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Optimization of human mtDNA control region sequencing for forensic applications
Véronique Bourdon1, Carolyn Ng, Jessica Harris
1Department of Forensic Biology, The City of New York Office of Chief Medical Examiner, 421 East 26th Street, New York, NY.
Journal of Forensic Sciences
|March 27, 2014
Summary
Optimized mitochondrial DNA sequencing improves forensic identification of missing persons and unidentified remains. This enhanced method increases testing sensitivity and speed, reducing costs for critical casework.
Area of Science:
- Forensic Science
- Molecular Biology
- Genetics
Background:
- Mitochondrial DNA (mtDNA) sequencing of hypervariable regions I and II (HVI and HVII) is crucial for forensic identification.
- Current methods require specific reagent volumes and purification techniques that can be time-consuming and costly.
Purpose of the Study:
- To optimize the protocol for mtDNA HVI and HVII sequencing.
- To improve the ease, sensitivity, and speed of testing for forensic applications.
Main Methods:
- Reduced the amount of BigDye® Terminator v3.1 Ready Reaction Mix (RRM) from 4 μL to 2 μL or 1 μL.
- Replaced column filtration purification with BigDye® XTerminator™ purification.
- Utilized Sanger sequencing for HVI and HVII amplification products.
Main Results:
- The optimized protocol showed no loss in sequence length compared to standard methods.
- Increased testing quality and sensitivity, enabling HVI and HVII typing from 125 fg of nuclear DNA or 100 pg of amplicons.
- Reduced the overall testing time to 1 day and lowered testing costs.
Conclusions:
- The modified mtDNA sequencing protocol enhances efficiency and sensitivity for forensic casework.
- This streamlined approach provides faster and more cost-effective identification of missing persons and unidentified remains.
- The improved methodology allows for successful typing from significantly smaller DNA quantities.
