[Simple and rapid detection of HLA-DRB polymorphism from forensic samples]

Area of Science:

• Molecular Biology
• Forensic Science
• Immunogenetics

Context:

• Human leukocyte antigen (HLA) typing is crucial for forensic investigations and paternity testing.
• Existing methods for HLA-DRB polymorphism detection can be time-consuming and require significant DNA input.
• The AMPLICOR HLA-DRB Typing Kit provides a potentially faster and more accessible approach.

Purpose:

• To evaluate the efficacy and applicability of the AMPLICOR HLA-DRB Typing Kit for forensic sample analysis.
• To determine the optimal conditions for Polymerase Chain Reaction (PCR) amplification using the kit with forensic DNA.
• To assess the discriminatory power of the kit in a Japanese population sample.

Summary:

• The AMPLICOR HLA-DRB Typing Kit enables simple and rapid detection of HLA-DRB polymorphism.
• Successful amplification and typing were achieved with DNA quantities as low as 0.1 ng, with the addition of 7.5 mM MgCl2 for conventional phenol-chloroform extracted DNA.
• Analysis of 50 unrelated Japanese individuals revealed 38 distinct HLA-DRB DNA patterns, with high-frequency serotypes including DR4 (24%), DR9 (18%), and DR15/16 (14%).
• The kit demonstrated utility in rape and paternity cases, though detection from a single 3cm hair shaft was limited.

Impact:

• The kit offers a valuable tool for forensic casework, improving the speed and efficiency of HLA-DRB typing.
• The findings provide population-specific data on HLA-DRB frequencies in Japanese individuals, useful for forensic databases.
• Further optimization may be needed for highly degraded or trace samples, such as single hair shafts.