Developmental validation of the PowerPlex(®) 21 System.

Area of Science:

• Forensic Science
• Genetics
• Molecular Biology

Background:

• Short tandem repeat (STR) analysis is crucial for forensic DNA profiling.
• Global harmonization of STR loci is essential for international casework and database comparisons.

Purpose of the Study:

• To perform a developmental validation of the PowerPlex® 21 System for forensic DNA analysis.
• To assess the system's performance for casework and database workflows, including direct amplification.

Main Methods:

• Developmental validation of the PowerPlex® 21 System, a 21-locus STR multiplex.
• Testing of single-source samples, direct amplification from FTA® storage cards, and mixture analysis.
• Evaluation of reaction condition robustness and inter-site reproducibility.

Main Results:

• Reliable genotyping of single-source samples with >95% allele calls at 50 pg DNA.
• Successful direct amplification from FTA® cards using provided reagents and modified protocols.
• Detection of >95% of minor alleles in 1:9 mixtures; robust reaction conditions and reproducible results across sites.

Conclusions:

• The PowerPlex® 21 System is a validated and reliable tool for forensic DNA profiling.
• The system's locus overlap with global core STR loci facilitates international data sharing.
• The system demonstrates high performance for casework and database applications, including direct amplification from FTA® cards.