Atria-Enriched GJA5, KCNA5 and NPPA, RA-Enriched HCM4, MIR100HG, REC114 and SMAD7 and Ventricles-Enriched KCNJ2, MYH7, PHLDB2, RPL2L and SLC35F1 were associated with atrial fibrillation. The gene discussed is KCNJ2; the disease is atrial fibrillation.