基础医学与临床 ›› 2021, Vol. 41 ›› Issue (11): 1653-1657.

• 技术与方法 • 上一篇    下一篇

基于磁珠捕获和连接的免核酸提取的恒温扩增技术

邱栎臻, 杨明珠, 骈红茹, 郑直*   

  1. 中国医学科学院基础医学研究所 北京协和医学院基础学院 生物化学与分子生物学系,北京 100005
  • 收稿日期:2021-08-02 修回日期:2021-09-17 发布日期:2021-10-27
  • 通讯作者: *zhizheng100@126.com
  • 基金资助:
    国家重大科技计划(2018ZX10101001);国家自然科学基金(81902167);中国医学科学院医学创新基金(2018-I2M-1-001)

Nucleic acid extraction-free isothermal amplification based on magnetic beads capture and ligation

QIU Li-zhen, YANG Ming-zhu, PIAN Hong-ru, ZHENG Zhi*   

  1. Department of Molecular Biology and Biochemistry, Institute of Basic Medical Sciences CAMS, School of Basic Medicine PUMC, Beijing 100005, China
  • Received:2021-08-02 Revised:2021-09-17 Published:2021-10-27
  • Contact: *zhizheng100@126.com

摘要: 目的 建立基于磁珠捕获和连接的环介导恒温扩增(CLIP-LAMP)方法体系,以适用于大体积样品处理,为病原体检测提供一种新的技术方法。方法 在NCBI数据库搜索免疫缺陷病毒(HIV)的一段保守序列,使用实验室特有软件根据该保守序列设计相应的捕获探针和检测探针。磁珠表面通过亲和作用偶联寡核苷酸来抓取捕获探针;由于特异性捕获探针的存在使得核酸提取步骤被省略,靶标 DNA 或 RNA 直接特异地结合捕获探针;检测探针经过连接步骤后作为最终模板参与荧光定量环介导恒温扩增反应。将此方法用于 HIV 体外转录(IVT)合成的 RNA检测,并且评估方法的灵敏度和特异性。结果 构建的方法体系成功应用于 HIV 的IVT检测;现阶段可以检测到32 CPs/μL。该方法有可能处理>1 mL的大体积样本,并且可在2 h内完成检测。结论 建立了基于磁珠的CLIP-LAMP技术,为快速、简便地进行大体积病原体检测提供了新的方法和思路。

关键词: 磁珠, HIV, 环介导恒温扩增

Abstract: Objective Capture and ligation probe-loop-mediated isothermal amplification CLIP-LAMP method with-out nucleic acid extraction based on magnetic beads was established to provide a new technique for the detection of human immunodeficiency virus (HIV) in large volume samples. Methods Our team earched a conservative sequence of the virus and used specific soft-ware to design a corresponding capture probe and detection probe. Streptavidin-coated magnetic beads was bound to biotin-labeled DAN molecules, connecting capture probe. The nucleic acid extraction was deleted because the capture probe was able to bind target DNA or RNA directly and specifically. After the ligation step, the detection probe was used as the final template to participate in the fluorescence quantitative loop-mediated isothermal amplification reaction.This method was used for the detection of HIV in vitro transcription (IVT) to assess the sensitivity and specificity of the method. Results This method was successfully applied to the detection of HIV IVT with the detection rate of 32 CPs/μL. The method was capable of processing 1 ml of samples, and the detection was completed in two hours. Conclusions The nucleic acid extraction-free loop-mediated isothermal amplification based on magnetic beads capture provides a new method and for rapid and simple detection of HIV and potentially other pathogenic microbes in large volume samples.

Key words: magnetic bead,HIV,loop-mediated isothermal amplification

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