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MBE Advance Access published online on November 10, 2004
Molecular Biology and Evolution, doi:10.1093/molbev/msi040
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2004; all rights reserved
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Accepted November 2, 2004

Research Article

Codon Bias Signatures, Organisation of Microorganisms in Codon Space and Lifestyle

A. Carbone 1*, F. Képès 2, and A. Zinovyev 3

1 Génomique Analytique, Université Pierre et Marie Curie, INSERM U511, 91, Bd de l'Hôpital, 75013 Paris, France
2 ATelier de Génomique Cognitive, CNRS ESA 8071/Genopole, 523, Terrasses de l'Agora, 91000 Evry, France
3 Institut des Hautes Études Scientifiques, 35, route de Chartres, 91440 Bures-sur-Yvette, France

* To whom correspondence should be addressed.
A. Carbone, E-mail: carbone{at}ihes.fr


  Abstract

New and simple numerical criteria based on Codon Adaptation Index are applied to the complete genomic sequences of 80 Eubacteria and 16 Archaea, to infer weak and strong genome tendencies towards content bias, translational bias and strand bias. These criteria can be applied to all microbial genomes, even those for which little biological information is known, and a codon bias signature, that is the collection of strong biases displayed by a genome, can be automatically derived. A codon bias space, where genomes are identified by their preferred codons, is proposed as a novel formal framework to interpret genomic relationships. Principal Component Analysis confirms that although GC content has a dominant effect on codon bias space, thermophilic and mesophilic species can be identified and separated by codon preferences. Two more examples concerning lifestyle are studied with Linear Discriminant Analysis; suitable separating functions characterized by sets of preferred codons are provided to discriminate: translationally biased (hyper)thermophiles from mesophiles, and organisms with different respiratory characteristics, aerobic, anaerobic, facultative aerobic and facultative anaerobic. These results suggest that codon bias space might reflect the geometry of a prokaryotic "physiology space". Evolutionary perspectives are noted, numerical criteria and distances among organisms are validated on known cases, and various results and predictions are discussed both on methodological and biological grounds.

Keywords: Prokaryotes; Archaea; codon bias; codon space; microbial evolution; microbial lifestyle.
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