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中华实验和临床感染病杂志(电子版) ›› 2017, Vol. 11 ›› Issue (01) : 20 -26. doi: 10.3877/cma.j.issn.1674-1358.2017.01.005

基础论著

新型HIV-1核酸定量内标构建及验证
李庆1, 刘芳1, 岳秀娟1, 李冰2, 陈德喜1,()   
  1. 1. 100069 北京,首都医科大学附属北京佑安医院北京市肝病研究所
    2. 100069 北京,首都医科大学附属北京佑安医院改革与绩效办公室
  • 收稿日期:2016-10-11 出版日期:2017-02-15
  • 通信作者: 陈德喜
  • 基金资助:
    首都卫生发展科研专项项目(No.首发2014-1-1151); 北京市卫生系统高层次卫生技术人才培养计划(No. 2013-3-072)

Construction and verification of a novel HIV-1 nucleic acid quantitative internal standard

Qing Li1, Fang Liu1, Xiujuan Yue1, Bing Li2, Dexi Chen1,()   

  1. 1. Beijing Institute of HepatologyBeijing You’an Hospital, Capital Medical University, Beijing 100069, China
    2. Office of Reform and Performance, Beijing You’an Hospital, Capital Medical University, Beijing 100069, China
  • Received:2016-10-11 Published:2017-02-15
  • Corresponding author: Dexi Chen
引用本文:

李庆, 刘芳, 岳秀娟, 李冰, 陈德喜. 新型HIV-1核酸定量内标构建及验证[J]. 中华实验和临床感染病杂志(电子版), 2017, 11(01): 20-26.

Qing Li, Fang Liu, Xiujuan Yue, Bing Li, Dexi Chen. Construction and verification of a novel HIV-1 nucleic acid quantitative internal standard[J]. Chinese Journal of Experimental and Clinical Infectious Diseases(Electronic Edition), 2017, 11(01): 20-26.

目的

构建一种稳定的以病毒颗粒为基础的HIV核酸定量检测内标。

方法

在实验室原有新型表型耐药载体pcDNA6.2-LTR gagpol的基础上,利用PCR扩增法在不改变p24保守区基础上突变核苷酸,经Gateway重组得到含突变碱基的pNL43-?ENV-LUC-ATTR表达载体,该载体与水泡性口膜炎病毒(VSV)质粒共转染293细胞48 h后收集上清中HIV-1内标假病毒颗粒,检测p24抗原含量,定量假病毒滴度,以倍比稀释内标质粒、内标质粒与阳性标本混合品、内标假病毒颗粒与阳性标本混合品为模板进行实时定量PCR法,观察内标质粒、内标假病毒颗粒内的核酸与内标引物探针的匹配情况,以及是否受样本探针引物的干扰。

结果

定点突变表型耐药载体pcDNA6.2-LTR gagpol内的p24保守区片段;获得仅具有1次感染性的HIV-1假病毒颗粒(3.61 × 109 IU/ml);p24抗原检测含量为283.2 pg/ml;实时定量PCR法确定内标质粒、内标假病毒颗粒内的核酸与内标引物探针匹配良好,内标引物探针对阳性标本探针无干扰。

结论

成功建立了一种以假病毒颗粒为基础的HIV-1核酸定量检测内标。

Objective

To construct a stable HIV-1 nucleic acid quantitative detection of internal standard based on virus particles.

Methods

p24 region was mutated without changing p24 conservative district and inserted into phenotype resistant vector pcDNA6.2-LTR gagpol by PCR amplification method, following by the construction of pNL43-?ENV-LUC expression vector containing the specific mutation base by Gateway recombinant technology. This vector and VSV plasmid were cotransfected into 293T cell lines and HIV-1 pseudotyped virus was collected from the supernatant 48 hours later. The loads of HIV-1 were quantified by detection of p24 antigen titers. The multiproportion diluted liquids of the internal standard plasmid, the mixture of the internal standard plasmid and positive samples and the mixture of the internal standard pseudotyped viral particles and positive samples were used as the template for the real-time quantitative PCR to verify whether the nucleic acids levels matched the probes of internal standard plasmid, and whether they could be interfered by the sample probe and primers.

Results

The fragment of specific site mutation in p24 conservative region was inserted into the phenotype resistant vector pcDNA6.2-LTR gagpol. The detective p24 antigen was 283.2 pg/ml, while HIV-1 pseudotyped virus was 3.61 × 109IU/ml. Internal standard plasmid and internal standard pseudotyped viral particles matched the probes of internal standard plasmid, which were confirmed using real-time quantitative PCR and not interfered by the sample probe and primers.

Conclusion

The novel internal standard construced with pseudotyped virus could be used to detect plasma HIV-1 level.

图1 HIVc2和HIVc3片段PCR扩增结果
图2 HIVc4克隆后酶切结果
图3 HIVc4克隆后酶切测序验证结果
图4 p24保守区突变测序比对结果
图5 pcDNA6.2-LTR gagpol-p24t载体结构图
表1 内标扩增引物序列
表2 PCR扩增程序(分步拼接和扩增内标序列)
图6 内标质粒倍比稀释后定量PCR结果
图7 内标质粒与HIV阳性血清混合后定量PCR结果
图8 p24抗原检测标准曲线
表3 p24抗原和病毒含量检测结果
图9 内标质粒包装的假病毒掺入HIV病毒血清内定量PCR结果
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