism, Single Nucleotide ; Sex Chromosomes/genetics ; Sheep/*genetics ; }, abstract = {The geographical centre of domestication and species diversity for sheep (Ovis aries) lies around the Kurdistan region of Northern Iraq, within the 'Fertile Crescent'. From whole genome sequence reads, we assembled the mitochondrial genomes (mtDNA or mitogenome) of five animals of the two main Kurdistani sheep breeds Hamdani and Karadi and found they fitted into known sheep haplogroups (or matrilineages), with some SNPs. Haplotyping 31 animals showed presence of the main Asian (hpgA) and European (hpgB) haplogroups, as well as the rarer Anatolian haplogroup hpgC. From the sequence reads, near-complete genomes of mitochondria from wild sheep species (or subspecies), and even many sequences similar to goat (Capra) mitochondria, could be extracted. Analysis suggested that these polymorphic reads were nuclear mitochondrial DNA segments (numts). In situ hybridization with seven regions of mitochondria chosen from across the whole genome showed strong hybridization to the centromeric regions of all autosomal sheep chromosomes, but not the Y. Centromeres of the three submetacentric pairs and the X chromosomes showed fewer copies of numts, with varying abundance of different mitochondrial regions. Some mitochondrial-nuclear transfer presumably occurred before species divergence within the genus, and there has been further introgression of sheep mitochondrial sequences more recently. This high abundance of nuclear mitochondrial sequences is not reflected in the whole nuclear genome assemblies, and the accumulation near major satellite sequences at centromeres was unexpected. Mitochondrial variants including SNPs, numts and heteroplasmy must be rigorously validated to interpret correctly mitochondrial phylogenies and SNPs.}, }
@article {pmid29383422, year = {2018}, author = {Yu, H and Wang, D and Zou, L and Zhang, Z and Xu, H and Zhu, F and Ren, X and Xu, B and Yuan, J and Liu, J and Spencer, PS and Yang, X}, title = {Proteomic alterations of brain subcellular organelles caused by low-dose copper exposure: implication for Alzheimer's disease.}, journal = {Archives of toxicology}, volume = {92}, number = {4}, pages = {1363-1382}, doi = {10.1007/s00204-018-2163-6}, pmid = {29383422}, issn = {1432-0738}, support = {2014A030313715//National Natural Science Foundation of China/ ; }, abstract = {Excessive copper intake can lead to neurotoxicity, but there is a lack of comprehensive understanding on the potential impact of copper exposure especially at a low-dose on brain. We used 3xTg-AD mice to explore the potential neurotoxicity of chronic, low-dose copper treatment (0.13 ppm copper chloride in drinking water) on behavior and the brain hippocampal mitochondrial and nuclear proteome. Low-dose copper increased the spatial memory impairment of these animals, increased accumulation of intracellular amyloid 1-42 (Aβ1-42), decreased ATP content, increased the positive staining of 8-hydroxyguanosine (8-OHdG), a marker of DNA oxidative damage, and caused apoptosis and a decrease in synaptic proteins. Mitochondrial proteomic analysis by two-dimensional fluorescence difference gel electrophoresis (2D-DIGE) revealed modulation of 24 hippocampal mitochondrial proteins (14 increased and 10 decreased) in copper-treated vs. untreated 3xTg-AD mice. Nuclear proteomic analysis revealed 43 modulated hippocampal nuclear proteins (25 increased and 18 decreased) in copper-treated 3xTg-AD vs. untreated mice. Classification of modulated mitochondrial and nuclear proteins included functional categories such as energy metabolism, synaptic-related proteins, DNA damage and apoptosis-related proteins, and oxidative stress-related proteins. Among these differentially expressed mitochondrial and nuclear proteins, nine proteins were abnormally expressed in both hippocampus mitochondria and nuclei, including electron transport chain-related proteins NADH dehydrogenase 1 alpha subcomplex subunit 10 (NDUAA), cytochrome b-c1 complex subunit Rieske (UCRI), cytochrome c oxidase subunit 5B (COX5B), and ATP synthase subunit d (ATP5H), glycolytic-related pyruvate kinase PKM (KPYM) and pyruvate dehydrogenase E1 component subunit alpha (ODPA). Furthermore, we found coenzyme Q10 (CoQ10), an endogenous mitochondrial protective factor/antioxidant, modulated the expression of 12 differentially expressed hippocampal proteins (4 increased and 8 decreased), which could be classified in functional categories such as glycolysis and synaptic-related proteins, oxidative stress-related proteins, implying that CoQ10 improved synaptic function, suppress oxidative stress, and regulate glycolysis. For the proteomics study, we validated the expression of several proteins related to synapses, DNA and apoptosis. The data confirmed that synapsin-2, a synaptic-related protein, was significantly decreased in both mitochondria and nuclei of copper-exposed 3xTg-AD mice. In mitochondria, dynamin-1 (DYN1), an apoptosis-related proteins, was significantly decreased. In the cellular nuclei, paraspeckle protein 1 (PSPC1) and purin-rich element-binding protein alpha (Purα), two DNA damage-related proteins, were significantly decreased and increased, respectively. We conclude that low-dose copper exposure exacerbates the spatial memory impairment of 3xTg-AD mice and perturbs multiple biological/pathogenic processes by dysregulating the mitochondrial and nuclear proteome. Exposure to copper might therefore contribute to the evolution of AD.}, }
@article {pmid29382768, year = {2018}, author = {Zachar, I and Szilágyi, A and Számadó, S and Szathmáry, E}, title = {Farming the mitochondrial ancestor as a model of endosymbiotic establishment by natural selection.}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {115}, number = {7}, pages = {E1504-E1510}, pmid = {29382768}, issn = {1091-6490}, support = {294332//European Research Council/International ; }, mesh = {Animals ; Bacteria/pathogenicity ; *Biological Evolution ; Computational Biology ; Erythrocytes/*microbiology ; Eukaryota ; Humans ; Mitochondria/*physiology ; *Models, Biological ; Predatory Behavior ; *Selection, Genetic ; Symbiosis/*physiology ; }, abstract = {The origin of mitochondria was a major evolutionary transition leading to eukaryotes, and is a hotly debated issue. It is unknown whether mitochondria were acquired early or late, and whether it was captured via phagocytosis or syntrophic integration. We present dynamical models to directly simulate the emergence of mitochondria in an ecoevolutionary context. Our results show that regulated farming of prey bacteria and delayed digestion can facilitate the establishment of stable endosymbiosis if prey-rich and prey-poor periods alternate. Stable endosymbiosis emerges without assuming any initial metabolic benefit provided by the engulfed partner, in a wide range of parameters, despite that during good periods farming is costly. Our approach lends support to the appearance of mitochondria before any metabolic coupling has emerged, but after the evolution of primitive phagocytosis by the urkaryote.}, }
@article {pmid29381758, year = {2018}, author = {Song, N and Lin, A and Zhao, X}, title = {Insight into higher-level phylogeny of Neuropterida: Evidence from secondary structures of mitochondrial rRNA genes and mitogenomic data.}, journal = {PloS one}, volume = {13}, number = {1}, pages = {e0191826}, pmid = {29381758}, issn = {1932-6203}, mesh = {Animals ; Genes, Insect ; *Genome, Mitochondrial ; Mitochondria/*genetics ; Neoptera/*classification/genetics ; Nucleic Acid Conformation ; *Phylogeny ; RNA, Ribosomal/*genetics ; }, abstract = {It is well known that the rRNA structure information is important to assist phylogenetic analysis through identifying homologous positions to improve alignment accuracy. In addition, the secondary structure of some conserved motifs is highly stable among distantly related taxa, which can provide potentially informative characters for estimating phylogeny. In this paper, we applied the high-throughput pooled sequencing approach to the determination of neuropteran mitogenomes. Four complete mitogenome sequences were obtained: Micromus angulatus (Hemerobiidae), Chrysoperla nipponensis (Chrysopidae), Rapisma sp. (Ithonidae), and Thaumatosmylus sp. (Osmylidae). This allowed us to sample more complete mitochondrial RNA gene sequences. Secondary structure diagrams for the complete mitochondrial small and large ribosomal subunit RNA genes of eleven neuropterid species were predicted. Comparative analysis of the secondary structures indicated a closer relationship of Megaloptera and Neuroptera. This result was congruent with the resulting phylogeny inferred from sequence alignments of all 37 mitochondrial genes, namely the hypothesis of (Raphidioptera + (Megaloptera + Neuroptera)).}, }
@article {pmid29374514, year = {2018}, author = {Godahewa, GI and Perera, NCN and Nam, BH and Lee, J}, title = {Antioxidative properties and structural features of atypical 2-Cys peroxiredoxin from Sebastes schlegelii.}, journal = {Developmental and comparative immunology}, volume = {82}, number = {}, pages = {152-164}, doi = {10.1016/j.dci.2018.01.015}, pmid = {29374514}, issn = {1879-0089}, mesh = {Animals ; Antioxidants ; Cloning, Molecular ; Cysteine/genetics ; Fish Proteins/*genetics/metabolism ; Fishes/*metabolism ; Gills/*metabolism ; Insulin/metabolism ; Liver/*metabolism ; Mitochondria/*metabolism ; Oxidation-Reduction ; Oxidative Stress ; Peroxiredoxins/*genetics/metabolism ; Phylogeny ; Reactive Oxygen Species/metabolism ; Streptococcal Infections/*immunology ; Streptococcus iniae/*immunology ; Structure-Activity Relationship ; Transcriptome ; Vertebrates ; }, abstract = {Atypical 2-Cys peroxiredoxin (Prx5) is an antioxidant protein that exerts its antioxidant function by detoxifying different reactive oxygen species (ROS). Here, we identified mitochondrial Prx5 from rockfish (SsPrx5) and described its specific structural and functional characteristics. The open reading frame (ORF) of SsPrx5 (570 bp) was translated into a 190-amino acid polypeptide that contained a mitochondrial targeting sequence (MTS), thioredoxin 2 domain, two Prx-specific signature motifs, and three conserved cysteine residues. Sequence comparison indicated that the SsPrx5 protein sequence shared greatest identity with teleost orthologs, where the phylogenetic results showed an evolutionary position within the fish Prx5. The coding sequence of SsPrx5 was scattered in six exons as found in other vertebrates. Additionally, the potent antioxidant functions of recombinantly expressed SsPrx5 protein was demonstrated by insulin reduction and extracellular H2O2 scavenging both in vitro and in vivo. Quantitative real time PCR (qPCR) detected ubiquitous mRNA expression of SsPrx5 in healthy rockfish tissues, with remarkable expression observed in gill, liver, and reproductive tissues. Prompt transcription of SsPrx5 was shown in the immune-stimulated gill and liver tissues against Streptococcus iniae and lipopolysaccharide injection. Taken together, present results suggest the indispensable role of SsPrx5 in the rockfish antioxidant defense system against oxidative stresses and its role in maintaining redox balance upon pathogen invasion.}, }
@article {pmid29374209, year = {2018}, author = {Giordano, L and Sillo, F and Garbelotto, M and Gonthier, P}, title = {Mitonuclear interactions may contribute to fitness of fungal hybrids.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {1706}, pmid = {29374209}, issn = {2045-2322}, mesh = {*Adaptation, Biological ; Basidiomycota/*genetics/*growth &amp; development ; DNA, Mitochondrial/*genetics ; *Genetic Fitness ; *Hybrid Vigor ; *Recombination, Genetic ; }, abstract = {Hybridization between species is being recognized as a major force in the rapid adaptive evolution of fungal plant pathogens. The first stages of interspecific hybridization necessarily involve nuclear-mitochondrial chimeras. In their 2001 publication, Olson and Stenlid reported that mitochondria control the virulence of first generation hybrids between the North American fungal pathogen Heterobasidion irregulare and its congeneric H. occidentale. By assessing saprobic ability and gene expression of H. irregulare × H. annosum sensu stricto hybrids and of their parental genotypes, we demonstrate that mitochondria also influence saprobic growth of hybrids. Moreover, gene expression data suggest that fungal fitness is modulated by an intimate interplay between nuclear genes and mitochondrial type, and is dependent on the specific mitonuclear combination.}, }
@article {pmid29370159, year = {2018}, author = {Lane, N}, title = {Hot mitochondria?.}, journal = {PLoS biology}, volume = {16}, number = {1}, pages = {e2005113}, pmid = {29370159}, issn = {1545-7885}, mesh = {Animals ; Energy Metabolism ; Fluorescent Dyes ; Hot Temperature ; Humans ; Membrane Proteins ; Mitochondria/*physiology ; Temperature ; Thermogenesis/*physiology ; Xanthenes ; }, abstract = {Mitochondria generate most of the heat in endotherms. Given some impedance of heat transfer across protein-rich bioenergetic membranes, mitochondria must operate at a higher temperature than body temperature in mammals and birds. But exactly how much hotter has been controversial, with physical calculations suggesting that maximal heat gradients across cells could not be greater than 10(-5) K. Using the thermosensitive mitochondrial-targeted fluorescent dye Mito Thermo Yellow (MTY), Chrétien and colleagues suggest that mitochondria are optimised to nearly 50 °C, 10 °C hotter than body temperature. This extreme value questions what temperature really means in confined far-from-equilibrium systems but encourages a reconsideration of thermal biology.}, }
@article {pmid29362421, year = {2018}, author = {Carreras, C and Pascual, M and Tomás, J and Marco, A and Hochscheid, S and Castillo, JJ and Gozalbes, P and Parga, M and Piovano, S and Cardona, L}, title = {Sporadic nesting reveals long distance colonisation in the philopatric loggerhead sea turtle (Caretta caretta).}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {1435}, pmid = {29362421}, issn = {2045-2322}, mesh = {Animals ; Biological Evolution ; DNA, Mitochondrial/*genetics ; Ecosystem ; Mediterranean Sea ; *Microsatellite Repeats ; Mitochondria/genetics ; *Nesting Behavior ; Population Dynamics ; Sequence Analysis, DNA/*methods ; Temperature ; Turtles/genetics/*physiology ; }, abstract = {The colonisation of new suitable habitats is crucial for species survival at evolutionary scale under changing environmental conditions. However, colonisation potential may be limited by philopatry that facilitates exploiting successful habitats across generations. We examine the mechanisms of long distance dispersal of the philopatric loggerhead sea turtle (Caretta caretta) by analysing 40 sporadic nesting events in the western Mediterranean. The analysis of a fragment of the mitochondrial DNA and 7 microsatellites of 121 samples from 18 of these nesting events revealed that these nests were colonising events associated with juveniles from distant populations feeding in nearby foraging grounds. Considering the temperature-dependent sex determination of the species, we simulated the effect of the incubation temperature and propagule pressure on a potential colonisation scenario. Our results indicated that colonisation will succeed if warm temperature conditions, already existing in some of the beaches in the area, extend to the whole western Mediterranean. We hypothesize that the sporadic nesting events in developmental foraging grounds may be a mechanism to overcome philopatry limitations thus increasing the dispersal capabilities of the species and the adaptability to changing environments. Sporadic nesting in the western Mediterranean can be viewed as potential new populations in a scenario of rising temperatures.}, }
@article {pmid29360606, year = {2018}, author = {Hou, CC and Gao, XM and Ni, J and Mu, DL and Yang, HY and Liu, C and Zhu, JQ}, title = {The expression pattern and potential functions of PHB in the spermiogenesis of Phascolosoma esculenta.}, journal = {Gene}, volume = {652}, number = {}, pages = {25-38}, doi = {10.1016/j.gene.2018.01.056}, pmid = {29360606}, issn = {1879-0038}, mesh = {Amino Acid Sequence ; Animals ; Base Sequence ; Cloning, Molecular ; Escherichia coli/genetics/metabolism ; Gene Expression ; Genetic Vectors/chemistry/metabolism ; Male ; Mitochondria/*metabolism ; Mitochondrial Membranes/metabolism ; Mitochondrial Proteins/chemistry/*genetics/metabolism ; Models, Molecular ; Phylogeny ; Polychaeta/classification/*genetics/growth &amp; development/metabolism ; Polyubiquitin/genetics/metabolism ; Protein Domains ; Protein Structure, Secondary ; Recombinant Proteins/chemistry/genetics/metabolism ; Repressor Proteins/chemistry/*genetics/metabolism ; Sequence Alignment ; Sequence Homology, Amino Acid ; Spermatogenesis/*genetics ; Spermatozoa/growth &amp; development/*metabolism ; }, abstract = {Prohibitin (PHB) is a ubiquitous, evolutionarily conserved protein that is mainly localized in the inner mitochondrial membrane and exerts various mitochondrial functions. Here, we first cloned the phb gene from P. esculenta. The Pe-PHB protein has high homology and a similar protein structure to that of other animals, and it can be divided into the N-terminal hydrophobic/transmembrane domain, SPFH domain, and C-terminal coiled-coil domain. The Pe-phb gene is widely expressed, and the gene expression of phb is highest in coelomic fluid where spermiogenesis occurs, indicating a specific function in the coelom. We further observed continuous expression of the phb gene and localization of PHB proteins in mitochondria during spermiogenesis, indicating that PHB, as a mitochondrial component, may play a role during this process via its mitochondrial function. In addition, ubiquitination of mitochondria was detected, and the PHB signal was co-localized with the poly-ubiquitin signal during spermiogenesis. Mature sperm also showed ubiquitination of mitochondria and PHB. Therefore, PHB may be a substrate of poly-ubiquitin to regulate the ubiquitination of mitochondria and even subsequent elimination during P. esculenta spermiogenesis, and it has a potential role in guaranteeing the maternal inheritance of mitochondria. Taken together, these results support the hypothesis that PHB participates in the spermiogenesis of P. esculenta by maintaining the normal function of mitochondria and regulating the degradation of mitochondria.}, }
@article {pmid29359358, year = {2018}, author = {Zhang, MY and Wei, D and Li, R and Jia, HT and Liu, YW and Taning, CNT and Wang, JJ and Smagghe, G}, title = {Cytoplasmic glutamine synthetase gene expression regulates larval development in Bactrocera dorsalis (Hendel).}, journal = {Archives of insect biochemistry and physiology}, volume = {97}, number = {4}, pages = {}, doi = {10.1002/arch.21447}, pmid = {29359358}, issn = {1520-6327}, mesh = {Amino Acid Sequence ; Animals ; Female ; Glutamate-Ammonia Ligase/genetics/*metabolism ; Insect Proteins/metabolism ; Larva/enzymology/growth &amp; development ; Methionine Sulfoximine ; Phylogeny ; RNA Interference ; Tephritidae/*enzymology/genetics/*growth &amp; development ; }, abstract = {In insects, glutamine synthetase (GS), a key enzyme in the synthesis of glutamine, has been reported to be associated with embryonic development, heat shock response, and fecundity regulation. However, little is known about the influence of GS on postembryonic development. In this study, we demonstrate that blocking the activity of GS in the oriental fruit fly (Bactrocera dorsalis) with use of a GS-specific inhibitor (L-methionine S-sulfoximine), led to a significant delay in larval development, pupal weight loss, and inhibition of pupation. We further identify cloned and characterized two GS genes (BdGS-c and BdGS-m) from B. dorsalis. The two GS genes identified in B. dorsalis were predicted to be located in the cytosol (BdGS-c) and mitochondria (BdGS-m), and homology analysis indicated that both genes were similar to homologs from other Dipterans, such as Drosophila melanogaster and Aedes aegypti. BdGS-c was highly expressed in the larval stages, suggesting that cytosolic GS plays a predominant role in larval development. Furthermore, RNA interference experiments against BdGS-c, to specifically decrease the expression of cytosolic GS, resulted in delay in larval development as well as pupal weight loss. This study presents the prominent role played by BdGS-c in regulating larval development and suggests that the observed effect could have been modulated through ecdysteroid synthesis, agreeing with the reduced expression of the halloween gene spook. Also, the direct effects of BdGS-c silencing on B. dorsalis, such as larval lethality, delayed pupation, and late emergence, can be further exploited as novel insecticide target in the context of pest management.}, }
@article {pmid29359182, year = {2018}, author = {Shevade, A and Strogolova, V and Orlova, M and Yeo, CT and Kuchin, S}, title = {Mitochondrial Voltage-Dependent Anion Channel Protein Por1 Positively Regulates the Nuclear Localization of Saccharomyces cerevisiae AMP-Activated Protein Kinase.}, journal = {mSphere}, volume = {3}, number = {1}, pages = {}, pmid = {29359182}, issn = {2379-5042}, abstract = {Snf1 protein kinase of the yeast Saccharomyces cerevisiae is a member of the highly conserved eukaryotic AMP-activated protein kinase (AMPK) family, which is involved in regulating responses to energy limitation. Under conditions of carbon/energy stress, such as during glucose depletion, Snf1 is catalytically activated and enriched in the nucleus to regulate transcription. Snf1 catalytic activation requires phosphorylation of its conserved activation loop threonine (Thr210) by upstream kinases. Catalytic activation is also a prerequisite for Snf1's subsequent nuclear enrichment, a process that is mediated by Gal83, one of three alternate β-subunits of the Snf1 kinase complex. We previously reported that the mitochondrial voltage-dependent anion channel (VDAC) proteins Por1 and Por2 play redundant roles in promoting Snf1 catalytic activation by Thr210 phosphorylation. Here, we show that the por1Δ mutation alone, which by itself does not affect Snf1 Thr210 phosphorylation, causes defects in Snf1 and Gal83 nuclear enrichment and Snf1's ability to stimulate transcription. We present evidence that Por1 promotes Snf1 nuclear enrichment by promoting the nuclear enrichment of Gal83. Overexpression of Por2, which is not believed to have channel activity, can suppress the localization and transcription activation defects of the por1Δ mutant, suggesting that the regulatory role played by Por1 is separable from its channel function. Thus, our findings expand the positive roles of the yeast VDACs in carbon/energy stress signaling upstream of Snf1. Since AMPK/Snf1 and VDAC proteins are conserved in evolution, our findings in yeast may have implications for AMPK regulation in other eukaryotes, including humans. IMPORTANCE AMP-activated protein kinases (AMPKs) sense energy limitation and regulate transcription and metabolism in eukaryotes from yeast to humans. In mammals, AMPK responds to increased AMP-to-ATP or ADP-to-ATP ratios and is implicated in diabetes, heart disease, and cancer. Mitochondria produce ATP and are generally thought to downregulate AMPK. Indeed, some antidiabetic drugs activate AMPK by affecting mitochondrial respiration. ATP release from mitochondria is mediated by evolutionarily conserved proteins known as voltage-dependent anion channels (VDACs). One would therefore expect VDACs to serve as negative regulators of AMPK. However, our experiments in yeast reveal the existence of an opposite relationship. We previously showed that Saccharomyces cerevisiae VDACs Por1 and Por2 positively regulate AMPK/Snf1 catalytic activation. Here, we show that Por1 also plays an important role in promoting AMPK/Snf1 nuclear localization. Our counterintuitive findings could inform research in areas ranging from diabetes to cancer to fungal pathogenesis.}, }
@article {pmid29358597, year = {2018}, author = {Eimanifar, A and Kimball, RT and Braun, EL and Ellis, JD}, title = {Mitochondrial genome diversity and population structure of two western honey bee subspecies in the Republic of South Africa.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {1333}, pmid = {29358597}, issn = {2045-2322}, mesh = {Animals ; Bees/*classification/cytology/genetics ; Evolution, Molecular ; Genetic Variation ; *Genome, Mitochondrial ; Haplotypes ; Introduced Species ; Mitochondria/*genetics ; Phylogeny ; Sequence Analysis, DNA/*methods ; South Africa ; }, abstract = {Apis mellifera capensis Eschscholtz and A.m. scutellata Lepeletier are subspecies of western honey bees that are indigenous to the Republic of South Africa (RSA). Both subspecies have invasive potential and are organisms of concern for areas outside their native range, though they are important bees to beekeepers, agriculture, and the environment where they are native. The aim of the present study was to examine genetic differentiation among these subspecies and estimate their phylogenetic relationships using complete mitochondrial genomes sequences. We used 25 individuals that were either assigned to one of the subspecies or designated hybrids using morphometric analyses. Phylogenetic analyses of mitogenome sequences by maximum likelihood (ML) and Bayesian inference identified a monophyletic RSA clade, subdivided into two clades. A haplotype network was consistent with the phylogenetic trees. However, members of both subspecies occurred in both clades, indicating that A.m. capensis and A.m. scutellata are neither reciprocally monophyletic nor do they exhibit paraphyly with one subspecies nested within the other subspecies. Furthermore, no mitogenomic features were diagnostic to either subspecies. All bees analyzed from the RSA expressed a substantial level of haplotype diversity (most samples had unique haplotypes) but limited nucleotide diversity. The number of variable codons across protein-coding genes (PCGs) differed among loci, with CO3 exhibiting the most variation and ATP6 the least.}, }
@article {pmid29356455, year = {2017}, author = {Antunes, CD and Lucena, MN and Garçon, DP and Leone, FA and McNamara, JC}, title = {Low salinity-induced alterations in epithelial ultrastructure, Na+/K+-ATPase immunolocalization and enzyme kinetic characteristics in the gills of the thinstripe hermit crab, Clibanarius vittatus (Anomura, Diogenidae).}, journal = {Journal of experimental zoology. Part A, Ecological and integrative physiology}, volume = {327}, number = {6}, pages = {380-397}, doi = {10.1002/jez.2109}, pmid = {29356455}, issn = {2471-5646}, mesh = {Animals ; Anomura/*drug effects/physiology ; Enzymes/*metabolism ; Epithelial Cells ; Epithelium/*ultrastructure ; Gills/*drug effects/physiology ; Protein Transport/drug effects/physiology ; *Salinity ; Sodium/chemistry/pharmacology ; Sodium-Potassium-Exchanging ATPase/*metabolism ; }, abstract = {Fresh caught Clibanarius vittatus [SW, 31‰ salinity (S)] were acclimated to a dilute medium (15‰ S) for 10 days, employing silver staining to locate gill ion transporting tissue, immunofluorescence to localize the Na+/K+-ATPase α-subunit in the lamellae, and electron microscopy to portray ultrastructural changes in the gill epithelia. Na+/K+-ATPase activity was characterized kinetically in a gill microsomal fraction, including synergistic stimulation by NH4+ plus K+. Silver staining revealed that all 26 phyllobranchiate arthro- and pleurobranchiae participate in ion transport. Na+/K+-ATPase α-subunit staining was weak in SW crabs and distributed exclusively and irregularly within the intralamellar septal cells, particularly at the septal-pillar cell body junctions, and septal cell cytoplasm facing the hemolymph space. In 15‰ S crabs, α-subunit localization was intense, occupying the entire thickened septum. Pillar cells and flanges did not stain. Mitochondria and membrane foldings increased in the pillar cell flanges and intralamellar septal cells, greatly amplifying surface area. Only a single ATP binding site (VM = 130.8 ± 10.5 nmol min-1 mg protein-1; K0.5 = 55.3 ± 1.7 μmol l-1) obeying Michaelis-Menten kinetics was disclosed. Na+/K+-ATPase activity was modulated by Mg2+, Na+, and NH4+, exhibiting site-site interactions; K+ modulation showed Michaelis-Menten kinetics. K+ plus NH4+ synergistically stimulated activity ≈ 1.7-fold. Ouabain inhibited total ATPase activity by ≈ 70% (KI = 220-300 μmol l-1), revealing phosphohydrolytic activities other than the Na+/K+-ATPase. Despite ample phylogenetic separation, the phyllobranchiate lamellae of the Anomura and Caridea share many ultrastructural features, that is, an intralamellar septum and opposed abutting pillar cells, similar Na+/K+-ATPase distribution, and comparable kinetic characteristics. These findings suggest either convergent evolution at the structural and biochemical levels, or preservation of traits present in a remote common ancestor.}, }
@article {pmid29343698, year = {2018}, author = {Li, X and Zhou, TC and Wu, CH and Tao, LL and Bi, R and Chen, LJ and Deng, DY and Liu, C and Otecko, NO and Tang, Y and Lai, X and Zhang, L and Wei, J}, title = {Correlations between mitochondrial DNA haplogroup D5 and chronic hepatitis B virus infection in Yunnan, China.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {869}, pmid = {29343698}, issn = {2045-2322}, mesh = {Adult ; Biomarkers ; Case-Control Studies ; China ; *DNA, Mitochondrial ; Female ; *Haplotypes ; *Hepatitis B virus ; Hepatitis B, Chronic/*genetics/metabolism/*virology ; Humans ; Liver Function Tests ; Male ; Middle Aged ; Odds Ratio ; Viral Load ; }, abstract = {Mitochondrial abnormality is frequently reported in individuals with hepatitis B virus (HBV) infection, but the associated hosts' mitochondrial genetic factors remain obscure. We hypothesized that mitochondria may affect host susceptibility to HBV infection. In this study, we aimed to detect the association between chronic HBV infection and mitochondrial DNA in Chinese from Yunnan, Southwest China. A total of 272 individuals with chronic HBV infection (CHB), 310 who had never been infected by HBV (healthy controls, HC) and 278 with a trace of HBV infection (spontaneously recovered, SR) were analysed for mtDNA sequence variations and classified into respective haplogroups. Haplogroup frequencies were compared between HBV infected patients, HCs and SRs. Haplogroup D5 presented a higher frequency in CHBs than in HCs (P = 0.017, OR = 2.87, 95% confidence interval [CI] = (1.21-6.81)) and SRs (P = 0.049, OR = 2.90, 95% CI = 1.01-8.35). The network of haplogroup D5 revealed a distinct distribution pattern between CHBs and non-CHBs. A trend of higher viral load among CHBs with haplogroup D5 was observed. Our results indicate the risk potential of mtDNA haplogroup D5 in chronic HBV infection in Yunnan, China.}, }
@article {pmid29343499, year = {2018}, author = {Wilton, PR and Zaidi, A and Makova, K and Nielsen, R}, title = {A Population Phylogenetic View of Mitochondrial Heteroplasmy.}, journal = {Genetics}, volume = {208}, number = {3}, pages = {1261-1274}, pmid = {29343499}, issn = {1943-2631}, support = {R01 GM116044/GM/NIGMS NIH HHS/United States ; }, mesh = {Algorithms ; Bayes Theorem ; Computer Simulation ; *Genetics, Population ; Mitochondria/*genetics ; *Models, Genetic ; *Phylogeny ; }, abstract = {The mitochondrion has recently emerged as an active player in myriad cellular processes. Additionally, it was recently shown that >200 diseases are known to be linked to variants in mitochondrial DNA or in nuclear genes interacting with mitochondria. This has reinvigorated interest in its biology and population genetics. Mitochondrial heteroplasmy, or genotypic variation of mitochondria within an individual, is now understood to be common in humans and important in human health. However, it is still not possible to make quantitative predictions about the inheritance of heteroplasmy and its proliferation within the body, partly due to the lack of an appropriate model. Here, we present a population-genetic framework for modeling mitochondrial heteroplasmy as a process that occurs on an ontogenetic phylogeny, with genetic drift and mutation changing heteroplasmy frequencies during the various developmental processes represented in the phylogeny. Using this framework, we develop a Bayesian inference method for inferring rates of mitochondrial genetic drift and mutation at different stages of human life. Applying the method to previously published heteroplasmy frequency data, we demonstrate a severe effective germline bottleneck comprised of the cumulative genetic drift occurring between the divergence of germline and somatic cells in the mother, and the separation of germ layers in the offspring. Additionally, we find that the two somatic tissues we analyze here undergo tissue-specific bottlenecks during embryogenesis, less severe than the effective germline bottleneck, and that these somatic tissues experience little additional genetic drift during adulthood. We conclude with a discussion of possible extensions of the ontogenetic phylogeny framework and its possible applications to other ontogenetic processes in addition to mitochondrial heteroplasmy.}, }
@article {pmid29339819, year = {2018}, author = {Sharma, I and Sharma, V and Khan, A and Kumar, P and Rai, E and Bamezai, RNK and Vilar, M and Sharma, S}, title = {Ancient Human Migrations to and through Jammu Kashmir- India were not of Males Exclusively.}, journal = {Scientific reports}, volume = {8}, number = {1}, pages = {851}, pmid = {29339819}, issn = {2045-2322}, mesh = {DNA, Mitochondrial/chemistry/classification/metabolism ; Female ; Genetic Variation ; Haplotypes ; *Human Migration ; Humans ; India ; Male ; Mitochondria/genetics ; Phylogeny ; }, abstract = {Jammu and Kashmir (J&amp;K), the Northern most State of India, has been under-represented or altogether absent in most of the phylogenetic studies carried out in literature, despite its strategic location in the Himalayan region. Nonetheless, this region may have acted as a corridor to various migrations to and from mainland India, Eurasia or northeast Asia. The belief goes that most of the migrations post-late-Pleistocene were mainly male dominated, primarily associated with population invasions, where female migration may thus have been limited. To evaluate female-centered migration patterns in the region, we sequenced 83 complete mitochondrial genomes of unrelated individuals belonging to different ethnic groups from the state. We observed a high diversity in the studied maternal lineages, identifying 19 new maternal sub-haplogroups (HGs). High maternal diversity and our phylogenetic analyses suggest that the migrations post-Pleistocene were not strictly paternal, as described in the literature. These preliminary observations highlight the need to carry out an extensive study of the endogamous populations of the region to unravel many facts and find links in the peopling of India.}, }
@article {pmid29338715, year = {2018}, author = {Ramos, B and González-Acuña, D and Loyola, DE and Johnson, WE and Parker, PG and Massaro, M and Dantas, GPM and Miranda, MD and Vianna, JA}, title = {Landscape genomics: natural selection drives the evolution of mitogenome in penguins.}, journal = {BMC genomics}, volume = {19}, number = {1}, pages = {53}, pmid = {29338715}, issn = {1471-2164}, support = {11110060 and 1150517//Fondo Nacional de Desarrollo Científico y Tecnológico (CL)/International ; INACH T12-13//Instituto Antártico Chileno/International ; DI-410-13/I//Universidad Andres Bello/International ; 482501/2013-8 and 490403/2008-5//Conselho Nacional de Desenvolvimento Científico e Tecnológico (BR)/International ; 2009/08624//Fundação de Amparo à Pesquisa do Estado de São Paulo/International ; ANT 0944411//Directorate for Biological Sciences/International ; C01X1001//Ministry of Science and Innovation, New Zealand/International ; }, mesh = {Animals ; DNA, Mitochondrial/chemistry ; *Evolution, Molecular ; Gene-Environment Interaction ; *Genome, Mitochondrial ; Genomics ; *Selection, Genetic ; Spheniscidae/*genetics ; }, abstract = {BACKGROUND: Mitochondria play a key role in the balance of energy and heat production, and therefore the mitochondrial genome is under natural selection by environmental temperature and food availability, since starvation can generate more efficient coupling of energy production. However, selection over mitochondrial DNA (mtDNA) genes has usually been evaluated at the population level. We sequenced by NGS 12 mitogenomes and with four published genomes, assessed genetic variation in ten penguin species distributed from the equator to Antarctica. Signatures of selection of 13 mitochondrial protein-coding genes were evaluated by comparing among species within and among genera (Spheniscus, Pygoscelis, Eudyptula, Eudyptes and Aptenodytes). The genetic data were correlated with environmental data obtained through remote sensing (sea surface temperature [SST], chlorophyll levels [Chl] and a combination of SST and Chl [COM]) through the distribution of these species.<br><br>RESULTS: We identified the complete mtDNA genomes of several penguin species, including ND6 and 8 tRNAs on the light strand and 12 protein coding genes, 14 tRNAs and two rRNAs positioned on the heavy strand. The highest diversity was found in NADH dehydrogenase genes and the lowest in COX genes. The lowest evolutionary divergence among species was between Humboldt (Spheniscus humboldti) and Galapagos (S. mendiculus) penguins (0.004), while the highest was observed between little penguin (Eudyptula minor) and Adélie penguin (Pygoscelis adeliae) (0.097). We identified a signature of purifying selection (Ka/Ks < 1) across the mitochondrial genome, which is consistent with the hypothesis that purifying selection is constraining mitogenome evolution to maintain Oxidative phosphorylation (OXPHOS) proteins and functionality. Pairwise species maximum-likelihood analyses of selection at codon sites suggest positive selection has occurred on ATP8 (Fixed-Effects Likelihood, FEL) and ND4 (Single Likelihood Ancestral Counting, SLAC) in all penguins. In contrast, COX1 had a signature of strong negative selection. ND4 Ka/Ks ratios were highly correlated with SST (Mantel, p-value: 0.0001; GLM, p-value: 0.00001) and thus may be related to climate adaptation throughout penguin speciation.<br><br>CONCLUSIONS: These results identify mtDNA candidate genes under selection which could be involved in broad-scale adaptations of penguins to their environment. Such knowledge may be particularly useful for developing predictive models of how these species may respond to severe climatic changes in the future.}, }
@article {pmid29337274, year = {2018}, author = {Ballesteros, JA and Hormiga, G}, title = {Species delimitation of the North American orchard-spider Leucauge venusta (Walckenaer, 1841) (Araneae, Tetragnathidae).}, journal = {Molecular phylogenetics and evolution}, volume = {121}, number = {}, pages = {183-197}, doi = {10.1016/j.ympev.2018.01.002}, pmid = {29337274}, issn = {1095-9513}, mesh = {Animals ; Brazil ; Calibration ; Canada ; Ecosystem ; Florida ; Geography ; Male ; Mexico ; Mitochondria/genetics ; North America ; *Phylogeny ; Probability ; Species Specificity ; Spiders/classification/*genetics ; Time Factors ; United States ; }, abstract = {The orchard spider, Leucauge venusta (Walckenaer, 1841) is one of the most common and abundant orb-weavers in North America. This species has a broad geographic distribution extending across tropical and temperate regions of the Americas from Canada to Brazil. Guided by a preliminary observation of the barcode gap between sequences from specimens of L. venusta collected in Florida and other North American localities, we collected across a transect through the southeastern USA to investigate the observed genetic divide. The dataset, complemented with additional samples from Mexico, and Brazil was analyzed for species delimitation using STACEY and bGMYC based on sequences from one nuclear (ITS2) and one mitochondrial marker (COI). The analyses clearly separate USA samples into two deeply divergent and geographically structured groups (north-south) which we interpret as two different species. We generated ecological niche models for these two groups rejecting a niche equivalence hypothesis for these lineages. Taxonomic changes are proposed based on these findings, Leucauge venusta is restricted to denote the northern clade, and its known distribution restricted to the USA. Leucauge argyrobapta (White, 1841) is removed from synonymy to denote the populations in Florida, Mexico and Brazil. Although the delimitation analyses suggest each of these geographic clusters within the L. argyrobapta samples represent different species, more specimens from Central and South America are needed to properly test the cohesion of L. argyrobapta populations.}, }
@article {pmid29335382, year = {2018}, author = {Aviv, A}, title = {The mitochondrial genome, paternal age and telomere length in humans.}, journal = {Philosophical transactions of the Royal Society of London. Series B, Biological sciences}, volume = {373}, number = {1741}, pages = {}, pmid = {29335382}, issn = {1471-2970}, support = {R01 HL116446/HL/NHLBI NIH HHS/United States ; R01 HD071180/HD/NICHD NIH HHS/United States ; R01 HL134840/HL/NHLBI NIH HHS/United States ; }, mesh = {Biological Evolution ; *Genome, Mitochondrial ; Humans ; Male ; *Paternal Age ; Polymorphism, Genetic ; Reactive Oxygen Species/metabolism ; Spermatozoa/metabolism ; Stem Cells ; Telomere/*metabolism ; *Telomere Homeostasis ; }, abstract = {Telomere length (TL) in humans is highly heritable and undergoes progressive age-dependent shortening in somatic cells. By contrast, sperm donated by older men display comparatively long telomeres, presumably because in the male germline, telomeres become longer with age. This puzzling phenomenon might explain why TL in the offspring correlates positively with paternal age. The present communication proposes that mitochondrial DNA polymorphisms and heteroplasmy cause variation in the production of reactive oxygen species, which, in turn, mediate age-dependent selection of germ stem cells with long telomeres and hence sperm with long telomeres. These long telomeres are then inherited by the offspring. The effect of paternal age on the offspring TL might be an evolutionarily driven mechanism that helps regulate TL across the human population.This article is part of the theme issue 'Understanding diversity in telomere dynamics'.}, }
@article {pmid29334409, year = {2018}, author = {Lamb, AM and Gan, HM and Greening, C and Joseph, L and Lee, YP and Morán-Ordóñez, A and Sunnucks, P and Pavlova, A}, title = {Climate-driven mitochondrial selection: A test in Australian songbirds.}, journal = {Molecular ecology}, volume = {27}, number = {4}, pages = {898-918}, doi = {10.1111/mec.14488}, pmid = {29334409}, issn = {1365-294X}, mesh = {Amino Acids/genetics ; Animals ; Australia ; Bayes Theorem ; *Climate ; Codon/genetics ; Genes, Mitochondrial ; Mitochondria/*genetics ; NADH Dehydrogenase ; Open Reading Frames/genetics ; Phylogeny ; Phylogeography ; *Selection, Genetic ; Songbirds/*genetics ; Species Specificity ; Structural Homology, Protein ; }, abstract = {Diversifying selection between populations that inhabit different environments can promote lineage divergence within species and ultimately drive speciation. The mitochondrial genome (mitogenome) encodes essential proteins of the oxidative phosphorylation (OXPHOS) system and can be a strong target for climate-driven selection (i.e., associated with inhabiting different climates). We investigated whether Pleistocene climate changes drove mitochondrial selection and evolution within Australian birds. First, using phylogeographic analyses of the mitochondrial ND2 gene for 17 songbird species, we identified mitochondrial clades (mitolineages). Second, using distance-based redundancy analyses, we tested whether climate predicts variation in intraspecific genetic divergence beyond that explained by geographic distances and geographic position. Third, we analysed 41 complete mitogenome sequences representing each mitolineage of 17 species using codon models in a phylogenetic framework and a biochemical approach to identify signals of selection on OXPHOS protein-coding genes and test for parallel selection in mitolineages of different species existing in similar climates. Of 17 species examined, 13 had multiple mitolineages (range: 2-6). Climate was a significant predictor of mitochondrial variation in eight species. At least two amino acid replacements in OXPHOS complex I could have evolved under positive selection in specific mitolineages of two species. Protein homology modelling showed one of these to be in the loop region of the ND6 protein channel and the other in the functionally critical helix HL region of ND5. These findings call for direct tests of the functional and evolutionary significance of mitochondrial protein candidates for climate-associated selection.}, }
