Atrial fibrillation (AF) affects more than 33 million individuals worldwide1 and has a complex heritability2. We conducted the largest meta-analysis of genome-wide association studies (GWAS) for AF to date, consisting of more than half a million individuals, including 65,446 with AF. In total, we identified 97 loci significantly associated with AF, including 67 that were novel in a combined-ancestry analysis, and 3 that were novel in a European-specific analysis. We sought to identify AF-associated genes at the GWAS loci by performing RNA-sequencing and expression quantitative trait locus analyses in 101 left atrial samples, the most relevant tissue for AF. We also performed transcriptome-wide analyses that identified 57 AF-associated genes, 42 of which overlap with GWAS loci. The identified loci implicate genes enriched within cardiac developmental, electrophysiological, contractile and structural pathways. These results extend our understanding of the biological pathways underlying AF and may facilitate the development of therapeutics for AF.
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A full list of acknowledgments appears in the Supplementary Notes.
Integrated Supplementary Information
Quantile–quantile plot of combined ancestry meta-analysis for n = 12,149,979 included variants and λGC = 1.0948.
Supplementary Figure 2 Venn diagram for genes near sentinel variants from combined ancestry meta-analysis within enriched gene sets, by functional groups.
The Venn diagram shows genes that are within enriched gene set from the gene set enrichment analysis and within 500 kb of a sentinel variant. The genes were manually grouped into functional categories based on their corresponding gene sets. The diagram shows the overlap between the genes and the functional categories.
The plot shows novel (red and purple) and known (blue) genetic loci associated with AF at a significance level of P < 1 × 10–8 (dotted line) for the European-ancestry meta-analysis (n = 537,409). The significance level accounts for multiple testing of independent variants with MAF ≥0.1% using a Bonferroni correction. P values (two-sided) were derived from a meta-analysis using a fixed-effects model with an inverse-variance-weighted approach. Loci in purple did not reach genome-wide significance in the combined ancestry meta-analysis. Gene labels correspond to the nearest gene(s). The y axis has a break between –log10 (P) of 25 and 400 to emphasize the novel loci.
Quantile–quantile plot of European-ancestry meta-analysis for n = 9,362,422 included variants and λGC = 1.1194.
The plot shows known (blue) genetic loci associated with AF at a significance level of P < 1 × 10–8 (dotted line), for the African-American-ancestry meta-analysis (n = 8,967). The significance level accounts for multiple testing of independent variants with MAF ≥ 0.1% using a Bonferroni correction. P values (two-sided) were derived from a meta-analysis using a fixed-effects model with an inverse-variance-weighted approach. The gene label corresponds to the nearest gene.
Quantile–quantile plot of African-American-ancestry meta-analysis for n = 8,640,046 included variants and λGC = 0.997.
Supplementary Figure 7 Regional plots for 4q25 for European, Japanese and African American ancestry and pairwise LD between sentinel variants at 4q25.
a–c, Regional plots of 4q25 for European-ancestry results (a, n = 537,409), Japanese-ancestry results (b, n = 36,792) and African-American-ancestry results (c, n = 8,967). LD is shown based on the 1000 Genomes phase 1 v3 reference, using the populations EUR (a), ASN (b) and AFR (c). d, Pairwise LD (r2) for the sentinel variants based on the LD from the 1000 Genomes phase 1 v3 reference for EUR (n = 379), ASN (n = 286) and AFR (n = 246) ancestry. 1000G, 1000 Genomes; AA, African American; AFR, African; ASN, Asian; EUR, European; JAP, Japanese; LD, linkage disequilibrium.
Supplementary Figure 8 Forest plots of odds ratios, and allele frequency plots, by ancestry for sentinel variants with significant heterogeneity.
a–c, Forest plots of odds ratios and pie charts of allele frequencies across ancestries (EUR, n = 537,409; JAP, n = 36,792; AA, n = 8,967; BRAZ, n = 1,664; HISP, n = 3,358) for sentinel variants with significant heterogeneity, close to PITX2 (a), NEURL (b) and ZFHX3 (c). Shown are odds ratios with 95% confidence intervals. Frequencies of the effect allele are depicted in blue; frequencies of the reference allele are depicted in orange. AA, African American; BRAZ, Brazilian; EUR, European; HISP, Hispanic; JAP, Japanese.
Supplementary Figure 9 Enrichment of atrial fibrillation–associated loci across ChromHMM regulatory regions.
a,b, Percent overlap of loci with regulatory regions (promoter, enhancer, DNase) based on the Roadmap Epigenomics Consortium 25-state model across all tissues (a) and cardiac tissues (b). Each locus includes sentinel variant and proxies with r2 > 0.6. The P values were derived from one-tailed permutation tests (n = 1,000). 1000 Genomes control loci were matched to atrial fibrillation sentinel SNPs via SNPSnap (n = 93,000). Atrial fibrillation–associated loci are from the combined ancestry analysis (n = 93). The sentinel SNP for one AF locus could not be matched in SNPSnap and was excluded from this analysis. The box plot depicts the following values: the center represents the median, the top and bottom of the box represent the first and third quartile, the whiskers reach to 1.5 times the interquartile range, and data points outside the whiskers are plotted as outliers. *P = 0.001. 1000G, 1000 Genomes; AF, atrial fibrillation.
Supplementary Figures 1–9, Supplementary Tables 1, 2, 6, 8, 10 and 19–22, and Supplementary Notes
Known loci in combined ancestry meta-analysis
Gene set enrichment analysis results for combined ancestry meta-analysis
Novel and known loci in ancestry-specific meta-analyses
Loci with multiple signals identified by conditional and joint analysis for European-ancestry meta-analysis
Chromatin states for sentinel variants and proxies from Roadmap Epigenomics across all tissues and heart
Significant cis-eQTLs for sentinel variants from combined ancestry meta-analysis in GTEx heart tissues
Probable AF susceptibility genes for loci from combined ancestry meta-analysis
Transcriptome-wide results based on summary-level data from combined ancestry meta-analysis
Association to diseases and traits in NHGRI-EBI GWAS catalog for sentinel variants or proxies from combined ancestry meta-analysis
PheWAS results in UK Biobank for sentinel variants from combined ancestry meta-analysis
134 loci associated with atrial fibrillation
Baseline summary for GWAS
GWAS summary on genotyping, QC, imputation and analysis per study