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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A point mutation in the extracellular domain of the human CSF-1 receptor (c-fms proto-oncogene product) activates its transforming potential.

A human CSF-1 receptor containing an "activating" mutation in its extracellular domain (serine for leucine 301) induced morphologic transformation, anchorage-independent growth, and tumorigenicity in mouse NIH 3T3 cells. A second regulatory mutation within the receptor's intracytoplasmic carboxy-terminal tail (phenylalanine for tyrosine 969) augmented transforming efficiency but was itself insufficient to induce transformation. Like the v-fms oncogene product, receptors bearing the activating mutation retained high-affinity binding sites for CSF-1 but were retarded in transport to the cell surface and were phosphorylated on tyrosine in the absence of ligand. Although the activating mutation does not affect the CSF-1 binding site in the receptor extracellular domain, it must induce a conformational change that mimics the effect of ligand binding, resulting in CSF-1-independent signals for cell growth.[1]


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