中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

中国南方四省区流行的HIV-1 CRF01_AE病毒株基因特征研究

Objective To analyze the genetic characteristics of HIV-1 CRF01_AE strains prevailing in. the four provinces of southern China. Methods Plasma samples were collected from the newly diagnosed HIV-1 individuals reported in 2006 in Guangdong, Guangxi, Jiangxi and Hunan province. The gag and env gene fragments were amplified from RNA template extracted from plasma using RT and nested PCR methods. CRF01_AE sequences were analyzed by phylogcnetie methods and characterized by calculating the genetic distance and Entropy analysis. Results Two main epidemic clusters were found to exist in the CRF01 AE strains from 210 HIV-1 CRF01 AE infected individuals collected in the 4 provinces, southern China. It was found that no international reference strain was closely correlated with cluster Ⅰ , which including 123 samples. The strains in cluster Ⅱ, consisting 57 cases of samples, were closely related with the strains identified in Vietnam. Genetic distance analysis of gag and env genes showed that the diversity of cluster Ⅰ was obviously less than that of cluster Ⅱ. Data on nucleotide polymorphism showed that nucleotides compositions of 42 sites in gag and 40 sites in env wer esignificantly different between the two clusters. When compared with cluster Ⅱ , the polymorphism decreased at 61 nucleotide sites but increased at 21 sites in cluster Ⅰ. Conclusion This was the first report describing that two main epidemic clusters were existed in CRF01_AE strains prevailing in the 4 provinces, Southern China. The vires in cluster Ⅰ was the dominant strain in this region, with shorter period of circulation and higher proportion seen in the HIV-infected population, which might belong to CRF01_AE strain with certain features facilitating the spread of the virus. The virus in cluster Ⅱ was highly homology with the CRF01_AE strains from Vietnam, and seemed to have had several events of epidemics in populations in border regions of China and Vietnam.     

山东省HIV-1感染者分子流行病学研究

目的了解流行于山东省境内艾滋病病毒(HIV-1)毒株的亚型及各种亚型的分布特点。方法对93例HIV感染者进行详细的流行病学调查，并采集外周静脉防凝血，提取前病毒DNA进行体外扩增，获得包膜蛋白(env)、核心蛋白(gag)、tat区基因的核酸片段，并对各基因区核苷酸进行测定和分析。结果发现在所有目标人群中共存在B、B’、C3种亚型以及CRF07-BC、CRF08-BC、CRF02-AG和CRF01-AE 4种重组毒株，B’亚型在人群和地域上分布最广，涉及献血员、受血者、二者的配偶和性乱人群，分布在山东省10个地市；CRF07-BC、CRF08-BC亚型以吸毒人群为主，分布在5个地市；CRF01-AE和其他亚型则主要为性乱人群，集中在几个经济发达的城市。结论山东省HIV-1亚型众多，各亚型在我省高危人群和地域分布不平衡，各有特点，从总的亚型流行特征来看，HIV-1在我省有流行加快的趋势。     

湖北省HIV-1分子流行病学研究

目的了解湖北省HIV-1基因型分布特征。方法对湖北省HIV-1主要流行区域进行流行病学调查，应用巢式聚合酶链反应对其中102例HIV-1感染者的env基因V3～V4区、gag基因P17/P24区和tat基因第一外显子区进行扩增，对各基因区阳性扩增样本进行序列测定，并对各基因区核苷酸进行序列分析。结果所有目标人群中共存在B^＋、C2种亚型以及CRF08-BC和CRF01-AE2种重组毒株，B^＋亚型在人群和地域上分布最广，涉及献血员、受血者以及二者的配偶和性乱人群，主要分布既往有偿献血员集中的地区。CRF08-BC、CRF01-AE重组主要涉及性乱人群，分布于经济发达的城市或地理位置偏南方的地区。C亚型为离散病例，主要涉及静脉毒品注射者。结论湖北省已由既往单一HIv-1 B^＋亚型转变为多种亚型、重组亚型流行的复杂局面，各亚型在省内高危人群和地域分布不平衡，各有特点，从总的亚型流行特征来看，HIV-1在湖北省有加快流行和进一步复杂化的趋势。     

