title: Extended MHC haplotypes in 21-hydroxylase-deficiency congenital adrenal hyperplasia: shared genotypes in unrelated patients.
abstract: HLA, complement, and glyoxalase I alleles were studied in 29 families in which at least one member has classical 21-hydroxylase-deficiency congenital adrenal hyperplasia. A rare complement allele, C4B*31, was found in over 20% of the haplotypes defined in these families and was always part of the complement haplotype BF*F, C2*C, C4A*Q0, C4B*31 (abbreviated FCO,31). The haplotype containing this rare set of complement alleles always carried the rare HLA allele, HLA-Bw47, usually carried HLA-A3, and almost always had the alleles HLA-Cw6, HLA-DR7, and the glyoxalase I (GLO) allele GLO1. Thus over 20% of the haplotypes in the population studied contained all or almost all of the rare extended haplotype HLA-(A3), Bw47, Cw6,DR7, FCO,31, GLO 1. 3 other haplotypes were each found twice in unrelated patients concordant for their disease phenotype and ethnic background. Extended MHC haplotypes may be markers for different genetic mutations causing 21-hydroxylase deficiency.
mesh_terms: D000312:Adrenal Hyperplasia, Congenital / Q000235:genetics*; D000483:Alleles; D002906:Chromosomes, Human, 6-12 and X; D005006:Ethnicity; D005260:Female; D005787:Gene Frequency; D005802:Genes, MHC Class II; D005838:Genotype; D006680:HLA Antigens / Q000235:genetics; D006801:Humans; D007791:Lactoylglutathione Lyase / Q000235:genetics; D008285:Major Histocompatibility Complex; D008297:Male; D006899:Mixed Function Oxygenases / Q000172:deficiency* / Q000235:genetics
chemical_list: D006680:HLA Antigens; D006899:Mixed Function Oxygenases; D007791:Lactoylglutathione Lyase