Abstract
The identification of the novel allele HLA-B*1546, which has serological B50 and B72 reactivity, was found in two members of a family of Turkish origin. In the sequence analysis the new allele differs from B*1501 by four nucleotides in exon 2. Its structure suggests that it may have originated by gene conversion with B*40, B*41, B*44, B*4501, B*47, B*4901 or B*50. At the protein level, the new allele has three amino acid differences compared to B*1501. Sequence alignment demonstrates that amino acid residue 46 is crucial for serological B72 reactivity. Due to substantial differences with other B*15 variants a possible mismatch may impair clinical outcome of bone marrow transplantation.
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