畜牧兽医学报 ›› 2023, Vol. 54 ›› Issue (9): 3991-3997.doi: 10.11843/j.issn.0366-6964.2023.09.037

• 研究简报 • 上一篇    下一篇

猪流行性腹泻病毒RAA-CRISPR/Cas13a检测方法的建立与初步应用

刘华1,2, 殷冬冬3, 邵颖1, 宋祥军1, 王振宇1, 潘孝成3, 涂健1, 何长生2, 朱良强2*, 祁克宗1*   

  1. 1. 安徽农业大学, 合肥 230036;
    2. 安徽省动物疫病预防与控制中心, 合肥 230091;
    3. 安徽省农业科学院畜牧兽医研究所, 合肥 230031
  • 收稿日期:2023-02-24 发布日期:2023-09-22
  • 通讯作者: 祁克宗,主要从事动物疫病病理与生物防制研究,E-mail:qkz@ahau.edu.cn;朱良强,主要从事动物疫病防控研究,E-mail:vetzhu@126.com
  • 作者简介:刘华(1982-),男,安徽宁国人,高级兽医师,博士生,主要从事动物病原生物学研究,Tel:0551-62930645,E-mail:vetliuhua@163.com
  • 基金资助:
    国家自然科学基金面上项目(31972642);安徽省高校协同创新项目(GXXT-2019-035)

Detection of Porcine Epidemic Diarrhea Virus by Recombinase Aided Amplification Combined with CRISPR/Cas13a

LIU Hua1,2, YIN Dongdong3, SHAO Ying1, SONG Xiangjun1, WANG Zhenyu1, PAN Xiaocheng3, TU Jian1, HE Changsheng2, ZHU Liangqiang2*, QI Kezong1*   

  1. 1. Anhui Agricultural University, Hefei 230036, China;
    2. Anhui Animal Disease Prevention and Control Center, Hefei 230091, China;
    3. Institute of Animal Husbandry and Veterinary Medicine, Anhui Academy of Agricultural Sciences, Hefei 230031, China
  • Received:2023-02-24 Published:2023-09-22

摘要: 将重组酶辅助扩增技术(recombinase aided amplification,RAA)与规律间隔性成簇短回文重复序列相关 Cas13a 蛋白(CRISPR-Cas13a)技术相结合,即RAA-Cas13a,建议建立高效、灵敏、特异的猪流行性腹泻病毒(porcine epidemic diarrhea virus,PEDV)检测方法。针对PEDV N基因保守区设计RAA 特异性引物和 CRISPR RNA(crRNA),利用 RAA 技术扩增样本核酸,并进行 CRISPR-Cas13a荧光检测,以RT-qPCR为对照方法,评价该方法的灵敏度、特异性及与RT-qPCR法的一致性。结果表明,该方法最低可检测至101 copies·μL-1,且与猪圆环病毒1型、猪圆环病毒2型、猪圆环病毒3型、猪繁殖与呼吸综合征病毒、猪瘟病毒及猪伪狂犬病病毒等常见猪源病原核酸检测无交叉反应。采用RAA-Cas13a检测40份临床样本与RT-qPCR方法阳性符合率为100%,阴性符合率为84.6%,总符合率为95%,Kappa值为0.881。本研究建立的RAA-Cas13a方法灵敏度高、特异性强,为PEDV的临床诊断和流行病学监测提供了可靠的技术手段。

关键词: 猪流行性腹泻病毒, CRISPR/Cas13a, 重组酶辅助扩增, N基因, 检测

Abstract: The aim of this paper is to establish a rapid, sensitive, and specific detection method for porcine epidemic diarrhea virus (PEDV) by recombinase aided amplification (RAA) combined with the Clustered Regularly Interspaced Short Palindromic Repeats associated protein 13a (CRISPR-Cas13a), called RAA-Cas13a. The specific primer for RAA and CRISPR RNA (crRNA) of the conserved region of the PEDV N gene were designed. The sample nucleic acids were amplified by RAA, whose amplification products were then detected with CRISPR-Cas13a and use RT-qPCR as a control method to evaluate the sensitivity, specificity, and consistency of this method. The results showed that the method could detect as low as 101 copies·μL-1 and had no cross-reactivity with pig-derived pathogens such as porcine circovirus type 1, porcine circovirus type 2, porcine circovirus type 3, porcine reproductive and respiratory syndrome virus, swine fever virus and pseudorabies virus. The positive coincidence rate of 40 clinical samples detected by RAA-Cas13a and RT-qPCR method was 100%, the negative coincidence rate was 84.6%, the total coincidence rate was 95%, and the Kappa value was 0.881. The established RAA-Cas13a detection method has high sensitivity and strong specificity, providing a reliable technical means for the clinical diagnosis and epidemiological monitoring of PEDV.

Key words: porcine epidemic diarrhea virus, CRISPR/Cas13a, recombinase aided amplification, N gene, detection

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