International Microbiology, Vol 2, No 1 (1999)

Accelerated evolution in bacterial endosymbionts of aphids

Célia Buades, José Manuel Michelena, Amparo Latorre, Andrés Moya


When compared with free living bacteria, it is proposed that there are at least two endosymbiotic processes in aphids based on the A + T content as well as the increased evolutionary rate of the b-subunit of the F-ATPase complex in different endosymbiotic bacteria. The first well established process corresponds to the integration of Buchnera aphidicola more than 150 million years ago. The other is postulated to correspond to new endosymbiotic processes in which the bacteria involved contain less A + T and show a lower increase of evolutionary rates when compared with B. aphidicola. It is proposed, therefore, that endosymbioses are active processes in aphid evolution.

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