HIV-1重组毒株gag区快速基因分型方法

目的建立一种简便、快速基因分型方法,对广西人类免疫缺陷病毒（HIV-1）重组毒株gag基因区进行亚型鉴定。方法从HIV阳性样本中提取核酸,使用HIV-1 M组通用引物对gag区进行第1轮扩增,第2轮使用分别检测C亚型和CRF01-AE重组型的二套特异性引物放入同一反应管中进行扩增,根据不同亚型扩增的目的带位置不同判断亚型。另外设计了一套引物,专门用于检测B’/C重组毒株。扩增出的所有样本均进行基因测序和系统树分析以验证结果。结果54份样本中,经基因测序和系统树分析证实CRF08-BC样本4份（7.41%）,CRF01-AE样本46份（85.18%）,4份（7.41）无法确定亚型。经亚型特异性引物PCR法检测出4份（100%）B’/C重组毒株,45份（97.83%）CRF01-AE重组毒株,灵敏度为98%,特异性为100%。2种方法检测结果经差异性检验显示,P〉0.05,差异无统计学意义,结果一致性高达98.15%。与基因分析结果吻合。重复实验显示,B’/C的平均重复性为100%（20/20）,CRF01-AE为98.3%（59/60）。结论该方法具有简便、快速,高度灵敏度和特异性的特点,可直接对广西HIV-1重组毒株CRFO 1-AE gag基因区进行分型。     

中国艾滋病病毒1型AE循环重组型毒株env基因的变异和进化分析

目的　研究中国艾滋病病毒 1型 (HIV 1)AE循环重组型 (CRF0 1 AE)毒株env不同基因区序列变异的特点及其与进化压力的关系。方法　应用巢式聚合酶链反应 (nested PCR)对从全国部分省收集来的HIV 1感染者血液样本中的HIV 1外膜蛋白 (env)基因进行扩增和亚型鉴定后 ,选择 3 4份CRF0 1 AE重组型HIV 1毒株env基因V3～V4区及其邻近区域的序列进行系统进化树和氨基酸变异分析 ,并计算和分析氨基酸同义替换 (Ks)值和非同义替换 (Ka)值及Ks Ka比值。结果基因系统树显示中国的 3 4份样本CRF0 1 AE重组型毒株与我国代表株AE .97CNGX2F和泰国代表株AE .CM 2 40、AE .93TH2 53聚集在一起。氨基酸替换主要发生在C3和V4区 ,而V3区和V3上游区氨基酸序列相对保守 ,糖基化位点也比较保守。V 3环顶端四肽以GPGQ为主 (87.50 % )。大部分毒株的第 3 0 6和 3 2 0位点上没有出现带正电荷的氨基酸。整个V 3～V4区的Ks值显著高于Ka值(P <0 .0 0 1) ,且Ks Ka比值显著高于 1(P <0 .0 0 1) ,只有V4区Ks Ka比值显著低于 1(P <0 .0 1)。结论　目前多数流行于中国的CRF0 1 AE重组型HIV 1毒株具有较高的同源性 ,在进化上关系密切。氨基酸替换主要发生在C3和V4区 ,而不是V3区。由于大部分毒株的第 3 0 6和 3 2 0位点上没有出现带正电荷的     

广东省艾滋病患者HIV-1基因亚型分析

目的 了解目前广东省HIV/AIDS患者HIV-1基因型的流行状况.方法 用套式PCR对222例HIV/AIDS患者外周血单核细胞(PBMC)中HIV前病毒DNA膜蛋白env基因C2-V4区及其邻近区域片段进行扩增,并对片段进行序列测定,与国际HIV-1标准毒株序列进行比较,依据同源性确定基因型.结果 222例患者中,...     

