SCN1A and Febrile seizure (within the age range of 3 months to 6 years): If the sodium voltage-gated channel alpha subunit 1 (SCN1A) gene, which encodes Nav1.1 protein, undergoes pathological mutation, it results in a wide range of epileptic syndrome, including febrile seizure, genetic epilepsy with febrile seizure plus (GEFS+), and developmental and epileptic encephalopathy (DEE), including Dravet syndrome.