HLA-B47

HLA-B47 (B47) is an HLA-B serotype. The serotype identifies the HLA-B*47 gene products (B*4701, B*4702, B*4703) .^[1] Comparison of B47 nucleotide sequence with other HLA-B sequences shows a segment of 228 bp identical with B44 in the alpha 1 domain and a segment of 218 bp identical with B27 in the alpha 2 domain, but only a 91 bp segment of identity with B13 in the alpha 1 domain. The complex pattern of substitutions and their degree of divergence indicate that HLA-B13 and HLA-Bw47 alleles are not related by a simple mutational event.^[2] B47 is linked to (close to on the chromosome) a gene that causes adrenal deficiency. B47 is generally low in frequency and with highest known frequencies in Central and Western Africa. (For terminology help see: HLA-serotype tutorial)

Additional recommended knowledge

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Daily Sensitivity Test

Serotype

Serotyping for B47 is poor and typing is best performed with SSP-PCR or gene sequencing.

Disease Associations

B47 is linked to Adrenal 21-hydroxylase deficiency.^[2] The CYP21 gene is located close to B47 between HLA-B and HLA-DRB1 locus.

B*4701 frequencies

References