乙型肝炎病毒S基因限制性片段长度多态性分型方法的建立及应用

目的 建立乙型肝炎病毒(HBV)S基因片段聚合酶链反应-限制性片段长度多态性(RFLP)的基因分型方法并用于基因型与临床疾病谱关系的研究。 方法 比较GenBank中124株各基因型HBV全序列的S基因核苷酸序列及13株单独S基因序列,设计利用限制性内切酶Mbo Ⅰ、BsTN Ⅰ、BsmA Ⅰ、HpaⅡ酶切S基因片段鉴定HBV基因型(A-F)的方法。对贵州地区176份乙型肝炎患者血清进行基因分型并分析基因型与疾病谱的关系。直接测序2份B型和3份C型毒株的PCR扩增产物,以验证本酶切分型方法的正确性。 结果 测序结果证明本方法能够准确鉴定基因型。在176份标本中,B型100份(56.8％),C型76份(43.2％),未发现其他基因型。B型中无症状携带者(ASC)比例(40.0％)高于C型(15.8％),x2=12.16,P<0.005;慢性中度比例(14.0％)低于C型(31.6％),x2=7.88,P<0,005。 结论 本S基因片段PCR-RFLP基因分型方法简便、准确。贵州地区存在HBV B和C基因型。

Establishing a new genotyping method of hepatitis B virus by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) to analysis on S region and its application

OBJECTIVE: To establish a new polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method of genotyping HBV using Mbo I, BsTN I, BsmA I, Hpa II and investigate the relationship between genotype and clinical spectrum of hepatitis B. METHODS: 124 full-genomic HBV sequences and 13 S-genomic sequences were analyzed, genotype specific regions were identified by the restriction enzymes Mbo I, BsTN I, BsmA I, Hpa II. And 176 samples from different kinds of hepatitis B were genotyped by this method. Five samples had been randomly selected and directly sequenced their S gene, to assess the accuracy. RESULTS: In 176 serum samples of patients with hepatitis B from Guizhou area, genotype B and C were found in 56.8% and 43.2% respectively. The proportions of genotype B and C in ASC were 40.0% and 15.7% (chi-square = 12.16, P < 0.005); and they were 31.6% and 14.0% in CHB (chi-square = 7.88, P < 0.005). CONCLUSION: Genotyping HBV, based on S gene RFLP seems to be highly sensitive, differential and accurate and could be used in large-scale surveys. HBV genotype B and C are existed in Guizhou area.