Rett syndrome is a human neurodevelopmental disorder presenting almost exclusively in female infants; it is the second most common cause of mental retardation in girls, after Down's syndrome. The identification in 1999 that mutation of the methyl-CpG-binding protein 2 (MECP2) gene on the X chromosome causes Rett syndrome has led to a rapid increase in understanding of the neurobiological basis ...

Autism and autism spectrum disorders (ASDs) such as Rett syndrome and Asperger syndromeare enigmatic and complex neurodevelopmental disorders, thought to have originated inparticular interactions of genetic and environmental factors. Despite the extensive research,exact mechanism of pathogenesis is not still completely understood. ASDs are characterizedby deficits and abnormalities in communica...