PMID:15901674

Citation	Berset, TA, Hoier, EF and Hajnal, A (2005) The C. elegans homolog of the mammalian tumor suppressor Dep-1/Scc1 inhibits EGFR signaling to regulate binary cell fate decisions. Genes Dev. 19:1328-40
Abstract	Protein phosphorylation by kinases and the subsequent dephosphorylation by phosphatases are key mechanisms that regulate intracellular signal transduction during development. Here, we report the identification of the receptor protein tyrosine phosphatase DEP-1 as a negative regulator of the Caenorhabditis elegans EGF receptor. DEP-1 amplifies in the developing vulva and the excretory system the small differences in the amount of EGF signal received by equivalent precursor cells to achieve binary cell fate decisions. During vulval development, DEP-1 inhibits EGFR signaling in the secondary cell lineage in parallel with the NOTCH-mediated lateral inhibition, while EGFR signaling simultaneously down-regulates DEP-1 and NOTCH expression in the primary cell lineage. This regulatory network of inhibitors results in the full activation of the EGFR/RAS/MAPK pathway in the primary vulval cells and at the same time keeps the EGFR/RAS/MAPK pathway inactive in the adjacent secondary cells. Mammalian Dep-1/Scc1 functions as a tumor-suppressor gene in the intestinal epithelium. Thus, mutations in human Dep-1 may promote tumor formation through a hyperactivation of the EGF receptor.
Links	PubMed PMC1142556 Online version:10.1101/gad.333505
Keywords	Animals; Animals, Genetically Modified; Base Sequence; Caenorhabditis elegans/cytology; Caenorhabditis elegans/genetics; Caenorhabditis elegans/metabolism; Cell Cycle Proteins/genetics; Cell Cycle Proteins/physiology; Cell Lineage; Chromosomal Proteins, Non-Histone; DNA Primers; Green Fluorescent Proteins/genetics; Mutation; Nuclear Proteins; Phosphoproteins; Receptor, Epidermal Growth Factor/metabolism; Saccharomyces cerevisiae Proteins; Signal Transduction/physiology
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