Prader-Willi Syndrome Due to Paternal Deletion of 15q11q13 Type 1 is related to precocious puberty, central, 2 and pervasive developmental disorder. An important gene associated with Prader-Willi Syndrome Due to Paternal Deletion of 15q11q13 Type 1 is MAGEL2 (MAGE Family Member L2), and among its related pathways/superpathways is Prader-Willi and Angelman syndrome. Affiliated tissues include pituitary and skin, and related phenotypes are feeding difficulties in infancy and cryptorchidism