We have discovered a previously unpublished HLA-DRB1 allele, observed in a patient (SB), his mother, and one sibling. The undefined allele gave sporadic positive reactions with sera in the DR52-associated group. SSOPH analysis utilizing both generic and group specific primers and probes also gave ambiguous results. SB typed clearly as a DRB1*0301 (paternal allele) but the DNA from SB also bound probes specific for DRB1*14 and DRB1*11. Sequencing revealed that the undefined allele was similar to a DRB1*14 allele with a segment of sequence found in DRB1*11 alleles. The patient was MLC reactive with donors who express DRB1*0301, *1401 and *0301, *11 and was nonreactive solely to DRB1*0301 (Dw3) homozygous typing cells.
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