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

Activated EGL-15 FGF receptor promotes protein degradation in muscles of Caenorhabditis elegans.

Signaling by fibroblast growth factors (FGFs) and their receptors has been previously implicated in control of cell proliferation, differentiation and migration. Here we report a novel role for signaling by the EGL-15 FGFR of Caenorhabditis elegans in controlling protein degradation in differentiated muscle. Activation of EGL-15, by means of a reduction of function mutation (clr-1) affecting an inhibitory phosphatase, triggers protein degradation in adult muscle cells using a pre-existing proteolytic system. This activation is not suppressed by mutation in either of the known genes encoding FGF ligands (egl-17 or let-756) but is well suppressed when both are mutated, indicating that either ligand is sufficient and at least one is necessary for FGFR activation. Activity of the Ras pathway through mitogen-activated protein kinase (MAPK) is required to trigger protein degradation. This is the first report that degradation of intracellular protein can be triggered by a growth factor receptor using an identified signal transduction pathway. The data raise the possibility that FGF-triggered proteolysis may be relevant to muscle remodeling or dedifferentiation.[1]


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