Interpreting Mixture Profiles: Comparison between Precision ID GlobalFiler™ NGS STR Panel v2 and Traditional Methods

Area of Science:

• Forensic Science
• Genetics
• Molecular Biology

Background:

• Forensic DNA analysis relies on Short Tandem Repeats (STRs) for individual identification.
• Next-Generation Sequencing (NGS) offers high-throughput DNA sequencing with vast data output.
• Standardized interpretation rules for NGS forensic data are still under development.

Purpose of the Study:

• To compare the performance of NGS and traditional methods for analyzing DNA mixtures.
• To evaluate the ability of NGS to identify major and minor contributors in forensic samples.
• To assess the sensitivity and data yield of NGS compared to conventional techniques.

Main Methods:

• Pilot study comparing NGS (Precision ID GlobalFiler™ NGS STR Panel v2) with traditional methods.
• Analysis of twelve mixed DNA samples (saliva and urine) at various ratios (1:2 to 1:20).
• Evaluation of major and minor contributor identification in prepared DNA mixtures.

Main Results:

• NGS technology generated a large volume of data, providing additional information.
• NGS did not demonstrate higher sensitivity than traditional methods in detecting contributors in mixtures.
• The Precision ID GlobalFiler™ NGS STR Panel v2 is effective for reference samples and kinship analysis.

Conclusions:

• NGS offers enhanced data but requires careful consideration for forensic biological evidence analysis due to sensitivity limitations.
• Further research and standardized interpretation guidelines are necessary for routine NGS implementation in forensics.
• NGS is a powerful tool for specific forensic applications like kinship testing.