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The clinical features of severe myoclonic epilepsy of infancy (SMEI) resemble those of mitochondrial diseases, although most patients have the sodium channel (SCN1A) mutation. We describe a patient with SMEI and enlarged muscle mitochondria associated with mutations in mitochondrial polymerase gamma 1 (POLG1) and SCN1A. Due to increased risk of valproate-induced liver failure in patients with POLG1...
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