[Relationship between Shenzhen HBV genotype and precore/core promoter mutation and antiviral effects]

To study the relationship between hepatitis B virus genotyping Shenzhen isolates and HBV precore/core promoter mutation and antiviral effects.

The HBV genotyping of 165 patients with HBV was carried out with mAbs ELISA. HBV precore/core promoter mutation was detected with gene chip technology in 24 patients with CHB. The relationship between HBV genotyping and interferon, lamivudine effects was analyzed.

(1) Out of 165 cases, 106 (64.2%) of type B but 48 (29.1%) of type C were found. Type B accounted for 95.4% in group ASC, and type C for 64.7%in group LC (P<0.05). (2) Precore/core promoter mutation was found in 16 cases (10 of type B, and 6 of type C) out of 24 cases. Out of 16 cases, precore/core promoter mutation (nt1896, 1862) was found in 10 cases (9 cases of type B and 1 case of type C), while basal core promoter mutation (BCP mutation, nt1762,1764) was found in 6 cases (1 case of type B and 5 of type C). (3) Among 27 patients with CHB HBAg (+) treated with interferon, 11 cases of type B but 1 case of type C were tested to be fully responsive to interferon. Among 29 patients with CHB HBAg (+) treated with lamivudine, 15 cases of type B but 3 cases of type C were tested to be continuously responsive to lamivudine.

(1) HBV genotype popularity in Shenzhen area was classified as type B the first and type C the second. (2) Type C seems more apt to develop BCP mutation and cirrhosis, and to be less responsive to interferon or lamivudine.