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  • Title: HLA and GM in insulin-dependent diabetes in the Netherlands: report on a combined multiplex family and population study.
    Author: de Jongh BM, Bruining GJ, Schreuder GM, Schuurman RK, Radder JK, van Loghem E, Meera Khan P, Hauptmann G, van Rood JJ.
    Journal: Hum Immunol; 1984 May; 10(1):5-21. PubMed ID: 6586708.
    Abstract:
    This report deals with the genetic factors involved in insulin-dependent diabetes mellitus (IDD) in The Netherlands. Twenty-two Dutch multiplex families with IDD were typed for HLA-A, -B, -C, and -DR antigens, for BF, C2, C4, and GLO polymorphisms, as well as for GM allotypes of immunoglobulins. In addition, 53 unrelated IDD children and 31 unrelated patients with adult onset IDD were typed for HLA-A, -B, -C, and -DR antigens. A significant heterogeneity for the frequency of HLA-DR4 related to age of onset was observed. A significant deviation of the Hardy-Weinberg equilibrium was observed for the HLA-DR locus with an excess in patients of heterozygotes HLA-DR3, -DR4.HLA-B8, and HLA-B15 were not only secondary associated, but constituted with HLA-DR3 and -DR4, respectively, a haplotype in association with IDD. Nonrandom segregation of HLA-haplotypes was observed in multiplex families exemplified by an excess of HLA-identical affected sibpairs . Cross- overs between HLA-DR and GLO identified the HLA-DR segment as mainly involved in the association with IDD. Three diabetic haplotypes were confirmed to occur frequently among affected sibs: (a) A1, B8, BFS, C2.1, C4AQO , C4B1 ,DR3, GLO2 ; (b) Aw30, Cw5 ,B18,BFF1,C2.1, C4A3 , C4BQO ,DR3, GLO2 ; (c) A2,Cw3, B15,BFS, C2.1, C4A3 , C4B3 , DR4,GLO1. The segregation of GM allotypes to affected sibpairs was not significantly different from random segregation. The main conclusions from this study are that significant heterogeneity for age of onset exists and that the data are not compatible with simple genetic models including dominant, recessive, and intermediate models of inheritance. The data do require more complex models, involving two different HLA-linked (sets of) susceptibility genes.
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