title: The Karlsburg type 1 diabetes risk study of a normal schoolchild population: association of beta-cell autoantibodies and human leukocyte antigen-DQB1 alleles in antibody-positive individuals.
abstract: The intent of this study was to analyze the prevalence of diabetes-associated autoantibodies (AAbs) at or above the 99(th) percentile as well as their association with human leukocyte antigen (HLA)-DQB1 alleles in a normal population of 6,337 schoolchildren. AAbs against glutamic acid decarboxylase (GADA), tyrosine phosphatase IA-2 (IA-2A), and/or insulin (IAA) were detected by (125)I-antigen binding and islet cell antibodies (ICA) immunohistochemically in 181 (2.86%) schoolchildren. HLA-DQB1 alleles were analyzed in 178/181 children and subsequently compared with 119 controls. 2.37% (150/6,337) possessed only one AAb, whereas 0.49% (31/6,337) had multiple AAbs but at increased levels (P < 0.001). Subjects with GADA, IA-2A, or IAA revealed an increased frequency of the diabetes-associated HLA-DQB1 alleles *0302 and/or *02 (P = 0.001-0.006) as well as a decreased frequency in the protective allele *0602 (P < 0.001-0.022). DQB1*0602 was completely absent within children with multiple AAbs or with GADA, IA2-A, or IAA at or above the 99.9(th) percentile. In comparison to children with single AAbs, the frequency of associated/protective alleles of children with multiple AAbs was enhanced/diminished (P = 0.004-0.009). The study shows that also in the general population the multiple AAbs or high level single AAbs predict rather certainly a HLA-DQB1-mediated diabetes susceptibility as shown for first degree relatives of type 1 diabetic patients.
authors: Institute of Pathophysiology, Ernst Moritz Arndt University of Greifswald, Karlsburg D-17495, Germany.
authors: Michael
authors: M
authors: Schlosser
authors: Martina
authors: M
authors: Strebelow
authors: Ralf
authors: R
authors: Wassmuth
authors: Marie-Luise
authors: ML
authors: Arnold
authors: Isabel
authors: I
authors: Breunig
authors: Ilona
authors: I
authors: Rjasanowski
authors: Brigitte
authors: B
authors: Ziegler
authors: Manfred
authors: M
authors: Ziegler
mesh_terms: D000328:Adult; D000483:Alleles; D001323:Autoantibodies / Q000032:analysis*; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000209:etiology / Q000235:genetics* / Q000276:immunology*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D006683:HLA-DQ Antigens / Q000235:genetics*; D059866:HLA-DQ beta-Chains; D006801:Humans; D007515:Islets of Langerhans / Q000276:immunology*; D008297:Male; D011237:Predictive Value of Tests; D012016:Reference Values; D012307:Risk Factors
chemical_list: D001323:Autoantibodies; D006683:HLA-DQ Antigens; D059866:HLA-DQ beta-Chains; C069051:HLA-DQB1 antigen