Abstract
Twenty-one novel human leukocyte antigen (HLA) class I and class II alleles are described: seven HLA-A alleles, five HLA-C alleles, five HLA-B alleles and four HLA-DRB1 alleles. Seventeen (∼81%) of the 21 novel alleles are single nucleotide substitution variants when compared with their most homologous allele. Nine of these single nucleotide variants cause an amino acid substitution, while eight are silent substitutions. The remaining novel alleles differ from their most similar allele by two to three nucleotide substitutions. One novel HLA-C locus allele encodes an amino acid change at codon 10 that previously has not been reported to be polymorphic for this locus. Some of the new alleles encode novel codons and unique amino acid changes at polymorphic positions in the HLA-A (codons 24 and 156) and HLA-B (codons 40 and 115) loci.
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