Leopard syndrome

LEOPARD syndrome is an autosomal dominant developmental disorder belonging to a relatively prevalent class of inherited RAS-MAPK signalling diseases. Its main features are lentigines, electrocardiographic abnormalities, ocular hypertelorism, pulmonary valve stenosis, abnormal genitalia, retardation of growth and deafness. Approximately 90% of LEOPARD syndrome cases are caused by missense mutations in the PTPN11 gene which encodes the protein tyrosine phosphatase SHP2. But it may also be caused by mutations in RAF1 or BRAF.