Expression of SCN8A, NALCN, SATB2, TCF4 and STXBP1 was detected in fibroblasts, whereas expression of SCN8A, NALCN, KIF1A, PAK3, SATB2, TCF4, and STXBP1 was detected in AF cells (Fig. 2d). This evidence concerns the gene KIF1A and atrial fibrillation.