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Summary. The nucleotide sequence diversity present among hepatitis C virus (HCV) isolates allows rapid adjustment to exterior forces including host immunity and drug therapy. This viral response reflects a combination of a high rate of replication together with an error‐prone RNA‐dependent RNA polymerase, providing for the selection and proliferation of the viruses with the highest fitness. We examined HCV subtype 1a whole‐genome sequences to identify positions contributing to genotypic and phenotypic diversity. Phylogenetic tree reconstructions showed two distinct clades existing within the 1a subtype with each clade having a star‐like tree topology and lacking definite correlation between time or place of isolation and phylogeny. Identification of significant phylogenetically informative sites at the nucleotide level revealed positions not only contributing to clade differentiation, but which are located at or proximal to codons associated with resistance to protease inhibitors (NS3 Q41) or polymerase inhibitors (NS5B S368). Synonymous/nonsynonymous substitution mutation analyses revealed that the majority of nucleotide mutations yielded synonymous amino acids, indicating the presence of purifying selection pressure across the polyprotein with pockets of positive selection also being detected. Despite evidence for divergence at several loci, certain 1a characteristics were preserved including the length of the alternative reading frame/F protein (ARF/F) gene, and a subtype 1a‐specific phosphorylation site in NS5A (S349). Our analysis suggests that there may be strain‐specific differences in the development of antiviral resistance to viruses infecting patients who are dependent on the genetic variation separating these two clades.
Journal of Viral Hepatitis – Wiley
Published: Sep 1, 2011
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