Identification of the null HLA-A2 allele, A*0232N
Bunce, M., Procter, J., Dunn, P.P.J., Day, S., Ross, J. and Welsh, K.I. (2000) Identification of the null HLA-A2 allele, A*0232N. Tissue Antigens, 55 (1). pp. 31-36.
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We have identified a null HLA-A*02 allele, HLA-A*0232N, by using a combination of serology, flow cytometry, polymerase chain reaction using sequence-specific primers (PCR-SSP) and full-length sequencing. The null HLA-A2 allele was identified in an Asian individual originally typed by serology as an apparently homozygous HLA-A3, B51. Subsequent genotyping by PCR-SSP identified the genotype as HLA-A*0201, *0301, B*51, Cw*1402. The serological type and lack of detectable HLA-A2 was confirmed using monoclonal antibody typing reagents. Flow cytometry studies failed to identify any cell surface HLA-A2 expression on the patient 19s peripheral blood lymphocytes. Genotyping using a PCR-SSP set designed to detect null alleles revealed the mutation had not been previously described. Full-length sequencing of the allele identified an allele which was subsequently named HLA-A*0232N. This allele is identical to HLA-A*0201 except for a novel point mutation (T for C) at position 493 which creates a premature stop codon. The sequencing enabled the development of a monospecific A*0232N PCR-SSP reaction which was used to screen 973 DNA samples: no further examples of A*0232N were identified.
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