论文部分内容阅读
目的:建立指环病毒7型(TTV7)、8型(TTV8)、10型(TTV10)实时荧光定量PCR检测体系并进行临床验证。方法:本研究根据GenBank已发布的TTV7、TTV8、TTV10基因序列设计特异性引物，构建重组质粒pMD19-T-TTV7、pMD19-T-TTV8、pMD19-T-TTV10，以其作为阳性标准品建立了基于FAM-Eclipse探针法的实时荧光定量PCR检测，并进行特异性、敏感性试验与临床样本检测。结果:TTV7、TTV8、TTV10的实时荧光定量PCR检测体系标准曲线方程分别为n y＝-0.340 2n x+114.780 0、n y＝-0.351 1n x+114.940 0、n y＝-0.348 9n x+115.020 0，相关系数都在0.99以上，与其他病毒无交叉反应，检测敏感性分别为108拷贝/μl、84拷贝/μl、98拷贝/μl。在临床小儿血清样本中的检测阳性率分别为10.9%、2.1%和4.3%。n 结论:本研究建立的TTV7、TTV8、TTV10实时荧光定量PCR检测体系具有特异性强、灵敏性高等特点，可为临床血清样本TTV检测提供一个快速手段。“,”Objective:To establish a real-time fluorescent quantitative PCR for the detection of torque teno virus types 7 (TTV7), 8 (TTV8) and 10 (TTV10) and analyze its performance in clinical sample detection.Methods:Specific primers were designed based on the gene sequences of TTV7, TTV8 and TTV10 in GenBank. Recombinant plasmids of pMD19-T-TTV7, pMD19-T-TTV8 and pMD19-T-TTV10 were constructed and used as positive standard control to establish a real-time fluorescent quantitative PCR based on FAM-Eclipse probe method. The specificity and sensitivity of the established method were evaluated. Moreover, it was validated in terms of clinical sample detection.Results:The standard curve equations of the real-time fluorescent quantitative PCR for detecting TTV7, TTV8 and TTV10 were n y=-0.340 2n x+ 114.780 0 (n R2=0.998 8), n y=-0.351 1n x+ 114.940 0 (n R2=0.995 3) and n y=-0.348 9n x+ 115.020 0 (n R2=0.991 7), respectively, and there was no cross-reaction with other viruses. The detection sensitivity of the established method for TTV7, TTV8 and TTV10 were 108 copies/μl, 84 copies/μl and 98 copies/μl, and the positive detection rates in clinical pediatric serum samples were 10.9%, 2.1% and 4.3%, respectively.n Conclusions:The established real-time fluorescent quantitative PCR for detection of TTV7, TTV8 and TTV10 was featured by strong specificity and high sensitivity, which could be used for rapid TTV detection in clinical serum samples.