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MBE Advance Access originally published online on March 10, 2004
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Mol. Biol. Evol. 21(6):1110-1122. 2004
DOI: 10.1093/molbev/msh122
© 2004 by the Society for Molecular Biology and Evolution. ISSN: 0737-4038

A Phylogenomic Study of Endosymbiotic Bacteria

Björn Canbäck1, Ivica Tamas2 and Siv G. E. Andersson

Department of Molecular Evolution, Evolutionary Biology Center, University of Uppsala, Uppsala, Sweden

E-mail: Siv.Andersson{at}ebc.uu.se.

Endosymbiotic bacteria of aphids, Buchnera aphidicola, and tsetse flies, Wigglesworthia glossinidia, are descendents of free-living {gamma}-Proteobacteria. The acceleration of sequence evolution in the endosymbiont genomes is here estimated from a phylogenomic analysis of the {gamma}-Proteobacteria. The tree topologies associated with the most highly conserved genes suggest that the endosymbionts form a sister group with Escherichia coli, Salmonella sp., and Yersinia pestis. Our results indicate that deviant tree topologies result from high substitution rates and biased nucleotide patterns, rather than from lateral gene transfer, as previously suggested. A reinvestigation of the relative rate increase in the endosymbiont genomes reveals variability among genes that correlate with host-associated metabolic dependencies. The conclusion is that host-level selection has retarded both the loss of genes and the acceleration of sequence evolution in endocellular symbionts.

Key Words: endosymbionts • phylogeny • substitution rate


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