title: Prevalence of HLA-DQ beta chain non-Asp alleles in type I (insulin-dependent) diabetics with young and older ages of onset.
abstract: Particular HLA-DQ beta chain alleles were reported as immunogenetic markers of type I diabetes mellitus with young onset of the disease. In a homogeneous German population, we studied HLA-DR specificities and HLA-DQ beta chain alleles in young-onset (less than 21 years of age; n = 185) and adult-onset (greater than 40 years of age; n = 48) insulin-dependent diabetics. In both cohorts of type I diabetics, the HLA-DR3 and -DR4 specificities were significantly increased. The presence of an HLA haplotype with an amino acid other than aspartic acid at position 57 of the DQ beta chain was significantly associated with type I diabetes in both cohorts (etiologic fraction: 93% and 73%). We conclude that the presence of DNA sequences coding for an amino acid other than aspartic acid at the 57th position of the DQ beta chain provides a molecular risk marker for type I diabetes of both and adult onset.
authors.affiliation: Klinikum der Johann Wolfgang Goethe-Universität, Zentrum der Inneren Medizin, Frankfurt am Main.
authors.forename: B O
authors.initials: BO
authors.lastname: Boehm
authors.forename: W A
authors.initials: WA
authors.lastname: Scherbaum
authors.forename: K
authors.initials: K
authors.lastname: Schöffling
authors.forename: P
authors.initials: P
authors.lastname: Kühnl
authors.forename: P
authors.initials: P
authors.lastname: Althoff
authors.forename: B
authors.initials: B
authors.lastname: Manfras
authors.forename: K H
authors.initials: KH
authors.lastname: Usadel
authors.forename: M
authors.initials: M
authors.lastname: Trucco
mesh_terms: D000293:Adolescent; D000328:Adult; D000483:Alleles; D001224:Aspartic Acid / Q000235:genetics; D016009:Chi-Square Distribution; D002648:Child; D002675:Child, Preschool; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics*; D005260:Female; D006683:HLA-DQ Antigens / Q000235:genetics*; D015803:HLA-DR3 Antigen / Q000235:genetics; D015804:HLA-DR4 Antigen / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D006683:HLA-DQ Antigens; C053186:HLA-DQ2 antigen; D015803:HLA-DR3 Antigen; D015804:HLA-DR4 Antigen; D001224:Aspartic Acid