Developmental validation of the PowerPlex® Y23 System: a single multiplex Y-STR analysis system for casework and...

Area of Science:

• Forensic Genetics
• Molecular Biology
• Human Identification

Background:

• Current Y-STR kits have limitations in discriminating between unrelated males.
• There is a need for enhanced Y-STR analysis systems with higher discriminatory power.

Purpose of the Study:

• To introduce and validate the PowerPlex® Y23 System, a novel Y-STR amplification kit.
• To assess the system's performance in discriminating individuals and handling challenging samples.

Main Methods:

• The PowerPlex® Y23 System combines 17 established Y-STR loci with 6 new, highly discriminating loci.
• Amplification from purified DNA extracts and direct amplification from forensic substrates were performed.
• Validation studies included FBI and SWGDAM requirements, inhibitor tolerance tests, and sensitivity assessments.

Main Results:

• The six new Y-STR loci exhibit higher gene diversities, enhancing individual discrimination.
• The system demonstrated robustness against common inhibitors (hematin, humic acid, tannic acid).
• Full Y-STR profiles were consistently obtained with as little as 62.5 pg of male DNA, even in the presence of excess female DNA.

Conclusions:

• The PowerPlex® Y23 System offers superior discriminatory power for Y-STR analysis.
• It is a sensitive, robust, and reliable tool for forensic DNA typing, suitable for various sample types and challenging conditions.