DCX and lissencephaly spectrum disorders: Pathogenic variants of the DCX gene, together with LIS1 and tubulin genes, are the major causes of the “lissencephaly (LIS) spectrum”, a group of malformations of cortical Development (MCD) with epileptic seizures and a various range of intellectual disability caused by impaired neuronal migration in the early stages of embryonic development [6,7,8].