HIV-1毒株V3环顶端四肽多态性及原发耐药性研究

目的 探索我国河南省新蔡县既往献血人群中HIV-1病毒流行株env基因V3环顶端四肽多态性和pol基因原发耐药性变异特征.方法 套式聚合酶链反应（Nested-PCR）扩增51例确认HIV阳性样本env、pol基因部分区段并测序,PCR产物纯化后克隆,挑选克隆株鉴定为阳性后测序,以MEGA（version 3.0）等软件进行分析.结果 env基因V3环顶端四肽主要为GPGR、GPGQ、GPGK、GQGR;在pol基因PR区未发现有关蛋白酶抑制剂（PIs）的主要耐药性突变位点,在RT区共发现9条序列存在对NRTIs或NNRTIs中的一类药物耐药性突变.结论 GPGR这一典型的欧美B亚型V3环顶端四肽序列比例最高为44.44%;原发性耐药发生的比例较低,药物敏感性资料表明耐药性突变位点多表现为低度耐药性,因此提示我们在对该地区因献血感染HIV的患者在首次治疗时可不必以耐药性检测做指导.

Variation of the V3 loop tip motifs and primary drug resistance of HIV-1 strains

Objective To study the characteristics of the variation of the V3 loop tip motifs and the drug resistance in the primary treatment patients. Methods The partial region of the HIV-1 env and pol gene in 51 samples was amplified by nested polymerase chain reaction (PCR) ,purified products were cloned into the vectors, the obtained were analyzed by MEGA soft wares. Results The V3 loop tip motifs had four types in our study ( GPGR, GPGQ, GPGK, GQGR); the study on the drug resistance in primary treatment patients, showed that there were not major resistance associated with PI, and the resistance were minor mutations in protease gene. In the RT region, there were nine resistance mutants were single NRTIs or NNRTIs. Conclusion The GPGR which was the typical western V3 loop tip motifs attained to 44.44%.This results showed that the percentage of primary drug resistance was still low in our study region,suggesting no need for genotyping detection in blood donor patients before primary therapy.