昆明市静脉吸毒感染者HIV-1env基因C2-V4区序列特征分析

目的 分析昆明市静脉吸毒（intravenous drug user,IDU）感染者艾滋病病毒1型（human immunodeficiency virus type 1,HIV-1） env基因C2-V4区序列特征及代表性广谱单克隆中和抗体（broadly monoclonal neutralizing antibodies,bmNAbs）的表位变异。方法 在昆明市收集165份IDUHIV-1感染者血浆样品,提取RNA,通过逆转录得到cDNA,巢式聚合酶链反应（nested-polymerase chain reaction,nested-PCR）扩增HIV-1膜蛋白基因C2-V4区,应用BioEdit和MEGA等生物信息软件分析所获得序列的特征,并分析2G12、PGT135、PGT128、b12和VRC01等bmNAbs的表位变异。结果 165条序列主要为CRF08_BC （74.55%）和CRF07_BC （23.03%）重组毒株,各可变环变异程度由小到大为V3区 < C3区 < V4区,并且CRF08_BC样本的C2-C4、V3区、C3区和V4区基因离散率分别大于CRF_07BC的相应区域;V3环顶端四肽存在5种类型：GPGQ （95.76%）、GPGR （1.82%）、GPRQ （1.21%）、GPGL （0.61%）和RPGQ （0.61%）;辅助受体主要为CCR5（97.58%）。90%以上的CRF08_BC和CRF07_BC重组毒株存在与2G12识别相关的糖基化位点的缺失;而b12、VRC01、PGT135和PGT128等抗体识别的位点在CRF08_BC和CRF07_BC重组毒株中的变异率低。结论 CRF08_BC和CRF07_BC为昆明市IDU感染者的主要流行毒株;CRF08_BC基因离散率高于CRF07_BC毒株;V3区序列变异程度小于C3区及V4区;2G12、PGT135、PGT128、b12和VRC01等代表性bmNAbs表位在CRF08_BC和CRF07_BC毒株存在不同程度的变异。     

不同途径感染人群HIV-1亚型分布

目的 了解河北省石家庄市不同感染人群人类免疫缺陷病毒I型(HIV-1)亚型及分布特点。方法 从石家庄市报告的148例HIV-1抗体阳性者抗凝全血中提取前病毒DNA,用套式聚合酶链反应(nested-PCR)扩增病毒膜蛋白(ENV)基因的C2-V3区并进行序列测定,与国际标准参考序列比较确定亚型。结果 148例样品分属8个亚型,45例为欧美B,37例为CRF07-BC,35例为泰国B(B'),25例为CRF01-AE,C和CRF02-AG各2例,CRF03-AB和CRF11-CPX各1例。结论 既往供受血人员和注射吸毒人群感染的HIV-1亚型相对单一,性传播亚型分布较广。     

广西HIV-1毒株膜蛋白V3环氨基酸变异分析

目的了解广西HIV-01亚型膜蛋白v3环的氨基酸序列特征及变异特点。方法应用nest—PCR对46份来自广西主要流行区的HIV-1重组毒株env基因区进行扩增后，使用ABI 310型测序仪测序，然后应用CLUSTAL、MEGA和dnatools等生物学软件对env基因区V3环及其临近区域的氨基酸序列进行分析。结果46份基因序列，43份为CRF01-AE（93．48％），3份为CRF08-BC（6．52％）；V3环氨基酸序列分析显示，CRF01-AE毒株存在7种类型：GPGQ（74．4％）、GPGR（9．3％）、GPGK（4．7％）、GPGH（4．7％）、GPGA（2．3％）、GRGE（2．3％）和RPGE（2．3％），而CRF08-BC毒株V3顶端四肽为GPGQ；根据V3环关键氨基酸推测辅助受体使用情况，结果显示：60．47％的CRF01-AE重组毒株可能使用CCR5为辅助受体，39．53％不能对辅助受体的使用做出预测，CRF08-BC重组毒株100％可能使用CCR5。结论目前广西HIV-1的主要流行株是CRF01-AE；V3环序列高度变异，顶端四肽主要是GPGQ，可能为NSI型毒株。     

山东省HIV-1流行株多基因区亚型分析

目的 了解流行于山东省境内HIV-1毒株的亚型,尤其是流行重组型毒株的种类及变异情况,分析其来源并推测其流行趋势。方法采集93份HIV-1感染者的外周静脉防凝血,提取前病毒DNA进行体外扩增,获得包膜蛋白（env）、核心蛋白（gag）、tat区基因的核酸片段,并对各基因区核苷酸进行测定和分析。结果发现在所有目标人群中共存在B、B,、C3种亚型以及CRF07-BC、CRF08-BC、CRF01-AG和CRF01-AE4种重组毒株,其中B’亚型数量最大71株（占77．2％）,CRF01-AE9株（占9．8％）,CRF07-BC、CRFOB-BC各3株（均占3．3oA）,B、C和CRF02-AG各2株（占2．2％）。3个基因区env区变异最大,gag和tat相对保守。3种优势亚型中,A／E变异最大,B’次之,B’／C最保守。结论山东省HIV-1流行毒株亚型众多。各优势毒株发生了不同程度的变异,在山东省有流行加快的趋势,应加强防控。