白细胞介素-4受体基因多态性及IgE水平与哮喘预测指数相关性研究

目的研究新疆维吾尔自治区儿童白细胞介素-4受体(IL-4R)基因多态性及Ig E水平与哮喘预测指数(API)的相关性。方法选取167例API(+)、187例API(-)及203例健康婴幼儿(对照组),应用PCR聚合酶链反应和DNA测序法进行基因分型。同时ELISA法检测三组婴幼儿血清Ig E水平。结果 IL-4R基因Arg551Gln位点各基因型频率分布在API(+)组、API(-)组、对照组三组中差异无统计学意义(P0.05);API(+)组血清Ig E水平明显高于API(-)及对照组(P0.01);API(+)患儿中2岁者血清Ig E水平明显低于≥2岁者(P0.01)。结论 Arg551Gln位点多态性与API结果无相关性,而API阳性与Ig E水平升高存在关联性,年龄≥2岁是API阳性的儿童Ig E水平升高的风险因素。

Correlations of IL-4R gene polymorphism and serum IgE levels with asthma predictive index

Objective To study the correlations of IL-4R gene polymorphism and serum IgE levels with asthma predictive index (API) in children. Methods One hundred and sixty-seven children with positive API, 187 children with negative API and 203 healthy children (control group) were enrolled. PCR and DNA sequencing were used to identify genotypes of the Arg551Gln locus in IL-4R gene. Serum IgE levels were measured using ELISA. Results There was no significant difference in the genotype frequencies of the Arg551Gln locus in IL-4R gene among the positive API, negative API and control groups. Serum IgE levels in the positive API group were significantly higher than in the negative API and control groups (P<0.01). In the positive API group, the children aged less than 2 years had significantly lower serum IgE levels than those aged over 2 years (P<0.01). Conclusions There is no correlation between the Arg551Gln polymorphism in IL-4R gene and API results. API positivity is correlated with elevated serum IgE levels. An older age (>2 years) may be a risk factor for increased serum IgE levels in children with positive API.