Potential pathogenic genes for epilepsy include ion channel genes (e.g., SCN1A, KCNQ2, SCN2A, and SCN8A), which account for nearly half of epilepsy genes, together with a number of additional genes, such as CDKL5, STXBP1, PCDH19, PRRT2, LGI1, ALDH7A1, MECP2, EPM2A, ARX, and SLC2A1 [267]. Here, PCDH19 is linked to epilepsy.