Gong YH, Tan YW, Li CM, Jin YM, Wu CS, Zhang YH, Diao RL. Detection of subtypes of hepatitis B virus genotype B.
Shijie Huaren Xiaohua Zazhi 2008;
16:3091-3094. [DOI:
10.11569/wcjd.v16.i27.3091]
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Abstract
AIM: To develop a new method of detecting subtypes of hepatitis B virus (HBV) genotype B and to investigate its clinical application and significance.
METHODS: The probes specific to Ba and Bj subtypes of HBV were designed according to the phylogenetic analysis of 20 Ba, 10 Bj and 25 genotype C complete HBV genome sequences in GenBank. This method was based on the principle of reverse hybridization with Dig-labeled amplicons hybridizing to type-specific oligonucleotide probes that were immobilized on slides. Two hundred genotype B serum samples in Zhenjiang area were detected using the oligonucleotide chip, including 20 (ASC) and 180 (CH). The results of randomly chosen sera were confirmed by direct sequencing.
RESULTS: Of 200 HBV genotype B, subtype Ba and Bj accounted for 92% (n = 184) and 8% (n = 16), respectively. Of 80 cases treated with Lamivudine for 12 months, there were 6 Bj subtypes without YMDD mutations, and there were 74 cases of Ba subtypes with 21 YMDD mutations.
CONCLUSION: Ba subtype prevails in Zhenjiang area. The oligonucleotide chip is a reliable and convenient tool for the detection of HBV subtype. There is no significant difference of the response to the therapy between the two subtypes.
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