畜牧兽医学报 ›› 2022, Vol. 53 ›› Issue (5): 1638-1643.doi: 10.11843/j.issn.0366-6964.2022.05.032

• 研究简报 • 上一篇    下一篇

猫疱疹病毒1型RPA-Cas12a-LFD检测方法的建立及初步应用

黄坚1,2, 刘韵佳1, 杨晓农1,2, 李妍1,2*   

  1. 1. 西南民族大学畜牧兽医学院, 成都 610041;
    2. 西南民族大学教学动物医院, 成都 610041
  • 收稿日期:2021-08-12 出版日期:2022-05-23 发布日期:2022-05-25
  • 通讯作者: 李妍,主要从事临床兽医学研究,E-mail:lyvet2004@163.com
  • 作者简介:黄坚(1984-),广西柳州人,讲师,博士,主要从事动物临床疾病诊疗和兽医临床微生物研究,E-mail:huangjian.1122@163.com;刘韵佳(1996-),四川成都人,硕士,主要从事动物疾病临床诊断研究,E-mail:846964301@qq.com。黄坚和刘韵佳为同等贡献作者
  • 基金资助:
    西南民族大学中央高校基本科研业务费专项(2020NQN32);西南民族大学引进人才科研启动金资助项目(RQD2021098)

RPA-Cas12a-LFD Based Nucleic Acid Detection for Feline Herpesvirus-1 and Preliminary Application

HUANG Jian1,2, LIU Yunjia1, YANG Xiaonong1,2, LI Yan1,2*   

  1. 1. College of Animal Husbandry & Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China;
    2. Veterinary Teaching Hospital, Southwest Minzu University, Chengdu 610041, China
  • Received:2021-08-12 Online:2022-05-23 Published:2022-05-25

摘要: 猫疱疹病毒1型(feline herpesvirus-1,FHV-1) 为水痘病毒属的双链DNA包膜病毒,是引起猫上呼吸道感染的主要病原之一。本研究以重组聚合酶扩增(RPA)、Cas12a反式酶切反应和侧流层析试纸条(LFD)显示技术为基础,旨在建立靶向FHV-1 TK基因的RPA-Cas12a-LFD快速可视化检测方法。根据FHV-1 TK基因的保守片段序列设计RPA引物和合成crRNA的引物,并通过反应体系验证、RPA-Cas12a-LFD检测灵敏度和特异性分析,以及临床样本的符合检测,评价FHV-1 RPA-Cas12a-LFD方法的有效性。结果显示,建立的FHV-1 RPA-Cas12a-LFD方法可以特异性地检出FHV-1(与其他猫相关病原无交叉反应),灵敏度极高(最低检测限为2.35×10-1 copies·μL-1),检测时间短,结果可视化。该方法对20份表现明显症状的患猫呼吸道样本的FHV-1检出率(35%,7/20)高于现有的TB Green qPCR方法(25%,5/20),对其中5份阳性样本的检测符合率为100%。综上表明,成功建立的FHV-1 RPA-Cas12a-LFD检测方法的特异性好和敏感性极高,不需要特殊的检测设备,可以作为FHV-1现场快速检测的有效工具。

关键词: 猫疱疹病毒1型, RPA-Cas12a-LFD, 核酸检测, 应用

Abstract: Feline herpesvirus-1 (FHV-1) is double-stranded DNA enveloped virus of Varicellovirus, is one of major causative pathogen for feline upper respiratory tract infection. Based on recombinase polymerase amplification (RPA), Cas12a trans-cleavage reaction and lateral flow dipstick (LFD), a rapid visulization method for FHV-1 detection (RPA-Cas12a-LFD) was developed and validated. RPA amplified primers and crRNA synthesized primers were designed by targeting the FHV-1 TK gene, and then validation of RPA-Cas12a-LFD reaction system, sensitivity and specificity tests, and consistensy analysis of TB Green qPCR and RPA-Cas12a-LFD for FHV-1 detection were performed respectively. The results showed that the RPA-Cas12a-LFD method could specifically detect FHV-1 without cross-reaction with other associated pathogens, with advantages of high sensitivity (detection limit was 2.35×10-1copies·μL-1), short detection time and visual readout. The detection rate of FHV-1 in 20 clinical samples (35%, 7/20) was higher than TB Green qPCR (25%, 5/20) and the coincidence rate of 5 positive samples was 100%. In conclusion, RPA-Cas12a-LFD method was of good specificity and ultrasensitivity for FHV-1 detection without special equipment, and could be a promising and reliable tool for rapid on-site diagnosis.

Key words: feline herpesvirus-1, RPA-Cas12a-LFD, nucleic acid detection, application

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