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Methods for the Detection of Non-random Base Substitution in Virus Genes: Models of Synonymous Nucleotide Substitution in Picornavirus Genes

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Journal Virus Genes
Date 1998 Jul 9
PMID 9654679
Citations 5
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Abstract

A substantial fraction of phylogenetic divergence between closely related RNA virus genes is generally accounted for by synonymous (non-amino acid changing) point mutation. Viral evolution may be a complicated phenomena, governed by many different processes. However in this study we ask whether there are any properties in the patterns of synonymous nucleotide substitutions in three different Picornavirus genes that permit the process of accumulation of synonymous point mutation in these genes to be distinguished from some of the simplest most basic evolutionary models. We conclude that while the observed patterns in the occurrence of synonymous point substitution are consistent with those predicted by a model in which base mutation is equi-probable along a gene, and the probability of synonymous substitution determined only by local codon usage, some patterns in the actual nucleotides exchanged remain to be explained.

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