首都医科大学学报 ›› 2022, Vol. 43 ›› Issue (3): 427-432.doi: 10.3969/j.issn.1006-7795.2022.03.016

• 新型冠状病毒肺炎:基础研究到临床诊治 • 上一篇    下一篇

新型冠状病毒核酸PCR检测假阳性核酸污染类型的鉴别方法

王爽1, 潘阳2, 徐新民1, 栗雅杰1, 周淳1, 张悦1, 王雅杰1*   

  1. 1.首都医科大学附属北京地坛医院检验科,北京 100015;
    2.北京市疾病预防控制中心传染病地方病控制所,北京 100013
  • 收稿日期:2022-03-20 出版日期:2022-06-21 发布日期:2022-06-01
  • 基金资助:
    北京市自然科学基金重点研究专题项目(M21003),首都卫生发展科研专项项目(2021-1G-4302,2021-1G-4301)。

Identification of nucleic acid contamination in false positive result within detection of SARS-CoV-2 PCR

Wang Shuang1, Pan Yang2, Xu Xinmin1, Li Yajie1, Zhou Chun1, Zhang Yue1, Wang Yajie1*   

  1. 1. Laboratory Department, Beijing Ditan Hospital, Capital Medical University, Beijing 100015, China;
    2. Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Prevention and Control, Beijing 100013, China
  • Received:2022-03-20 Online:2022-06-21 Published:2022-06-01
  • Contact: *E-mail:wangyajie@ccmu.edu.c
  • Supported by:
    Beijing Municipal Natural Science Foundation (M21003), Capital Health Development Scientific Research Project (2021-1G-4302,2021-1G-4301).

摘要: 目的 探讨新型冠状病毒核酸检测实验室出现污染类型的内部鉴定方法。方法 通过脱氧核糖核酸酶(deoxyribonuclease, DNase)的处理、去除反转录步骤等手段观察DNA质粒型质控品、RNA假病毒型质控品以及阳性患者核酸标本的扩增反应情况变化。结果 DNase处理1∶5、1∶25、1∶125和1∶625四个稀释度的DNA质粒型阳性质控品在15 min以上均有很好的清除作用,对RNA型的作用不大,可用于验证DNA型污染;去除反转录步骤对RNA型假病毒质控品的靶基因扩增有明显的影响,而对DNA型没有作用,可用于验证RNA型污染。结论 通过结合DNase和去除反转录步骤的方法可以鉴定出新型冠状病毒核酸实验室污染成分的类型。

关键词: 新型冠状病毒, 假阳性, 实验室污染, 鉴别

Abstract: Objective To explore method to identify contamination inside laboratory within 2019-nCoV nucleic acid detection. Methods Changes in amplification reaction of DNA plasmid quality control, RNA pseudovirus quality control and samples of positive patients were observed with DNase treatment recombined with removal of reverse transcription. Results DNase treatment of DNA plasmid type positive quality control with four dilutions of 1∶5, 1∶25, 1∶125 and 1∶625 longer than 15 minutes had a good scavenging effect but had little effect on RNA type. It could be used to verify DNA type contamination. The removal of reverse transcription step had a significant impact on the target gene amplification of RNA pseudovirus quality control products but had no effect on DNA components. It could be used to identify RNA contamination. Conclusion The types of contaminated components could be identified and verified with combination of DNase treatment with removal of reverse transcription in the amplification reaction.

Key words: severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), false positive, laboratory contamination, identification

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