Development and evaluation of a rapid PCR method for the PowerPlex®S5 system for forensic DNA profiling

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• Forensic DNA profiling is a critical but time-consuming process, often taking around 10 hours.
• Reducing the duration of the amplification step is key to accelerating human identification and boosting laboratory efficiency.

Purpose of the Study:

• To optimize and assess a rapid polymerase chain reaction (PCR) method for the PowerPlex®S5 system used in forensic DNA profiling.
• To determine if a faster PCR protocol can maintain the quality and reliability of forensic DNA analysis.

Main Methods:

• The study paired fast PCR chemistries with a rapid thermal cycler to shorten the amplification phase.
• Comparative analysis was performed between the optimized fast protocol and the standard amplification protocol for the PowerPlex®S5 system.

Main Results:

• Amplification time was reduced by 70%, from approximately 10 hours to 1 hour.
• Sensitivity and heterozygous peak height ratios were largely comparable between the fast and standard protocols.
• A slight decrease (5%) in peak height ratio at the D18S51 locus and a 2.6% increase in average mean stutter were observed with the fast protocol.

Conclusions:

• The rapid PCR method offers a significant time saving for forensic DNA profiling.
• While generally effective, further optimization and validation are recommended, particularly concerning locus-specific variations like D18S51 and stutter analysis.
• The fast protocol shows potential to replace standard amplification conditions in forensic laboratories, pending further validation.