SCN2A and epilepsy with myoclonic atonic seizures: Recent studies have identified mutations in several genes, including SCN1A, SCN2A, SCN1B, STX1B, SLC2A1, GABRG2, CHD2, SYNGAP1, KIAA2022, NEXMIF, and SLC6A1, that can contribute to the phenotype of Doose syndrome (13–15).