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A phylogenomic study of endosymbiotic bacteria
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Molecular Evolution.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Molecular Evolution.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Molecular Evolution.
2004 (English)In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 21, no 6, p. 1110-1122Article in journal (Refereed) Published
Abstract [en]

Endosymbiotic bacteria of aphids, Buchnera aphidicola, and tsetse flies, Wigglesworthia glossinidia, are descendents of free-living γ-Proteobacteria. The acceleration of sequence evolution in the endosymbiont genomes is here estimated from a phylogenomic analysis of the γ-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.

Place, publisher, year, edition, pages
2004. Vol. 21, no 6, p. 1110-1122
National Category
Biological Sciences Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-70774OAI: oai:DiVA.org:uu-70774DiVA, id: diva2:98685
Available from: 2005-04-28 Created: 2005-04-28 Last updated: 2017-11-21Bibliographically approved

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10.1093/molbev/msh122

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Andersson, Siv

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