法医学杂志

• 技术与应用 •    

国产人类DNA定量试剂盒的验证及法医学应用

陈静1(), 王亚萍2, 冯云鹏3, 胡晓欣3, 贾振军3, 刘洪迪1, 严安心1, 李永久1, 彭柱1, 刘志芳1, 陈健刚1   

  1. 1.公安部鉴定中心,北京 100038
    2.昌吉回族自治州公安局,新疆 昌吉 831100
    3.中国人民公安大学,北京 100076
  • 收稿日期:2023-11-09
  • 作者简介:陈静(1989—),女,硕士,警务技术副高级任职资格,主要从事法医遗传学研究;E-mail:wendybj121@126.com
  • 基金资助:
    中央级公益性科研院所基本科研业务费专项(2022JB019)

Validation and Forensic Application of A Domestic Human DNA Quantitative Detection Kits

Jing CHEN1(), Ya-ping WANG2, Yun-peng FENG3, Xiao-xin HU3, Zhen-jun JIA3, Hong-di LIU1, An-xin YAN1, Yong-jiu LI1, Zhu PENG1, Zhi-fang LIU1, Jian-gang CHEN1   

  1. 1.Institute of Forensic Science, Ministry of Public Security, Beijing 100038, China
    2.Changji Public Security Bureau, Changji 831100, Xinjiang Province, China
    3.People's Public Security University of China, Beijing 100076
  • Received:2023-11-09

摘要:

目的 验证一款基于实时荧光定量PCR的国产人类DNA定量试剂盒在检测人类DNA总浓度、男女性混合样品中男性DNA浓度、降解程度和抑制剂水平等方面的效能。 方法 将不同浓度、不同男女性混合比例、不同抑制剂浓度和不同降解程度的样品使用一款基于实时荧光定量PCR的国产人类DNA定量试剂盒进行检测,与市场同类产品进行比较并应用于真实案件的检材检测。 结果 该人类DNA定量试剂盒能有效检测最低0.001 65 ng/μL的人类DNA、男女性比例为1∶15 000混合样品中0.006 25 ng/μL的男性DNA,能准确反映DNA降解情况及抑制剂水平,在定量准确度、测定混合样品男女性比例、抑制剂耐受性等方面均表现优秀,并成功应用于法医学实践。 结论 该人类DNA定量试剂盒检测准确、可靠,在法医学案件检验等领域具有应用潜力。

关键词: 法医遗传学, DNA定量, 短串联重复序列, 实时荧光定量PCR, 检测效能

Abstract:

Objective To verify the performance of a domestic human DNA quantification kit based on real-time fluorescence quantitative PCR in detecting the total human DNA concentration, male DNA concentration in mixed male/female DNA samples, degradation degree and inhibition level. Methods Samples with different concentrations, different male/female ratios, different concentrations of inhibitors, and different degradation degrees were tested using the domestic human DNA quantification kit based on real-time fluorescence quantitative PCR. This kit was compared with a similar product on the market and was applied to the detection of DNA from real cases. Results The human DNA quantification kit was able to effectively detect human DNA at a minimum concentration of 0.001 65 ng/μL and male DNA at a concentration of 0.006 25 ng/μL in a mixed sample with male/female ratio of 1:15 000. It was able to accurately reflect the degradation degree and inhibition level. It performed excellently in terms of quantitative accuracy, determination of the male/female ratio in mixed samples, and inhibitor tolerance, and was successfully applied in forensic practice. Conclusion The human DNA quantification kit is accurate and reliable in detection and has application potential in forensic case examination.

Key words: forensic genetics, DNA quantification, short tandem repeat (STR), real time fluorogenic quantitative PCR, detection effectiveness

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