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Allelic Variant, I50, Acts as a Gain-of-Function Variant Relative to V50 for Stat6, But Not Th2 Differentiation1
Department of Microbiology and Immunology, Vanderbilt University Medical School, Nashville, TN 37232
Signaling through the IL-4R 
-chain (IL-4R) is crucial for the development of Th2 cells, central effectors in atopic disease. Alleles of the IL-4R have been identified that have been variably associated with increased incidence of allergic disease, but there is little direct evidence that any variant is sufficient to alter a target that determines allergic pathophysiology or susceptibility. Variants of IL-4R encoding isoleucine instead of valine at position 50 (I50 vs V50, respectively) can signal increased Stat6-dependent transcriptional activity, whether in an I50, Q551 or I50, R551 haplotype. Strikingly, signaling through these receptors did not increase the efficiency of Th2 development or the IL-4 mediated repression of Th1 development or a target gene, IL-18R. Further, IL-4-induced proliferation was similar for Th2 cells independent of the variant expressed. Together these findings indicate that IL-4R variants that exhibit gain-of-function with respect to Stat6 do not act directly through alterations in Th2/Th1 induction after Ag exposure. The data further suggest that for such variants, any mechanistic involvement is based on a role in cellular targets of Th2 cytokines.
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