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Gene Order Phylogeny of the Genus Prochlorococcus
Authors:Haiwei Luo  Jian Shi  William Arndt  Jijun Tang  Robert Friedman
Institution:1. Department of Biological Sciences, University of South Carolina, Columbia, South Carolina, United States of America.; 2. Department of Computer Science and Engineering, University of South Carolina, Columbia, South Carolina, United States of America.;University of Stellenbosch, South Africa
Abstract:

Background

Using gene order as a phylogenetic character has the potential to resolve previously unresolved species relationships. This character was used to resolve the evolutionary history within the genus Prochlorococcus, a group of marine cyanobacteria.

Methodology/Principal Findings

Orthologous gene sets and their genomic positions were identified from 12 species of Prochlorococcus and 1 outgroup species of Synechococcus. From this data, inversion and breakpoint distance-based phylogenetic trees were computed by GRAPPA and FastME. Statistical support of the resulting topology was obtained by application of a 50% jackknife resampling technique. The result was consistent and congruent with nucleotide sequence-based and gene-content based trees. Also, a previously unresolved clade was resolved, that of MIT9211 and SS120.

Conclusions/Significance

This is the first study to use gene order data to resolve a bacterial phylogeny at the genus level. It suggests that the technique is useful in resolving the Tree of Life.
Keywords:
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