干扰素γ基因内含子1+874位点多态性与乙型肝炎病毒感染关系的研究

目的 研究干扰素γ（IFN-γ）基因内含子1＋874位点多态性与乙型肝炎病毒（HBV）感染、转归的关系,探讨慢性HBV感染的遗传易感因素.方法 采用序列特异性引物-聚合酶链反应（PCR-SSP）技术检测231例慢性HBV携带患者、165例自限性HBV感染者和135名正常对照者IFN-γ基因内含子1＋874位点T/A单核苷酸多态性.结果 慢性HBV感染组IFN-γ基因＋874位点AA基因型频率（TT、TA、AA频率分别为9.1%、12.1%、78.8%）高于正常对照组（TT、TA、AA频率分别为12.6%、23.0%、64.4%）（x2=9.60,P=0.008）;而自限性HBV感染组（TT、TA、AA频率分别为13.9%、23.7%、62.4%）和对照组之间差异无显著性（x2=0.16,P=0.92）.结论 IFN-γ基因内含子1＋874位点多态性与慢性HBV感染有关,该位点多态性可能在决定个体HBV感染遗传易感性方面有一定意义.

Relationship between genetic polymorphisms of Interferon2gamma gene intron 1 + 874 site and susceptibilityof hepatitis B virus infection

OBJECTIVE: To explore the possible relationship between the polymorphisms of interferon-gamma (IFN-gamma) gene intron 1 at position +874 and the susceptibility of hepatitis B virus infection. METHODS: IFN-gamma gene single nucleotide polymorphism (intron 1 at position +874) were detected in 531 subjects including 231 chronic carrier of hepatitis B virus (group CC), 165 individuals who spontaneously recovered from HBV infection (group SR) and 135 healthy controls, by polymerase chain reaction with sequence specific primers. RESULTS: Significant difference of IFN-gamma +874 AA genotype frequency was found between group CC (TT, TA and AA frequencies were 9.1%, 12.1% and 78.8%, respectively) and control group (TT, TA and AA frequencies were 12.6%, 23.0% and 64.4%, respectively) (chi(2) = 9.60, P = 0.008), but no significant difference found between group SR (TT, TA and AA frequencies were 13.9%, 23.7% and 62.4%, respectively) and control group (chi(2) = 0.16, P = 0.92). CONCLUSION: There was association between IFN-gamma gene polymorphism (intron 1 at position +874) and chronic HBV infection. This study suggested the possibility that IFN-gamma gene polymorphism (intron 1 at position +874) might be important in determining an individual's susceptibility in the development of chronic HBV infection.