北京地区流行的HIV-1 CRF01AE株基因特征研究  

Genetic characteristics of HIV-1 CRF01_AE strains circulating in Beijing

作　　者：叶景荣[1] 卢红艳[2] 白立石[2] 辛若雷[2] 曾毅[1] 

机构地区：[1]中国疾病预防控制中心病毒病预防控制所,北京100052 [2]北京市疾病预防控制中心

出　　处：《中华流行病学杂志》2010年第11期1231-1234,共4页Chinese Journal of Epidemiology

摘　　要：目的 分析北京地区HIV-1 CRF01 AE株在的基因特征.方法 采集北京地区2006-2008年新确证HIV感染者的抗凝全血标本,分离血浆和提取病毒RNA,用反转录/巢式聚合酶链式反应扩增病毒gag基因,对获得的105条CRF01_AE株序列进行系统进化分析,并通过计算组间距离和Entropy核苷酸多态性差异方法分析病毒株的遗传特征.结果 在CRF01 AE株序列系统进化树中存在4个主要的亚簇,Homo-Max亚簇包含67例样本,同参考株CM240组间基因 离散率为5.4%,组内离散率为2.8%;Hetero亚簇包含6例样本,组间基因离散率为4.8%,组内离散率为4.2%.Mix亚簇包含8例样本,组间基因离散率为4.2%,组内离散率为5.2%.Homo-Min亚簇包含18例样本,组间基因离散率为4.4%,组内离散率为2.8%.Homo-Max、Hetero和Homo-Min亚簇无其他国家的序列,Mix亚簇与越南和泰国CRF01 AE株关系密切;核苷酸多态性分析结果显示,以Mix亚簇为参照,Homo-Max、Homo-Min和Hetero亚簇分别有37、29和11个位点的核苷酸组成,差异有统计学意义.结论 北京地区流行的CRF01_AE病毒株中首次观察到4个独立的亚簇;Homo-Max亚簇株为最主要的CRF01_AE株;Mix亚簇株与来自于泰国和越南的CRF01 AE株有较高同源性.Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in Beijing. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals being reported during 2006 to 2008 in Beijing. Gag gene fragments were amplified from RNA template which were extracted from plasma by RT and nested PCR methods. 105 CRF01_AE sequences were analyzed by phylogcnetic methods and characterized through calculating the genetic distance and Entropy analysis. Results There were four main sub-clusters in the phylogenetic tree.We named them as sub-clusters Homo-Max （ 67 sequences ）, Hetero（ 6 sequences）, Mix （8 sequences）and Homo-Min （ 18 sequences）respectively, based on the mode of transmission. It was found that no international reference strain was closely related to the sub-cluster Homo-Max, Hetero or Homo-Min,including 91 samples. The strains in sub-cluster Mix consisting 8 cases that were closely related to the strains identified in Thailand and Vietnam. Genetic distance analysis on gag genes showed that the diversity of sub-clusters Homo-Max and Homo-Min was obviously less than that of the sub-cluster Hetero or Mix. When compared with sub-cluster Mix, there were 37,29 and 11 significantly different nucleotides polymorphism compositions sites in sub-clusers Homo-Max Homo-Min and Hetero.Conclusion This was the first report describing that four main epidemic sub-clusters were existed in CRF01_AE strains prevailing in Beijing. The virus with sub-cluster Homo-Max was the dominant strain in this region with shorter period of circulation and higher proportion seen in the HIV-infected persons. The virus in sub-cluster Mix was highly homologic with the CRF01_AE strains from Thailand and Vietnam.

关 键 词：人类免疫缺陷病毒 亚型 巢式聚合酶链式反应 

分 类 号：R512.91[医药卫生—内科学]