乙型肝炎病毒基因分型与肝细胞癌发生发展的研究进展

Distribution of hepatitis B virus C/D recombinant genotypes in Qinghai Province

AIM

To distinguish two forms of hepatitis B virus (HBV) C/D recombinant and investigate the distribution of HBV C/D recombinant genotypes in Qinghai Province.

METHODS

A total of 217 chronic HBV infected serum samples were collected from Qinghai Province. Two fragments of HBV, 535-1460 nt and 1779-2400 nt, were amplified and sequenced. The two forms of C/D recombinant were confirmed by the phylogenetic tree constructed based on 593-799 nt, 799-1450 nt and 1799-2400 nt. The samples of C/D recombinant were determined by INNO-LiPA HBV genotyping assay.

RESULTS

The distribution of HBV genotypes in Qinghai Province detected by the phylogenetic tree based on different fragments was as follows: CD1 (61.9%); CD2 (8.4%); C (27.0%) and B (2.8%). Ethnically, the C/D recombinant had a higher prevalence in Tibetan patients (91.5%) than in Han populations (62.6%). The distribution of HBV genotypes in Tibetan patients was significantly different from that in Han populations (χ² = 17.9, P < 0.01). Clinically, there was no significant difference in viral load between Tibetan and Han populations (F = 0.68, P > 0.05), and between males and females. There was no significant difference in HBeAg positive/negative ratios or HBV viral load between the C/D recombinant genotype and genotype C (χ² = 0.28, P > 0.05; t = 1.125, P > 0.05). The majority (87.8%) of samples of C/D recombinant were reported to be genotype D by INNO-LiPA HBV genotyping assay.

CONCLUSION

The CD1 (10-799 nt) recombinant of HBV is the dominant genotype in Qinghai Province. The clinical outcomes of different C/D recombinant genotypes should be further studied, and the results of INNO-LiPA HBV genotyping assay should be reinterpreted in Qinghai Province.