Schaaf-Yang Syndrome, also known as prader-willi-like syndrome, is related to hypotonia and autism spectrum disorder, and has symptoms including constipation An important gene associated with Schaaf-Yang Syndrome is MAGEL2 (MAGE Family Member L2), and among its related pathways/superpathways are Prader-Willi and Angelman syndrome and p75(NTR)-mediated signaling. Affiliated tissues include pituitary and eye, and related phenotypes are intellectual disability and abnormal facial shape