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Mitochondria are not captive bacteria
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Structural Biology.
Lund Univ, Sect Microbial Ecol, Dept Biol, Lund, Sweden..
2017 (English)In: Journal of Theoretical Biology, ISSN 0022-5193, E-ISSN 1095-8541, Vol. 434, p. 88-98Article in journal (Refereed) Published
Abstract [en]

Lynn Sagan's conjecture (1967) that three of the fundamental organelles observed in eukaryote cells, specifically mitochondria, plastids and flagella were once free-living primitive (prokaryotic) cells was accepted after considerable opposition. Even though the idea was swiftly refuted for the specific case of origins of flagella in eukaryotes, the symbiosis model in general was accepted for decades as a realistic hypothesis to describe the endosymbiotic origins of eukaryotes. However, a systematic analysis of the origins of the mitochondrial proteome based on empirical genome evolution models now indicates that 97% of modern mitochondrial protein domains as well their homologues in bacteria and archaea were present in the universal common ancestor (UCA) of the modern tree of life (ToL). These protein domains are universal modular building blocks of modern genes and genomes, each of which is identified by a unique tertiary structure and a specific biochemical function as well as a characteristic sequence profile. Further, phylogeny reconstructed from genome-scale evolution models reveals that Eukaryotes and Akaryotes (archaea and bacteria) descend independently from UCA. That is to say, Eukaryotes and Akaryotes are both primordial lineages that evolved in parallel. Finally, there is no indication of massive inter-lineage exchange of coding sequences during the descent of the two lineages. Accordingly, we suggest that the evolution of the mitochondrial proteome was autogenic (endogenic) and not endosymbiotic (exogenic).

Place, publisher, year, edition, pages
2017. Vol. 434, p. 88-98
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:uu:diva-340894DOI: 10.1016/j.jtbi.2017.07.011ISI: 000413888500012PubMedID: 28754286OAI: oai:DiVA.org:uu-340894DiVA, id: diva2:1181010
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationAvailable from: 2018-02-07 Created: 2018-02-07 Last updated: 2018-02-07Bibliographically approved

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Harish, Ajith

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