Journal of Forensic Medicine

   

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

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

CLC Number: