Pedigree of the family bearing the p.Thr1708Asn mutation. Circles indicate females, squares, males. Symbols with diagonal lines represent deceased individuals. Open symbols represent asymptomatic individuals, filled symbols are affected by arrhythmogenic syndromes according to the color code. Case 6 (V-3) and case 7 (IV-13) were initially thought to be unrelated, but after thorough interrogation were found to be first cousins once removed. Individual III-4 suffered sudden cardiac death at age 39 years, III-5 at age 56 years; and IV-15 at age 6 years. p.Thr1708Asn heterozygous individuals III-6, IV-6, IV-8, and V-5 had minor ECG manifestations, including prolonged PR and/or prolonged QTc intervals. SSS: sick sinus syndrome; PCCD: progressive cardiac conduction disease; VT: ventricular tachycardia; BrS: Brugada syndrome; LQTS: long QT syndrome; SCD: sudden cardiac death.