ABO genotyping by inverse PCR technique.

Area of Science:

• Molecular Biology
• Genetics
• Human Physiology

Background:

• Accurate ABO blood group typing is crucial for transfusions and disease association studies.
• Existing methods may have limitations in resolving specific allele variations.

Purpose of the Study:

• To develop and validate novel inverse PCR-based techniques for typing major ABO blood group alleles.
• To simultaneously detect allele-determining nucleotides in exons 6 and 7 of the ABO gene.

Main Methods:

• Inverse PCR amplification of a 1.7 kb fragment from ABO gene exons 6-7.
• Intramolecular ligation using Acc I restriction sites.
• Allele typing via inverse PCR-restriction fragment length polymorphism (IP-RFLP) and allele-specific inverse-PCR (ASIP).

Main Results:

• IP-RFLP successfully differentiated A(1), B, O(1)-standard (O(A)), and O(1)-variant (O(G)) alleles based on fragment sizes (365-bp, 272-bp, 193-bp, 128-bp).
• ASIP generated distinct fragment sizes (222-bp, 124-bp, 232-bp) for A(1), B, and O(1) alleles, respectively.
• The methods accurately identified allele-specific polymorphic regions.

Conclusions:

• Developed inverse PCR techniques provide precise typing of major ABO blood group alleles.
• These methods are adaptable for analyzing polymorphic regions in other genes.
• The study enhances capabilities in genetic typing and molecular diagnostics.