IgE高亲和力受体β链基因与中国湖北成人变应性哮喘的关系

目的:探讨IgE高亲和力受体β链基因(FcεRⅠβ)启动子-109位和编码区Glu237Gly基因多态性与湖北成人变应性哮喘及血浆总IgE的关系。方法:采用聚合酶链反应-限制性片段长度多态性技术检测FcεRⅠβ基因启动子区-109位和编码区Glu237Gly两位点多态性,采用病例-对照法共研究106例成人变应性哮喘患者和106例相匹配的对照者。结果:①成人变应性哮喘患者FcεRⅠβ基因启动子区-109位T/T、T/C和C/C基因型频率是0.415、0.491和0.094;与对照相比差异无显著(χ²=0.5575,P＞0.05),但成人变应性哮喘组T/T基因型患者血浆总IgE对数值为2.6490±0.9241与T/C基因型的2.2960±1.1040和C/C基因型的2.3130±0.8052相比差异显著。②FcεRⅠβGlu237Gly位点Glu/Glu、Glu/Gly和Gly/Gly基因型频率为0.566、0.377和0.057,与正常对照相比差异显著(χ²=7.31,P＜0.05),Gly/Gly基因型血浆总IgE对数值为2.7220±0.9374,与Glu/Glu和Glu/Gly相比差异显著。结论:IgE高亲和力受体β链启动区-109位T/T基因型与血浆总IgE高度相关,编码区237位Gly/Gly基因型与湖北汉族成人变应性哮喘及血浆高IgE相关。

Association analysis of FcεRⅠβ gene with allergic asthma in Chinese

AIM: To investigate the linkage between the polymorphism of -109 and Glu237 in the high-affinity IgE receptorβ(FcεRⅠβ) gene and susceptibilty of allergic asthma in adults in a Chinese population. METHODS: Allergic asthma sample in adult and age-and sex-matched control were studied. A-109C/T and a coding variant Glu237Gly in FcεRⅠβ were detected with polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). RESULTS: (1)The genotype frequencies were 0.415 for -109T/T, 0.491 for-109T/C and 0.094 for -109C/C in allergic asthma in adults. No significant difference in the distribution of-109C/T polymorphism was found between allergic asthma adult subjects and healthy control subjects. However, a homozygosity for the-109T allele was associated with increased total plasma IgE levels in subjects with allergic asthma (F=7.213, P<0.01). (2)The allele frequency of Gly237 in the patients and control was 0.245 and 0.142, respectively. There was a significant association between Gly/Gly genotype and allergic asthma in adults among allergic asthma patients. Gly237 was significantly associated with high IgE. CONCLUSIONS: It suggests that Gly237 vaviant of the FcεRⅠβ gene is involved in the development of allergic asthma. The-109C/T and Glu237Gly polymorphisms are two of the genetic factors identified, which affects total plasma IgE levels in adult allergic asthma in Han of Hubei province.