Genetic central nervous system malformation

Genetic central nervous system (CNS) malformation is a broad grouping term used in Orphanet (ORPHA:183506) to classify a heterogeneous collection of rare congenital structural abnormalities of the brain and/or spinal cord that arise due to underlying genetic causes. These malformations result from disruptions in the complex processes of neural tube closure, neuronal proliferation, neuronal migration, cortical organization, or cerebellar and brainstem development. They encompass a wide spectrum of conditions including, but not limited to, holoprosencephaly, lissencephaly, polymicrogyria, schizencephaly, corpus callosum agenesis, cerebellar malformations, and various forms of neural tube defects with a genetic basis. Clinical features vary considerably depending on the specific malformation but commonly include intellectual disability, developmental delay, seizures or epilepsy, motor impairment (including spasticity and hypotonia), microcephaly or macrocephaly, and in some cases hydrocephalus. Cranial nerve dysfunction, visual impairment, and feeding difficulties may also be present. The severity ranges from mild learning difficulties to profound neurological disability incompatible with independent life. Because this is a classification category rather than a single disease entity, the underlying genetic causes are extremely diverse, involving numerous genes and inheritance patterns including autosomal dominant, autosomal recessive, X-linked, and de novo mutations. Treatment is largely supportive and symptomatic, including antiepileptic medications for seizure management, physical and occupational therapy, surgical interventions for hydrocephalus (such as ventriculoperitoneal shunting), and multidisciplinary rehabilitation. Genetic counseling is recommended for affected families. No curative therapies currently exist for most genetic CNS malformations.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

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