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Validation of Expressmarker mtDNA-SNP60: A mitochondrial SNP kit for forensic application
Chen Zhang1, Hui Li1, Xueying Zhao1
1Shanghai Key Laboratory of Crime Scene Evidence, Shanghai Research Institute of Criminal Science and Technology, Shanghai Public Security Bureau, Shanghai, P. R. China.
Electrophoresis
|August 31, 2016
Summary
The Expressmarker mtDNA-SNP60 kit, a forensic mitochondrial DNA kit, was validated for sensitivity, reproducibility, and specificity. It shows potential as a supplementary tool in forensic applications.
Area of Science:
- Forensic genetics
- Molecular biology
Background:
- Mitochondrial DNA (mtDNA) single nucleotide polymorphisms (SNPs) are crucial for forensic identification.
- Existing forensic mtDNA kits require validation for new applications.
Purpose of the Study:
- To validate the Expressmarker mtDNA-SNP60 kit for forensic applications.
- To assess the kit's performance according to Scientific Working Group on DNA Analysis (SWGDAM) guidelines.
Main Methods:
- Validation studies included sensitivity, precision, accuracy, reproducibility, species specificity, mixture analysis, PCR conditions, and inhibitor tolerance.
- Next-generation sequencing and family studies were used for confirmation.
- Forensic population genetics parameters were calculated.
Main Results:
- The kit achieved full profiles from ≥ 4 pg DNA, demonstrated high reproducibility across labs, and showed excellent species specificity.
- Mixture samples were profiled at ratios of 4:1, 2:1, and 1:1.
- The kit exhibited tolerance to PCR conditions and varying resistance to inhibitors.
- Family studies confirmed mother-child matching, and population genetics parameters were calculated.
Conclusions:
- The Expressmarker mtDNA-SNP60 kit is a reliable and reproducible tool for forensic mtDNA analysis.
- The kit demonstrates high species specificity and acceptable performance with inhibitors and mixture samples.
- It can serve as a valuable supplementary tool in forensic investigations.