@article {pmid29312883, year = {2017}, author = {Lemasters, JJ}, title = {Evolution of Voltage-Dependent Anion Channel Function: From Molecular Sieve to Governator to Actuator of Ferroptosis.}, journal = {Frontiers in oncology}, volume = {7}, number = {}, pages = {303}, pmid = {29312883}, issn = {2234-943X}, support = {R01 AA021191/AA/NIAAA NIH HHS/United States ; P30 CA138313/CA/NCI NIH HHS/United States ; P20 GM103542/GM/NIGMS NIH HHS/United States ; R01 DK073336/DK/NIDDK NIH HHS/United States ; R01 CA184456/CA/NCI NIH HHS/United States ; R01 DE016572/DE/NIDCR NIH HHS/United States ; }, abstract = {The voltage-dependent anion channel (VDAC) is well known as the pathway for passive diffusion of anionic hydrophilic mitochondrial metabolites across the outer membrane, but a more complex functionality of the three isoforms of VDAC has emerged, as addressed in the Frontiers in Oncology Research Topic on &quot;Uncovering the Function of the Mitochondrial Protein VDAC in Health and Disease: from Structure-Function to Novel Therapeutic Strategies.&quot; VDAC as the single most abundant protein in mitochondrial outer membranes is typically involved in isoform-specific interactions of the mitochondrion with its surroundings as, for example, during mitochondria-dependent pathways of cell death. VDAC closure can also act as an adjustable limiter (governator) of global mitochondrial metabolism, as during hepatic ethanol metabolism to promote selective oxidation of membrane-permeant acetaldehyde. In cancer cells, high free tubulin inhibits VDAC1 and VDAC2, contributing to suppression of mitochondrial function in the Warburg phenomenon. Erastin, the canonical inducer of ferroptosis, opens VDAC in the presence of tubulin and hyperpolarizes mitochondria, leading to mitochondrial production of reactive oxygen species, mitochondrial dysfunction, and cell death. Our understanding of VDAC function continues to evolve.}, }
@article {pmid29307851, year = {2018}, author = {Bai, J and Xu, S and Nie, Z and Wang, Y and Zhu, C and Wang, Y and Min, W and Cai, Y and Zou, J and Zhou, X}, title = {The complete mitochondrial genome of Huananpotamon lichuanense (Decapoda: Brachyura) with phylogenetic implications for freshwater crabs.}, journal = {Gene}, volume = {646}, number = {}, pages = {217-226}, doi = {10.1016/j.gene.2018.01.015}, pmid = {29307851}, issn = {1879-0038}, mesh = {Animals ; Brachyura/*genetics ; Evolution, Molecular ; Gene Order ; Genome Size ; *Genome, Mitochondrial ; Male ; Mitochondria/*genetics ; Phylogeny ; RNA, Transfer/genetics ; Selection, Genetic ; Sequence Analysis, DNA/*methods ; }, abstract = {In the present study, we determined the complete mitochondrial genome of Huananpotamon lichuanense (Decapoda: Brachyura) for the first time. The genome is 15,380bp in length and typically consists of 37 genes. When the gene order was compared to the ancestral crustacean type, two tRNA genes (tRNAHis and tRNAGln) were rearranged in H. lichuanense, and the translocation of tRNAGln appeared only in Potamoidea crabs, such as Geothelphusa dehaani and Sinopotamon xiushuiense, supporting the monophyly of the Potamoidea superfamily. Thirteen protein-coding genes and 2 rRNA genes were divided into five complexes to perform the phylogenetic analysis, and the results showed that the trees constructed by complex I (ND1-ND6 and ND4L), complex IV (COX1-COX3) and rRNA genes better accord with the morphological classification system, suggesting that molecular markers of higher-level phylogeny can be developed in these three complexes in the future. The estimated divergence time for freshwater crabs is approximately 133.58Ma, and G. dehaani from Japan diverged from the freshwater crabs of mainland China approximately 60.66Ma. A selective pressure analysis based on current data revealed obviously increasing dN/dS ratios (except for ATP6 and ND4L) of freshwater crabs, and the accumulation of nonsynonymous mutations suggests that terrestrial habitats provide a relatively relaxed selective pressure environment for this group.}, }
@article {pmid29301905, year = {2018}, author = {Dai, D and Luan, S and Chen, X and Wang, Q and Feng, Y and Zhu, C and Qi, W and Song, R}, title = {Maize Dek37 Encodes a P-type PPR Protein That Affects cis-Splicing of Mitochondrial nad2 Intron 1 and Seed Development.}, journal = {Genetics}, volume = {208}, number = {3}, pages = {1069-1082}, pmid = {29301905}, issn = {1943-2631}, mesh = {Cloning, Molecular ; *Gene Expression Regulation, Plant ; *Introns ; Mitochondria/genetics ; Mitochondrial Proteins/*genetics ; Mutation ; NADH Dehydrogenase/metabolism ; Phenotype ; Phylogeny ; Plant Proteins/*genetics ; Protein Transport ; *RNA Splicing ; Seeds/*genetics ; Zea mays/*genetics ; }, abstract = {Mitochondrial group II introns require the participation of numerous nucleus-encoded general and specific factors to achieve efficient splicing in vivo Pentatricopeptide repeat (PPR) proteins have been implicated in assisting group II intron splicing. Here, we identified and characterized a new maize seed mutant, defective kernel 37 (dek37), which has significantly delayed endosperm and embryo development. Dek37 encodes a classic P-type PPR protein that targets mitochondria. The dek37 mutation causes no detectable DEK37 protein in mutant seeds. Mitochondrial transcripts analysis indicated that dek37 mutation decreases splicing efficiency of mitochondrial nad2 intron 1, leading to reduced assembly and NADH dehydrogenase activity of complex I. Transmission Electron Microscopy (TEM) revealed severe morphological defects of mitochondria in dek37 Transcriptome analysis of dek37 endosperm indicated enhanced expression in the alternative respiratory pathway and extensive differentially expressed genes related to mitochondrial function. These results indicated that Dek37 is involved in cis-splicing of mitochondrial nad2 intron 1 and is required for complex I assembly, mitochondrial function, and seed development in maize.}, }
@article {pmid29299440, year = {2017}, author = {Awadi, A}, title = {Host species and pathogenicity effects in the evolution of the mitochondrial genomes of Eimeria species (Apicomplexa; Coccidia; Eimeriidae).}, journal = {Journal of biological research (Thessalonike, Greece)}, volume = {24}, number = {}, pages = {13}, pmid = {29299440}, issn = {1790-045X}, abstract = {Background: Mitochondria are fundamental organelles responsible for cellular metabolism and energy production in eukaryotes via the oxidative phosphorylation pathway. Mitochondrial DNA is often used in population and species studies with the assumption of neutral evolution. However, evidence of positive selection in mitochondrial coding genes of various animal species has accumulated suggesting that amino acid changes in mtDNA might be adaptive. The functional and physiological implications of the inferred positively selected sites are usually unknown and are only evaluated based on available structural and functional models. Such studies are absent in unicellular organisms that show several crucial differences to the electron transport chain of animal mitochondria. In the present study, we explored Eimeria mitogenomes for positive selection. We also tested for association between mtDNA polymorphism and environmental variation (i.e. host species), parasite life cycle (i.e. sporulation period), and efficient host cell invasion (i.e. pathogenicity, prepatent period).<br><br>Findings: We used site- and branch-site tests to estimate the extent of purifying and positive selection at each site and each lineage of several Eimeria parasite mitogenomes retrieved from GenBank. We founded sixteen codons in the three mtDNA-encoded proteins to be under positive selection compared to a strong purifying selection. Variation in the ratios of non-synonymous to synonymous changes of the studied parasites was associated with their different host species (F = 13.748; p < 0.001), whereas pathogenicity levels were associated with both synonymous and non-synonymous changes. This association was also confirmed by the multiple regression analysis.<br><br>Conclusions: Our results suggest that host species and pathogenicity are important factors that might shape mitochondrial variation in Eimeria parasites. This supports the important role of mtDNA variations in the evolution and adaptation of these parasites.}, }
@article {pmid29297348, year = {2017}, author = {Logacheva, MD and Krinitsina, AA and Belenikin, MS and Khafizov, K and Konorov, EA and Kuptsov, SV and Speranskaya, AS}, title = {Comparative analysis of inverted repeats of polypod fern (Polypodiales) plastomes reveals two hypervariable regions.}, journal = {BMC plant biology}, volume = {17}, number = {Suppl 2}, pages = {255}, pmid = {29297348}, issn = {1471-2229}, mesh = {DNA, Plant/genetics ; Genes, Plant/genetics ; Genome, Plant/genetics ; Inverted Repeat Sequences/*genetics ; Phylogeny ; Plastids/*genetics ; Tracheophyta/*genetics ; }, abstract = {BACKGROUND: Ferns are large and underexplored group of vascular plants (~ 11 thousands species). The genomic data available by now include low coverage nuclear genomes sequences and partial sequences of mitochondrial genomes for six species and several plastid genomes.<br><br>RESULTS: We characterized plastid genomes of three species of Dryopteris, which is one of the largest fern genera, using sequencing of chloroplast DNA enriched samples and performed comparative analysis with available plastomes of Polypodiales, the most species-rich group of ferns. We also sequenced the plastome of Adianthum hispidulum (Pteridaceae). Unexpectedly, we found high variability in the IR region, including duplication of rrn16 in D. blanfordii, complete loss of trnI-GAU in D. filix-mas, its pseudogenization due to the loss of an exon in D. blanfordii. Analysis of previously reported plastomes of Polypodiales demonstrated that Woodwardia unigemmata and Lepisorus clathratus have unusual insertions in the IR region. The sequence of these inserted regions has high similarity to several LSC fragments of ferns outside of Polypodiales and to spacer between tRNA-CGA and tRNA-TTT genes of mitochondrial genome of Asplenium nidus. We suggest that this reflects the ancient DNA transfer from mitochondrial to plastid genome occurred in a common ancestor of ferns. We determined the marked conservation of gene content and relative evolution rate of genes and intergenic spacers in the IRs of Polypodiales. Faster evolution of the four intergenic regions had been demonstrated (trnA- orf42, rrn16-rps12, rps7-psbA and ycf2-trnN).<br><br>CONCLUSIONS: IRs of Polypodiales plastomes are dynamic, driven by such events as gene loss, duplication and putative lateral transfer from mitochondria.}, }
@article {pmid29294404, year = {2018}, author = {Qu, M and Tang, W and Liu, Q and Wang, D and Ding, S}, title = {Genetic diversity within grouper species and a method for interspecific hybrid identification using DNA barcoding and RYR3 marker.}, journal = {Molecular phylogenetics and evolution}, volume = {121}, number = {}, pages = {46-51}, doi = {10.1016/j.ympev.2017.12.031}, pmid = {29294404}, issn = {1095-9513}, mesh = {Animals ; Biomarkers/*metabolism ; Cell Nucleus/genetics ; China ; DNA Barcoding, Taxonomic/*methods ; Electron Transport Complex IV/genetics ; Fishes/*genetics ; *Genetic Variation ; Geography ; *Hybridization, Genetic ; Mitochondria/genetics ; Oceans and Seas ; Phylogeny ; Ryanodine Receptor Calcium Release Channel/*genetics ; Species Specificity ; }, abstract = {Groupers (family Epinephelidae) are an assemblage of coral reef fishes comprising more than 160 species in 16 genera, many of which are both environmentally and economically valuable. Because of their similar morphology, variable color patterns, and tendency for interspecies hybridization, morphological identification of groupers usually leads to taxonomic confusion. To find an effective method for identifying different grouper species and hybrids, evaluate genetic diversity and uncover any synonymous or cryptic species, we sampled a total of 221 specimens representing 57 species in 9 genera in the China Seas. Both mitochondrial (mt) cytochrome oxidase subunit I (COI) and NADH dehydrogenase subunit 2 (ND2) were found to be effective barcoding genes. We also developed an efficient protocol for identifying hybrid groupers using mt markers and the nuclear RYR3 gene and found the first record of wide interspecies hybridization in genus Epinephelus. This barcoding study revealed high genetic divergence in many widespread species and possible synonyms. In addition to providing a molecular method for identifying grouper species, this study offers important resources for the further study of grouper conservation genetics, speciation, hybridization and other evolutionary traits.}, }
@article {pmid29293597, year = {2018}, author = {Silva, SR and Michael, TP and Meer, EJ and Pinheiro, DG and Varani, AM and Miranda, VFO}, title = {Comparative genomic analysis of Genlisea (corkscrew plants-Lentibulariaceae) chloroplast genomes reveals an increasing loss of the ndh genes.}, journal = {PloS one}, volume = {13}, number = {1}, pages = {e0190321}, pmid = {29293597}, issn = {1932-6203}, mesh = {Chloroplasts/*genetics ; *Genome, Chloroplast ; Magnoliopsida/classification/*genetics ; NADPH Dehydrogenase/*genetics ; Phylogeny ; }, abstract = {In the carnivorous plant family Lentibulariaceae, all three genome compartments (nuclear, chloroplast, and mitochondria) have some of the highest rates of nucleotide substitutions across angiosperms. While the genera Genlisea and Utricularia have the smallest known flowering plant nuclear genomes, the chloroplast genomes (cpDNA) are mostly structurally conserved except for deletion and/or pseudogenization of the NAD(P)H-dehydrogenase complex (ndh) genes known to be involved in stress conditions of low light or CO2 concentrations. In order to determine how the cpDNA are changing, and to better understand the evolutionary history within the Genlisea genus, we sequenced, assembled and analyzed complete cpDNA from six species (G. aurea, G. filiformis, G. pygmaea, G. repens, G. tuberosa and G. violacea) together with the publicly available G. margaretae cpDNA. In general, the cpDNA structure among the analyzed Genlisea species is highly similar. However, we found that the plastidial ndh genes underwent a progressive process of degradation similar to the other terrestrial Lentibulariaceae cpDNA analyzed to date, but in contrast to the aquatic species. Contrary to current thinking that the terrestrial environment is a more stressful environment and thus requiring the ndh genes, we provide evidence that in the Lentibulariaceae the terrestrial forms have progressive loss while the aquatic forms have the eleven plastidial ndh genes intact. Therefore, the Lentibulariaceae system provides an important opportunity to understand the evolutionary forces that govern the transition to an aquatic environment and may provide insight into how plants manage water stress at a genome scale.}, }
@article {pmid29284403, year = {2017}, author = {Wojtkowska, M and Buczek, D and Suzuki, Y and Shabardina, V and Makałowski, W and Kmita, H}, title = {The emerging picture of the mitochondrial protein import complexes of Amoebozoa supergroup.}, journal = {BMC genomics}, volume = {18}, number = {1}, pages = {997}, pmid = {29284403}, issn = {1471-2164}, support = {MPD/2010/3//Fundacja na rzecz Nauki Polskiej/International ; 01/KNOW2/2014//Polish Ministry of Science and Higher Education/International ; }, mesh = {Acanthamoeba castellanii/genetics ; Amoebozoa/classification/*genetics ; Cells, Cultured ; Dictyostelium/genetics ; Gene Expression Profiling ; Genomics ; Mitochondrial Membrane Transport Proteins/classification/*genetics ; Phylogeny ; Protein Subunits/genetics ; }, abstract = {BACKGROUND: The existence of mitochondria-related organelles (MROs) is proposed for eukaryotic organisms. The Amoebozoa includes some organisms that are known to have mitosomes but also organisms that have aerobic mitochondria. However, the mitochondrial protein apparatus of this supergroup remains largely unsampled, except for the mitochondrial outer membrane import complexes studied recently. Therefore, in this study we investigated the mitochondrial inner membrane and intermembrane space complexes, using the available genome and transcriptome sequences.<br><br>RESULTS: When compared with the canonical cognate complexes described for the yeast Saccharomyces cerevisiae, amoebozoans with aerobic mitochondria, display lower differences in the number of subunits predicted for these complexes than the mitochondrial outer membrane complexes, although the predicted subunits appear to display different levels of diversity in regard to phylogenetic position and isoform numbers. For the putative mitosome-bearing amoebozoans, the number of predicted subunits suggests the complex elimination distinctly more pronounced than in the case of the outer membrane ones.<br><br>CONCLUSION: The results concern the problem of mitochondrial and mitosome protein import machinery structural variability and the reduction of their complexity within the currently defined supergroup of Amoebozoa. This results are crucial for better understanding of the Amoebozoa taxa of both biomedical and evolutionary importance.}, }
@article {pmid29281973, year = {2017}, author = {Chong, RA and Mueller, RL}, title = {Polymorphic duplicate genes and persistent non-coding sequences reveal heterogeneous patterns of mitochondrial DNA loss in salamanders.}, journal = {BMC genomics}, volume = {18}, number = {1}, pages = {992}, pmid = {29281973}, issn = {1471-2164}, support = {1210900//Division of Environmental Biology/International ; 1021489//Division of Environmental Biology/International ; }, mesh = {Animals ; Cell Nucleus/genetics ; DNA, Intergenic/chemistry ; DNA, Mitochondrial/*chemistry ; *Evolution, Molecular ; Gene Duplication ; *Gene Order ; *Genes, Duplicate ; *Genes, Mitochondrial ; Genes, rRNA ; Genetic Variation ; Mitochondrial Proteins/genetics ; Phylogeny ; RNA, Transfer/genetics ; Urodela/classification/*genetics ; }, abstract = {BACKGROUND: Mitochondria are the site of the citric acid cycle and oxidative phosphorylation (OXPHOS). In metazoans, the mitochondrial genome is a small, circular molecule averaging 16.5 kb in length. Despite evolutionarily conserved gene content, metazoan mitochondrial genomes show a diversity of gene orders most commonly explained by the duplication-random loss (DRL) model. In the DRL model, (1) a sequence of genes is duplicated in tandem, (2) one paralog sustains a loss-of-function mutation, resulting in selection to retain the other copy, and (3) the non-functional paralog is eventually deleted from the genome. Despite its apparent role in generating mitochondrial gene order diversity, little is known about the tempo and mode of random gene loss after duplication events. Here, we determine mitochondrial gene order across the salamander genus Aneides, which was previously shown to include at least two DRL-mediated rearrangement events. We then analyze these gene orders in a phylogenetic context to reveal patterns of DNA loss after mitochondrial gene duplication.<br><br>RESULTS: We identified two separate duplication events that resulted in mitochondrial gene rearrangements in Aneides; one occurred at the base of the clade tens of millions of years ago, while the other occurred much more recently (i.e. within a single species), resulting in gene order polymorphism and paralogs that are readily identifiable. We demonstrate that near-complete removal of duplicate rRNA genes has occurred since the recent duplication event, whereas duplicate protein-coding genes persist as pseudogenes and duplicate tRNAs persist as functionally intact paralogs. In addition, we show that non-coding DNA duplicated at the base of the clade has persisted across species for tens of millions of years.<br><br>CONCLUSIONS: The evolutionary history of the mitochondrial genome, from its inception as a bacterial endosymbiont, includes massive genomic reduction. Consistent with this overall trend, selection for efficiency of mitochondrial replication and transcription has been hypothesized to favor elimination of extra sequence. Our results, however, suggest that there may be no strong disadvantage to extraneous sequences in salamander mitochondrial genomes, although duplicate rRNA genes may be deleterious.}, }
