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Disease with characteristics of recurrent seizures, encephalopathy and intellectual disability with onset of symptoms typically beginning in infancy. Seizures may be refractory and intellectual disability may be mild to severe. Sudden unexpected death in epilepsy may occur in rare cases. The disease is caused by mutations in the SCN8A gene, which provides instructions for making the alpha subunit of Nav1.6. Follows an autosomal dominant pattern of inheritance however most cases of this condition result from de novo mutation.
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