含内参的登革和寨卡病毒三重RT-qPCR检测方法的建立与评估

Development and evaluation of a triplex RT-qPCR assay with internal references for detection of the Dengue and Zika viruses

目的 本研究旨在建立一种登革病毒以及寨卡病毒并含人类基因为内参的三重RT-qPCR检测方法,可以同时检测出内参、登革病毒以及寨卡病毒。方法 针对登革病毒4种血清型的保守区域和寨卡病毒的NS1基因以及人类各个组织中稳定表达的β-actin基因,设计3组特异性引物和探针。构建4种血清型的登革病毒、寨卡病毒以及β-actin标准质粒作为阳性质控品,采用L_(9)(3^(4))正交实验方法确定最佳反应条件,对其特异性、灵敏性及覆盖面进行验证与临床评估,并与检测登革病毒的商品化试剂盒进行了一致性评估。结果 本实验建立的三重RT-qPCR检测方法与12种相近虫媒病毒无非特异性交叉反应;对登革病毒与寨卡病毒的检测灵敏度分别为2.99和2.18 copies/μL组内和组间重复性变异系数均在1.5%以内;与商品化试剂盒相比较,该检测方法对13株登革流行病毒均可获阳性结果;经过Bland-Altman一致性分析,商品化试剂盒和该方法对临床阳性样本检测结果一致性达到92.59%。结论 本研究建立了一种特异性强、灵敏度高的含内参的登革病毒和寨卡病毒三重RT-qPCR检测方法,可作为登革病毒与寨卡病毒感染者的早期快速鉴别诊断的有效工具,也可用于病毒暴发地区的快速筛查。

A triplex RT-qPCR assay with human genes as internal references was established for detection of the Dengue and Zika viruses(DENV and ZIKV,respectively).The conserv ed regions of the four serotypes of DENV,along with the NS1 gene of ZIKV and the humanβ-actin gene,which is stably expressed in various human tissues,were targeted by three sets of specific primers and probes.Standard plasmids for four serotypes of DENV,ZIKV,andβ-actin were constructed as positive controls.Optimal reaction conditions were determined through an L 9(34)orthogonal experiment.The specificity,sensitivity,and coverage of the assay were verified and evaluated clinically,and the consistency was evaluated against a commercial kit for detection of DENV.The triplex RT-qPCR assay established exhibited no non-specific cross reactions with 12 similar arboviruses.The detection sensitivity for DENV and ZIKV were 2.99 and 2.18 copies/μL,respectively,and the intra-group and inter-group repeatability coefficients of variation were within 1.5%.As compared to the commercial kit,the proposed assay obtained positive results for 13 epidemic strains of DENV.Bland-Altman consistency analysis confirmed that the consistency of the detection results of clinical positive samples between the commercial kit and the proposed assay was 92.59%.The highly specific and sensitive triplex RT-qPCR assay with internal references is an effective tool for early and rapid differential identification of DENV and ZIKV.