1887

Abstract

Computer analysis of 158 hepatitis C virus (HCV) 5′ untranslated region (5′ UTR) sequences from the six genotypes showed that the 5′ UTR from genotype 3 displays seven specific non-contiguous nucleotide changes, at positions 8, 13, 14, 70, 97, 203 and 224. The purpose of this study was to investigate the impact of these changes on translation and replication activities. Indeed, these modifications could alter both the internal ribosome entry site (IRES) present in the 5′ UTR of the plus-strand RNA and the 3′ end of the minus strand involved in the initiation of plus-strand RNA synthesis. We found that the genotype 3-specific nucleotide changes do not modify the or translation activity of the corresponding IRES, in comparison with that of genotype 1. In contrast, replication from the minus-strand RNA is eight times less efficient for genotype 3 than for genotype 1 RNA, suggesting the involvement of some nucleotide changes in the reduction of RNA synthesis. Nucleotides 13, 14 and 224 were found to be responsible for this effect. Moreover, a reduced replicative activity was confirmed for genotype 3, but to a lesser extent than that observed , using an RNA minigenome.

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2008-01-01
2019-10-23
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Supplements

vol. , part 1, pp. 212 - 221

Oligonucleotides used in mutagenesis experiments.

Plasmids and oligonucleotides used in PCR experiments allowing synthesis of templates for RNA synthesis.

[PDF file of Supplementary Tables S1 and S2](91 KB)



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