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Mitochondrial genomes revisited: why do different lineages retain different genes?


ABSTRACT: The mitochondria contain their own genome derived from an alphaproteobacterial endosymbiont. From thousands of protein-coding genes originally encoded by their ancestor, only between 1 and about 70 are encoded on extant mitochondrial genomes (mitogenomes). Thanks to a dramatically increasing number of sequenced and annotated mitogenomes a coherent picture of why some genes were lost, or relocated to the nucleus, is emerging. In this review, we describe the characteristics of mitochondria-to-nucleus gene transfer and the resulting varied content of mitogenomes across eukaryotes. We introduce a 'burst-upon-drift' model to best explain nuclear-mitochondrial population genetics with flares of transfer due to genetic drift.

SUBMITTER: Butenko A 

PROVIDER: S-EPMC10809612 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature

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Mitochondrial genomes revisited: why do different lineages retain different genes?

Butenko Anzhelika A   Lukeš Julius J   Speijer Dave D   Wideman Jeremy G JG  

BMC biology 20240125 1


The mitochondria contain their own genome derived from an alphaproteobacterial endosymbiont. From thousands of protein-coding genes originally encoded by their ancestor, only between 1 and about 70 are encoded on extant mitochondrial genomes (mitogenomes). Thanks to a dramatically increasing number of sequenced and annotated mitogenomes a coherent picture of why some genes were lost, or relocated to the nucleus, is emerging. In this review, we describe the characteristics of mitochondria-to-nucl  ...[more]

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