Allergic rhinitis is a major public health problem and has seen its prevalence increase during the past few decades. Interleukin 13 (IL-13) has been implicated in the pathogenesis and in the regulation of immunoglobulin E (IgE) production. Single nucleotide polymorphisms (SNPs) have been found in both the coding sequence and the promoter region of IL-13, and such SNPs have been associated with allergic asthma. We have investigated whether IL-13 SNPs are associated with allergic rhinitis. Among 188 Chinese adult patients with allergic rhinitis and 87 normal controls, no significant difference was found in either allele or haplotype frequency of the SNPs between the two groups. Within patients, there was a significant association of the IL-13 Arg130Gln SNP, but not of the IL-13 promoter -1112(C/T) SNP, with serum total IgE levels. Patients with a Gln/Gln genotype showed much higher serum total IgE than those with an Arg/Arg genotype. When tested for serum-specific IgE, patients allergic to Derp 1, but not those allergic to Artemisia pollen, showed a significant association with the IL-13 promoter SNP. Thus, our results suggest a possible involvement of IL-13 SNPs in the regulation of IgE production in response to allergens in this Chinese population.
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