Gene Duplications Trace Mitochondria to the Onset of Eukaryote Complexity
| Autor: | Fernando D. K. Tria, Sven B. Gould, Nils Kapust, Josip Skejo, Michael Knopp, Verena Zimorski, Jessica L. E. Wimmer, Sriram G. Garg, Falk S. P. Nagies, Julia Brueckner, William Martin, Joana C. Xavier |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
AcademicSubjects/SCI01140 Gene Transfer Horizontal Lineage (evolution) Biology 010603 evolutionary biology 01 natural sciences Genome Genes Archaeal Evolution Molecular 03 medical and health sciences Gene duplication evolution Genetics Plastid gene transfer Gene paralogy Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences endosymbiosis Endosymbiosis AcademicSubjects/SCI01130 gene duplication Eukaryota biology.organism_classification Biological Evolution eukaryote origin Mitochondria evolution paralogy gene transfer endosymbiosis gene duplication eukaryote origin Genes Bacterial Horizontal gene transfer Eukaryote Research Article |
| Zdroj: | Genome Biology and Evolution |
| ISSN: | 1759-6653 |
| Popis: | The last eukaryote common ancestor (LECA) possessed mitochondria and all key traits that make eukaryotic cells more complex than their prokaryotic ancestors, yet the timing of mitochondrial acquisition and the role of mitochondria in the origin of eukaryote complexity remain debated. Here, we report evidence from gene duplications in LECA indicating an early origin of mitochondria. Among 163,545 duplications in 24,571 gene trees spanning 150 sequenced eukaryotic genomes, we identify 713 gene duplication events that occurred in LECA. LECA’s bacterial-derived genes include numerous mitochondrial functions and were duplicated significantly more often than archaeal-derived and eukaryote-specific genes. The surplus of bacterial-derived duplications in LECA most likely reflects the serial copying of genes from the mitochondrial endosymbiont to the archaeal host’s chromosomes. Clustering, phylogenies and likelihood ratio tests for 22.4 million genes from 5,655 prokaryotic and 150 eukaryotic genomes reveal no evidence for lineage-specific gene acquisitions in eukaryotes, except from the plastid in the plant lineage. That finding, and the functions of bacterial genes duplicated in LECA, suggests that the bacterial genes in eukaryotes are acquisitions from the mitochondrion, followed by vertical gene evolution and differential loss across eukaryotic lineages, flanked by concomitant lateral gene transfer among prokaryotes. Overall, the data indicate that recurrent gene transfer via the copying of genes from a resident mitochondrial endosymbiont to archaeal host chromosomes preceded the onset of eukaryotic cellular complexity, favoring mitochondria-early over mitochondria-late hypotheses for eukaryote origin. |
| Databáze: | OpenAIRE |
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