新型TaqMan-MGB探针实时荧光定量PCR检测HCV-RNA方法学的建立

摘要

目的 建立一种快速、准确定量HCV-RNA的实时荧光定量PCR检测方法.方法 Clustal X软件对HCV核酸序列进行比对分析,在HCV-RNA的保守区域5'UTR设计引物和探针,棋盘滴定法对实时荧光定量PCR体系进行性能优化,制作假病毒颗粒作为定量标准品对新建方法进行性能评价,并与临床常用HCV-RNA定量检测试剂盒进行比对分析,探讨其应用价值.结果 建立HCV核酸定量高灵敏度方法,该方法可以检测1a,1b,2a,3a,3b,6a,6b等多个HCV基因型,检测HCV-RNA的灵敏度为50 IU/ml,精密度CV＜5％,检测结果可溯源至卫生部临床检验中心丙型肝炎病毒核酸(HCV-RNA)血清标准物质GBW09151a.新建方法与凯杰HCV-RNA荧光定量检测试剂盒同时检测40例临床样本,阳性一致率为100％,阴性一致率为56％;自建方法检测阳性的14个样本中,凯杰试剂0个阳性,表明自建方法的检测灵敏度要高于凯杰试剂.结论 建立的HCV核酸定量新方法灵敏度高、特异性好、精密度高,可应用于临床.%Objective Developing a rapid and accurate real-time qPCR method for the detection of HCV-RNA.Methods HCV nucleotide sequence was analysed in Clustal software and primers and probe were designed in the conserved region of 5'UTR.The reaction system optimization of real-time qPCR method was used chessboard titration,pseudoviral particles were used as quantitative standard to assess the performance.New methods was compared with clinical commonly used kit of HCV-RNA and discuss the application value.Results The sensitivity of new real-time qPCR method was 50 IU/ml,coefficient variation was less than 5％.The quantitative results of this method could be traceable to national standards of GBW09151a.40 samples were determined by new methods and clinical commonly used kit of HCV-RNA,the positive concordance rate was 100 ％,the negative concordance rate was 56 ％.14 samples were positive by new method,but negative by Qiagen kit,illustrating that the sensitivity of new method was superior to Qiagen kit.Conclusion New TaqMan-MGB probe-based real-time qPCR method is a specific,sensitive,simple,rapid and exactly used to detection of HCV-RNA.