MPKin-YSTR: Interpretation of Y chromosome STR haplotypes for missing persons cases

Area of Science:

• Forensic Genetics
• Population Genetics
• Computational Biology

Background:

• Y chromosome Short Tandem Repeat (STR) haplotypes are crucial for forensic identification and male lineage determination.
• Existing SWGDAM guidelines lack specific protocols for Y-STR haplotype kinship analysis.
• High Y-STR mutation rates complicate kinship assessments in missing person cases and multi-male reference scenarios.

Purpose of the Study:

• To address the limitations in interpreting complex Y-STR haplotype data for kinship analysis.
• To develop and implement advanced computational methods for more robust Y-STR evidence interpretation.
• To enhance the utility of Y-STR data in forensic investigations, particularly in challenging cases.

Main Methods:

• Development of a novel software program, MPKin-YSTR.
• Implementation of sophisticated computational methods, including mismatch-based counting and pedigree likelihood ratio approaches.
• Application of these methods to interpret complex Y-STR haplotype evidence.

Main Results:

• The MPKin-YSTR software successfully implements advanced computational methods for Y-STR haplotype interpretation.
• The software is designed to improve the analysis of complex kinship scenarios involving Y-STR data.
• Enhanced interpretation of biological evidence is expected, leading to more investigative leads.

Conclusions:

• MPKin-YSTR offers a significant advancement in interpreting Y-STR haplotype data for forensic kinship analysis.
• The software addresses critical challenges posed by Y-STR mutation rates in complex cases.
• Improved interpretation capabilities will aid in solving crimes by providing more actionable investigative leads.