@article {pmid29280079, year = {2018}, author = {de Brito Vieira, WH and Ferraresi, C and Schwantes, MLB and de Andrade Perez, SE and Baldissera, V and Cerqueira, MS and Parizotto, NA}, title = {Photobiomodulation increases mitochondrial citrate synthase activity in rats submitted to aerobic training.}, journal = {Lasers in medical science}, volume = {33}, number = {4}, pages = {803-810}, pmid = {29280079}, issn = {1435-604X}, mesh = {Animals ; Citrate (si)-Synthase/*metabolism ; Infrared Rays ; L-Lactate Dehydrogenase/metabolism ; Low-Level Light Therapy ; Male ; Mitochondria, Muscle/*enzymology/radiation effects ; Muscle, Skeletal/enzymology/radiation effects ; Myocardium/enzymology ; Physical Conditioning, Animal ; Rats ; Rats, Wistar ; Running ; }, abstract = {This study investigated the effects of photobiomodulation by low-laser laser therapy (LLLT) on the activities of citrate synthase (CS) and lactate dehydrogenase (LDH) and the anaerobic threshold (AT) in rats submitted to treadmill exercise. Fifty-four rats were allocated into four groups: rest control (RCG), rest laser (RLG), exercise control (ECG), and exercise laser (ELG). The infrared LLLT was applied daily on the quadriceps, gluteus maximum, soleus, and tibialis anterior muscles. Muscle samples (soleus, tibialis anterior, and cardiac muscles) were removed 48 h after the last exercise session for spectrophotometric analysis of the CS and LDH. The CS activity (μmol/protein) in ELG (16.02 and 0.49) was significantly greater (P < 0.05) than RCG (2.34 and 0.24), RLG (6.25 and 0.17), and ECG (6.76 and 0.26) in the cardiac and soleus muscles, respectively. The LDH activity (in 1 Mm/protein) in soleus muscle was smaller (P < 0.05) for ELG (0.33) compared to ECG (0.97), RLG (0.79), and RCG (1.07). For cardiac muscle, the LDH activity was smaller (P < 0.05) in ELG (1.38) compared to ECG (1.91) and RCG (2.55). The ECG and ELG showed increases in the maximum speed and a shift of the AT to higher effort levels after the training period, but no differences occurred between the exercised groups. In conclusion, the aerobic treadmill training combined with LLLT promotes an increase of oxidative capacity in this rat model, mainly in muscles with greater aerobic capacity.}, }
@article {pmid29279407, year = {2018}, author = {Łukasik, P and Nazario, K and Van Leuven, JT and Campbell, MA and Meyer, M and Michalik, A and Pessacq, P and Simon, C and Veloso, C and McCutcheon, JP}, title = {Multiple origins of interdependent endosymbiotic complexes in a genus of cicadas.}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {115}, number = {2}, pages = {E226-E235}, pmid = {29279407}, issn = {1091-6490}, mesh = {Animals ; Bacteria/*classification/*genetics ; Bacterial Physiological Phenomena/*genetics ; Biological Evolution ; Chile ; Genetic Variation ; Genome, Bacterial ; Hemiptera/*microbiology ; Phylogeny ; Symbiosis/*physiology ; }, abstract = {Bacterial endosymbionts that provide nutrients to hosts often have genomes that are extremely stable in structure and gene content. In contrast, the genome of the endosymbiont Hodgkinia cicadicola has fractured into multiple distinct lineages in some species of the cicada genus Tettigades To better understand the frequency, timing, and outcomes of Hodgkinia lineage splitting throughout this cicada genus, we sampled cicadas over three field seasons in Chile and performed genomics and microscopy on representative samples. We found that a single ancestral Hodgkinia lineage has split at least six independent times in Tettigades over the last 4 million years, resulting in complexes of between two and six distinct Hodgkinia lineages per host. Individual genomes in these symbiotic complexes differ dramatically in relative abundance, genome size, organization, and gene content. Each Hodgkinia lineage retains a small set of core genes involved in genetic information processing, but the high level of gene loss experienced by all genomes suggests that extensive sharing of gene products among symbiont cells must occur. In total, Hodgkinia complexes that consist of multiple lineages encode nearly complete sets of genes present on the ancestral single lineage and presumably perform the same functions as symbionts that have not undergone splitting. However, differences in the timing of the splits, along with dissimilar gene loss patterns on the resulting genomes, have led to very different outcomes of lineage splitting in extant cicadas.}, }
@article {pmid29277086, year = {2018}, author = {Hagström, E and Andersson, SG}, title = {The challenges of integrating two genomes in one cell.}, journal = {Current opinion in microbiology}, volume = {41}, number = {}, pages = {89-94}, doi = {10.1016/j.mib.2017.12.003}, pmid = {29277086}, issn = {1879-0364}, mesh = {Bacteria/*genetics/metabolism/pathogenicity ; Cell Nucleus/genetics ; *Evolution, Molecular ; *Genome ; Genome, Mitochondrial ; Humans ; Mitochondria/*genetics ; Oxygen/metabolism ; Phylogeny ; Respiration ; Symbiosis/genetics ; }, abstract = {Mutualistic bacteria and mitochondria have small genomes that harbor host-essential genes. A major question is why a distinct bacterial or mitochondrial genome is needed to encode these functions. The dual location of genes demand two sets of information processing systems, coordination of gene expression and elaborate transport systems. A simpler solution would be to harbor all genes in a single genome. Functional gene transfers to the host nuclear genome is uncommon in mutualistic bacteria and lost gene functions are rather rescued by co-symbiotic bacteria. Recent findings suggest that the mitochondrial genome is retained to avoid conflicting signals between protein targeting pathways in the cell. However, if the selective pressure for oxygenic respiration is lost, the mitochondrial genome will start to deteriorate and soon be lost.}, }
@article {pmid29271525, year = {2018}, author = {Corrêa-da-Silva, F and Pereira, JAS and de Aguiar, CF and de Moraes-Vieira, PMM}, title = {Mitoimmunity-when mitochondria dictates macrophage function.}, journal = {Cell biology international}, volume = {42}, number = {6}, pages = {651-655}, doi = {10.1002/cbin.10921}, pmid = {29271525}, issn = {1095-8355}, mesh = {Animals ; Hypoxia-Inducible Factor 1, alpha Subunit/metabolism ; Inflammasomes/metabolism ; Inflammation/metabolism/*pathology ; Macrophages/cytology/*immunology/metabolism ; Mitochondria/*metabolism ; Mitochondrial Dynamics ; NADP/metabolism ; Reactive Oxygen Species/metabolism ; Succinate Dehydrogenase/metabolism ; }, abstract = {In the past decade, several reports have appointed the importance of mitochondria in the immune response. Our understanding of mitochondria evolved from a simple supplier of energy into a platform necessary for immunorregulation. Proinflammatory responses are associated with enhanced glycolytic activity and breakdown of the TCA cycle. Mitochondrial reactive species of oxygen (mROS) are key regulators of classically activated macrophages, with substantial impact in the anti-microbicidal activity and pro-inflammatory cytokine secretion of macrophages. The inflammasome activation in macrophages is dependent on mROS production and mitochondrial regulation and mitochondrial dynamics and functionality direct impact inflammatory responses. Alternative activated macrophage metabolism relies on fatty acid oxidation, and the mechanism responsible for this phenotype is not fully elucidated. Thus, cellular metabolism and mitochondria function is a key immunoregulatory feature of macrophage biology. In this review, we will provide insights into recently reported evidences of mitochondria-related metabolic nodes, which are important for macrophage physiology.}, }
@article {pmid29262786, year = {2017}, author = {Dai, C and Hao, Y and He, Y and Lei, F}, title = {The absence of reproductive isolation between non-sister and deeply diverged mitochondrial lineages of the black-throated tit (Aegithalos concinnus) revealed by a multilocus genetic analysis in a contact zone.}, journal = {BMC evolutionary biology}, volume = {17}, number = {1}, pages = {266}, pmid = {29262786}, issn = {1471-2148}, support = {31401965//National Natural Science Foundation of China/International ; }, mesh = {Animals ; Base Sequence ; DNA, Mitochondrial/genetics ; *Genetic Loci ; Genetic Speciation ; Genetic Variation ; Geography ; Haplotypes/genetics ; Microsatellite Repeats/genetics ; Mitochondria/*genetics ; Passeriformes/*genetics ; *Phylogeny ; Probability ; *Reproductive Isolation ; Sequence Analysis, DNA ; }, abstract = {BACKGROUND: A deep divergence of mitochondrial DNA is common in species delimitated by morphological traits. Several hypotheses can explain such variations, such as cryptic species, introgression, allopatric divergence and ancestral lineage. The black-throated tit harbors several deeply divergent mitochondrial lineages. Two lineages with 5% divergence, but having a high level of gene flow, have been detected in its subspecies, A. C. concinnus and A. c. talifuenses. In this study, we conducted a genetic analysis at a contact zone of these two lineages to identify whether these lineages either reflect a high level of intraspecific variation in mitochondrial loci or represent incipient speciation. Mitochondrial ND2 and 11 microsatellite loci were used to conduct phylogenetic and population structure analyses.<br><br>RESULTS: ND2 haplotypes actually diverged into two groups within subspecies A. c. talifuenses; however, they formed a non-sister relationship when including all available GenBank ND2 sequences. Analyses of microsatellite data indicated no existing population structure and showed a pattern of isolation by distance. Individuals sampled at the contact zone were almost identified as F2 hybrids.<br><br>CONCLUSIONS: Isolation for 2.4 Ma, as suggested by a previous study, appeared to be insufficient to develop robust reproductive barriers. Reproductive barriers were weak, or even absent between the divergent lineages, highlighting that incipient speciation was unlikely to be the case. Considering the results from previous studies, the divergent lineages may be better explained by secondary contact after allopatric isolation because of Pleistocene climate changes, but other hypotheses cannot be definitively ruled out because of the lack of representative samples from the other distribution region and its relatives. Considering that divergence in morphology was hardly observed and the particular split in genetics, the two subspecies might be better merged. The current findings also highlight the likely contribution of male-biased dispersal to male-biased gene flow among mitochondrial lineages; more efforts are needed to illustrate the evolutionary history of the black-throated tit.}, }
@article {pmid29253894, year = {2017}, author = {Wei, W and Gomez-Duran, A and Hudson, G and Chinnery, PF}, title = {Background sequence characteristics influence the occurrence and severity of disease-causing mtDNA mutations.}, journal = {PLoS genetics}, volume = {13}, number = {12}, pages = {e1007126}, pmid = {29253894}, issn = {1553-7404}, support = {MC_UP_1501/2//Medical Research Council/United Kingdom ; }, mesh = {Alleles ; Base Sequence ; DNA, Mitochondrial/*genetics ; Databases, Genetic ; Founder Effect ; Gene Frequency ; Genetic Variation ; Haplotypes ; Humans ; Mitochondria/genetics ; *Mutation ; Optic Atrophy, Hereditary, Leber/*genetics ; Phylogeny ; }, abstract = {Inherited mitochondrial DNA (mtDNA) mutations have emerged as a common cause of human disease, with mutations occurring multiple times in the world population. The clinical presentation of three pathogenic mtDNA mutations is strongly associated with a background mtDNA haplogroup, but it is not clear whether this is limited to a handful of examples or is a more general phenomenon. To address this, we determined the characteristics of 30,506 mtDNA sequences sampled globally. After performing several quality control steps, we ascribed an established pathogenicity score to the major alleles for each sequence. The mean pathogenicity score for known disease-causing mutations was significantly different between mtDNA macro-haplogroups. Several mutations were observed across all haplogroup backgrounds, whereas others were only observed on specific clades. In some instances this reflected a founder effect, but in others, the mutation recurred but only within the same phylogenetic cluster. Sequence diversity estimates showed that disease-causing mutations were more frequent on young sequences, and genomes with two or more disease-causing mutations were more common than expected by chance. These findings implicate the mtDNA background more generally in recurrent mutation events that have been purified through natural selection in older populations. This provides an explanation for the low frequency of mtDNA disease reported in specific ethnic groups.}, }
@article {pmid29250469, year = {2017}, author = {Klink, GV and Golovin, AV and Bazykin, GA}, title = {Substitutions into amino acids that are pathogenic in human mitochondrial proteins are more frequent in lineages closely related to human than in distant lineages.}, journal = {PeerJ}, volume = {5}, number = {}, pages = {e4143}, pmid = {29250469}, issn = {2167-8359}, abstract = {Propensities for different amino acids within a protein site change in the course of evolution, so that an amino acid deleterious in a particular species may be acceptable at the same site in a different species. Here, we study the amino acid-changing variants in human mitochondrial genes, and analyze their occurrence in non-human species. We show that substitutions giving rise to such variants tend to occur in lineages closely related to human more frequently than in more distantly related lineages, indicating that a human variant is more likely to be deleterious in more distant species. Unexpectedly, substitutions giving rise to amino acids that correspond to alleles pathogenic in humans also more frequently occur in more closely related lineages. Therefore, a pathogenic variant still tends to be more acceptable in human mitochondria than a variant that may only be fit after a substantial perturbation of the protein structure.}, }
@article {pmid29249204, year = {2018}, author = {Stentiford, GD and Ross, S and Minardi, D and Feist, SW and Bateman, KS and Gainey, PA and Troman, C and Bass, D}, title = {Evidence for trophic transfer of Inodosporus octospora and Ovipleistophora arlo n. sp. (Microsporidia) between crustacean and fish hosts.}, journal = {Parasitology}, volume = {145}, number = {8}, pages = {1105-1117}, doi = {10.1017/S0031182017002256}, pmid = {29249204}, issn = {1469-8161}, mesh = {Animals ; DNA, Ribosomal ; Fishes/*microbiology ; Microscopy, Electron, Transmission ; Microsporidia/genetics/*isolation &amp; purification/ultrastructure ; Microsporidiosis/transmission/*veterinary ; Muscles/*microbiology ; Oocytes/microbiology ; Palaemonidae/*microbiology ; Phylogeny ; Polymerase Chain Reaction ; Viral Tropism ; }, abstract = {Within aquatic habitats, the hyper-abundant Order Crustacea appear to be the predominant host group for members of the Phylum Microsporidia. The musculature, a common site of infection, provides access to biochemical (carbohydrate-rich) and physiological (mitochondria-rich) conditions conducive to prolific parasite replication and maturation. The significant proportion of body plan devoted to skeletal musculature in Crustacea provides the location for a highly efficient intracellular parasite factory. In this study, we utilize histological, ultrastructural and phylogenetic evidence to describe a previously known (Inodosporus octospora) and novel (Ovipleistophora arlo n. sp.) microsporidian parasites infecting the musculature of the common prawn (Palaemon serratus) from the same site, at the same time of year. Despite similar clinical signs of infection, both parasites are otherwise distinct in terms of pathogenesis, morphology and phylogeny. Based upon partial subunit ribosomal RNA (SSU rDNA) sequence, we show that that I. octospora may be identical to a Kabatana sp. previously described infecting two-spot goby (Gobiusculus flavescens) in Europe, or at least that Inodosporus and Kabatana genera are synonyms. In addition, SSU rDNA sequence for O. arlo places it within a distinct clade containing Ovipleistophora mirandellae and Ovipleistophora ovariae, both infecting the oocytes of freshwater fish in Europe. Taken together, our data provide strong evidence for trophic-transfer between crustacean and fish hosts for two different microsporidians within clade 5 of the phylum. Furthermore, it demonstrates that morphologically and phylogenetically distinct microsporidians can infect the same tissues of the same host species to impart clinical signs which mimic infection with the other.}, }
@article {pmid29247559, year = {2018}, author = {Lee, K and Lee, HY and Back, K}, title = {Rice histone deacetylase 10 and Arabidopsis histone deacetylase 14 genes encode N-acetylserotonin deacetylase, which catalyzes conversion of N-acetylserotonin into serotonin, a reverse reaction for melatonin biosynthesis in plants.}, journal = {Journal of pineal research}, volume = {64}, number = {2}, pages = {}, doi = {10.1111/jpi.12460}, pmid = {29247559}, issn = {1600-079X}, mesh = {Arabidopsis/*metabolism ; Arylalkylamine N-Acetyltransferase/metabolism ; Histone Deacetylases/*metabolism ; Melatonin/*biosynthesis ; Oryza/*metabolism ; Phylogeny ; Plant Proteins/*metabolism ; Serotonin/analogs &amp; derivatives/metabolism ; }, abstract = {In plants, melatonin production is strictly regulated, unlike the production of its precursor, serotonin, which is highly inducible in response to stimuli, such as senescence and pathogen exposure. Exogenous serotonin treatment does not greatly induce the production of N-acetylserotonin (NAS) and melatonin in plants, which suggests the possible existence of one or more regulatory genes in the pathway for the biosynthesis of melatonin from serotonin. In this report, we found that NAS was rapidly and abundantly converted into serotonin in rice seedlings, indicating the presence of an N-acetylserotonin deacetylase (ASDAC). To clone the putative ASDAC gene, we screened 4 genes that were known as histone deacetylase (HDAC) genes, but encoded proteins targeted into chloroplasts or mitochondria rather than nuclei. Of 4 recombinant Escherichia coli strains expressing these genes, one E. coli strain expressing the rice HDAC10 gene was found to be capable of producing serotonin in response to treatment with NAS. The recombinant purified rice HDAC10 (OsHDAC10) protein exhibited ASDAC enzyme activity toward NAS, N-acetyltyramine (NAT), N-acetyltryptamine, and melatonin, with the highest ASDAC activity for NAT. In addition, its Arabidopsis ortholog, AtHDAC14, showed similar ASDAC activity to that of OsHDAC10. Both OsHDAC10 and AtHDAC14 were found to be expressed in chloroplasts. Phylogenetic analysis indicated that ASDAC homologs were present in archaea, but not in cyanobacteria, which differs from the distribution of serotonin N-acetyltransferase (SNAT). This suggests that SNAT and ASDAC may have evolved differently from ancestral eukaryotic cells.}, }
@article {pmid29245571, year = {2017}, author = {Pickersgill, M and Zimkus, BM and Raw, LRG}, title = {A new species of Phrynobatrachus (Anura: Phrynobatrachidae) from the Eastern Arc Mountians of Tanzania.}, journal = {Zootaxa}, volume = {4350}, number = {1}, pages = {151-163}, doi = {10.11646/zootaxa.4350.1.9}, pmid = {29245571}, issn = {1175-5334}, mesh = {Animals ; *Anura ; Male ; Mitochondria ; Phylogeny ; RNA, Ribosomal, 16S ; Tanzania ; }, abstract = {Phrynobatrachus discogularis sp. nov. (Anura, Phrynobatrachidae) is described from the Eastern Arc Mountains in Tanzania. It occupies upland grasslands and while it morphologically most resembles West and Central African P. gutturosus (Chabanaud, 1921), P. rungwensis (Loveridge, 1932), and P. anotis Schmidt and Inger, 1959, preliminary analysis of mitochondrial 16S rRNA indicates that the new species differs from all other species with published sequence data by a minimum distance of 4.1% and has affinities with P. rungwensis, P. uzungwensis Grandison and Howell, 1983 and P. keniensis Barbour and Loveridge, 1928-all diminutive upland eastern African taxa. The shape and colour of the male's external gular apparatus distinguish this species from all other described Phrynobatrachus species. Although geographically either sympatric or closely allopatric with P. uzungwensis, the lack of overlapping morphological characters indicates the two forms are distinct species. The new taxon is compared with other species from the region.}, }
@article {pmid29244187, year = {2017}, author = {Salinas-Giegé, T and Cavaiuolo, M and Cognat, V and Ubrig, E and Remacle, C and Duchêne, AM and Vallon, O and Maréchal-Drouard, L}, title = {Polycytidylation of mitochondrial mRNAs in Chlamydomonas reinhardtii.}, journal = {Nucleic acids research}, volume = {45}, number = {22}, pages = {12963-12973}, pmid = {29244187}, issn = {1362-4962}, mesh = {Base Sequence ; Chlamydomonas reinhardtii/*genetics/metabolism ; Chlorophyta/classification/genetics ; Genome, Mitochondrial/genetics ; Mitochondria/*genetics/metabolism ; Phylogeny ; Poly C/metabolism ; RNA, Messenger/*genetics/metabolism ; RNA, Mitochondrial ; Sequence Homology, Nucleic Acid ; *Transcription, Genetic ; }, abstract = {The unicellular photosynthetic organism, Chlamydomonas reinhardtii, represents a powerful model to study mitochondrial gene expression. Here, we show that the 5'- and 3'-extremities of the eight Chlamydomonas mitochondrial mRNAs present two unusual characteristics. First, all mRNAs start primarily at the AUG initiation codon of the coding sequence which is often marked by a cluster of small RNAs. Second, unusual tails are added post-transcriptionally at the 3'-extremity of all mRNAs. The nucleotide composition of the tails is distinct from that described in any other systems and can be partitioned between A/U-rich tails, predominantly composed of Adenosine and Uridine, and C-rich tails composed mostly of Cytidine. Based on 3' RACE experiments, 22% of mRNAs present C-rich tails, some of them composed of up to 20 consecutive Cs. Polycytidylation is specific to mitochondria and occurs primarily on mRNAs. This unprecedented post-transcriptional modification seems to be a specific feature of the Chlorophyceae class of green algae and points out the existence of novel strategies in mitochondrial gene expression.}, }
