In the West African population of the Gambia the class I antigen HLA-Bw53 is found at high frequency. We used the polymerase chain reaction to amplify cDNA from an individual homozygous for this allele and determined the nucleotide sequence of the polymorphic alpha 1 and alpha 2 domains. The HLA-Bw53 sequence is identical to HLA-B35 except for a short sequence at the 3' end of exon 2 (encoding the alpha 1 domain) which specifies a Bw4 rather than a Bw6 motif. This suggests an origin for HLA-Bw53 involving a gene conversion of HLA-B35 by an allele containing this Bw4 sequence. The alpha 2 domain shared by HLA-Bw53, -B35, and -Bw58 is particularly common in sub-Saharan Africans.

Original publication

DOI

10.1016/0198-8859(91)90078-n

Type

Journal article

Journal

Human immunology

Publication Date

02/1991

Volume

30

Pages

105 - 109

Addresses

Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, United Kingdom.

Keywords

Humans, DNA, HLA-B Antigens, HLA-B35 Antigen, Gene Conversion, Amino Acid Sequence, Base Sequence, Alleles, Molecular Sequence Data, Adult, Gambia, Male