一项多中心的大规模哮喘全基因组相关性研究

2011-04-05 MedSci原创 MedSci原创

MedSci评价:这是一项大规模临床研究,采取通过全基因组研究(GWAS),这是近年来研究热点,有助于对某种疾病的遗传背景进行基因组学水平的分析。   背景 对哮喘的易感性受基因和环境的影响,所涉及的基因有可能提示治疗性干预的途径。遗传危险因素有可能对识别哮喘亚型,以及确定中间表型(如总血清IgE水平升高)是否与疾病存在因果关系有用。   方法 我们在10365例被内科医师诊断为哮喘的病人和

MedSci评价:这是一项大规模临床研究,采取通过全基因组研究(GWAS),这是近年来研究热点,有助于对某种疾病的遗传背景进行基因组学水平的分析。

  背景 对哮喘的易感性受基因和环境的影响,所涉及的基因有可能提示治疗性干预的途径。遗传危险因素有可能对识别哮喘亚型,以及确定中间表型(如总血清IgE水平升高)是否与疾病存在因果关系有用。

  方法 我们在10365例被内科医师诊断为哮喘的病人和16110名无哮喘者中,用基因型分析法进行了一项全基因组相关性研究,所有受试者都接受了血统配对。我们采用随机效应汇总分析,在总体研究人群中以及在有儿童期发病的哮喘(定义为16岁前发生的哮喘)、迟发性哮喘、严重哮喘和职业性哮喘的受试者亚组中,检验了相关性。

  结果 我们在哮喘与下列单核苷酸多态性之间,观察到了显著的全基因组相关性:染色体2上的rs3771166,涉及 IL1RL1/IL18R1(P=3×10-9);染色体6上的rs9273349,涉及HLA-DQ(P = 7×10-14);染色体9上的rs1342326,IL33的侧翼序列(P = 9×10-10);染色体15上SMAD3中的rs744910(P = 4×10-9);以及染色体22上IL2RB中的rs2284033(P = 1.1×10-8)。与染色体17q21上ORMDL3/GSDMB基因座的相关性,是儿童期发病的哮喘特有的(rs2305480,P = 6×10-23)。仅HLA-DR显示与总血清IgE浓度有显著的全基因组相关性,而且与IgE水平强相关的基因座与哮喘不相关。

  结论 哮喘具有遗传异质性。少数共有等位基因在各年龄段都与疾病的危险相关。所涉及的基因提示,它们在上皮损伤与获得性免疫系统和气道炎症活化之间,起一种联络的作用。ORMDL3/GSDMB基因座的变异仅与儿童期发病的哮喘相关。总血清IgE水平升高在哮喘发病中起次要作用。

原始文献:

Moffatt MF, Gut IG, Demenais F, Strachan DP, Bouzigon E, Heath S, von Mutius E, Farrall M, Lathrop M, Cookson WO; GABRIEL Consortium. A large-scale, consortium-based genomewide association study of asthma. N Engl J Med 2010;363:1211-21. PMID: 20860503.

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    2011-08-04 ylz8403
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