Cloning and sequence analysis of E1, E2/NS1 region of genotype 2a hepatitis C virus genome / 中华实验和临床病毒学杂志

ABSTRACT

<p><b>BACKGROUND</b>To investigate sequence of the complete E region of genotype 2a hepatitis C virus genome and to set up the basis for the further study on biological functions of envelope proteins of HCV.</p><p><b>METHODS</b>Two cDNA fragments of 770bp, 1,100bp long, from serum of a patients infected HCV, were amplified by reverse transcription nested polymerase chain reaction (RT-nPCR). After being digested with two restriction endonucleases, the two fragments were cloned into JM105 respectively, then sequenced.</p><p><b>RESULTS</b>The two corresponding nucleotide sequences were obtained and ligated. The complete nucleotide sequences of envelope region and corresponding deduced amino acid sequences were compared with those of HCV-1, HC-C2, HCV-BK, HC-J6 and HC-J8. The homology of nucleotide sequence of the isolated strains was 60.5%, 60.1%, 59.7%, 87.8% and 67.5% respectively; the amino acid sequence homology to the isolated strains was found to be 67?3%, 66.4%, 65.0%, 87.8%, 79.0%, respectively.</p><p><b>CONCLUSIONS</b>The results indicate that the isolated strain (HCV-JS) belongs to genotype 2a, but there is heterogeneity between HCV-JS and HC-J6 strain.</p>