中国寄生虫学与寄生虫病杂志 ›› 2019, Vol. 37 ›› Issue (1): 23-27.doi: 10.12140/j.issn.1000-7423.2019.01.005

• 论著 • 上一篇    下一篇

结合重组酶介导的核酸等温扩增和荧光探针快速检测日本血吸虫基因片段

赵松1(), 刘燕红2, 李婷1, 李伟1, 张键锋1, 郭利川2, 应清界2, 羊海涛1, 杨坤1,*()   

  1. 1 国家卫生和计划生育委员会寄生虫病预防与控制技术重点实验室,江苏省寄生虫与媒介控制技术重点实验室,江苏省血吸虫病防治研究所,无锡 214064
    2 江苏省奇天基因生物科技有限公司,无锡 214064
  • 收稿日期:2018-11-22 出版日期:2019-02-28 发布日期:2019-03-18
  • 通讯作者: 杨坤
  • 作者简介:

    作者简介:赵松(1978-),男,硕士,助理研究员,从事寄生虫分子生物学研究。E-mail:shanechn@163.com

  • 基金资助:
    江苏省“科教强卫工程”医学重点人才(No. ZDRCA2016056);江苏省卫生计生委科研课题(No. X201802)

Rapid detection of Schistosoma japonicum specific gene fragment by recombinase aided isothermal amplification combined with fluorescent probe

Song ZHAO1(), Yan-hong LIU2, Ting LI1, Wei LI1, Jian-feng ZHANG1, Li-chuan GUO2, Qing-jie YING2, Hai-tao YANG1, Kun YANG1,*()   

  1. 1 Key Laboratory of National Health and Family Planning Commission on Parasitic Disease Control and Prevention, Jiangsu Provincial Key Laboratory on Parasite and Vector Control Technology, Jiangsu Institute of Parasitic Diseases, Jiangsu Province, Wuxi 214064, China
    2 Jiangsu Qitian Gene Technology Co. Ltd, Wuxi 214064, China
  • Received:2018-11-22 Online:2019-02-28 Published:2019-03-18
  • Contact: Kun YANG
  • Supported by:
    Supported by the Project of Invigorating Health Care through Science,Technology and Education, Jiangsu Provincial Medical Talent (No. ZDRCA2016056) and the Fundamental Research Funds of Jiangsu Commission of Health(No. X201802)

摘要:

目的 结合重组酶介导的核酸等温扩增(recombinase aided amplification,RAA)和荧光探针方法建立日本血吸虫特异性基因片段的快速检测方法。方法 以日本血吸虫G28(SjG28)基因片段作为靶序列,应用DNAMAN 7.0软件设计合成引物及荧光探针,建立荧光RAA反应体系。扩增不同拷贝数的SjG28重组质粒,评价荧光RAA检测的敏感性;分别以日本血吸虫、曼氏血吸虫、细粒棘球绦虫、十二指肠钩口线虫、似蚓蛔线虫、华支睾吸虫基因组为模板进行荧光RAA检测,以评价该方法的特异性。采用荧光RAA分别检测500、200和50条日本血吸虫尾蚴感染的兔粪中虫卵DNA。分别在50只阴性钉螺中混入1、2、3、4、5、10只阳性钉螺,并提取DNA进行荧光RAA检测。结果 以不同拷贝数的SjG28重组质粒为模板进行荧光RAA扩增,在5 min时即可观察到明显的荧光信号,随着拷贝数的不断降低,检测到荧光信号的时间也随之延长,不同拷贝数的扩增均在10 min内完成,最低可检出的质粒浓度为10拷贝/μl。以曼氏血吸虫、细粒棘球绦虫、十二指肠钩口线虫、似蚓蛔线虫及华支睾吸虫基因组DNA为模板的荧光RAA扩增结果均为阴性。不同数量尾蚴感染的兔粪中提取的DNA样品经荧光RAA检测,均能得到有效的扩增,检测可在15 min内完成。含不同数量阳性钉螺的50只阴性钉螺提取的日本血吸虫DNA经荧光RAA检测,均能得到有效的扩增,检测可在10 min内完成。结论 本研究建立的可检测日本血吸虫核酸片段的荧光RAA方法,反应快捷,敏感性和特异性均较高。

关键词: 日本血吸虫, 基因检测, 核酸等温扩增, 荧光探针, 重组酶

Abstract:

Objective To establish a novel and rapid method to detect Schistosoma japonicum specific gene fragment using a real-time recombinase aided isothermal amplification (RAA) combined with a fluorescent probe. Methods S. japonicum G28(SjG28) was selected as the target gene to be detected, and the primers and fluorescent probes were designed accordingly. A real-time fluorescent RAA using RAA combined with fluorescent probe was established to detect SjG28. The sensitivity and specificity of the real-time fluorescent RAA was determined and optimized by using gradient dilutions of SjG28 recombinant plasmid as template and the genomic DNAs from other helminths of S. mansoni, Echinococcus granulosus, Ancylostoma duodenale, Ascaris lumbricoides and Clonorchis sinensis as controls. Then this method was applied to detect SjG28 in genomic DNA extracted from snails and feces of rabbits infected with S. japonicum. Results As low as 10 copies of SjG28 plasmid DNA could be detected by the developed real-time fluorescent RAA within 10 min. This method was able to detect SjG28 in the fecal samples from rabbit infected with different dose of cercarias (20, 200 and 500) within 15 min and snail pool (50) mixed with 1, 2, 3, 4, 5 and 10 cercaria-positive snails within 10 min. There was no product amplified from genomic DNAs extracted from other helminths: S. mansoni, E. granulosus, A. duodenale, A. lumbricoides and C. sinensis. Conclusion A novel and rapid florescent real-time fluorescent RAA method was established to detect S. japonicum with high sensitivity and specificity.

Key words: Schistosoma japonicum, Gene detection, Isothermal amplification of nucleic acid, Fluorescent probe, Recombinase

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