Background: The developmental and epileptic encephalopathy (DEE) diseases where there is impairment related to both the underlying etiology independent of epileptiform activity encephalopathy. Many DEEs have a genetic basis that, by themselves, can alter neurodevelopmental delay. By August 2022, were 105 genes associated with DEE according OMIM.

Rett syndrome (RTT, MIM #312750) is a neurodevelopmental disorder defined by a distinct set of clinical features, notably a regression that robs the affected individuals of spoken language and volitional hand use [1]. Additionally, affected people develop characteristic hand stereotypies that are classically wringing or washing in nature, although they make take on a variety of forms such as cl...

background the x-linked cyclin-dependent kinase like 5 (cdkl5/stk9) gene has been shown to be responsible for a severe encephalopathy condition characterized by early onset of epilepsy and severe developmental delay. cdkl5 mutations have been shown to be more frequent among female patients. results here we report a 6- month male patient, second child of a healthy non consanguineous in the irani...

SCN2A mutations are associated with a broad spectrum of neurological phenotypes ranging from neonatal or infantile seizures with normal development to epileptic encephalopathies with severe developmental delay. Recently, movement disorders in children with SCN2A mutations and epileptic encephalopathies including infantile spasms has been described [1,2]. We present a case of a typically develop...