Genetic variants of other genes, including GPD1L, SCN1B, SCN2B, SCN3B, RANGRF, SLMAP, KCNE3, KCNJ8, HCN4, KCNE5, KCND3, CACNA1C, CACNB2B, CACNA2D1, and TRPM4, may also underlie Brugada syndrome. Here, HCN4 is linked to Brugada syndrome.