法医学杂志 ›› 2022, Vol. 38 ›› Issue (6): 719-725.DOI: 10.12116/j.issn.1004-5619.2021.510802

• 论著 • 上一篇    下一篇

miR-888和miR-891a的双重微滴式数字PCR检测在精液鉴定中的应用

魏孙祥1,2(), 陈惠香1,2, 胡胜2, 赵一霞2, 石慧霞2, 王哲2, 李文2, 季安全2(), 孙启凡2()   

  1. 1.山西医科大学法医学院,山西 太原 030001
    2.公安部鉴定中心 现场物证溯源技术国家工程实验室 法医遗传学公安部重点实验室,北京 100038
  • 收稿日期:2021-08-26 发布日期:2022-12-25 出版日期:2022-12-28
  • 通讯作者: 季安全,孙启凡
  • 作者简介:季安全,男,硕士,主任法医师,主要从事法医遗传学研究;E-mail:aqjdna@163.com
    孙启凡,女,博士,警务技术正高级职称,主要从事法医遗传学研究;E-mail:sunqifan@cifs.gov.cn
    魏孙祥(1995—),男,硕士,主要从事法医遗传学研究;E-mail:1158673871@qq.com
  • 基金资助:
    公安部科技强警基础工作专项(2019GABJC13);中央级公益性科研院所基本科研业务费专项(2019JB010)

Application of Duplex Droplet Digital PCR Detection of miR-888 and miR-891a in Semen Identification

Sun-xiang WEI1,2(), Hui-xiang CHEN1,2, Sheng HU2, Yi-xia ZHAO2, Hui-xia SHI2, Zhe WANG2, Wen LI2, An-quan JI2(), Qi-fan SUN2()   

  1. 1.School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
    2.Key Laboratory of Forensic Genetics, Ministry of Public Security, National Engineering Laboratory for Forensic Science, Institute of Forensic Science, Beijing 100038, China
  • Received:2021-08-26 Online:2022-12-25 Published:2022-12-28
  • Contact: An-quan JI,Qi-fan SUN

摘要:

目的 利用微滴式数字PCR(droplet digital PCR,ddPCR)技术建立可同时检测miR-888和miR-891a的体系,并评估其在精液鉴定中的应用价值。 方法 通过设计不同荧光修饰的报告基团的水解探针实现对miR-888和miR-891a的双重ddPCR检测,对5种体液(外周血、月经血、精液、唾液、阴道分泌液)共75份样本进行检测,采用Mann-Whitney U检验进行差异性分析,通过ROC曲线分析评估miR-888和miR-891a区分精液的能力并获得鉴别的最佳截断值。 结果 该体系双重检测与单独检测结果差异无统计学意义,检测灵敏度可达到0.1 ng总RNA,批内与批间变异系数均小于15%。经双重ddPCR检测,精液中miR-888和miR-891a的表达量均高于其他体液。经ROC曲线分析,miR-888的AUC为0.976,最佳截断值为2.250 copies/μL,判别正确率为97.33%;miR-891a的AUC为1.000,最佳截断值为1.100 copies/μL,判别正确率为100%。 结论 本研究成功建立了双重ddPCR检测miR-888和miR-891a的方法,体系的稳定性和重复性良好,可用于精液鉴定,miR-888和miR-891a均具有较高的精液鉴别能力,且miR-891a的判别正确率更高。

关键词: 法医遗传学, 微滴式数字聚合酶链反应, 微小核糖核酸, 精液, miR-888, miR-891a

Abstract:

Objective To establish a system for simultaneous detection of miR-888 and miR-891a by droplet digital PCR (ddPCR), and to evaluate its application value in semen identification. Methods The hydrolysis probes with different fluorescence modified reporter groups were designed to realize the detection of miR-888 and miR-891a by duplex ddPCR. A total of 75 samples of 5 body fluids (including peripheral blood, menstrual blood, semen, saliva and vaginal secretion) were detected. The difference analysis was conducted by Mann-Whitney U test. The semen differentiation ability of miR-888 and miR-891a was evaluated by ROC curve analysis and the optimal cut-off value was obtained. Results There was no significant difference between the dual-plex assay and the single assay in this system. The detection sensitivity was up to 0.1 ng total RNA, and the intra- and inter-batch coefficients of variation were less than 15%. The expression levels of miR-888 and miR-891a detected by duplex ddPCR in semen were both higher than those in other body fluids. ROC curve analysis showed that the AUC of miR-888 was 0.976, the optimal cut-off value was 2.250 copies/μL, and the discrimination accuracy was 97.33%; the AUC of miR-891a was 1.000, the optimal cut-off value was 1.100 copies/μL, and the discrimination accuracy was 100%. Conclusion In this study, a method for detection of miR-888 and miR-891a by duplex ddPCR was successfully established. The system has good stability and repeatability and can be used for semen identification. Both miR-888 and miR-891a have high ability to identify semen, and the discrimination accuracy of miR-891a is higher.

Key words: forensic genetics, droplet digital polymerase chain reaction (ddPCR), microRNA, semen, miR-888, miR-891a

中图分类号: