SCN1A and Febrile seizure (within the age range of 3 months to 6 years): The SCN1A gene has so far been well studied in large series of patients with severe myoclonic epilepsy [24–26] or in families with idiopathic generalized epilepsies and febrile seizures plus (GEFS+) [27, 28] and also in some families with febrile seizures [29].