Definition of polymorphisms in the gene encoding the interleukin-12 receptor B1 subunit: testing linkage disequilibrium with Type I diabetes susceptibility.
The cytokine interleukin (IL)-12 is bound by a heterodimeric receptor and mediates a range of immunological activities, in particular, favouring the development of uncommitted T cells to the Th1 phenotype. Genes encoding elements of the IL-12 pathway are therefore good candidates for mediating susceptibility or resistance to a range of immune disorders, including Type I diabetes. We made a systematic search for variants in the human gene encoding the low-affinity IL-12 receptor, IL12RB1. Four single-nucleotide polymorphisms and two microsatellite polymorphisms were defined. We also tested these IL12RB1 alleles for involvement in Type I diabetes susceptibility, testing 131 families. Although suggestive evidence for linkage to a susceptibility gene was found, none of the IL12RB1 variants we defined demonstrated preferential transmission in these families.
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The Walter and Eliza Hall Institute of Medical Research, IG Royal Parade, Parville, Victoria, Australia.
Morahan
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D003922:Diabetes Mellitus, Type 1 / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006801:Humans; D015810:Linkage Disequilibrium; D011110:Polymorphism, Genetic; D018123:Receptors, Interleukin / Q000235:genetics*; D053707:Receptors, Interleukin-12
C508438:IL12RB1 protein, human; D018123:Receptors, Interleukin; D053707:Receptors, Interleukin-12