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Nucleotide sequence of the hepatitis C virus genome from a patient negative for anti-HCV by the first generation antibody assay.

Recently many isolates of Hepatitis C virus have been reported. Published sequences are from complete or partial genomic sequences of HCV (1). Comparison of the nucleotide sequences of HCV isolates revealed considerable heterogeneity among different genotypes of HCV. It also revealed that there are rather conserved regions in the genome. The sequence of the region which possibly encodes viral core protein is conserved among different genotypes. However, all HCV isolates reported to date are derived from either patients or healthy carriers who were positive for anti-C 100. In this study, we tried to isolate new HCV RNA from patients infected with HCV whose NS4 region is considerably different from the previously reported HCV strains and consequently lack anti-C100 and yet positive for HCV RNA by the PCR by the use of primers from the noncoding region. The serum from a patient with NANBH who was positive for anti-p22 but negative for anti-C 100 was selected as a starting material. RNA extraction, cDNA synthesis and amplification were performed as described previously (2). Ten primer sequences of both sense and anti-sense orientations were selected from