Reverse complement-PCR, an innovative and effective method for multiplexing forensically relevant single nucleotide...

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• Forensic DNA typing technologies face limitations with challenging samples such as touch evidence, hair, and skeletal remains.
• Degraded DNA and low copy number DNA present significant hurdles for standard DNA analysis methods.
• Current methods often yield limited or no data from these difficult forensic samples.

Purpose of the Study:

• To introduce and evaluate a novel, single-step PCR target enrichment method, Reverse Complement PCR (RC-PCR).
• To demonstrate the utility of RC-PCR for amplifying degraded and low copy number DNA.
• To present an improved 85 SNP-plex panel for enhanced discrimination in forensic DNA analysis.

Main Methods:

• Development and application of Reverse Complement PCR (RC-PCR) for DNA target enrichment.
• Utilizing a novel single-step amplification process with reduced sample manipulation.
• Implementation of a new 85 SNP-plex panel designed for short amplicon targeting.

Main Results:

• RC-PCR successfully amplifies single nucleotide polymorphisms (SNPs) from fragmented and low copy number DNA.
• The method yields results from samples where standard DNA typing methods fail or provide limited data.
• The 85 SNP-plex panel offers significantly higher discrimination power compared to previous multiplexes.

Conclusions:

• RC-PCR is a powerful tool for forensic DNA analysis, especially for challenging samples.
• The streamlined sample preparation of RC-PCR reduces labor and contamination risk.
• The enhanced 85 SNP-plex panel represents a substantial advancement for forensic casework involving difficult DNA samples.