@article {pmid29241459, year = {2017}, author = {Carrie, C and Soll, J}, title = {To Mia or not to Mia: stepwise evolution of the mitochondrial intermembrane space disulfide relay.}, journal = {BMC biology}, volume = {15}, number = {1}, pages = {119}, pmid = {29241459}, issn = {1741-7007}, mesh = {*Arabidopsis ; *Arabidopsis Proteins ; Disulfides ; Mitochondria ; Mitochondrial Membrane Transport Proteins ; Mitochondrial Proteins ; Oxidation-Reduction ; Oxidoreductases Acting on Sulfur Group Donors ; Saccharomyces cerevisiae ; *Saccharomyces cerevisiae Proteins ; }, abstract = {The disulfide relay system found in the intermembrane space (IMS) of mitochondria is an essential pathway for the import and oxidative folding of IMS proteins. Erv1, an essential member of this pathway, has been previously found to be ubiquitously present in mitochondria-containing eukaryotes. However, the other essential protein, Mia40, was found to be absent or not required in some organisms, raising questions about how the disulfide relay functions in these organisms. A recent study published in BMC Biology demonstrates for the first time that some Erv1 proteins can function in oxidative folding independently of a Mia40 protein, providing for the first time strong evidence that the IMS disulfide relay evolved in a stepwise manner.See research article: 10.1186/s12915-017-0445-8.}, }
@article {pmid29241457, year = {2017}, author = {Yalvac, ME and Amornvit, J and Braganza, C and Chen, L and Hussain, SA and Shontz, KM and Montgomery, CL and Flanigan, KM and Lewis, S and Sahenk, Z}, title = {Impaired regeneration in calpain-3 null muscle is associated with perturbations in mTORC1 signaling and defective mitochondrial biogenesis.}, journal = {Skeletal muscle}, volume = {7}, number = {1}, pages = {27}, pmid = {29241457}, issn = {2044-5040}, mesh = {AMP-Activated Protein Kinases/metabolism ; Animals ; Calpain/genetics/*metabolism ; Cells, Cultured ; Disease Models, Animal ; Genetic Therapy ; Mechanistic Target of Rapamycin Complex 1/*metabolism ; Mice, Inbred C57BL ; Mice, Knockout ; MicroRNAs/metabolism ; Muscle Proteins/genetics/*metabolism ; Muscle, Skeletal/metabolism/pathology/*physiology ; Muscular Dystrophies, Limb-Girdle/metabolism/physiopathology ; *Organelle Biogenesis ; Proto-Oncogene Proteins c-akt/metabolism ; *Regeneration ; Signal Transduction ; Transforming Growth Factor beta/metabolism ; }, abstract = {BACKGROUND: Previous studies in patients with limb-girdle muscular dystrophy type 2A (LGMD2A) have suggested that calpain-3 (CAPN3) mutations result in aberrant regeneration in muscle.<br><br>METHODS: To gain insight into pathogenesis of aberrant muscle regeneration in LGMD2A, we used a paradigm of cardiotoxin (CTX)-induced cycles of muscle necrosis and regeneration in the CAPN3-KO mice to simulate the early features of the dystrophic process in LGMD2A. The temporal evolution of the regeneration process was followed by assessing the oxidative state, size, and the number of metabolic fiber types at 4 and 12 weeks after last CTX injection. Muscles isolated at these time points were further investigated for the key regulators of the pathways involved in various cellular processes such as protein synthesis, cellular energy status, metabolism, and cell stress to include Akt/mTORC1 signaling, mitochondrial biogenesis, and AMPK signaling. TGF-β and microRNA (miR-1, miR-206, miR-133a) regulation were also assessed. Additional studies included in vitro assays for quantifying fusion index of myoblasts from CAPN3-KO mice and development of an in vivo gene therapy paradigm for restoration of impaired regeneration using the adeno-associated virus vector carrying CAPN3 gene in the muscle.<br><br>RESULTS: At 4 and 12 weeks after last CTX injection, we found impaired regeneration in CAPN3-KO muscle characterized by excessive numbers of small lobulated fibers belonging to oxidative metabolic type (slow twitch) and increased connective tissue. TGF-β transcription levels in the regenerating CAPN3-KO muscles were significantly increased along with microRNA dysregulation compared to wild type (WT), and the attenuated radial growth of muscle fibers was accompanied by perturbed Akt/mTORC1 signaling, uncoupled from protein synthesis, through activation of AMPK pathway, thought to be triggered by energy shortage in the CAPN3-KO muscle. This was associated with failure to increase mitochondria content, PGC-1α, and ATP5D transcripts in the regenerating CAPN3-KO muscles compared to WT. In vitro studies showed defective myotube fusion in CAPN3-KO myoblast cultures. Replacement of CAPN3 by gene therapy in vivo increased the fiber size and decreased the number of small oxidative fibers.<br><br>CONCLUSION: Our findings provide insights into understanding of the impaired radial growth phase of regeneration in calpainopathy.}, }
@article {pmid29221178, year = {2017}, author = {Díaz-Carballo, D and Klein, J and Acikelli, AH and Wilk, C and Saka, S and Jastrow, H and Wennemuth, G and Dammann, P and Giger-Pabst, U and Khosrawipour, V and Rassow, J and Nienen, M and Strumberg, D}, title = {Cytotoxic stress induces transfer of mitochondria-associated human endogenous retroviral RNA and proteins between cancer cells.}, journal = {Oncotarget}, volume = {8}, number = {56}, pages = {95945-95964}, pmid = {29221178}, issn = {1949-2553}, abstract = {About 8 % of the human genome consists of human endogenous retroviruses (HERVs), which are relicts of ancient exogenous retroviral infections incurred during evolution. Although the majority of HERVs have functional gene defects or epigenetic modifications, many of them are still able to produce retroviral proteins that have been proposed to be involved in cellular transformation and cancer development. We found that, in chemo-resistant U87RETO glioblastoma cells, cytotoxic stress induced by etoposide promotes accumulation and large-scale fission of mitochondria, associated with the detection of HERV-WE1 (syncytin-1) and HERV-FRD1 (syncytin-2) in these organelles. In addition, mitochondrial preparations also contained the corresponding receptors, i.e. ASCT2 and MFSD2. We clearly demonstrated that mitochondria associated with HERV-proteins were shuttled between adjacent cancer cells not only via tunneling tubes, but also by direct cellular uptake across the cell membrane. Furthermore, anti-syncytin-1 and anti-syncytin-2 antibodies were able to specifically block this direct cellular uptake of mitochondria even more than antibodies targeting the cognate receptors. Here, we suggest that the association of mitochondria with syncytin-1/syncytin-2 together with their respective receptors could represent a novel mechanism of cell-to-cell transfer. In chemotherapy-refractory cancer cells, this might open up attractive avenues to novel mitochondria-targeting therapies.}, }
@article {pmid29210936, year = {2018}, author = {Litts, KM and Zhang, Y and Freund, KB and Curcio, CA}, title = {OPTICAL COHERENCE TOMOGRAPHY AND HISTOLOGY OF AGE-RELATED MACULAR DEGENERATION SUPPORT MITOCHONDRIA AS REFLECTIVITY SOURCES.}, journal = {Retina (Philadelphia, Pa.)}, volume = {38}, number = {3}, pages = {445-461}, pmid = {29210936}, issn = {1539-2864}, support = {P30 EY003039/EY/NEI NIH HHS/United States ; R01 EY006109/EY/NEI NIH HHS/United States ; R01 EY024378/EY/NEI NIH HHS/United States ; R21 EY021903/EY/NEI NIH HHS/United States ; }, mesh = {Bruch Membrane/pathology ; Humans ; Macular Degeneration/diagnostic imaging/*pathology ; Mitochondria/*ultrastructure ; Retinal Cone Photoreceptor Cells/pathology ; Retinal Photoreceptor Cell Outer Segment/*pathology ; Retinal Pigment Epithelium/pathology ; Tomography, Optical Coherence/*methods ; }, abstract = {PURPOSE: Widespread adoption of optical coherence tomography has revolutionized the diagnosis and management of retinal disease. If the cellular and subcellular sources of reflectivity in optical coherence tomography can be identified, the value of this technology will be advanced even further toward precision medicine, mechanistic thinking, and molecular discovery. Four hyperreflective outer retinal bands are created by the exquisite arrangement of photoreceptors, Müller cells, retinal pigment epithelium, and Bruch membrane. Because of massed effects of these axially compartmentalized and transversely aligned cells, reflectivity can be localized to the subcellular level. This review focuses on the second of the four bands, called ellipsoid zone in a consensus clinical lexicon, with the central thesis that mitochondria in photoreceptor inner segments are a major independent reflectivity source in this band, because of Mie scattering and waveguiding.<br><br>METHODS: We review the evolution of Band 2 nomenclature in published literature and discuss the origins of imaging signals from photoreceptor mitochondria that could make these organelles visible in vivo.<br><br>RESULTS: Our recent data pertain to outer retinal tubulation, a unique neurodegenerative and gliotic structure with a highly reflective border, prominent in late age-related macular degeneration. High-resolution histology and multimodal imaging of outer retinal tubulation together provide evidence that inner segment mitochondria undergoing fission and translocation toward the nucleus provide the reflectivity signal.<br><br>CONCLUSION: Our data support adoption of the ellipsoid zone nomenclature. Identifying subcellular signal sources will newly inform clinical.}, }
@article {pmid29207267, year = {2017}, author = {Petitjean, C and Williams, TA}, title = {Evolution: New Gene-Rich Mitochondria Found across the Eukaryotic Tree.}, journal = {Current biology : CB}, volume = {27}, number = {23}, pages = {R1270-R1271}, doi = {10.1016/j.cub.2017.10.028}, pmid = {29207267}, issn = {1879-0445}, abstract = {Mitochondria are the energy-generating organelles that power eukaryotic cells. Originally descended from endosymbiotic bacteria, their genomes have shrunk during evolution. New analyses suggest that large, gene-rich mitochondrial genomes are more common than previously thought, with interesting implications for eukaryotic genome evolution.}, }
@article {pmid29202688, year = {2017}, author = {Abrahamian, M and Kagda, M and Ah-Fong, AMV and Judelson, HS}, title = {Rethinking the evolution of eukaryotic metabolism: novel cellular partitioning of enzymes in stramenopiles links serine biosynthesis to glycolysis in mitochondria.}, journal = {BMC evolutionary biology}, volume = {17}, number = {1}, pages = {241}, pmid = {29202688}, issn = {1471-2148}, mesh = {Animals ; *Biological Evolution ; Cytosol ; Eukaryotic Cells/*metabolism ; Genes ; *Glycolysis ; Mitochondria/genetics/*metabolism ; Oomycetes/metabolism ; Phosphorylation ; Phylogeny ; Phytophthora infestans/metabolism ; Serine/*biosynthesis ; Stramenopiles/*enzymology/*metabolism ; }, abstract = {BACKGROUND: An important feature of eukaryotic evolution is metabolic compartmentalization, in which certain pathways are restricted to the cytosol or specific organelles. Glycolysis in eukaryotes is described as a cytosolic process. The universality of this canon has been challenged by recent genome data that suggest that some glycolytic enzymes made by stramenopiles bear mitochondrial targeting peptides.<br><br>RESULTS: Mining of oomycete, diatom, and brown algal genomes indicates that stramenopiles encode two forms of enzymes for the second half of glycolysis, one with and the other without mitochondrial targeting peptides. The predicted mitochondrial targeting was confirmed by using fluorescent tags to localize phosphoglycerate kinase, phosphoglycerate mutase, and pyruvate kinase in Phytophthora infestans, the oomycete that causes potato blight. A genome-wide search for other enzymes with atypical mitochondrial locations identified phosphoglycerate dehydrogenase, phosphoserine aminotransferase, and phosphoserine phosphatase, which form a pathway for generating serine from the glycolytic intermediate 3-phosphoglycerate. Fluorescent tags confirmed the delivery of these serine biosynthetic enzymes to P. infestans mitochondria. A cytosolic form of this serine biosynthetic pathway, which occurs in most eukaryotes, is missing from oomycetes and most other stramenopiles. The glycolysis and serine metabolism pathways of oomycetes appear to be mosaics of enzymes with different ancestries. While some of the noncanonical oomycete mitochondrial enzymes have the closest affinity in phylogenetic analyses with proteins from other stramenopiles, others cluster with bacterial, plant, or animal proteins. The genes encoding the mitochondrial phosphoglycerate kinase and serine-forming enzymes are physically linked on oomycete chromosomes, which suggests a shared origin.<br><br>CONCLUSIONS: Stramenopile metabolism appears to have been shaped through the acquisition of genes by descent and lateral or endosymbiotic gene transfer, along with the targeting of the proteins to locations that are novel compared to other eukaryotes. Colocalization of the glycolytic and serine biosynthesis enzymes in mitochondria is apparently necessary since they share a common intermediate. The results indicate that descriptions of metabolism in textbooks do not cover the full diversity of eukaryotic biology.}, }
@article {pmid29202174, year = {2018}, author = {Wragg, D and Techer, MA and Canale-Tabet, K and Basso, B and Bidanel, JP and Labarthe, E and Bouchez, O and Le Conte, Y and Clémencet, J and Delatte, H and Vignal, A}, title = {Autosomal and Mitochondrial Adaptation Following Admixture: A Case Study on the Honeybees of Reunion Island.}, journal = {Genome biology and evolution}, volume = {10}, number = {1}, pages = {220-238}, pmid = {29202174}, issn = {1759-6653}, mesh = {Acclimatization ; Adaptation, Physiological ; Animals ; Bees/*genetics/physiology ; DNA, Mitochondrial/genetics ; Female ; Genome, Insect ; Genome, Mitochondrial ; Male ; Mitochondria/*genetics/metabolism ; Reunion ; }, abstract = {The honeybee population of the tropical Reunion Island is a genetic admixture of the Apis mellifera unicolor subspecies, originally described in Madagascar, and of European subspecies, mainly A. m. carnica and A. m. ligustica, regularly imported to the island since the late 19th century. We took advantage of this population to study genetic admixing of the tropical-adapted indigenous and temperate-adapted European genetic backgrounds. Whole genome sequencing of 30 workers and 6 males from Reunion, compared with samples from Europe, Madagascar, Mauritius, Rodrigues, and the Seychelles, revealed the Reunion honeybee population to be composed on an average of 53.2 ± 5.9% A. m. unicolor nuclear genomic background, the rest being mainly composed of A. m. carnica and to a lesser extent A. m. ligustica. In striking contrast to this, only 1 out of the 36 honeybees from Reunion had a mitochondrial genome of European origin, suggesting selection has favored the A. m. unicolor mitotype, which is possibly better adapted to the island's bioclimate. Local ancestry was determined along the chromosomes for all Reunion samples, and a test for preferential selection for the A. m. unicolor or European background revealed 15 regions significantly associated with the A. m. unicolor lineage and 9 regions with the European lineage. Our results provide insights into the long-term consequences of introducing exotic specimen on the nuclear and mitochondrial genomes of locally adapted populations.}, }
@article {pmid29199107, year = {2018}, author = {Solano-Zavaleta, I and Nieto-Montes de Oca, A}, title = {Species limits in the Morelet's Alligator lizard (Anguidae: Gerrhonotinae).}, journal = {Molecular phylogenetics and evolution}, volume = {120}, number = {}, pages = {16-27}, doi = {10.1016/j.ympev.2017.11.011}, pmid = {29199107}, issn = {1095-9513}, mesh = {Alligators and Crocodiles/*physiology ; Animals ; Bayes Theorem ; Cell Nucleus/genetics ; Central America ; DNA, Mitochondrial/genetics ; Lizards/genetics/*physiology ; Mitochondria/genetics ; Phylogeny ; Phylogeography ; Species Specificity ; Time Factors ; }, abstract = {The widely distributed, Central American anguid lizard Mesaspis moreletii is currently recognized as a polytypic species with five subspecies (M. m. fulvus, M. m. moreletii, M. m. rafaeli, M. m. salvadorensis, and M. m. temporalis). We reevaluated the species limits within Mesaspis moreletii using DNA sequences of one mitochondrial and three nuclear genes. The multi-locus data set included samples of all of the subspecies of M. moreletii, the other species of Mesaspis in Central America (M. cuchumatanus and M. monticola), and some populations assignable to M. moreletii but of uncertain subspecific identity from Honduras and Nicaragua. We first used a tree-based method for delimiting species based on mtDNA data to identify potential evolutionary independent lineages, and then analized the multilocus dataset with two species delimitation methods that use the multispecies coalescent model to evaluate different competing species delimitation models: the Bayes factors species delimitation method (BFD) implemented in ∗BEAST, and the Bayesian Phylogenetics and Phylogeography (BP&amp;P) method. Our results suggest that M. m. moreletii, M. m. rafaeli, M. m. salvadorensis, and M. m. temporalis represent distinct evolutionary independent lineages, and that the populations of uncertain status from Honduras and Nicaragua may represent additional undescribed species. Our results also suggest that M. m. fulvus is a synonym of M. m. moreletii. The biogeography of the Central American lineages of Mesaspis is discussed.}, }
@article {pmid29196205, year = {2018}, author = {Medina, CD and Avila, LJ and Sites, JW and Santos, J and Morando, M}, title = {Alternative methods of phylogenetic inference for the Patagonian lizard group Liolaemus elongatus-kriegi (Iguania: Liolaemini) based on mitochondrial and nuclear markers.}, journal = {Molecular phylogenetics and evolution}, volume = {120}, number = {}, pages = {158-169}, doi = {10.1016/j.ympev.2017.11.017}, pmid = {29196205}, issn = {1095-9513}, mesh = {Animals ; Bayes Theorem ; Cell Nucleus/*genetics ; Cytochromes b/classification/genetics/metabolism ; DNA/chemistry/isolation &amp; purification/metabolism ; Databases, Genetic ; Lizards/*classification/genetics ; Mitochondria/*genetics ; Phylogeny ; RNA, Ribosomal/chemistry/classification/genetics ; Sequence Analysis, DNA ; }, abstract = {We present different approaches to a multi-locus phylogeny for the Liolaemus elongatus-kriegi group, including almost all species and recognized lineages. We sequenced two mitochondrial and five nuclear gene regions for 123 individuals from 35 taxa, and compared relationships resolved from concatenated and species tree methods. The L. elongatus-kriegi group was inferred as monophyletic in three of the five analyses (concatenated mitochondrial, concatenated mitochondrial + nuclear gene trees, and SVD quartet species tree). The mitochondrial gene tree resolved four haploclades, three corresponding to the previously recognized complexes: L. elongatus, L. kriegi and L. petrophilus complexes, and the L. punmahuida group. The BEAST species tree approach included the L. punmahuida group within the L. kriegi complex, but the SVD quartet method placed it as sister to the L. elongatus-kriegi group. BEAST inferred species of the L. elongatus and L. petrophilus complexes as one clade, while SVDquartet inferred these two complexes as monophyletic (although with no statistical support for the L. petrophilus complex). The species tree approach also included the L. punmahuida group as part of the L. elongatus-kriegi group. Our study provides detailed multilocus phylogenetic hypotheses for the L. elongatus-kriegi group, and we discuss possible reasons for differences in the concatenation and species tree methods.}, }
@article {pmid29195856, year = {2018}, author = {Chakraborty, S and Uddin, A and Mazumder, TH and Choudhury, MN and Malakar, AK and Paul, P and Halder, B and Deka, H and Mazumder, GA and Barbhuiya, RA and Barbhuiya, MA and Devi, WJ}, title = {Codon usage and expression level of human mitochondrial 13 protein coding genes across six continents.}, journal = {Mitochondrion}, volume = {42}, number = {}, pages = {64-76}, doi = {10.1016/j.mito.2017.11.006}, pmid = {29195856}, issn = {1872-8278}, mesh = {*Codon ; Computational Biology ; Electron Transport Chain Complex Proteins/*genetics ; *Gene Expression Profiling ; Global Health ; Humans ; Mitochondrial Proteins/*genetics ; Phylogeography ; Selection, Genetic ; }, abstract = {The study of codon usage coupled with phylogenetic analysis is an important tool to understand the genetic and evolutionary relationship of a gene. The 13 protein coding genes of human mitochondria are involved in electron transport chain for the generation of energy currency (ATP). However, no work has yet been reported on the codon usage of the mitochondrial protein coding genes across six continents. To understand the patterns of codon usage in mitochondrial genes across six different continents, we used bioinformatic analyses to analyze the protein coding genes. The codon usage bias was low as revealed from high ENC value. Correlation between codon usage and GC3 suggested that all the codons ending with G/C were positively correlated with GC3 but vice versa for A/T ending codons with the exception of ND4L and ND5 genes. Neutrality plot revealed that for the genes ATP6, COI, COIII, CYB, ND4 and ND4L, natural selection might have played a major role while mutation pressure might have played a dominant role in the codon usage bias of ATP8, COII, ND1, ND2, ND3, ND5 and ND6 genes. Phylogenetic analysis indicated that evolutionary relationships in each of 13 protein coding genes of human mitochondria were different across six continents and further suggested that geographical distance was an important factor for the origin and evolution of 13 protein coding genes of human mitochondria.}, }
