Development and validation of a multiplex typing system with 32 Y-STRs for forensic application

Area of Science:

• Forensic Genetics
• Human Genetics
• Molecular Biology

Background:

• Y-chromosomal short tandem repeats (Y-STRs) are crucial for male lineage identification.
• High mutation rates in Y-STRs enhance discrimination capacity among related males.
• Existing Y-STR kits require validation for new forensic applications.

Purpose of the Study:

• To validate the efficiency and accuracy of the novel Y32 multiplex amplification kit.
• To assess the performance of the Y32 kit across various forensic parameters.
• To determine the suitability of the Y32 kit for casework and population studies.

Main Methods:

• Utilized the Y32 six-dye multiplex amplification kit targeting 32 Y-STR loci.
• Performed developmental validation according to SWGDAM guidelines.
• Evaluated PCR conditions, sensitivity, mixture analysis, concordance, inhibition, species specificity, reproducibility, sizing precision, stutter, and population data.

Main Results:

• The Y32 kit demonstrated high efficiency and accuracy in all tested parameters.
• Reliable performance was observed across sensitivity, mixture, and concordance studies.
• The kit proved highly informative for forensic applications, including population genetics.

Conclusions:

• The Y32 kit is an efficient, accurate, and reliable tool for forensic casework.
• Its comprehensive set of Y-STR loci provides high discrimination power for male identification.
• The Y32 kit meets developmental validation standards for forensic use.