CAV1 and atrial fibrillation: Atrial fibrillation GWAS signals are associated with transcriptional profiles in vCM3, owing to higher mean expression of CAV1, CAV2 and PRRX1. PR interval GWAS signals are associated with vCM3 and aCM5, with high expression of SCN5A, CAV1, ARHGAP24, MEIS1, TBX5 and TTN. GWAS signals for QRS duration are associated with specific gene expression in NC2 (PRKCA, CEP85L, SLC35F1, SIPA1L1, KLF12 and FADS2).