@article {pmid29193148, year = {2018}, author = {Damerau, M and Freese, M and Hanel, R}, title = {Multi-gene phylogeny of jacks and pompanos (Carangidae), including placement of monotypic vadigo Campogramma glaycos.}, journal = {Journal of fish biology}, volume = {92}, number = {1}, pages = {190-202}, doi = {10.1111/jfb.13509}, pmid = {29193148}, issn = {1095-8649}, mesh = {Animals ; Bayes Theorem ; Cell Nucleus ; DNA, Mitochondrial ; Fishes/*genetics ; Likelihood Functions ; Mitochondria/genetics ; *Phylogeny ; Sequence Alignment ; Sequence Analysis, DNA ; }, abstract = {In this study, the phylogenetic trees of jacks and pompanos (Carangidae), an ecologically and morphologically diverse, globally distributed fish family, are inferred from a complete, concatenated data set of two mitochondrial (cytochrome c oxidase I, cytochrome b) loci and one nuclear (myosin heavy chain 6) locus. Maximum likelihood and Bayesian inferences are largely congruent and show a clear separation of Carangidae into the four subfamilies: Scomberoidinae, Trachinotinae, Naucratinae and Caranginae. The inclusion of the carangid sister lineages Coryphaenidae (dolphinfishes) and Rachycentridae (cobia), however, render Carangidae paraphyletic. The phylogenetic trees also show with high statistical support that the monotypic vadigo Campogramma glaycos is the sister to all other species within the Naucratinae.}, }
@article {pmid29191733, year = {2018}, author = {Chatterjee, K and Nostramo, RT and Wan, Y and Hopper, AK}, title = {tRNA dynamics between the nucleus, cytoplasm and mitochondrial surface: Location, location, location.}, journal = {Biochimica et biophysica acta. Gene regulatory mechanisms}, volume = {1861}, number = {4}, pages = {373-386}, pmid = {29191733}, issn = {1874-9399}, support = {R01 GM027930/GM/NIGMS NIH HHS/United States ; R01 GM122884/GM/NIGMS NIH HHS/United States ; }, mesh = {Animals ; Biological Transport ; Cell Nucleus/*metabolism ; Cytoplasm/*metabolism ; Endoribonucleases/metabolism ; Evolution, Molecular ; Fungal Proteins/metabolism ; HSP70 Heat-Shock Proteins/metabolism ; Mitochondrial Membranes/*metabolism ; Nuclear Pore Complex Proteins/metabolism ; Nucleocytoplasmic Transport Proteins/*metabolism ; Plant Proteins/metabolism ; RNA Precursors/metabolism ; RNA Processing, Post-Transcriptional ; RNA, Transfer/*metabolism ; RNA-Binding Proteins/metabolism ; Saccharomyces cerevisiae Proteins/metabolism ; Transcription, Genetic ; Vertebrates/metabolism ; Yeasts/metabolism ; }, abstract = {Although tRNAs participate in the essential function of protein translation in the cytoplasm, tRNA transcription and numerous processing steps occur in the nucleus. This subcellular separation between tRNA biogenesis and function requires that tRNAs be efficiently delivered to the cytoplasm in a step termed &quot;primary tRNA nuclear export&quot;. Surprisingly, tRNA nuclear-cytoplasmic traffic is not unidirectional, but, rather, movement is bidirectional. Cytoplasmic tRNAs are imported back to the nucleus by the &quot;tRNA retrograde nuclear import&quot; step which is conserved from budding yeast to vertebrate cells and has been hijacked by viruses, such as HIV, for nuclear import of the viral reverse transcription complex in human cells. Under appropriate environmental conditions cytoplasmic tRNAs that have been imported into the nucleus return to the cytoplasm via the 3rd nuclear-cytoplasmic shuttling step termed &quot;tRNA nuclear re-export&quot;, that again is conserved from budding yeast to vertebrate cells. We describe the 3 steps of tRNA nuclear-cytoplasmic movements and their regulation. There are multiple tRNA nuclear export and import pathways. The different tRNA nuclear exporters appear to possess substrate specificity leading to the tantalizing possibility that the cellular proteome may be regulated at the level of tRNA nuclear export. Moreover, in some organisms, such as budding yeast, the pre-tRNA splicing heterotetrameric endonuclease (SEN), which removes introns from pre-tRNAs, resides on the cytoplasmic surface of the mitochondria. Therefore, we also describe the localization of the SEN complex to mitochondria and splicing of pre-tRNA on mitochondria, which occurs prior to the participation of tRNAs in protein translation. This article is part of a Special Issue entitled: SI: Regulation of tRNA synthesis and modification in physiological conditions and disease edited by Dr. Boguta Magdalena.}, }
@article {pmid29187976, year = {2017}, author = {Conner, WR and Blaxter, ML and Anfora, G and Ometto, L and Rota-Stabelli, O and Turelli, M}, title = {Genome comparisons indicate recent transfer of wRi-like Wolbachia between sister species Drosophila suzukii and D. subpulchrella.}, journal = {Ecology and evolution}, volume = {7}, number = {22}, pages = {9391-9404}, pmid = {29187976}, issn = {2045-7758}, abstract = {Wolbachia endosymbionts may be acquired by horizontal transfer, by introgression through hybridization between closely related species, or by cladogenic retention during speciation. All three modes of acquisition have been demonstrated, but their relative frequency is largely unknown. Drosophila suzukii and its sister species D. subpulchrella harbor Wolbachia, denoted wSuz and wSpc, very closely related to wRi, identified in California populations of D. simulans. However, these variants differ in their induced phenotypes: wRi causes significant cytoplasmic incompatibility (CI) in D. simulans, but CI has not been detected in D. suzukii or D. subpulchrella. Our draft genomes of wSuz and wSpc contain full-length copies of 703 of the 734 single-copy genes found in wRi. Over these coding sequences, wSuz and wSpc differ by only 0.004% (i.e., 28 of 704,883 bp); they are sisters relative to wRi, from which each differs by 0.014%-0.015%. Using published data from D. melanogaster, Nasonia wasps and Nomada bees to calibrate relative rates of Wolbachia versus host nuclear divergence, we conclude that wSuz and wSpc are too similar-by at least a factor of 100-to be plausible candidates for cladogenic transmission. These three wRi-like Wolbachia, which differ in CI phenotype in their native hosts, have different numbers of orthologs of genes postulated to contribute to CI; and the CI loci differ at several nucleotides that may account for the CI difference. We discuss the general problem of distinguishing alternative modes of Wolbachia acquisition, focusing on the difficulties posed by limited knowledge of variation in absolute and relative rates of molecular evolution for host nuclear genomes, mitochondria, and Wolbachia.}, }
@article {pmid29182013, year = {2017}, author = {Dickerson, T and Jauregui, CE and Teng, Y}, title = {Friend or foe? Mitochondria as a pharmacological target in cancer treatment.}, journal = {Future medicinal chemistry}, volume = {9}, number = {18}, pages = {2197-2210}, doi = {10.4155/fmc-2017-0110}, pmid = {29182013}, issn = {1756-8927}, mesh = {ATPases Associated with Diverse Cellular Activities/metabolism ; Adenosine Triphosphate/metabolism ; Animals ; Antineoplastic Agents/pharmacology/therapeutic use ; DNA, Mitochondrial/drug effects/metabolism ; Energy Metabolism/drug effects ; Humans ; Membrane Proteins/metabolism ; Mitochondria/genetics/*metabolism ; Mitochondrial Proteins/metabolism ; Neoplasms/*drug therapy/metabolism/pathology ; Reactive Oxygen Species/metabolism ; Signal Transduction/drug effects ; }, abstract = {Mitochondria have acquired numerous functions over the course of evolution, such as those involved in controlling energy production, cellular metabolism, cell survival, apoptosis and autophagy within host cells. Tumor cells can develop defects in mitochondrial function, presenting a potential strategy for designing selective anticancer therapies. Therefore, cancer has been the main focus of recent research to uncover possible mitochondrial targets for therapeutic benefit. This comprehensive review covers not only the recent discoveries of the roles of mitochondria in cancer development, progression and therapeutic implications but also the findings regarding emerging mitochondrial therapeutic targets and mitochondria-targeted agents. Current challenges and future directions for developments and applications of mitochondrial-targeted therapeutics are also discussed.}, }
@article {pmid29179728, year = {2017}, author = {Li, D and Du, X and Guo, X and Zhan, L and Li, X and Yin, C and Chen, C and Li, M and Li, B and Yang, H and Xing, J}, title = {Site-specific selection reveals selective constraints and functionality of tumor somatic mtDNA mutations.}, journal = {Journal of experimental &amp; clinical cancer research : CR}, volume = {36}, number = {1}, pages = {168}, pmid = {29179728}, issn = {1756-9966}, mesh = {Amino Acids/genetics ; Codon/genetics ; DNA, Mitochondrial/chemistry/*genetics ; Databases, Genetic ; Humans ; Mitochondria/chemistry/*genetics ; Mutation Rate ; Neoplasms/*genetics ; *Point Mutation ; Selection, Genetic ; }, abstract = {BACKGROUND: Previous studies have indicated that tumor mitochondrial DNA (mtDNA) mutations are primarily shaped by relaxed negative selection, which is contradictory to the critical roles of mtDNA mutations in tumorigenesis. Therefore, we hypothesized that site-specific selection may influence tumor mtDNA mutations.<br><br>METHODS: To test our hypothesis, we developed the largest collection of tumor mtDNA mutations to date and evaluated how natural selection shaped mtDNA mutation patterns.<br><br>RESULTS: Our data demonstrated that both positive and negative selections acted on specific positions or functional units of tumor mtDNAs, although the landscape of these mutations was consistent with the relaxation of negative selection. In particular, mutation rate (mutation number in a region/region bp length) in complex V and tRNA coding regions, especially in ATP8 within complex V and in loop and variable regions within tRNA, were significantly lower than those in other regions. While the mutation rate of most codons and amino acids were consistent with the expectation under neutrality, several codons and amino acids had significantly different rates. Moreover, the mutations under selection were enriched for changes that are predicted to be deleterious, further supporting the evolutionary constraints on these regions.<br><br>CONCLUSION: These results indicate the existence of site-specific selection and imply the important role of the mtDNA mutations at some specific sites in tumor development.}, }
@article {pmid29178068, year = {2017}, author = {Wang, L and Liebmen, MN and Wang, X}, title = {Roles of Mitochondrial DNA Signaling in Immune Responses.}, journal = {Advances in experimental medicine and biology}, volume = {1038}, number = {}, pages = {39-53}, doi = {10.1007/978-981-10-6674-0_4}, pmid = {29178068}, issn = {0065-2598}, mesh = {Animals ; *Autophagy/genetics/immunology ; *CRISPR-Cas Systems ; *DNA, Mitochondrial/genetics/immunology ; *Gene Editing ; Humans ; *Immune System Diseases/genetics/immunology/therapy ; *Mitochondria/genetics/immunology/pathology ; Toll-Like Receptor 9/genetics/immunology ; }, abstract = {Mitochondrial DNA (mtDNA) plays an important role in immune responses during the evolution. The present chapter systemically describes its role on immune-related diseases and its interaction on immune responses. It is important to explore the main function and mechanisms of mtDNA in immune responses by which mtDNA regulates the signaling pathways of Toll-like receptor 9, autophagy, and STING. There are potentials to discover therapeutic targets of mtDNA in immune diseases and inflammation. It will be more exciting if the CRISPR-Cas9 method can be applied for mtDNA gene editing to cure diseases and provide a novel insight of mtDNA in immune responses as well as new therapies.}, }
@article {pmid29177973, year = {2017}, author = {Niu, Y and Moghimyfiroozabad, S and Safaie, S and Yang, Y and Jonas, EA and Alavian, KN}, title = {Phylogenetic Profiling of Mitochondrial Proteins and Integration Analysis of Bacterial Transcription Units Suggest Evolution of F1Fo ATP Synthase from Multiple Modules.}, journal = {Journal of molecular evolution}, volume = {85}, number = {5-6}, pages = {219-233}, pmid = {29177973}, issn = {1432-1432}, mesh = {Adenosine Triphosphate/biosynthesis ; Evolution, Molecular ; Humans ; Mitochondria/genetics/metabolism ; Mitochondrial Proteins/genetics/metabolism ; Mitochondrial Proton-Translocating ATPases/*genetics/*metabolism ; Phylogeny ; Protein Domains ; Protein Structural Elements/genetics ; Transcription, Genetic/genetics ; }, abstract = {ATP synthase is a complex universal enzyme responsible for ATP synthesis across all kingdoms of life. The F-type ATP synthase has been suggested to have evolved from two functionally independent, catalytic (F1) and membrane bound (Fo), ancestral modules. While the modular evolution of the synthase is supported by studies indicating independent assembly of the two subunits, the presence of intermediate assembly products suggests a more complex evolutionary process. We analyzed the phylogenetic profiles of the human mitochondrial proteins and bacterial transcription units to gain additional insight into the evolution of the F-type ATP synthase complex. In this study, we report the presence of intermediary modules based on the phylogenetic profiles of the human mitochondrial proteins. The two main intermediary modules comprise the α3β3 hexamer in the F1 and the c-subunit ring in the Fo. A comprehensive analysis of bacterial transcription units of F1Fo ATP synthase revealed that while a long and constant order of F1Fo ATP synthase genes exists in a majority of bacterial genomes, highly conserved combinations of separate transcription units are present among certain bacterial classes and phyla. Based on our findings, we propose a model that includes the involvement of multiple modules in the evolution of F1Fo ATP synthase. The central and peripheral stalk subunits provide a link for the integration of the F1/Fo modules.}, }
@article {pmid29176839, year = {2017}, author = {Peçanha, WT and Althoff, SL and Galiano, D and Quintela, FM and Maestri, R and Gonçalves, GL and Freitas, TRO}, title = {Pleistocene climatic oscillations in Neotropical open areas: Refuge isolation in the rodent Oxymycterus nasutus endemic to grasslands.}, journal = {PloS one}, volume = {12}, number = {11}, pages = {e0187329}, pmid = {29176839}, issn = {1932-6203}, mesh = {Animals ; Base Sequence ; Bayes Theorem ; Brazil ; Cell Nucleus/genetics ; DNA, Mitochondrial/genetics ; Genetic Markers ; Genetic Variation ; Geography ; *Grassland ; Haplotypes/genetics ; Mitochondria/genetics ; Models, Theoretical ; *Paleontology ; Phylogeny ; Rodentia/genetics/*physiology ; Skull/anatomy &amp; histology ; Species Specificity ; Time Factors ; *Tropical Climate ; Uruguay ; }, abstract = {Pleistocene climatic oscillations favoured the expansion of grassland ecosystems and open vegetation landscapes throughout the Neotropics, and influenced the evolutionary history of species adapted to such environments. In this study, we sampled populations of the rodent Oxymycterus nasutus endemic to open areas in the Pampas and Atlantic Forest biomes to assess the tempo and mode of population divergence using an integrative approach, including coalescence theory, ecological niche models, and morphometry. Our results indicated that these O. nasutus populations exhibited high levels of genetic structure. Six major mtDNA clades were found, structuring these biomes into distinct groups. Estimates of their divergence times was indicated to be 0.571 myr. The high degree of genetic structure is reflected in the analyses of geometric morphometric; skull differences between lineages in the two ecoregions were detected. During the last glacial maximum, there was a strong increase in suitable abiotic conditions for O. nasutus. Distinct molecular markers revealed a population expansion over time, with a possible demographic retraction during the post-glacial period. Considering that all clades coalesce with the last interglacial maximum, our results indicated that reduction in suitable conditions during this period may have resulted in a possible vicariance associated with refuge isolation.}, }
@article {pmid29174633, year = {2018}, author = {Praefcke, GJK}, title = {Regulation of innate immune functions by guanylate-binding proteins.}, journal = {International journal of medical microbiology : IJMM}, volume = {308}, number = {1}, pages = {237-245}, doi = {10.1016/j.ijmm.2017.10.013}, pmid = {29174633}, issn = {1618-0607}, abstract = {Guanylate-binding proteins (GBP) are a family of dynamin-related large GTPases which are expressed in response to interferons and other pro-inflammatory cytokines. GBPs mediate a broad spectrum of innate immune functions against intracellular pathogens ranging from viruses to bacteria and protozoa. Several binding partners for individual GBPs have been identified and several different mechanisms of action have been proposed depending on the organisms, the cell type and the pathogen used. Many of these anti-pathogenic functions of GBPs involve the recruitment to and the subsequent destruction of pathogen containing vacuolar compartments, the assembly of large oligomeric innate immune complexes such as the inflammasome, or the induction of autophagy. Furthermore, GBPs often cooperate with immunity-related GTPases (IRGs), another family of dynamin-related GTPases, to exert their anti-pathogenic function, but since most IRGs have been lost in the evolution of higher primates, the anti-pathogenic function of human GBPs seems to be IRG-independent. GBPs and IRGs share biochemical and structural properties with the other members of the dynamin superfamily such as low nucleotide affinity and a high intrinsic GTPase activity which can be further enhanced by oligomerisation. Furthermore, GBPs and IRGs can interact with lipid membranes. In the case of three human and murine GBP isoforms this interaction is mediated by C-terminal isoprenylation. Based on cell biological studies, and in analogy to the function of other dynamins in membrane scission events, it has been postulated that both GBPs and IRGs might actively disrupt the outer membrane of pathogen-containing vacuole leading to the detection and destruction of the pathogen by the cytosolic innate immune system of the host. Recent evidence, however, indicates that GBPs might rather function by mediating membrane tethering events similar to the dynamin-related atlastin and mitofusin proteins, which mediate fusion of the ER and mitochondria, respectively. The aim of this review is to highlight the current knowledge on the function of GBPs in innate immunity and to combine it with the recent progress in the biochemical characterisation of this protein family.}, }
@article {pmid29171872, year = {2017}, author = {Luévano-Martínez, LA and Kowaltowski, AJ}, title = {Topological characterization of the mitochondrial phospholipid scramblase 3.}, journal = {FEBS letters}, volume = {591}, number = {24}, pages = {4056-4066}, doi = {10.1002/1873-3468.12917}, pmid = {29171872}, issn = {1873-3468}, mesh = {Animals ; Cardiolipins/chemistry/metabolism ; Crystallography, X-Ray ; Intracellular Membranes/metabolism ; Male ; Mitochondria/*enzymology ; Models, Molecular ; Phospholipid Transfer Proteins/*chemistry/genetics/metabolism ; Phylogeny ; Rats ; Rats, Sprague-Dawley ; Saccharomyces cerevisiae ; }, abstract = {Scramblases redistribute phospholipids in biological membranes. Phospholipid scramblase 3 (PLSCR3), which is located in mitochondria, has been reported to be involved in cardiolipin distribution from the inner to the outer membrane, thus regulating cellular processes such as apoptosis or mitophagy. However, the localization and topology of this protein has not been convincingly addressed to support a role in intermembrane phospholipid transfer. Here, we studied PLSCR3 topology within mitochondria. We show that PLSCR3 inserts in the inner membrane (IM) via its C-terminal transmembrane helix, whereas its N-terminal portion is oriented toward the intermembrane space where it is activated by calcium. Our results suggest that PLSCR3, via its C-terminal transmembrane domain, participates in the bidirectional movement of phospholipids within the IM.}, }
@article {pmid29171834, year = {2017}, author = {Quandt, CA and Beaudet, D and Corsaro, D and Walochnik, J and Michel, R and Corradi, N and James, TY}, title = {The genome of an intranuclear parasite, Paramicrosporidium saccamoebae, reveals alternative adaptations to obligate intracellular parasitism.}, journal = {eLife}, volume = {6}, number = {}, pages = {}, pmid = {29171834}, issn = {2050-084X}, mesh = {*Adaptation, Biological ; Amoeba/microbiology ; Animals ; Fungi/*genetics ; *Genome, Fungal ; *Host-Parasite Interactions ; Molecular Sequence Annotation ; Sequence Analysis, DNA ; }, abstract = {Intracellular parasitism often results in gene loss, genome reduction, and dependence upon the host for cellular functioning. Rozellomycota is a clade comprising many such parasites and is related to the diverse, highly reduced, animal parasites, Microsporidia. We sequenced the nuclear and mitochondrial genomes of Paramicrosporidium saccamoebae [Rozellomycota], an intranuclear parasite of amoebae. A canonical fungal mitochondrial genome was recovered from P. saccamoebae that encodes genes necessary for the complete oxidative phosphorylation pathway including Complex I, differentiating it from most endoparasites including its sequenced relatives in Rozellomycota and Microsporidia. Comparative analysis revealed that P. saccamoebae shares more gene content with distantly related Fungi than with its closest relatives, suggesting that genome evolution in Rozellomycota and Microsporidia has been affected by repeated and independent gene losses, possibly as a result of variation in parasitic strategies (e.g. host and subcellular localization) or due to multiple transitions to parasitism.}, }
