肝癌患者乙型肝炎病毒X基因变异的研究

Detection for genotypes of hepatitis B virus in Hunan Province of China by nested PCR with multiplex pairs of primers

AIM: To determine the genotypes of hepatitis B virus (HBV) in Hunan Province of China by nested PCR with multiplex pairs of genotype-specific primers.

METHODS: Ten outer and inner primers were designed on the basis of the conserved nature of nuleotide sequences in regions of the Pre-S1 through S genes, in which 8 inner primers were devided into mix A and B to amplify HBV of genotype A, B, C and D, E, F respectively. The two different products from one sample in second-round PCR were separately electrophoresed on a 3% agarose gel. Genotypes of HBV were determined directly by the size of PCR products. To test its reliability and veracity, we compared new nested PCR with popular PCR-RFLP, followed by repeated experiments. This nested PCR was also used in the genotyping of HBVs in 220 Hunan patients with chronic hepatitis B to know the distribution of HBV genotype in Hunan Province of China.

RESULTS: The results showed complete concordence between the two assays and 100% recurrence in the repeated experiments. Of the 220 Hunan patients, 190 (86.4%) were genotype B and 30 (13.6%) were genotype C.

CONCLUSION: This new nested PCR can help to determine HBV genotypes clearly and directly with reliable and accurate results. With the application of this new method, the predominant HBV genotypes in Hunan are confirmed to be genotypes B and C.