In 463 patients with selected arrhythmia syndromes, including AF (n = 10), atrioventricular block (AVB) (n = 20), BrS (n = 200), IVF (n = 125), PCCD (n = 49), right ventricular outflow tract tachycardia (RVOT, n = 35), and sinus node disease (SND, n = 24), we completely sequenced all coding exons and adjacent intronic sites of KCNK17. Here, we identified a total of 14 polymorphic nucleotide sites (Supplementary Fig S2); these were not further considered as disease-causing because of a benign pathogenicity prediction. The gene discussed is KCNK17; the disease is atrioventricular block.