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Selection pressures on codon usage in the complete genome of bacteriophage T7

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Summary

We searched the complete 39,936 base DNA sequence of bacteriophage T7 for nonrandomness that might be attributed to natural selection. Codon usage in the 50 genes of T7 is nonrandom, both over the whole code and among groups of synonymous codons. There is a great excess of purineany base-pyrimidine (RNY) codons. Codon usage varies between genes, but from the pooled data for the whole genome (12,145 codons) certain putative selective constraints can be identified. Codon usage appears to be influenced by host tRNA abundance (particularly in highly expressed genes), tRNA-mRNA interactions (one such interaction being perhaps responsible for maintaining the excess of RNY codons) and a lack of short palindromes. This last constraint is probably due to selection against host restriction enzyme recognition sites; this is the first report of an effect of this kind on codon usage. Selection against susceptibility to mutational damage does not appear to have been involved.

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  1. Mark S. Rogers

    Present address: Department of Genetics, University of Glasgow, Church Street, G11 5JS, Glasgow, Scotland

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  1. Department of Genetics, Trinity College, Dublin 2, Ireland

    Paul M. Sharp, Mark S. Rogers & David J. McConnell

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  1. Paul M. Sharp
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  2. Mark S. Rogers
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  3. David J. McConnell
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Sharp, P.M., Rogers, M.S. & McConnell, D.J. Selection pressures on codon usage in the complete genome of bacteriophage T7. J Mol Evol 21, 150–160 (1985). https://doi.org/10.1007/BF02100089

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  • DOI: https://doi.org/10.1007/BF02100089

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