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A semi-dominant X-linked disease with intellectual deficiency and seizures that is more severe in male patients. Boys presenting with lissencephaly show an abnormally thick cortex with very few gyri (pachygyria) or even none (agyria). Clinical manifestations include swallowing and feeding difficulties, abnormal muscular tone, seizures and severe to profound psychomotor retardation. Female patients display a less severe malformation referred to as \'\'doublecortex\'\' or subcortical laminar heterotopia and present with clinical signs of variable severity ranging from mild epilepsy to refractory epileptic seizures and severe intellectual deficiency. The condition is caused by doublecortin (DCX, located at Xq22.3-q23) gene mutations.
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