Tyrosine-protein phosphatase non-receptor type 11

PTPN11 encodes tyrosine-protein phosphatase non-receptor type 11, a protein that acts downstream of receptor and cytoplasmic tyrosine kinases to regulate signal transduction from the cell surface to the nucleus (UniProt: Q06124). It positively regulates MAPK signaling and dephosphorylates multiple substrates including GAB1, EGFR, ROCK2, and components of T-cell receptor signaling pathways, thereby modulating immune responses and developmental processes.

PTPN11 is implicated in several syndromic developmental disorders. Mutations cause Noonan syndrome 1, characterized by short stature, facial dysmorphic features, congenital heart defects, and variable intellectual deficits; LEOPARD syndrome 1, featuring lentigines and sensorineural deafness; and predisposition to juvenile myelomonocytic leukemia (UniProt: Q06124). The protein also associates with metachondromatosis, a skeletal disorder combining exostoses and enchondromas.

PTPN11 carries SFARI classification as a syndromic autism-associated gene (SFARI Cat S). This designation reflects its role in neurodevelopmental pathology, though the primary clinical manifestations in PTPN11-related disorders span cardiac, skeletal, hematologic, and intellectual domains alongside autism spectrum features in affected individuals.