This gene encodes a protein that is a guanine nucleotide exchange factor for RAS proteins, membrane proteins that bind guanine nucleotides and participate in signal transduction pathways. GTP binding activates and GTP hydrolysis inactivates RAS proteins. The product of this gene may regulate RAS proteins by facilitating the exchange of GTP for GDP. Mutations in this gene are associated with gingival fibromatosis 1 and Noonan syndrome type 4. [provided by RefSeq, Jul 2008]

  • MAPK cascade
  • B cell homeostasis
  • Hair follicle development
  • Lymphocyte homeostasis
  • Heart morphogenesis
  • Noonan syndrome 4
  • Fibromatosis, gingival, 1
  • Noonan syndrome 1
  • Gingival fibromatosis
  • Noonan syndrome and noonan-related syndrome

Emw. Structure of the SOS1 protein. Based on PyMOL rendering of PDB 1awe.

Gene Location