title: [Genetic of the 21 hydroxylase deficiency].
abstract: A dose genetic linkage exist between the HLA complex (especially HLA-B), and the 21 hydroxylase deficiency form of adrenal hyperplasia. By their polymorphisms HLA antigens can be used as "markers" to follow the segregation of 21-OH deficiency in families, to diagnose the heterozygous offspring and eventually to offer a prenatal diagnosis to couples at risk. In late onset forms of 21-OH deficiency the same genetic linkage has been demonstrated with a high frequency of HLA-B14 antigen.
mesh_terms: D000312:Adrenal Hyperplasia, Congenital / Q000175:diagnosis / Q000235:genetics* / Q000276:immunology; D005260:Female; D006580:Genetic Carrier Screening; D008040:Genetic Linkage; D006680:HLA Antigens / Q000235:genetics*; D006801:Humans; D008297:Male; D010375:Pedigree; D011110:Polymorphism, Genetic; D011247:Pregnancy; D011296:Prenatal Diagnosis; D013255:Steroid 21-Hydroxylase / Q000235:genetics; D013250:Steroid Hydroxylases / Q000172:deficiency*
chemical_list: D006680:HLA Antigens; D013250:Steroid Hydroxylases; D013255:Steroid 21-Hydroxylase
vernacular_title: Génétique du déficit en 21-hydroxylase.