IgE高亲和力受体β链基因多态性与湖北汉族人变应性哮喘易感性的研究

目的探讨IgE高亲和力受体β链( high-affinity IgE receptor β gene, Fc ε RI β)基因启动子-109位C/T和编码区Glu237Gly基因多态性与湖北汉族人变应性哮喘易感性及血浆总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 Fc ε RI β基因启动子区-109位和编码区Glu237Gly两位点多态性,采用病例-对照法研究了216例变应性哮喘患者和198名对照. 结果 (1)湖北汉族人变应性哮喘患者 Fc ε RI β基因启动子区-109位T/T、T/C和C/C基因型频率是0.403、0.491和0.106;与对照相比差异无显著性(χ2=0.384,P＞0.05),但变应性哮喘组T/T基因型患者血浆总IgE对数值(2.539±0.8325)与T/C基因型的对数值(2.278±1.089)和C/C基因型的对数值(2.323±0.7852)相比差异具有显著性.(2)变应性哮喘患者 Fc ε RI β基因Glu237Gly位点Glu/Glu、Glu/Gly和Gly/Gly基因型频率为0.579、0.370和0.051,与正常对照相比差异具有显著性(χ2=13.62,P＜0.01),变应性哮喘患者Gly/Gly基因型血浆总IgE对数值为(2.622±0.9374),与Glu/Glu和Glu/Gly相比差异具有显著性. 结论 Fc ε RI β基因启动子区-109位T/T基因型与血浆总IgE高度相关,编码区237位Gly/Gly基因型与中国湖北汉族人变应性哮喘及血浆高IgE相关.

Study on the high-affinity IgE receptor β gene polymorphism and its association with the susceptibility to allergic asthma in Han nationality of Hubei province

OBJECTIVE: To determine whether 2 polymorphism sites of the high-affinity IgE receptor beta (Fc epsilon RI beta) gene were associated with allergic asthma in Han nationality of Hubei province in China. METHODS: DNA and clinical data were obtained from allergic asthma patients and were compared with those from a group of healthy control subjects. The subjects were genotyped for the -109C/T and a coding variant Glu237Gly in Fc epsilon RI beta gene by polymerase chain reaction-restriction fragment length polymorphism. RESULTS: (1) The genotype frequencies were 0.403 for -109T/T, 0.491 for -109T/C and 0.106 for -109C/C in allergic asthma patients in a Chinese population. No significant difference in the distribution of -109C/T polymorphism was found between allergic asthma patients and healthy control subjects; however, a homozygosity for the -109T allele was associated with increased total plasma IgE levels in patients with allergic asthma (F=7.523, P<0.01). (2) The frequency of Gly237Gly genotype was 0.051 in patient group, and 0.020 in control group. The allele frequencies of Gly237 in the patients and control were 0.236 and 0.136 respectively. There was a significant association between Gly/Gly genotype and allergic asthma. Among allergic asthma patients Gly237Gly was significantly associated with high IgE. CONCLUSION: These data suggested that the Gly237Gly genotype of the Fc epsilon RI beta gene conferred genetic susceptibility to allergic asthma in Chinese, which affected the total plasma IgE levels in the allergic asthma patients. And a homozygosity for the -109T allele was associated with increased total plasma IgE.