MBE Advance Access originally published online on March 10, 2004
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Mol. Biol. Evol. 21(6):1074-1080. 2004
DOI: 10.1093/molbev/msh109
© 2004 by the Society for Molecular Biology and Evolution. ISSN: 0737-4038
A Large Variation in the Rates of Synonymous Substitution for RNA Viruses and Its Relationship to a Diversity of Viral Infection and Transmission Modes
Center for Information Biology and DNA Data Bank of Japan, National Institute of Genetics, Mishima, Japan
E-mail: tgojobor{at}genes.nig.ac.jp.
RNA viruses successfully adapt to various environments by repeatedly producing new mutants, often through generating a number of nucleotide substitutions. To estimate the degree of variation in mutation rates of RNA viruses and to understand the source of such variation, we studied the synonymous substitution rate because synonymous substitution is exempt from functional constraints at the protein level, and its rate reflects the mutation rate to a great extent. We estimated the synonymous substitution rates for a total of 49 different species of RNA viruses, and we found that the rates had tremendous variation by 5 orders of magnitude (from 1.3 x 10–7 to 6.2 x 10–2 /synonymous site/year). Comparing the synonymous substitution rates with the replication frequencies and replication error rates for the RNA viruses, we found that the main source of the rate variation was differences in the replication frequency because the rates of replication error were roughly constant over different RNA viruses. Moreover, we examined a relationship between viral life strategies and synonymous substitution rates to understand which viral life strategies affect replication frequencies. The results show that the variation of synonymous substitution rates has been influenced most by either the difference in the infection modes or the differences in the transmission modes. In conclusion, the variation of mutation rates for RNA viruses is caused by different replication frequencies, which are affected strongly by the infection and transmission modes.
Key Words: RNA virus • evolution • synonymous substitution rate • replication frequency • infection mode • transmission mode
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