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Nucleic Acids Research, 2002, Vol. 30, No. 19 4272-4277
© 2002 Oxford University Press

Synonymous codon usage is subject to selection in thermophilic bacteria

David J. Lynn, Gregory A. C. Singer and Donal A. Hickey*

Department of Biology, University of Ottawa, 30 Marie Curie, Ottawa, ON K1N 6N5, Canada

*To whom correspondence should be addressed. Tel: +1 613 562 5800; Fax: +1 613 562 5744; Email: dhickey{at}uottawa.ca

The patterns of synonymous codon usage, both within and among genomes, have been extensively studied over the past two decades. Despite the accumulating evidence that natural selection can shape codon usage, it has not been possible to link a particular pattern of codon usage to a specific external selective force. Here, we have analyzed the patterns of synonymous codon usage in 40 completely sequenced prokaryotic genomes. By combining the genes from several genomes (more than 80 000 genes in all) into a single dataset for this analysis, we were able to investigate variations in codon usage, both within and between genomes. The results show that synonymous codon usage is affected by two major factors: (i) the overall G+C content of the genome and (ii) growth at high temperature. This study focused on the relationship between synonymous codon usage and the ability to grow at high temperature. We have been able to eliminate both phylogenetic history and lateral gene transfer as possible explanations for the characteristic pattern of codon usage among the thermophiles. Thus, these results demonstrate a clear link between a particular pattern of codon usage and an external selective force.


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