Forensic Mitochondrial DNA Analysis: Current Practice and Future Potential.

Area of Science:

• Forensic Science
• Genetics
• Molecular Biology

Background:

• Forensic mitochondrial DNA (mtDNA) analysis has seen minimal evolution in core methodologies over the past 20 years.
• Established Sanger-based sequencing and data interpretation remain the standard in public and private US laboratories.
• Despite technological advancements, fundamental approaches to mtDNA analysis have persisted.

Purpose of the Study:

• To provide an overview of current forensic mtDNA analysis practices in the United States.
• To highlight the need for reassessing alternative and emerging technologies in forensic mtDNA analysis.
• To frame future directions and improvements in the field of forensic mtDNA profiling.

Main Methods:

• Amplification of mtDNA control region segments from diverse biological samples.
• Sanger-based sequencing of amplified mtDNA products.
• Data interpretation using various available software packages.

Main Results:

• Current forensic mtDNA sequencing practices are largely consistent across laboratories.
• Established methods, while robust, may not fully address challenges like heteroplasmy and mixed profiles.
• Alternative methods and new technologies warrant re-evaluation for potential benefits.

Conclusions:

• The field of forensic mtDNA analysis requires periodic reassessment of alternative methods (e.g., linear array assays, dHPLC) and newer technologies (e.g., next-generation sequencing).
• Adapting to new technologies can help streamline testing, improve interpretation of complex samples, and enhance overall forensic casework.
• Continuous evaluation of methodologies is essential for the advancement of forensic mtDNA analysis.