GLUL and cerebral malformation: Furthermore, genetic mutations in GS gene (GLUL) have been found in epileptic patients: two GLUL congenital homozygous mutations occurring at GS active sites have been identified in two unrelated newborns, one of them displaying severe brain malformations, almost no EEG activity except short theta bursts and generalized seizures (Haber et al., 2006, Häberle et al., 2005).