Developmental validation of a complementary Y-STR system for the amplification of forensic samples

Area of Science:

• Forensic Genetics
• Molecular Biology
• Population Genetics

Background:

• Y-short tandem repeat (Y-STR) loci are crucial for male lineage tracing in forensic genetics.
• Existing Y-STR kits vary in locus coverage, impacting database utility and inter-laboratory comparisons.
• Development of novel, high-plex Y-STR systems is needed to enhance discriminatory power and database harmonization.

Purpose of the Study:

• To develop and validate a new 31-locus complementary Y-STR system, SureID® Y-comp.
• To assess the performance of the SureID® Y-comp Kit for forensic casework and DNA database applications.
• To evaluate the potential of this system for improving male identification and inter-laboratory data retrieval.

Main Methods:

• Development of a 31-plex Y-STR assay (SureID® Y-comp) covering specific loci.
• Validation studies including sensitivity, specificity, inhibitor tolerance, reproducibility, and mixture analysis.
• Mutation rate analysis using 295 DNA-confirmed father-son pairs.
• Testing on various capillary electrophoresis platforms.

Main Results:

• The SureID® Y-comp Kit demonstrated high accuracy, reliability, and time-efficiency across diverse forensic samples.
• The 31-locus system exhibited enhanced discrimination power compared to existing kits.
• Mutation rate analysis provided valuable data for population genetics and forensic interpretation.
• The kit showed suitability for DNA mixtures and robustness across different electrophoresis systems.

Conclusions:

• The SureID® Y-comp Kit is a validated, high-performance tool for forensic casework and DNA database applications.
• Its comprehensive locus coverage and high discrimination power facilitate accurate male identification.
• This system supports the construction of robust forensic DNA databases and enables wider trans-database retrieval.