Rapid direct PCR for ABO blood typing

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• Traditional ABO blood typing in forensics relies on serology, often supplemented by time-consuming molecular methods.
• Existing DNA-based ABO genotyping requires a DNA isolation step, increasing costs and sample handling time.

Purpose of the Study:

• To develop a rapid, direct ABO genotyping method for forensic applications.
• To eliminate the need for DNA extraction from various biological samples before PCR analysis.

Main Methods:

• Utilized a multiplex allele-specific primer set targeting three single-nucleotide polymorphism (SNP) sites (261, 526, 803).
• Employed a fast PCR instrument and optimized polymerase for simultaneous detection of ABO alleles.
• Applied the method to fresh blood, hair, and body fluid stains.

Main Results:

• Successfully identified A, B, O01/O02, O03, and cis-AB01 alleles.
• Achieved genotyping results in approximately 70 minutes from sample collection to electropherogram.
• Demonstrated a direct genotyping approach bypassing DNA isolation.

Conclusions:

• The developed method offers a rapid, time- and cost-efficient alternative for ABO blood typing in forensic settings.
• This direct genotyping approach reduces sample handling, potentially minimizing contamination.
• The method is suitable for rapid sample screening prior to extensive short tandem repeat (STR) profiling.