The Who's, What's, and Y's: Y Sex Chromosome Loss and Methylation for Analysis in Male Aging and Mortality and Forensic Science Applications

The document reviews the critical role of the Y chromosome in male health, particularly in aging and disease susceptibility. It highlights recent advancements in sequencing that reveal the complexity and genetic diversity of the Y chromosome. Loss of the Y chromosome (LOY) is linked to health issues like shorter survival in elderly males and increased cancer risk. The review emphasizes the potential of Y-specific DNA methylation sites as biomarkers for age estimation and disease risk assessment, with studies showing age-associated hypermethylation in Y-CpGs. Key genes such as NLGN4Y, DDX3Y, and TBL1Y are discussed in relation to their methylation changes with age. The findings suggest that Y chromosome methylation patterns play a crucial role in male health and aging, with potential applications in forensic science, including Y-STR profiling and developing an "epigenetic fingerprint" for forensic investigations. However, current studies are limited to specific populations, indicating a need for more diverse research.