✦ LIBER ✦

Phylogeny of γ-proteobacteria: resolution of one branch of the universal tree?

✍ Scribed by James R. Brown; Craig Volker

Publisher: John Wiley and Sons
Year: 2004
Tongue: English
Weight: 250 KB
Volume: 26
Category: Article
ISSN: 0265-9247
DOI: 10.1002/bies.20030

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The reconstruction of bacterial evolutionary relationships has proven to be a daunting task because variable mutation rates and horizontal gene transfer (HGT) among species can cause grave incongruities between phylogenetic trees based on single genes. Recently, a highly robust phylogenetic tree was constructed for 13 γ‐proteobacteria using the combined alignments of 205 conserved orthologous proteins.1 Only two proteins had incongruent tree topologies, which were attributed to HGT between Pseudomonas species and Vibrio cholerae or enterics. While the evolutionary relationships among these species appears to be resolved, further analysis suggests that HGT events with other bacterial partners likely occurred; this alters the implicit assumption of γ‐proteobacteria monophyly. Thus, any thorough reconstruction of bacterial evolution must not only choose a suitable set of molecular markers but also strive to reduce potential bias in the selection of species. BioEssays 26:463–468, 2004. © 2004 Wiley Periodicals, Inc.

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