FES

FES encodes a non-receptor tyrosine kinase that is the cellular homolog of v-fes, the transforming gene of feline sarcoma viruses, and is the prototypical member of the Fer family. FES contains an N-terminal F-BAR coiled-coil, an SH2 domain and a kinase domain, and is activated by cytokine receptors such as those for IL-3, IL-4, GM-CSF and erythropoietin. It is predominantly expressed in myeloid cells, where it promotes terminal granulocytic differentiation and contributes to innate immunity and vascular remodeling. Unlike v-FES, cellular FES suppresses transformation in many models and can function as a tumor suppressor, with reduced expression documented in colorectal and other cancers.