Canonical Pattern of Mitochondrial Ancestry for Eukaryotic Genes

3 Canonical Pattern of Mitochondrial Ancestry for Eukaryotic Genes 

A sister relationship of the Rickettsiales group and mitochondria revealed in phylogenetic analysis of resident mitochondrial genes does not necessarily mean that their last common ancestor was an obligate endosymbiont. The order Rickettsiales comprises not only true rickettsiae, currently classified 

79 r Rickettsia prowazekii M21789 72 If Rickettsia rickettsii L36217 99 Rickettsia conorii NC 003103 100 

Pseudomonas aeruginosa S77424 Vibrio cholerae NP 232292 Haemophilus influenzae NP 438701 Escherichia coli AAC77103 Yersinia pestis N P 403999  

Bordetella pertussis U12277 I Raistonia solanacearum NP 518763] P Magnetococcus sp. ZP 00044819  

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In this chapter I present phylogenetic data which are consistent with an endosymbiotic origin of what subsequently became the nucleus. Subsequently means here that the nucleus, as well as other typically eukaryotic structures, emerged after the advent of aerobically respiring mitochondria. A concept of canonical pattern of mitochondrial ancestry for eukaryotic genes (Emelyanov 2001b, 2003b) will be shown to be crucial to the issue. 

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