Seldom, SCN1A variants are also associated with other forms of DEE, including myoclonic–astatic epilepsy (MAE, Doose syndrome), Infantile epilepsy with migratory focal seizures (EIMFS), West syndrome (WS) and Lennox–Gastaut syndrome (LGS) [5]. This evidence concerns the gene SCN1A and developmental and epileptic encephalopathy.