Journal
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE III-SCIENCES DE LA VIE-LIFE SCIENCES
Volume 324, Issue 5, Pages 489-494Publisher
EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/S0764-4469(01)01328-2
Keywords
Buchnera; molecular phylogeny; GC content; evolutionary rate; intracellular symbiosis; insect
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Insect intracellular symbiotic bacteria (intracellular endosymbionts, or endocytobionts) were positioned within the gamma3-Proteobacteria using a non-homogeneous model of DNA evolution, allowing for rate variability among sites, for GC content heterogeneity among sequences, and applied to a maximum likelihood framework. Most of them were found to be closely related within the Enterobacteriaceae family, located between Proteus and Yersinia. These results suggest that such a bacterial group might possess several traits allowing for insect infection and the stable establishment of symbiotic relationships and that this could represent a stem clade for numerous insect endocytobionts. Based on the estimations of the equilibrium GC content and branch lengths in the phylogenetic tree, we have made comparisons of the relative ages of these different symbioses. (C) 2001 Academie des sciences/Editions scientifiques et medicales Elsevier SAS.
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