The origin of mitochondria in light of a fluid prokaryotic chromosome model

被引：76

作者：

Esser, Christian ^{[1
]}

Martin, William ^{[1
]}

Dagan, Tal ^{[1
]}

机构：

[1] Univ Dusseldorf, Inst Bot 3, D-40225 Dusseldorf, Germany

来源：

BIOLOGY LETTERS | 2007年 / 3卷 / 02期

关键词：

genomics; hydrogenosomes; lateral gene transfer; microbial evolution; endosymbiosis; Magnetococcus;

D O I：

10.1098/rsbl.2006.0582

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Biologists agree that the ancestor of mitochondria was an alpha-proteobacterium. But there is no consensus as to what constitutes an alpha-proteobacterial gene. Is it a gene found in all or several alpha-proteobacteria, or in only one? Here, we examine the proportion of a-proteobacterial genes in alpha-proteobacterial genomes by means of sequence comparisons. We find that each a-proteobacterium harbours a particular collection of genes and that, depending upon the lineage examined, between 97 and 33% are alpha-proteobacterial by the nearest-neighbour criterion. Our findings bear upon attempts to reconstruct the mitochondrial ancestor and upon inferences concerning the collection of genes that the mitochondrial ancestor possessed at the time that it became an endosymbiont.

引用

页码：180 / 184

页数：5

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