@article {pmid29168500, year = {2017}, author = {Bohnert, KA and Kenyon, C}, title = {A lysosomal switch triggers proteostasis renewal in the immortal C. elegans germ lineage.}, journal = {Nature}, volume = {551}, number = {7682}, pages = {629-633}, pmid = {29168500}, issn = {1476-4687}, support = {P40 OD010440/OD/NIH HHS/United States ; R01 AG011816/AG/NIA NIH HHS/United States ; R37 AG011816/AG/NIA NIH HHS/United States ; }, mesh = {Animals ; Biological Evolution ; Caenorhabditis elegans/*cytology/*metabolism ; Caenorhabditis elegans Proteins/metabolism ; *Cell Lineage ; Female ; Fertilization ; Hormones/metabolism ; Hydrogen-Ion Concentration ; Lysosomes/*metabolism ; Male ; Mitochondria/metabolism ; Oocytes/*cytology/enzymology/*metabolism ; Oogenesis ; Protein Aggregation, Pathological/metabolism ; *Proteostasis ; Signal Transduction ; Spermatozoa/metabolism ; Vacuolar Proton-Translocating ATPases/biosynthesis/metabolism ; Xenopus ; }, abstract = {Although individuals age and die with time, an animal species can continue indefinitely, because of its immortal germ-cell lineage. How the germline avoids transmitting damage from one generation to the next remains a fundamental question in biology. Here we identify a lysosomal switch that enhances germline proteostasis before fertilization. We find that Caenorhabditis elegans oocytes whose maturation is arrested by the absence of sperm exhibit hallmarks of proteostasis collapse, including protein aggregation. Remarkably, sperm-secreted hormones re-establish oocyte proteostasis once fertilization becomes imminent. Key to this restoration is activation of the vacuolar H+-ATPase (V-ATPase), a proton pump that acidifies lysosomes. Sperm stimulate V-ATPase activity in oocytes by signalling the degradation of GLD-1, a translational repressor that blocks V-ATPase synthesis. Activated lysosomes, in turn, promote a metabolic shift that mobilizes protein aggregates for degradation, and reset proteostasis by enveloping and clearing the aggregates. Lysosome acidification also occurs during Xenopus oocyte maturation; thus, a lysosomal switch that enhances oocyte proteostasis in anticipation of fertilization may be conserved in other species.}, }
@article {pmid29162845, year = {2017}, author = {Chatre, L and Fernandes, J and Michel, V and Fiette, L and Avé, P and Arena, G and Jain, U and Haas, R and Wang, TC and Ricchetti, M and Touati, E}, title = {Helicobacter pylori targets mitochondrial import and components of mitochondrial DNA replication machinery through an alternative VacA-dependent and a VacA-independent mechanisms.}, journal = {Scientific reports}, volume = {7}, number = {1}, pages = {15901}, pmid = {29162845}, issn = {2045-2322}, abstract = {Targeting mitochondria is a powerful strategy for pathogens to subvert cell physiology and establish infection. Helicobacter pylori is a bacterial pathogen associated with gastric cancer development that is known to target mitochondria directly and exclusively through its pro-apoptotic and vacuolating cytotoxin VacA. By in vitro infection of gastric epithelial cells with wild-type and VacA-deficient H. pylori strains, treatment of cells with purified VacA proteins and infection of a mouse model, we show that H. pylori deregulates mitochondria by two novel mechanisms, both rather associated with host cell survival. First, early upon infection VacA induces transient increase of mitochondrial translocases and a dramatic accumulation of the mitochondrial DNA replication and maintenance factors POLG and TFAM. These events occur when VacA is not detected intracellularly, therefore do not require the direct interaction of the cytotoxin with the organelle, and are independent of the toxin vacuolating activity. In vivo, these alterations coincide with the evolution of gastric lesions towards severity. Second, H. pylori also induces VacA-independent alteration of mitochondrial replication and import components, suggesting the involvement of additional H. pylori activities in mitochondria-mediated effects. These data unveil two novel mitochondrial effectors in H. pylori-host interaction with links on gastric pathogenesis.}, }
@article {pmid29161481, year = {2017}, author = {Arrivillaga-Henríquez, J and Enríquez, S and Romero, V and Echeverría, G and Pérez-Barrera, J and Poveda, A and Navarro, JC and Warburg, A and Benítez, W}, title = {[Eco-epidemiological aspects, natural detection and molecular identification of Leishmania spp. in Lutzomyia reburra, Lutzomyia barrettoi majuscula and Lutzomyia trapidoi].}, journal = {Biomedica : revista del Instituto Nacional de Salud}, volume = {37}, number = {0}, pages = {83-97}, doi = {10.7705/biomedica.v37i0.3536}, pmid = {29161481}, issn = {0120-4157}, mesh = {Animals ; Cell Nucleus/enzymology ; DNA Topoisomerases, Type II/genetics ; DNA, Protozoan/analysis ; DNA, Ribosomal Spacer/analysis ; Ecuador ; Feeding Behavior ; Female ; Insect Vectors/*parasitology ; Leishmania/genetics/*isolation &amp; purification/physiology ; Leishmaniasis, Cutaneous/parasitology/*transmission ; Mitochondria/enzymology ; Phylogeny ; Phylogeography ; Protozoan Proteins/genetics ; Psychodidae/*parasitology ; Species Specificity ; }, abstract = {INTRODUCTION: The province of Pichincha in Ecuador is an endemic area of cutaneous leishmaniasis, where anthropophilic sand flies with natural infection by Leishmania, have been reported as vectors. However, the role in transmission of zoophilic species has not been evaluated.<br><br>OBJECTIVE: To evaluate natural infection by Leishmania in two zoophilic phlebotomine sand fly species, Lutzomyia reburra and Lu. barrettoi majuscula, and one anthropophilic species, Lu. trapidoi, as well as the endophagy and synanthropism of these species in the northwest of Pichincha.<br><br>MATERIALS AND METHODS: Phlebotomines were collected using CDC light traps in different habitats and altitudes with presence of cutaneous leishmaniasis. Leishmania infection was detected using genomic DNA from females of the collected sand flies. We amplified the internal transcribed spacer gene of ribosomal RNA I (ITS1), the mitochondrial topoisomerase II gene (mtTOPOII), and the nuclear topoisomerase II gene (TopoII). Percentages of positivity for Leishmania, at spatio-temporal scale, proportion of endophagy and synanthropism index were calculated.<br><br>RESULTS: Natural infection was determined for Le. amazonensis in Lu. reburra (9.5%) and Lu. b. majuscula (23.8%), while in Lu. trapidoi we detected Le. amazonensis, Le. brazilienis and Le. naiffi-lainsoni. Phlebotomines were asynanthropic and with low endophagy.<br><br>CONCLUSION: Natural infection with Le. amazonensis was recorded for the first time in Lu. reburra and Lu. b. majuscula, demonstrating the importance of zoophilic phlebotomines in the maintenance of the Leishmania transmission cycle in endemic foci.}, }
@article {pmid29160602, year = {2018}, author = {Guedes-Monteiro, RF and Ferreira-Junior, JR and Bleicher, L and Nóbrega, FG and Barrientos, A and Barros, MH}, title = {Mitochondrial ribosome bL34 mutants present diminished translation of cytochrome c oxidase subunits.}, journal = {Cell biology international}, volume = {42}, number = {6}, pages = {630-642}, pmid = {29160602}, issn = {1095-8355}, support = {R35 GM118141/GM/NIGMS NIH HHS/United States ; }, mesh = {Amino Acid Sequence ; Electron Transport Complex IV/genetics/*metabolism ; Mitochondria/genetics/*metabolism ; Mitochondrial Proteins/genetics/metabolism ; Mitochondrial Ribosomes/*metabolism ; Mutagenesis, Site-Directed ; Protein Biosynthesis ; RGS Proteins/genetics/metabolism ; Saccharomyces cerevisiae/metabolism ; Saccharomyces cerevisiae Proteins/genetics/*metabolism ; Sequence Alignment ; }, abstract = {Saccharomyces cerevisiae mitoribosomes are specialized in the translation of a few number of highly hydrophobic membrane proteins, components of the oxidative phosphorylation system. Mitochondrial characteristics, such as the membrane system and its redox state driven mitoribosomes evolution through great diversion from their bacterial and cytosolic counterparts. Therefore, mitoribosome presents a considerable number of mitochondrial-specific proteins, as well as new protein extensions. In this work we characterize temperature sensitive mutants of the subunit bL34 present in the 54S large subunit. Although bL34 has bacterial homologs, in yeast it has a long 65 aminoacids mitochondrial N-terminal addressing sequence, here we demonstrate that it can be replaced by the mitochondrial addressing sequence of Neurospora crassa ATP9 gene. The bL34 temperature sensitive mutants present lowered translation of mitochondrial COX1 and COX3, which resulted in reduced cytochrome c oxidase activity and respiratory growth deficiency. The sedimentation properties of bL34 in sucrose gradients suggest that similarly to its bacterial homolog, bL34 is also a later participant in the process of mitoribosome biogenesis.}, }
@article {pmid29155472, year = {2018}, author = {Wang, D and Gu, J and David, R and Wang, Z and Yang, S and Searle, IR and Zhu, JK and Timmis, JN}, title = {Experimental reconstruction of double-stranded break repair-mediated plastid DNA insertion into the tobacco nucleus.}, journal = {The Plant journal : for cell and molecular biology}, volume = {93}, number = {2}, pages = {227-234}, doi = {10.1111/tpj.13769}, pmid = {29155472}, issn = {1365-313X}, mesh = {Cell Nucleus/genetics ; *DNA Breaks, Double-Stranded ; *DNA Repair ; DNA, Chloroplast/genetics ; Genome, Plant/*genetics ; Plastids/genetics ; Symbiosis ; Tobacco/*genetics ; }, abstract = {The mitochondria and plastids of eukaryotic cells evolved from endosymbiotic prokaryotes. DNA from the endosymbionts has bombarded nuclei since the ancestral prokaryotes were engulfed by a precursor of the nucleated eukaryotic host. An experimental confirmation regarding the molecular mechanisms responsible for organelle DNA incorporation into nuclei has not been performed until the present analysis. Here we introduced double-stranded DNA breaks into the nuclear genome of tobacco through inducible expression of I-SceI, and showed experimentally that tobacco chloroplast DNAs insert into nuclear genomes through double-stranded DNA break repair. Microhomology-mediated linking of disparate segments of chloroplast DNA occurs frequently during healing of induced nuclear double-stranded breaks (DSB) but the resulting nuclear integrants are often immediately unstable. Non-Mendelian inheritance of a selectable marker (neo), used to identify plastid DNA transfer, was observed in the progeny of about 50% of lines emerging from the screen. The instability of these de novo nuclear insertions of plastid DNA (nupts) was shown to be associated with deletion not only of the nupt itself but also of flanking nuclear DNA within one generation of transfer. This deletion of pre-existing nuclear DNA suggests that the genetic impact of organellar DNA transfer to the nucleus is potentially far greater than previously thought.}, }
@article {pmid29155008, year = {2018}, author = {McDonald, AE and Pichaud, N and Darveau, CA}, title = {&quot;Alternative&quot; fuels contributing to mitochondrial electron transport: Importance of non-classical pathways in the diversity of animal metabolism.}, journal = {Comparative biochemistry and physiology. Part B, Biochemistry &amp; molecular biology}, volume = {224}, number = {}, pages = {185-194}, doi = {10.1016/j.cbpb.2017.11.006}, pmid = {29155008}, issn = {1879-1107}, mesh = {Animals ; Citric Acid Cycle/*physiology ; Electron Transport/physiology ; Glycolysis/*physiology ; Humans ; Mitochondria/*physiology ; *Oxidative Phosphorylation ; }, abstract = {The study of glycolysis, the TCA cycle, and oxidative phosphorylation in animals has yielded a wealth of information about bioenergetics. Less is known about how animals use fuels other than glucose and less characterized enzymes that are also used to provide electrons to the electron transport system. It has become clear that bioenergetic flexibility is employed by a wide variety of animals in order to successfully grow, maintain cells, and reproduce, and has contributed to the exploitation of new environments and ecological niches through evolution. In most cases, the discovery of these &quot;alternative&quot; fuels and non-classical pathways is relatively recent, but is starting to call into question long believed paradigms about the diversity of animal bioenergetics. We present several specific examples of these &quot;alternatives&quot; and the animals that use them and present some implications for animal mitochondrial physiology research.}, }
@article {pmid29154412, year = {2018}, author = {Shaw, RE and Banks, SC and Peakall, R}, title = {The impact of mating systems and dispersal on fine-scale genetic structure at maternally, paternally and biparentally inherited markers.}, journal = {Molecular ecology}, volume = {27}, number = {1}, pages = {66-82}, doi = {10.1111/mec.14433}, pmid = {29154412}, issn = {1365-294X}, mesh = {Animal Migration ; Animals ; DNA, Mitochondrial/genetics ; Female ; Genetic Markers ; Inheritance Patterns/*genetics ; Male ; Mammals/*genetics ; *Sexual Behavior, Animal ; Y Chromosome/genetics ; }, abstract = {For decades, studies have focused on how dispersal and mating systems influence genetic structure across populations or social groups. However, we still lack a thorough understanding of how these processes and their interaction shape spatial genetic patterns over a finer scale (tens-hundreds of metres). Using uniparentally inherited markers may help answer these questions, yet their potential has not been fully explored. Here, we use individual-level simulations to investigate the effects of dispersal and mating system on fine-scale genetic structure at autosomal, mitochondrial and Y chromosome markers. Using genetic spatial autocorrelation analysis, we found that dispersal was the major driver of fine-scale genetic structure across maternally, paternally and biparentally inherited markers. However, when dispersal was restricted (mean distance = 100 m), variation in mating behaviour created strong differences in the comparative level of structure detected at maternally and paternally inherited markers. Promiscuity reduced spatial genetic structure at Y chromosome loci (relative to monogamy), whereas structure increased under polygyny. In contrast, mitochondrial and autosomal markers were robust to differences in the specific mating system, although genetic structure increased across all markers when reproductive success was skewed towards fewer individuals. Comparing males and females at Y chromosome vs. mitochondrial markers, respectively, revealed that some mating systems can generate similar patterns to those expected under sex-biased dispersal. This demonstrates the need for caution when inferring ecological and behavioural processes from genetic results. Comparing patterns between the sexes, across a range of marker types, may help us tease apart the processes shaping fine-scale genetic structure.}, }
@article {pmid29149282, year = {2017}, author = {Skibinski, DOF and Ghiselli, F and Diz, AP and Milani, L and Mullins, JGL}, title = {Structure-Related Differences between Cytochrome Oxidase I Proteins in a Stable Heteroplasmic Mitochondrial System.}, journal = {Genome biology and evolution}, volume = {9}, number = {12}, pages = {3265-3281}, pmid = {29149282}, issn = {1759-6653}, mesh = {Adenosine Triphosphate/metabolism ; Amino Acid Substitution ; Animals ; Bivalvia/cytology/enzymology/*genetics ; DNA, Mitochondrial/genetics ; Electron Transport Complex IV/*chemistry/classification/genetics ; *Evolution, Molecular ; Female ; Inheritance Patterns ; Male ; Membrane Potential, Mitochondrial ; Mitochondria/genetics ; Phylogeny ; Protein Conformation ; Protein Structure, Secondary ; Protein Subunits ; Sequence Analysis, DNA ; }, abstract = {Many bivalve species have two types of mitochondrial DNA passed independently through the female line (F genome) and male line (M genome). Here we study the cytochrome oxidase I protein in such bivalve species and provide evidence for differences between the F and M proteins in amino acid property values, particularly relating to hydrophobicity and helicity. The magnitude of these differences varies between different regions of the protein and the change from the ancestor is most marked in the M protein. The observed changes occur in parallel and in the same direction in the different species studied. Two possible causes are considered, first relaxation of purifying selection with drift and second positive selection. These may operate in different ways in different regions of the protein. Many different amino acid substitutions contribute in a small way to the observed variation, but substitutions involving alanine and serine have a quantitatively large effect. Some of these substitutions are potential targets for phosphorylation and some are close to residues of functional importance in the catalytic mechanism. We propose that the observed changes in the F and M proteins might contribute to functional differences between them relating to ATP production and mitochondrial membrane potential with implications for sperm function.}, }
@article {pmid29145028, year = {2018}, author = {Sun, S and Hui, M and Wang, M and Sha, Z}, title = {The complete mitochondrial genome of the alvinocaridid shrimp Shinkaicaris leurokolos (Decapoda, Caridea): Insight into the mitochondrial genetic basis of deep-sea hydrothermal vent adaptation in the shrimp.}, journal = {Comparative biochemistry and physiology. Part D, Genomics &amp; proteomics}, volume = {25}, number = {}, pages = {42-52}, doi = {10.1016/j.cbd.2017.11.002}, pmid = {29145028}, issn = {1878-0407}, mesh = {Adaptation, Physiological/*genetics ; Animals ; Arthropod Proteins/*genetics ; Base Sequence ; Conserved Sequence ; Decapoda (Crustacea)/*genetics/physiology ; *Genome, Mitochondrial ; *Hydrothermal Vents ; Open Reading Frames ; Phylogeny ; RNA, Ribosomal/genetics ; RNA, Transfer/genetics ; Sequence Homology, Nucleic Acid ; }, abstract = {Deep-sea hydrothermal vent is one of the most extreme environments on Earth with low oxygen and high levels of toxins. Decapod species from the family Alvinocarididae have colonized and successfully adapted to this extremely harsh environment. Mitochondria plays a vital role in oxygen usage and energy metabolism, thus it may be under selection in the adaptive evolution of the hydrothermal vent shrimps. In this study, the mitochondrial genome (mitogenome) of alvinocaridid shrimp Shinkaicaris leurokolos (Kikuchi &amp; Hashimoto, 2000) was determined through Illumina sequencing. The mitogenome of S. leurokolos was 15,903bp in length, containing 13 protein-coding genes, 2 rRNAs, and 22 tRNAs. The gene order and orientation were identical to those of sequenced alvinocaridids. It has the longest concatenated sequences of protein-coding genes, tRNAs and shortest pooled rRNAs among the alvinocaridids. The control regions (CRs) of alvinocaridid were significantly longer (p<0.01) than those of the other caridaen. The alignment of the alvinocaridid CRs revealed two conserved sequence blocks (CSBs), and each of the CSBs included a noncanonical open reading frame (ORF), which may be involved in adjusting mitochondrial energy metabolism to adapt to the hydrothermal environment. Phylogenetic analysis supported that the deep-sea hydrothermal vent shrimps may have originated from those living in shallow area. Positive selection analysis reveals the evidence of adaptive change in the mitogenome of Alvinocarididae. Thirty potentially important adaptive residues were identified, which were located in atp6, cox1, cox3, cytb and nad1-5. This study explores the mitochondrial genetic basis of hydrothermal vent adaptation in alvinocaridid for the first time, and provides valuable clues regarding the adaptation.}, }
@article {pmid29141880, year = {2017}, author = {Lague, SL and Chua, B and Alza, L and Scott, GR and Frappell, PB and Zhong, Y and Farrell, AP and McCracken, KG and Wang, Y and Milsom, WK}, title = {Divergent respiratory and cardiovascular responses to hypoxia in bar-headed geese and Andean birds.}, journal = {The Journal of experimental biology}, volume = {220}, number = {Pt 22}, pages = {4186-4194}, doi = {10.1242/jeb.168799}, pmid = {29141880}, issn = {1477-9145}, mesh = {*Altitude ; Anaerobiosis ; Animal Migration ; Animals ; Biological Evolution ; Ducks/*physiology ; Female ; Geese/*physiology ; *Life History Traits ; Male ; *Oxygen Consumption ; Phylogeny ; *Respiration ; Species Specificity ; }, abstract = {Many high-altitude vertebrates have evolved increased capacities in their oxygen transport cascade (ventilation, pulmonary diffusion, circulation and tissue diffusion), enhancing oxygen transfer from the atmosphere to mitochondria. However, the extent of interspecies variation in the control processes that dictate hypoxia responses remains largely unknown. We compared the metabolic, cardiovascular and respiratory responses to progressive decreases in inspired oxygen levels of bar-headed geese (Anser indicus), birds that biannually migrate across the Himalayan mountains, with those of Andean geese (Chloephaga melanoptera) and crested ducks (Lophonetta specularioides), lifelong residents of the high Andes. We show that Andean geese and crested ducks have evolved fundamentally different mechanisms for maintaining oxygen supply during low oxygen (hypoxia) from those of bar-headed geese. Bar-headed geese respond to hypoxia with robust increases in ventilation and heart rate, whereas Andean species increase lung oxygen extraction and cardiac stroke volume. We propose that transient high-altitude performance has favoured the evolution of robust convective oxygen transport recruitment in hypoxia, whereas life-long high-altitude residency has favoured the evolution of structural enhancements to the lungs and heart that increase lung diffusion and stroke volume.}, }
