The causality between C-reactive protein and asthma: a two-sample Mendelian randomization analysis

孟德尔随机化 医学 优势比 单核苷酸多态性 哮喘 置信区间 多效性 全基因组关联研究 遗传学 内科学 基因 遗传变异 基因型 表型 生物
作者
Yong Mou,Wenhao Cao,Rujuan Wang,Xiaofan Liu,Xiuwen Yang,Jing Zhu
出处
期刊:Postgraduate Medical Journal [Oxford University Press]
卷期号:100 (1186): 555-561
标识
DOI:10.1093/postmj/qgae019
摘要

Abstract Purpose This study sought to investigate the causal effects of circulating C-reactive protein (CRP) level on risk of asthma and its subtypes by two-sample Mendelian randomization (MR) analysis. Methods We utilized single nucleotide polymorphisms (SNPs) associated with both CRP and outcomes of asthma, allergic asthma, and obesity-related asthma as genetic variables via a genome-wide summary association study (GWAS). MR analysis mainly based on the inverse variance weighted (IVW) method was performed to infer the causal relationship between exposure and outcomes. Cochran’s Q test and MR-Egger regression analysis were performed to determine respectively the heterogeneity and pleiotropy among instrumental variables (IVs), and leave-one-out analysis was conducted to determine the stability of the MR results. Results In our study, 42 SNPs were identified as IVs for MR analyses. According to the primary inference results by IVW methods, circulating CRP was demonstrated to be significantly associated with risk of asthma [odds ratio (OR): 1.046; 95% confidence interval (95% CI): 1.004–1.090; P = .030] and obesity-related asthma (OR: 1.072; 95% CI: 1.009–1.138; P = 0.025), whereas no distinct causality with allergic asthma was found (OR: 1.051; 95% CI: 0.994–1.112; P = .081). Sensitivity analyses indicated that there was no horizontal pleiotropy among IVs, and the MR results were proved to be robust by leave-one-out sensitivity analysis, despite the presence of heterogeneity. Conclusion The present study suggested that higher CRP might genetically predict an increased risk of developing asthma and obesity-related asthma, without causality with allergic asthma.
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