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- Title
Molecular genetic analysis of the Am phenotype of the ABO blood group system.
- Authors
Asamura, H.; Ota, M.; Takayanagi, K.; Saito, S.; Tsukada, K.; Fukushima, H.
- Abstract
Background and Objectives Many sequences of variants in the ABO blood group system have been analysed, but genetic information is not available on the rare Am phenotype blood group. We isolated the Am phenotype in one family and performed molecular analysis on this allele. Materials and Methods Exons 6 and 7 of the ABO gene were analysed using genomic DNAs from members of one family containing Am phenotype individuals via polymerase chain reaction–restriction fragment length polymorphism (PCR–RFLP) and DNA sequencing. Results In the Am allele, two single base substitutions were detected compared with the A101 allele. Both were C → T mutations at nucleotide positions 467 and 761. PCR–RFLP using the Acc I restriction enzyme was performed to detect the Am allele in 214 samples that had already been determined as type A or O by serological tests, but no sample was found to contain an Am allele. Conclusions In this study a new allele with a single-base substitution at nucleotide position 761 was identified in the Am phenotype. We designated this new allele as A112 (according to the guidelines for human gene nomenclature) and determined that PCR–RFLP analysis using the Acc I restriction enzyme will be useful for detecting this allele.
- Subjects
ABO blood group system; PHENOTYPES; MOLECULAR genetics
- Publication
Vox Sanguinis, 2002, Vol 83, Issue 3, p263
- ISSN
0042-9007
- Publication type
Article
- DOI
10.1046/j.1423-0410.2002.00221.x