The Y chromosome and its use in forensic DNA analysis

Area of Science:

• Forensic genetics
• Human genetics
• Molecular biology

Background:

• Y chromosome analysis was historically undervalued in forensics due to limited individual identification capabilities.
• Its significance is now recognized, especially in sexual assault cases with limited male DNA evidence.
• The AMELY gene on the Y chromosome is routinely used for sex determination in autosomal DNA analysis.

Purpose of the Study:

• To highlight the forensic value of Y chromosome analysis.
• To discuss the genetic structure and analysis of the Y chromosome.
• To explore its application in inferring ancestry and its role in criminal and historical investigations.

Main Methods:

• Analysis of Y chromosome short-tandem repeat (STR) markers using multiplex systems.
• Review of international forensic guidelines for Y chromosome testing.
• Case study analysis of criminal and historical investigations.

Main Results:

• Y chromosome analysis is effective in sexual assault cases with minimal assailant DNA.
• It provides valuable lineage information for inferring geographical and familial ancestry.
• Case examples demonstrate its utility in complex forensic scenarios.

Conclusions:

• Y chromosome testing offers significant advantages in forensic investigations, particularly for sexual assault cases and ancestry determination.
• The decision to use Y chromosome analysis requires careful consideration of case specifics and ethical implications.
• Advancements in Y chromosome STR analysis have enhanced its forensic applicability and value.