A novel A*24 allele, A*2442, was detected through routine bone marrow donor screening

In this article, we report the identification of a new HLA-A allele found in a DNA sample which was part of the routine bone marrow donor typing performed in our laboratory. This novel allele officially designated as A*2442 was found in a sample from a female Caucasoid donor (Franken, Bavaria, Germany; lab code 142654) and differs from the closest related allele A*2408 by two nucleotide exchanges. In position 81, the A (A*2408) is changed to 81 C in the novel allele A*2442, resulting in an amino acid substitution at codon 27, glutamine (A*2408) is replaced by histidine ( 3 1 Gln→ 3 1 His). In position 292, the G (A*2408) is changed to C also resulting in an amino acid replacement, the codon 98 asparagine is mutated to histidine ( 9 8 Asn→ 9 8 His) in the new A*2442 allele. The second allele was determined to be A*0301. Further typing of this sample is B*1501 B*4001.