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Zhonghua Gan Zang Bing Za Zhi. 2003 May;11(5):265-7.

[Hepatitis B virus genotypes and the heterogeneity of its polymerase gene].

[Article in Chinese]

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Department of Infectious Diseases, Nafang Hospital, First Military Medical University, Guangzhou 510515, China.



To study the heterogeneity of polymerase gene (P gene) within hepatitis B virus (HBV) genotypes based on a systematic analysis of 202 HBV P genes, providing some useful references for further studies on the relationship among HBV genotypes, P gene mutations, replication and nucleoside analogues drug-resistance.


202 HBV complete sequences containing P genes were obtained from GenBank and were analysed using computer softwares.


There were some genotype-related characteristics of HBV P genes. As reverse transcriptase domain was concerned, there were more amino acid divergences in genotype C and D compared with these in genotype A. There were also amino acid substitutions in the A-F conserved regions of the reverse transcriptase domain within and between HBV genotypes.


There are divergences of P genes and amino acids within and between HBV genotypes, which should be considered when amino acid changes are analyzed whether they are proposed to be drug-resistance mutations or the results from quasispecies-selected. Moreover, these divergences may affect the antiviral effect of nucleoside analogues on HBV with different genotypes.

[Indexed for MEDLINE]

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