Lissencephaly due to TUBA1A mutation

Lissencephaly due to TUBA1A mutation (also known as TUBA1A-related lissencephaly or tubulinopathy-related lissencephaly) is a rare congenital brain malformation disorder caused by mutations in the TUBA1A gene, which encodes the alpha-1A tubulin protein. This protein is a critical component of microtubules, which play an essential role in neuronal migration during brain development. When TUBA1A is disrupted, neurons fail to migrate properly to their correct positions in the cerebral cortex, resulting in a smooth or incompletely folded brain surface (lissencephaly) rather than the normal pattern of gyri and sulci. The spectrum of brain malformations can range from classic lissencephaly (agyria-pachygyria) to more complex malformations including cerebellar hypoplasia, corpus callosum dysgenesis, and abnormalities of the hippocampus and basal ganglia. The condition primarily affects the central nervous system and manifests in the neonatal or early infantile period. Key clinical features include severe intellectual disability, intractable epilepsy (often with infantile spasms), significant motor impairment including spastic quadriplegia, microcephaly, and feeding difficulties. Many affected children have limited or absent speech development and require lifelong supportive care. The severity of symptoms generally correlates with the degree of cortical malformation observed on brain MRI. There is currently no cure or disease-modifying treatment for lissencephaly due to TUBA1A mutation. Management is supportive and symptomatic, focusing on seizure control with antiepileptic medications, physical and occupational therapy to optimize motor function, nutritional support (which may include gastrostomy tube placement for feeding difficulties), and management of respiratory complications. A multidisciplinary team approach involving neurologists, geneticists, developmental pediatricians, and rehabilitation specialists is essential for optimizing quality of life.

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