1887

Abstract

The genomic sequences of many hepatitis C virus (HCV) isolates have been reported and a variety of virus genotypes have been classified based on homology in the conserved regions. We have previously identified five distinct genotypes (1a, 1b, 2a, 2b and 3b) in Japanese patients with chronic HCV infection by comparing the sequences of the NS5 region. The complete nucleotide sequence for five genotypes (1a, 1b, 1c, 2a and 2b) have already been reported and we report here the complete nucleotide sequence of genotype 3b. The isolate (HCV Tr) was 9439 nucleotides long, excluding the poly(U) tract at its 3′ end, and encodes a single long open reading frame of 3023 amino acids. Total nucleotide sequence homologies were 68·4 to 68·7%, 68·3 to 69·0%, 67·2%, 65·8 % and 65·6 % compared with type 1a, 1b, 1c, 2a and 2b genomes, respectively. The amino acid sequences of these five genotypes were highly homologous in the core, NS3 and NS5B regions, but the E2/NS1 region, which contains hypervariable regions 1 and 2, and the NS5A region were poorly conserved. Although it was possible to detect antibody against the relatively homologous core and NS3 regions by ELISA, the presence of divergent protein structures must be taken into account in the development of a vaccine.

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1994-12-01
2021-10-24
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