Susceptibility to insulin-dependent diabetes mellitus maps to a locus (IDDM11) on human chromosome 14q24.3-q31

L L FieldS Plon


To locate genes predisposing to insulin-dependent diabetes mellitus (IDDM), an autoimmune disorder resulting from destruction of the insulin-producing pancreatic cells, we are testing linkage of IDDM susceptibility to polymorphic markers across the genome using families with two or more IDDM children. A new susceptibility locus (IDDM11) has been localized to chromosome 14q24.3-q31 by detection of significant linkage to microsatellite D14S67, using both maximum likelihood methods (LODmax = 4.0 at Theta = 0.20) and affected sib pair (ASP) methods (P = 1 x 10(-5)). This represents the strongest reported evidence for linkage to any IDDM locus outside the HLA region. The subset of families in which affected children did not show increased sharing of HLA genes (HLA sharing </= 50%) provided most of the support for D14S67 linkage (LODmax 4.6 at Theta = 0.12; ASP P < 5 x 10(-6)). There was significant linkage heterogeneity between the HLA-defined subsets of families (P = 0.009), suggesting that IDDM11 may be an important susceptibility locus in families lacking strong HLA region predisposition.


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