畜牧兽医学报 ›› 2019, Vol. 50 ›› Issue (6): 1261-1267.doi: 10.11843/j.issn.0366-6964.2019.06.016

• 预防兽医 • 上一篇    下一篇

猪δ冠状病毒TaqMan荧光定量RT-PCR检测方法的建立与初步应用

郑兰兰1,2, 朱静静1, 王盼1, 舒燕1, 梁青青1,2, 李炳晓1,2, 王超群3, 魏战勇1,2*   

  1. 1. 河南农业大学牧医工程学院, 郑州 450002;
    2. 河南省动物性食品安全重点实验室, 郑州 450002;
    3. 许昌海关, 许昌 461000
  • 收稿日期:2018-12-20 出版日期:2019-06-23 发布日期:2019-06-23
  • 通讯作者: 魏战勇,主要从事动物分子病毒与免疫学研究,E-mail:weizhanyong@henau.edu.cn
  • 作者简介:郑兰兰(1982-),女,河南开封人,讲师,博士,主要从事动物分子病毒与免疫学研究,E-mail:lanlan@henau.edu.cn;朱静静(1997-),女,河南周口人,本科生,主要从事动物分子病毒与免疫学研究,E-mail:130059810@qq.com。郑兰兰、朱静静为同等贡献作者
  • 基金资助:
    国家重点研发计划(2018YFD0501205);许昌市基础与前沿项目(JC2018005)

Development and Application of a TaqMan based Real-time Fluorescent RT-PCR for Specific Detection of Porcine Deltacoronavirus

ZHENG Lanlan1,2, ZHU Jingjing1, WANG Pan1, SHU Yan1, LIANG Qingqing1,2, LI Bingxiao1,2, WANG Chaoqun3, WEI Zhanyong1,2*   

  1. 1. College of Animal Husbandry and Veterinary, Henan Agricultural University, Zhengzhou 450002, China;
    2. Henan Animal Food Safety Key Laboratory, Zhengzhou 450002, China;
    3. Xuchang Customs, Xuchang 461000, China
  • Received:2018-12-20 Online:2019-06-23 Published:2019-06-23

摘要: 本研究旨在建立一种灵敏、快速检测猪δ冠状病毒(porcine deltacoronavirus,PDCoV)的TaqMan荧光定量RT-PCR方法。参照GenBank中PDCoV有关基因序列,设计一对特异性引物用于扩增PDCoV M基因。将测序正确的基因片段克隆入pMD18-T载体,构建重组质粒作为建立标准曲线的病毒模板。设计合成一对特异性引物与TaqMan探针,进行反应条件和反应体系的优化,建立快速检测PDCoV的TaqMan实时荧光定量RT-PCR方法,并进行该方法的灵敏性、特异性与重复性验证。结果表明,该方法能有效扩增1.0×101~1.0×109拷贝·μL-1的PDCoV标准质粒,建立的标准曲线呈现良好的线性关系。该方法的检测灵敏度为1.0×101拷贝·μL-1;对猪流行性腹泻病毒、猪传染性胃肠炎病毒、猪伪狂犬病病毒等病原不发生交叉反应,具有很好的特异性;重复性试验结果显示变异系数(CV)小于1%,重复性良好。对2017—2018年期间收集的河南省不同猪场的100份腹泻病料进行检测,PDCoV的阳性检出率为23%(23/100),与PDCoV SYBR Green Ⅰ荧光定量RT-PCR检测方法的符合率为100%。人工感染PDCoV的仔猪,取攻毒后不同时间的粪便样品,应用本研究建立方法与常规RT-PCR方法对样品进行检测,TaqMan荧光定量RT-PCR检测方法的灵敏度远远优于常规RT-PCR。上述结果表明,本研究所建立的TaqMan荧光定量RT-PCR检测方法能够灵敏、特异地检测PDCoV,可用于临床PDCoV的检测。

Abstract: This experiment was conducted to develop a TaqMan based real-time fluorescent RT-PCR for the detection of PDCoV. Based on the M gene sequence of PDCoV in GenBank, a pair of primers was designed, and M gene of PDCoV was amplified and cloned into pMD18-T vector to get the recombinant plasmid. Then another pair of primers and a TaqMan probe was designed, and a TaqMan based real-time fluorescent RT-PCR assay was developed by optimizing the conditions and systems of reaction. Sensitivity, specificity and reproducibility assay were determined. The results showed that this assay could detect the PDCoV between 1.0×101-1.0×109 copies·μL-1 with a good linear relation, and the sensitivity limit was 1.0×101 copies·μL-1. There were no cross-reaction with porcine epidemic diarrhea virus (PEDV), transmissible gastroenteritis virus (TGEV), pseudorabies virus (PRV) and other porcine viruses. The CV (Coefficient of Variation) of intra-assay and inter-assay were no more than 1%. The TaqMan based real-time RT-PCR assay was then used to detect 100 diarrhea clinical samples of porcine that collected from 2017 to 2018, and the PDCoV positive ratio was 23%, and the coincidence rate with SYBR Green Ⅰ real-time PCR assay was 100%. Piglets were inoculated with PDCoV, and fecal samples were collected and detected by TaqMan real-time RT-PCR and common RT-PCR assay, the results showed that the sensitivity of the former was much better than the latter. This assay provides a high sensitivity, specificity and reproducibility method for detection of PDCoV.

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