Polymorphisms of IL-4, IL-4Rα, and AICDA Genes in Adult Allergic Asthma

The relationship between 3 polymorphisms sites [interleulin-4 (IL-4), IL-4 receptor (IL-4R)α chain and activation-induced cytidine deaminase (AICDA)] and adult allergic asthma in Chinawas studied. By using case-control method, DNA and clinical data were obtained from allergic asth-matic patients and compared with those in the control subjects. The subjects were genotyped for theIL-4 C-589T promoter polymorphism, the IL-4R α chain Q576R and the AICDA C8408T by poly-merase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. The resultsshowed that the IL-4 C-589T was not associated with adult allergic asthma in China. However, theIL-4R α chain 576R/R and AICDA 8408T/T frequency was significantly increased in allergic asthmagroup as compared with that in the control group [odd ratio (OR) =3.797 and 9.127, respectively;P<0.01)] and was correlated with the increased plasma total IgE. These data suggested that theIL-4R α chain 576R/R and AICDA 8408T/T genotypes confer genetic suscept