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APCs of the nonobese diabetic (NOD) mouse have a genetically programmed capacity to overexpress IL-12p40, a cytokine critical for development of pathogenic autoreactive Th1 cells. To determine whether a diabetes-associated NOD chromosomal locus (i.e., Idd) was responsible for this defect, LPS-stimulated macrophages from several recombinant congenic inbred mice with Idd loci on a C57BL/6 background or with different combinations of NOD and CBA genomic segments were screened for IL-12p40 production. Only macrophages from the congenic strains containing the Idd4 locus showed IL-12p40 overproduction/expression. Moreover, analysis of IL-12p40 sequence polymorphisms demonstrated that the Idd4 intervals in these strains contained the IL-12p40 allele of the NOD, although further analysis is required to determine whether the IL-12p40 allele itself is responsible for its overexpression. Thus, the non-MHC-associated Idd4 locus appears responsible for IL-12p40 overexpression, which may be a predisposing factor for type 1 diabetes in NOD mice.

the journal of immunology/the journal of immunology

Cutting Edge: Diabetes-Associated Quantitative Trait Locus, <i>Idd4</i>, Is Responsible for the <i>IL-12p40</i> Overexpression Defect in Nonobese Diabetic (NOD) Mice

Cutting Edge: Diabetes-Associated Quantitative Trait Locus, Idd4, Is Responsible for the IL-12p40 Overexpression Defect in Nonobese Diabetic (NOD) Mice