James Chun-I Lee¹, Li-Chin Tsai¹, Chia-Hwei Chen¹ and Jan-Gowth Chang^2
1 Department of Forensic Science, Central Police University, Taiwan
² Department of Molecular Medicine, Taipei Municipal Jen-Ai Hospital, Taiwan

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ABO blood groups were determined by the mutagenically separated polymerase chain reaction (MS-PCR). The products from two sets of PCR reactions using the same program for the nucleotides at positions 261 and 703 from cDNA at the ABO locus were used to distinguish A, B and O alleles. Two forward mutagenic allele-specific primers of different lengths for the ABO polymorphic sites were paired with the same reverse primer in each PCR reaction. The 216 bp fragment of the PCR products for the 261st nucleotide was A or B allele-specific and the 195 bp fragment was O allele-specific. The 126 bp fragment of the PCR products for the 703rd nucleotide was B allele-specific and the 106 bp fragment was A or O allele-specific. The ABO genotypes were determined by the intersection of the predicted alleles from these two PCR reactions. The PCR products were obtained using 10 ng of DNA in 50 µL of PCR reaction mixture and electrophoresed in 4% agarose gel. In this study, 265 ABO-phenotype known samples (A:31, B:48, AB:6 and O:180) in Chinese were used. The results from this study were confirmed by the PCR-RFLP ABO genotyping method. This technique is a simple, rapid and reliable method for ABO genotyping.