乙型肝炎病毒核心启动子热点突变与HBeAg存在状态

目的 :研究乙型肝炎病毒 (HBV)核心启动子 (BCP)区 176 2位和 176 4位热点突变对HBeAg存在状态的影响。方法 :采用错配引物的PCR结合限制性内切酶技术检测 90例不同HBeAg状态的HBV无症状携带者的HBVBCP热点突变。结果 :6 0例HBeAg阴性者中HBVBCP热点突变者 2 6例 (4 3.3% ) ,其中 2 0例伴有HBV前C区 (Pre C)区1896位热点突变 ;30例HBeAg阳性者中仅 3例 (10 % )出现HBVBCP热点突变 ;无HBVPre C区热点突变者中 ,19例HBeAg阴性者有 6例存在HBVBCP热点突变 (31.6 % ) ,2 8例HBeAg阳性者仅 2例有HBVBCP热点突变 (7.1% ) ,两组间比较差异具显著性 (P <0 .0 5 )。结论 :HBVBCP热点突变在HBeAg阴性HBV感染者中较常见 ,且常伴有HBVPre C区 1896位突变 ,HBVBCP热点突变可能是HBeAg阴性的另一原因

Relationship between hot spot mutation in hepatitis B virus basic core promotor and HBeAg status

Objective: This paper was to study the influence of hot spot mutation in hepatitis B virus(HBV) basic core promotor (BCP) (nt1762 and nt1764) on HBeAg staus of asymptomatic HBV carriers. Methods: Mismatched PCR was used to amplify the fragment of HBVBCP and the fragments were analysed by restrict enzyme assay. Ninety cases of HBV infection were tested for hot spot mutations in HBVBCP. Results: Twenty six(43.3%) of 60 asymptomatic HBV carriers with HBeAg negative were found to have hot spot mutations in HBVBCP, among which 20 cases were accompanied by the mutation of nt 1896 in HBV Pre C region. Hot spot mutation in HBVBCP, however,occurred only in 3(10%) of 30 asymptomatic HBV carriers with HBeAg positive. For further investigation the HBVBCP hot spot mutations in asmptomatic HBV carriers without mutation of HBV Pre C region were studied. Six(31.6%) of 19 asymptomatic HBV carriers with HBeAg negative were found to have hot spot mutation in HBVBCP. Two(7.1%) of 28 asymptomatic HBV carriers with HBeAg positive had hot spot mutations in HBVBCP, and there was a statistically significant difference between two groups. Conclusions: Hot spot mutations in HBVBCP is common in the HBV carriers with HBeAg negative and usually accompanies with nt1896 mutation of HBV Pre C region. It is possible that Hot spot mutation in HBVBCP is a new reason of HBeAg negative HBV infection.