北京市2007年新确认HIV-1感染者流行毒株gag基因序列测定和亚型分析

Subtype and Sequence Analysis of gag Genes among HIV-1 Strains Circulating in Beijing during 2007

为了解北京市HIV-1亚型特点和流行特征,随机采集北京市2007年新确证HIV-1感染者的抗凝全血标本200份,分离血浆,提取病毒RNA,用套式聚合酶链式反应扩增病毒gag基因,并进行序列测定和亚型分析。系统进化分析确定北京市HIV-1流行毒株分别属于7个亚型和流行重组型,分别为A1亚型1份,B亚型35份,泰国B亚型19份,C亚型3份,CRF01_AE亚型49份,CRF07_BC亚型51份,CRF08_BC亚型3份。北京市己存在7种HIV-1亚型和流行重组型,应该加强北京市HIV-1亚型流行情况的监测。

To investigate the subtype distribution and sequence characteristics of HIV-1 strains prevalent in Beijing during 2007 and to analyze the relationship between distribution of HIV-1 subtypes and transmission routes, we collected the anti-conglutinated whole blood samples from HIV-1 newly infected individuals in Beijing during 2007 and separated plasma specimens from the aamples. RNAs were extracted and the gag genes from the various samples were amplified by RT-PCR and nest-PCR. The PCR products were sequenced directly and phylogenetic analyses of gag genes were performed using the MEGA2 software. Among 200 HIV-1 plasma samples, 161 gag HIV-1 gene fragments were amplified and analyzed. Seven HIV- 1 subtypes or circulating recombinant forms （CRFs） of HIV-1 including AI（1 strains）, B（35 strains）, Thai B（19 strains）,C（3 strains）, CRF01 AE （49 strains）, CRF07 BC（51 strains）, CRF08_BC（3 strain） were identified circulating in Beijing. The gene divergences inside the subtypes were different, with 7.7 %, 6.5%, 6.7%, 6.7%, 5.5%, 4.3%, 5.8%, in subtype A1, B, Thai B, C, CRF01_AE, CRF07_BC, CRF08_BC, respectively. Subtypes CRF07_BC and CRF01_AE were predominant in Beijing account for 31.7% and 30.4% among samples. Seven HIV-1 subtypes exist in Beijing and the surveillance of HIV-1 gene variation should be paid more attention.