T1 Meta-analysis of idiopathic pulmonary fibrosis genome-wide analyses identifies three novel genetic signals associated with disease susceptibility
THORAX(2019)
摘要
Introduction Idiopathic pulmonary fibrosis (IPF) is a devastating incurable lung disease. There have been three previous genome-wide association studies (GWAS) of IPF susceptibility. By combining these studies, we were able to perform the largest, densest and most powerful GWAS of IPF to date. Methods We used a two-stage approach. Stage 1 consisted of a genome-wide meta-analysis of IPF across the three previous studies. European cases and controls in each of the studies was imputed using the Haplotype Reference Consortium (HRC) reference panel. We ran genome-wide analyses adjusting for 10 principal components (to adjust for fine-scale ancestry) in each study separately and meta-analysed the results. Variants with p Results GWAS were performed on 10,790,934 genetic variants in 2,668 IPF cases and 8,591 controls (stage 1) with replication in 1,467 IPF cases and 11,874 controls (stage 2). We identified three novel signals associated with IPF susceptibility. These three novel signals were associated with decreased expression of DEPTOR (in lung tissue), KIF15 and MAD1L1 (in non-lung tissue). We replicated 11 of the previously reported 17 IPF risk variants. The most significant risk score was found to include over 800,000 independent variants that were non-significant in our GWAS and explained about 2% of the phenotypic variation. Conclusion The novel signals support the importance of mTOR signalling and suggest a possible role of spindle-assembly genes in IPF susceptibility. Risk score analyses suggest there are potentially hundreds of genetic variants associated with IPF susceptibility that have not yet been identified by GWAS.
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