深圳地区艾滋病患者HIV-1毒株膜蛋白V3环的氨基酸变异分析

目的了解深圳地区艾滋病患者体内不同HIV-1亚型膜蛋白V3环的氨基酸序列特征及变异特点.方法采用逆转录套式聚合酶链反应（RT-nested-PCR）对艾滋病患者血浆HIV RNA进行扩增,对扩增产物直接测序并进行序列对比、翻译和分析.结果深圳地区艾滋病患者感染HIV病毒分属B与CRF01-AE亚型,病毒V3顶端的四肽特征主要为：GPGQ 48%、GPGR 36%、其他形式16%;其中AE亚型GPGQ百分比为76.9%,B亚型GPGR百分比为75%;还发现DQDR、DQGQ等少见V3环顶端四肽组成形式.V3环发生与SI表型有关的氨基酸突变形式高达80%.结论深圳地区艾滋病患者感染病毒V3环顶端四肽主要为GPGQ与GPGR,V3环序列高度变异,出现一些少见的V3环顶端四肽组成形式值得进一步研究.

The pilot study on mutations of HIV-1 envelop V3 loop in AIDS patients in Shenzhen

Objective To investigate the characteristics of human immunodeficiency virus(HIV-1)V3 loop amino acid mutations among AIDS patients in Shenzhen. Methods Fragments of HIV-1 env gene were amplified by RT-nested-polymerase chain reaction(PCR)from plasma of the AIDS patients in Shenzhen.The PCR products were then directly sequenced and the sequences were aligned,translated and analyzed. Results Sequence analysis showed that there were B and CRF01-AE HIV-1 subtypes in Shenzhen.The V3 loop terra peptide GPGQ accounted for about 48%,GPGR about 36%,other V3 loop terra peptide forms were 16%;the V3 loop central motif in the majority(76.9%)of the CRF01-AE strains was GPGQ,the majority(75%)of the B strains was GPGR.We also found some unusual terra peptide compositions:DQDR and DQGQ on the tip of V3 loop,some amino acid mutations at specific of V3 loop associated with SI phenotype were very common in AIDS patients(80%). Conclusions The V3 loop amino acid mutations were very common in AIDS patients,the V3 loop central motif in the majority was GPGQ and GPGR in Shenzhen,the mutations shows the change of HIV-1 phenotype and predicts that disease progress to AIDS.