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Development of a PCR-based diagnostic assay for the determination of KEL genotype in donor blood samples
M T Murphy1, R H Fraser, J P Goddard
1Glasgow and West of Scotland Blood Transfusion Service, Law Hospital, Lanarkshire, U.K.
Abstract:
The polymorphism which determines expression of Kell and Cellano antigens on the redcell surface has been reported to be a single C-->T nucleotide substitution at residue 701 where T codes for the presence of Kell antigen. This was confirmed by the direct automated sequencing of PCR products amplified from individuals of known Kell phenotype. The substitution creates a Bsm I restriction enzyme site and this has formed the basis for the development of a PCR-based diagnostic assay for the determination of Kell phenotype in samples of donor blood. The assay is based on RFLP analysis of coamplified PCR products, one of which spans the K/k polymorphic site, and one control fragment which contains a Bsm I site. Digestion of the PCR products with Bsm I restriction enzyme and subsequent gel analysis of the digest allowed unequivocal determination of the K/k status of all of the samples tested.