TSC1 and epilepsy: Of these 22 children, 10 were diagnosed with monogenic epilepsy in which the pathogenic genes were SCN1A (n = 4), KCNQ2 (n = 2), KCNT1 (n = 1), STXBP1 (n = 1), TSC1 (n = 1), and COL4A1 (n = 1).