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TAM类突变对B’亚型HIV病毒耐药和复制能力的影响

, PP. 655-658

Keywords: 人类免疫缺陷病毒,感染性克隆,耐药突变,复制能力

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Abstract:

目的研究T215Y和L210W等TAM类突变在B’亚型pol区遗传背景下对HIV病毒的耐药程度和复制适应性的影响。方法血浆样本来自我国中部地区1名已接受抗病毒治疗且耐药的患者,利用SGA方法获得其3个病毒准种的含TAM突变的pol基因片段,采用PCR引入点突变分别将T215Y和L210W回复突变为野生型密码子,将突变前后的pol区片段替换pNL4-3-BstII感染性克隆的相应片段,构建重组感染性克隆,利用荧光素酶和P24抗原检测分别评价重组病毒的耐药程度和复制能力。结果成功构建了3个重组感染性克隆pNL-PAT-1、pNL-PAT-2、pNL-PAT-3,TAM类突变分别为T215Y、M41L/L210W/T215Y和M41L/L210W/T215Y,回复突变后的重组感染性克隆分别为pNL-PAT-1-T215Y(-)、pNL-PAT-2-L210W(-)和pNL-PAT-3-L210W(-);与原始重组病毒比较,T215Y和L210W回复突变后的重组病毒对AZT的IC50分别下降4.9、8.1和2.7倍,感染pNL-PAT-1-T215Y(-)的培养上清中P24含量较原始毒株pNL-PAT-1高,而两株含M41L/T215Y的病毒与含M41L/L210W/T215Y突变病毒的复制能力比较结果并不一致,其中pNL-PAT-2-L210W(-)感染上清的P24含量较原始毒株略有降低,而pNL-PAT1-3-L210W(-)的P24含量则较原始毒株明显升高。结论在B’亚型pol区遗传背景下,T215Y和L210W均可引起HIV病毒对AZT的耐药程度升高,T215Y还可造成病毒复制能力的下降,但是L210W对复制能力的影响不一,基因多态性可能对病毒的耐药和复制能力具有一定的影响。

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