Internal Validation of a Mitochondrial DNA Control Region Sequencing Workflow Using Precision ID mtDNA Whole Genome...

Area of Science:

• Forensic Science
• Genetics
• Molecular Biology

Background:

• Mitochondrial DNA (mtDNA) analysis is crucial for human identification, especially in disaster victim identification (DVI) and missing persons cases involving degraded remains.
• Capillary electrophoresis (CE)-based Sanger sequencing has been the traditional method for analyzing the mtDNA control region.
• Massively parallel sequencing (MPS) technologies offer enhanced sensitivity, higher throughput, and reduced sample consumption compared to Sanger sequencing.

Purpose of the Study:

• To validate the Ion Chef™ and Ion S5™ XL system for mtDNA sequencing using MPS.
• To evaluate key performance parameters including concordance, reproducibility, sensitivity, and mixture analysis.
• To assess the workflow's suitability for forensic casework samples.

Main Methods:

• Internal validation study of the Ion Chef™ and Ion S5™ XL MPS system.
• Evaluation of parameters: concordance, repeatability, reproducibility, cross-contamination, sensitivity, library pooling effects, and mixture analysis.
• Analysis focused on the mtDNA control region, aligning with current interpretation guidelines.

Main Results:

• The MPS workflow demonstrated reliability, sensitivity, and reproducibility.
• The system effectively handled various parameters critical for forensic analysis.
• Results indicate the potential for accurate analysis of challenging forensic samples.

Conclusions:

• The internal validation supports the implementation of this MPS workflow in forensic laboratories.
• This technology provides a robust alternative for mtDNA analysis in human identification cases.
• The study highlights the advantages of MPS for analyzing degraded and limited forensic samples.