Forensic applications of rapidly mutating Y-STR markers: current status and future perspectives

Area of Science:

• Forensic Genetics
• Human Genetics
• Molecular Anthropology

Background:

• The Y chromosome is a vital tool in forensics, anthropology, and genetics.
• Standard Y-short tandem repeat (Y-STR) markers aid in identifying male DNA, tracing lineage, and victim identification.
• Limited discrimination among closely related males restricts standard Y-STR utility.

Purpose of the Study:

• To review advances in rapidly mutating (RM) Y-STR markers for enhanced male differentiation.
• To highlight the application of RM Y-STRs in forensics and clinical genetics.
• To discuss challenges and future directions for RM Y-STR implementation.

Main Methods:

• Review of recent studies on RM Y-STR marker discovery and validation.
• Analysis of multiplex assay development for RM Y-STRs.
• Examination of advanced genotyping techniques like massively parallel sequencing (MPS).

Main Results:

• RM Y-STRs exhibit higher mutation rates, improving differentiation among closely related males.
• RM Y-STRs are effective in kinship analysis, mixture deconvolution, and clinical applications like infertility studies.
• Advanced genotyping and computational methods enhance RM Y-STR utility.

Conclusions:

• RM Y-STRs offer significant advantages over standard Y-STRs for forensic and clinical applications.
• Challenges include interpretive difficulties and population-specific mutation rate variations.
• Standardization of methods, further research, and database expansion (e.g., YHRD) are essential for optimal use.