白细胞介素4和受体基因多态性与儿童变应性哮喘的相关分析

目的：探讨白细胞介素4(IL-4)及受体(IL-4R)基因多态性与儿童变应性哮喘易感性及与血浆总IgE的关系。方法： 采用聚合酶链反应-限制性酶切多态性方法检测IL-4基因启动子区-589位和IL-4R α亚单位Q576R两位点基因多态性，并观察对血浆总IgE的影响。结果：(1)白细胞介素-4基因-589基因多态性与儿童支气管哮喘无相关关系；(2)IL-4受体 α亚单位RR基因型和R 576等位基因频率在儿童支气管哮喘与对照组相比差异显著(P＜0.01，P＜0.01)，且R 576与高IgE相关。结论： 这些数据表明IL-4R α亚单位R 576是中国汉族变应性哮喘患儿的危险因子，且与高IgE相关。

Polymorphisms in IL-4 and IL-4R genes in children with allergic asthma

AIM: To determine whether interleukin 4 and interleukin 4 receptor α chain are associated with allergic asthma in children and to study the impact of such polymorphism upon plasma IgE.METHODS: Two polymorphism sites of IL-4 and IL-4R were studied by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).RESULTS: (1)The results showed that the IL-4 promoter -589 was not associated with children allergic asthma, however, the IL-4R α chain 576RR genotype and R allele were significantly increased in the subjects with asthma in children compared with age-matched control subjects (χ2=11.84, P＜0.01; χ2=13.03, P＜0.01). The IL-4R α chain 576RR genotype was associated with higher plasma IgE. CONCLUSION: These date suggest that the IL-4R α chain R576 is a risk factor of allergic asthma in children in Chinese, and is also related with higher plasma IgE level.