A common haplotype of the IL-31 gene influencing gene expression is associated with nonatopic eczema

BackgroundIL-31 is a novel cytokine that, when overexpressed in transgenic mice, induces severe itching dermatitis resembling human eczema.ObjectiveWe aimed to evaluate the importance of polymorphisms in the human IL-31 gene (IL31) in the genetic susceptibility to eczema.MethodsWe sequenced the entire IL-31 gene, including the promoter region, and determined the haplotype structure. Single nucleotide polymorphisms tagging the main haplotypes were genotyped in 3 independent European populations comprising 690 affected families. An association analysis of IL31 gene variants with atopic and nonatopic eczema was performed.ResultsWe found significant association of a common IL31 haplotype with the nonatopic type of eczema in all 3 study populations (combined P = 4.5 × 10−5). Analysis of PBMCs in healthy individuals revealed a strong induction IL31 mRNA expression on stimulation with anti-CD3 and anti-CD28 that was 3.8-fold higher in individuals homozygous for the risk haplotype (AA) in contrast to non-A haplotype carriers, suggesting that altered regulation of IL-31 gene expression is the disease-causing factor.ConclusionOur results lend strong support to an important role of IL-31 in the pathogenesis of nonatopic eczema.Clinical implicationsThis study presents the first genetic risk factor for the nonatopic type of eczema and indicates a primary role of IL-31–induced pruritus in the initiation of this disease, thus proposing a new target for the prevention and therapy of eczema.