@article {pmid29141015, year = {2017}, author = {Bozler, J and Kacsoh, BZ and Bosco, G}, title = {Nematocytes: Discovery and characterization of a novel anculeate hemocyte in Drosophila falleni and Drosophila phalerata.}, journal = {PloS one}, volume = {12}, number = {11}, pages = {e0188133}, pmid = {29141015}, issn = {1932-6203}, support = {DP1 MH110234/MH/NIMH NIH HHS/United States ; P30 CA023108/CA/NCI NIH HHS/United States ; }, mesh = {Animals ; Drosophila/*classification/immunology ; *Hemocytes ; Immunity, Innate ; Microscopy, Fluorescence ; Phylogeny ; Species Specificity ; }, abstract = {Immune challenges, such as parasitism, can be so pervasive and deleterious that they constitute an existential threat to a species' survival. In response to these ecological pressures, organisms have developed a wide array of novel behavioral, cellular, and molecular adaptations. Research into these immune defenses in model systems has resulted in a revolutionary understanding of evolution and functional biology. As the field has expanded beyond the limited number of model organisms our appreciation of evolutionary innovation and unique biology has widened as well. With this in mind, we have surveyed the hemolymph of several non-model species of Drosophila. Here we identify and describe a novel hemocyte, type-II nematocytes, found in larval stages of numerous Drosophila species. Examined in detail in Drosophila falleni and Drosophila phalerata, we find that these remarkable cells are distinct from previously described hemocytes due to their anucleate state (lacking a nucleus) and unusual morphology. Type-II nematocytes are long, narrow cells with spindle-like projections extending from a cell body with high densities of mitochondria and microtubules, and exhibit the ability to synthesize proteins. These properties are unexpected for enucleated cells, and together with our additional characterization, we demonstrate that these type-II nematocytes represent a biological novelty. Surprisingly, despite the absence of a nucleus, we observe through live cell imaging that these cells remain motile with a highly dynamic cellular shape. Furthermore, these cells demonstrate the ability to form multicellular structures, which we suggest may be a component of the innate immune response to macro-parasites. In addition, live cell imaging points to a large nucleated hemocyte, type-I nematocyte, as the progenitor cell, leading to enucleation through a budding or asymmetrical division process rather than nuclear ejection: This study is the first to report such a process of enucleation. Here we describe these cells in detail for the first time and examine their evolutionary history in Drosophila.}, }
@article {pmid29138502, year = {2017}, author = {Pannek, M and Simic, Z and Fuszard, M and Meleshin, M and Rotili, D and Mai, A and Schutkowski, M and Steegborn, C}, title = {Crystal structures of the mitochondrial deacylase Sirtuin 4 reveal isoform-specific acyl recognition and regulation features.}, journal = {Nature communications}, volume = {8}, number = {1}, pages = {1513}, pmid = {29138502}, issn = {2041-1723}, mesh = {Acylation ; Amino Acid Sequence ; Animals ; Crystallography, X-Ray ; Humans ; Isoenzymes/chemistry/genetics/metabolism ; Lysine/*chemistry/genetics/metabolism ; Mitochondrial Proteins/*chemistry/genetics/metabolism ; Models, Molecular ; Phylogeny ; Protein Conformation ; Sequence Homology, Amino Acid ; Sirtuins/*chemistry/genetics/metabolism ; Xenopus ; Xenopus Proteins/*chemistry/genetics/metabolism ; }, abstract = {Sirtuins are evolutionary conserved NAD+-dependent protein lysine deacylases. The seven human isoforms, Sirt1-7, regulate metabolism and stress responses and are considered therapeutic targets for aging-related diseases. Sirt4 locates to mitochondria and regulates fatty acid metabolism and apoptosis. In contrast to the mitochondrial deacetylase Sirt3 and desuccinylase Sirt5, no prominent deacylase activity and structural information are available for Sirt4. Here we describe acyl substrates and crystal structures for Sirt4. The enzyme shows isoform-specific acyl selectivity, with significant activity against hydroxymethylglutarylation. Crystal structures of Sirt4 from Xenopus tropicalis reveal a particular acyl binding site with an additional access channel, rationalizing its activities. The structures further identify a conserved, isoform-specific Sirt4 loop that folds into the active site to potentially regulate catalysis. Using these results, we further establish efficient Sirt4 activity assays, an unusual Sirt4 regulation by NADH, and Sirt4 effects of pharmacological modulators.}, }
@article {pmid29137980, year = {2018}, author = {El Haddad, S and Serrano, A and Normand, T and Robin, C and Dubois, M and Brulé-Morabito, F and Mollet, L and Charpentier, S and Legrand, A}, title = {Interaction of Alpha-synuclein with Cytogaligin, a protein encoded by the proapoptotic gene GALIG.}, journal = {Biochemical and biophysical research communications}, volume = {495}, number = {1}, pages = {787-792}, doi = {10.1016/j.bbrc.2017.11.078}, pmid = {29137980}, issn = {1090-2104}, mesh = {Apoptosis ; Apoptosis Regulatory Proteins ; Blood Proteins/*metabolism ; Extracellular Fluid/*metabolism ; Galectins/*metabolism ; HeLa Cells ; Humans ; Protein Binding ; Protein Interaction Mapping ; Subcellular Fractions/*metabolism ; alpha-Synuclein/*metabolism ; }, abstract = {GALIG, an internal gene to the human galectin-3 gene, encodes two distinct proteins, Mitogaligin and Cytogaligin through translation of a unique mRNA in two overlapping alternative reading frames. When overexpressed GALIG induces apoptosis. In cultured cells, Mitogaligin destabilizes mitochondria membranes through interaction with cardiolipin. Little is known regarding the role of Cytogaligin. This protein displays multiple subcellular localizations; cytosol, nucleus, and mitochondria. We illustrate here that Cytogaligin is also secreted in the extracellular medium. Cytogaligin is shown to interact with α-Synuclein, the major component of Lewy bodies in Parkinson's disease. Overexpression of Cytogaligin reduces α-Synuclein dimerization raising a possible role in the evolution of α-Synuclein aggregation, a key molecular event underlying the pathogenesis of Parkinson's disease.}, }
@article {pmid29137957, year = {2018}, author = {Saunders, GW and Jackson, C and Salomaki, ED}, title = {Phylogenetic analyses of transcriptome data resolve familial assignments for genera of the red-algal Acrochaetiales-Palmariales Complex (Nemaliophycidae).}, journal = {Molecular phylogenetics and evolution}, volume = {119}, number = {}, pages = {151-159}, doi = {10.1016/j.ympev.2017.11.002}, pmid = {29137957}, issn = {1095-9513}, mesh = {Base Sequence ; DNA Barcoding, Taxonomic ; DNA, Intergenic/genetics ; Likelihood Functions ; Mitochondria/genetics ; *Phylogeny ; Rhodophyta/*classification/*genetics ; Transcriptome/*genetics ; }, abstract = {Phylogenetic analyses of transcriptome data for representatives of the red algal Acrochaetiales-Palmariales Complex provided robust support for the assignment of genera to the constituent families. In the Acrochaetiales, the genera Acrochaetium, Grania, and an unnamed genus-level lineage (Acrochaetiac sp._1Aus) were assigned to the Acrochaetiaceae, while Audouinella is placed in a resurrected Audouinellaceae and Rhodochorton and Rhododrewia constitute the resurrected Rhodochortonaceae. For the Palmariales, transcriptome data solidly support the inclusion of Camontagnea and Rhodothamniella in the Rhodothamniellaceae, Meiodiscus and Rubrointrusa in the Meiodiscaceae, Rhodonematella and Rhodophysema in the Rhodophysemataceae, while Devaleraea and Palmaria remained in the Palmariaceae. These analyses, however, questioned the monophyly of Palmaria, which prompted a second round of analyses using eight common red algal phylogenetic markers and including a broader sampling of red algal genera in our analyses. These results supported transfer of Palmaria callophylloides and P. mollis to the genus Devaleraea necessitating new combinations, and further added the genus Halosaccion to the Palmariaceae and the genera Kallymenicola and Rhodophysemopsis to the Meiodiscaceae. Finally, DNA barcode (mitochondrial COI-5P) and ITS data were explored and supported the continued recognition of Palmaria palmata as a single species in the North Atlantic.}, }
@article {pmid29129605, year = {2018}, author = {Pogozheva, ID and Lomize, AL}, title = {Evolution and adaptation of single-pass transmembrane proteins.}, journal = {Biochimica et biophysica acta. Biomembranes}, volume = {1860}, number = {2}, pages = {364-377}, doi = {10.1016/j.bbamem.2017.11.002}, pmid = {29129605}, issn = {0005-2736}, mesh = {*Adaptation, Physiological ; Arabidopsis/genetics/metabolism ; Cell Membrane/*metabolism ; Databases, Protein ; Dictyostelium/genetics/metabolism ; Escherichia coli/genetics/metabolism ; *Evolution, Molecular ; Humans ; Membrane Proteins/chemistry/genetics/*metabolism ; Methanocaldococcus/genetics/metabolism ; Protein Conformation, alpha-Helical ; Protein Multimerization ; Proteome/chemistry/genetics/metabolism ; Saccharomyces cerevisiae/genetics/metabolism ; Species Specificity ; }, abstract = {A comparative analysis of 6039 single-pass (bitopic) membrane proteins from six evolutionarily distant organisms was performed based on data from the Membranome database. The observed repertoire of bitopic proteins is significantly enlarged in eukaryotic cells and especially in multicellular organisms due to the diversification of enzymes, emergence of proteins involved in vesicular trafficking, and expansion of receptors, structural, and adhesion proteins. The majority of bitopic proteins in multicellular organisms are located in the plasma membrane (PM) and involved in cell communication. Bitopic proteins from different membranes significantly diverge in terms of their biological functions, size, topology, domain architecture, physical properties of transmembrane (TM) helices and propensity to form homodimers. Most proteins from eukaryotic PM and endoplasmic reticulum (ER) have the N-out topology. The predicted lengths of TM helices and hydrophobic thicknesses, stabilities and hydrophobicities of TM α-helices are the highest for proteins from eukaryotic PM, intermediate for proteins from prokaryotic cells, ER and Golgi apparatus, and lowest for proteins from mitochondria, chloroplasts, and peroxisomes. Tyr and Phe residues accumulate at the cytoplasmic leaflet of PM and at the outer leaflet of membranes of bacteria, Golgi apparatus, and nucleus. The propensity for dimerization increases from unicellular to multicellular eukaryotes, from enzymes to receptors, and from intracellular membrane proteins to PM proteins. More than half of PM proteins form homodimers with a 2:1 ratio of right-handed to left-handed helix packing arrangements. The inverse ratio (1:2) was observed for dimers from the ER, Golgi and vesicles.}, }
@article {pmid29129532, year = {2017}, author = {Campbell, MA and Łukasik, P and Simon, C and McCutcheon, JP}, title = {Idiosyncratic Genome Degradation in a Bacterial Endosymbiont of Periodical Cicadas.}, journal = {Current biology : CB}, volume = {27}, number = {22}, pages = {3568-3575.e3}, doi = {10.1016/j.cub.2017.10.008}, pmid = {29129532}, issn = {1879-0445}, mesh = {Animals ; Bacteria/genetics ; Biological Evolution ; DNA, Circular/genetics ; Genome, Bacterial ; Genomics ; Hemiptera/*genetics/*microbiology ; Phylogeny ; Sequence Analysis, DNA/methods ; Symbiosis/*genetics ; }, abstract = {When a free-living bacterium transitions to a host-beneficial endosymbiotic lifestyle, it almost invariably loses a large fraction of its genome [1, 2]. The resulting small genomes often become stable in size, structure, and coding capacity [3-5], as exemplified by Sulcia muelleri, a nutritional endosymbiont of cicadas. Sulcia's partner endosymbiont, Hodgkinia cicadicola, similarly remains co-linear in some cicadas diverged by millions of years [6, 7]. But in the long-lived periodical cicada Magicicada tredecim, the Hodgkinia genome has split into dozens of tiny, gene-sparse circles that sometimes reside in distinct Hodgkinia cells [8]. Previous data suggested that all other Magicicada species harbor complex Hodgkinia populations, but the timing, number of origins, and outcomes of the splitting process were unknown. Here, by sequencing Hodgkinia metagenomes from the remaining six Magicicada and two sister species, we show that each Magicicada species harbors Hodgkinia populations of at least 20 genomic circles. We find little synteny among the 256 Hodgkinia circles analyzed except between the most closely related cicada species. Gene phylogenies show multiple Hodgkinia lineages in the common ancestor of Magicicada and its closest known relatives but that most splitting has occurred within Magicicada and has given rise to highly variable Hodgkinia gene dosages among species. These data show that Hodgkinia genome degradation has proceeded down different paths in different Magicicada species and support a model of genomic degradation that is stochastic in outcome and nonadaptive for the host. These patterns mirror the genomic instability seen in some mitochondria.}, }
@article {pmid29126122, year = {2018}, author = {Pacheco, MA and Matta, NE and Valkiunas, G and Parker, PG and Mello, B and Stanley, CE and Lentino, M and Garcia-Amado, MA and Cranfield, M and Kosakovsky Pond, SL and Escalante, AA}, title = {Mode and Rate of Evolution of Haemosporidian Mitochondrial Genomes: Timing the Radiation of Avian Parasites.}, journal = {Molecular biology and evolution}, volume = {35}, number = {2}, pages = {383-403}, pmid = {29126122}, issn = {1537-1719}, support = {R01 GM080586/GM/NIGMS NIH HHS/United States ; R01 GM093939/GM/NIGMS NIH HHS/United States ; }, mesh = {*Biological Evolution ; *Genome, Mitochondrial ; *Genome, Protozoan ; Haemosporida/*genetics ; Selection, Genetic ; }, abstract = {Haemosporidians are a diverse group of vector-borne parasitic protozoa that includes the agents of human malaria; however, most of the described species are found in birds and reptiles. Although our understanding of these parasites' diversity has expanded by analyses of their mitochondrial genes, there is limited information on these genes' evolutionary rates. Here, 114 mitochondrial genomes (mtDNA) were studied from species belonging to four genera: Leucocytozoon, Haemoproteus, Hepatocystis, and Plasmodium. Contrary to previous assertions, the mtDNA is phylogenetically informative. The inferred phylogeny showed that, like the genus Plasmodium, the Leucocytozoon and Haemoproteus genera are not monophyletic groups. Although sensitive to the assumptions of the molecular dating method used, the estimated times indicate that the diversification of the avian haemosporidian subgenera/genera took place after the Cretaceous-Paleogene boundary following the radiation of modern birds. Furthermore, parasite clade differences in mtDNA substitution rates and strength of negative selection were detected. These differences may affect the biological interpretation of mtDNA gene lineages used as a proxy to species in ecological and parasitological investigations. Given that the mitochondria are critically important in the parasite life cycle stages that take place in the vector and that the transmission of parasites belonging to particular clades has been linked to specific insect families/subfamilies, this study suggests that differences in vectors have affected the mode of evolution of haemosporidian mtDNA genes. The observed patterns also suggest that the radiation of haemosporidian parasites may be the result of community-level evolutionary processes between their vertebrate and invertebrate hosts.}, }
@article {pmid29123225, year = {2017}, author = {Eme, L and Spang, A and Lombard, J and Stairs, CW and Ettema, TJG}, title = {Archaea and the origin of eukaryotes.}, journal = {Nature reviews. Microbiology}, volume = {15}, number = {12}, pages = {711-723}, pmid = {29123225}, issn = {1740-1534}, mesh = {Archaea/*genetics ; *Biological Evolution ; Eukaryota/*genetics ; Pharmacogenomic Variants ; }, abstract = {Woese and Fox's 1977 paper on the discovery of the Archaea triggered a revolution in the field of evolutionary biology by showing that life was divided into not only prokaryotes and eukaryotes. Rather, they revealed that prokaryotes comprise two distinct types of organisms, the Bacteria and the Archaea. In subsequent years, molecular phylogenetic analyses indicated that eukaryotes and the Archaea represent sister groups in the tree of life. During the genomic era, it became evident that eukaryotic cells possess a mixture of archaeal and bacterial features in addition to eukaryotic-specific features. Although it has been generally accepted for some time that mitochondria descend from endosymbiotic alphaproteobacteria, the precise evolutionary relationship between eukaryotes and archaea has continued to be a subject of debate. In this Review, we outline a brief history of the changing shape of the tree of life and examine how the recent discovery of a myriad of diverse archaeal lineages has changed our understanding of the evolutionary relationships between the three domains of life and the origin of eukaryotes. Furthermore, we revisit central questions regarding the process of eukaryogenesis and discuss what can currently be inferred about the evolutionary transition from the first to the last eukaryotic common ancestor.}, }
@article {pmid29122550, year = {2018}, author = {VandenBrooks, JM and Gstrein, G and Harmon, J and Friedman, J and Olsen, M and Ward, A and Parker, G}, title = {Supply and demand: How does variation in atmospheric oxygen during development affect insect tracheal and mitochondrial networks?.}, journal = {Journal of insect physiology}, volume = {106}, number = {Pt 3}, pages = {217-223}, doi = {10.1016/j.jinsphys.2017.11.001}, pmid = {29122550}, issn = {1879-1611}, abstract = {Atmospheric oxygen is one of the most important atmospheric component for all terrestrial organisms. Variation in atmospheric oxygen has wide ranging effects on animal physiology, development, and evolution. This variation in oxygen has the potential to affect both respiratory systems (the supply side) and mitochondrial networks (the demand side) in animals. Insect respiratory systems supplying oxygen to tissues in the gas phase through blind ended tracheal systems are particularly susceptible to this variation. While the large conducting tracheae have previously been shown to respond developmentally to changes in rearing oxygen, the effect of oxygen on the tracheolar network has been relatively unexplored, especially in adult insects. Similarly, mitochondrial networks that meet energy demand in insects and other animals are dynamic and their enzyme activities have been shown to vary in the presence of oxygen. These two systems together should be under selective pressure to meet the aerobic metabolic requirements of insects. To test this hypothesis, we reared Mito-YFP Drosophila under three different oxygen concentrations hypoxia (12%), normoxia (21%), and hyperoxia (31%) and imaged their tracheolar and mitochondrial networks within their flight muscle using confocal microscopy. In terms of oxygen supply, hypoxia increased mean (mid-length) tracheolar diameters, tracheolar tip diameters, the number of tracheoles per main branch and affected tracheal branching patterns, while the opposite was observed in hyperoxia. In terms of oxygen demand, hypoxia increased mitochondrial investment and mitochondrial to tracheolar volume ratios; while the opposite was observed in hyperoxia. Generally, hypoxia had a stronger effect on both systems than hyperoxia. These results show that insects are capable of developmentally changing investment in both their supply and demand networks to increase overall fitness.}, }
@article {pmid29117860, year = {2017}, author = {Peleh, V and Zannini, F and Backes, S and Rouhier, N and Herrmann, JM}, title = {Erv1 of Arabidopsis thaliana can directly oxidize mitochondrial intermembrane space proteins in the absence of redox-active Mia40.}, journal = {BMC biology}, volume = {15}, number = {1}, pages = {106}, pmid = {29117860}, issn = {1741-7007}, mesh = {Arabidopsis/*genetics/metabolism ; Arabidopsis Proteins/*genetics/metabolism ; Mitochondrial Membrane Transport Proteins/*genetics/metabolism ; Mitochondrial Proteins/genetics/*metabolism ; Oxidation-Reduction ; Saccharomyces cerevisiae/*genetics/metabolism ; Saccharomyces cerevisiae Proteins/*genetics/metabolism ; }, abstract = {BACKGROUND: Many proteins of the mitochondrial intermembrane space (IMS) contain structural disulfide bonds formed by the mitochondrial disulfide relay. In fungi and animals, the sulfhydryl oxidase Erv1 'generates' disulfide bonds that are passed on to the oxidoreductase Mia40, which oxidizes substrate proteins. A different structural organization of plant Erv1 proteins compared to that of animal and fungal orthologs was proposed to explain its inability to complement the corresponding yeast mutant.<br><br>RESULTS: Herein, we have revisited the biochemical and functional properties of Arabidopsis thaliana Erv1 by both in vitro reconstituted activity assays and complementation of erv1 and mia40 yeast mutants. These mutants were viable, however, they showed severe defects in the biogenesis of IMS proteins. The plant Erv1 was unable to oxidize yeast Mia40 and rather even blocked its activity. Nevertheless, it was able to mediate the import and folding of mitochondrial proteins.<br><br>CONCLUSIONS: We observed that plant Erv1, unlike its homologs in fungi and animals, can promote protein import and oxidative protein folding in the IMS independently of the oxidoreductase Mia40. In accordance to the absence of Mia40 in many protists, our study suggests that the mitochondrial disulfide relay evolved in a stepwise reaction from an Erv1-only system to which Mia40 was added in order to improve substrate specificity. Graphical Abstract The mitochondrial disulfide relay evolved in a step-wise manner from an Erv1-only system.}, }
@article {pmid29117562, year = {2017}, author = {Redrejo-Rodríguez, M and Ordóñez, CD and Berjón-Otero, M and Moreno-González, J and Aparicio-Ma