Canevascini, S; Marti, M; Fröhli, E; Hajnal, A (2005). The Caenorhabditis elegans homologue of the proto-oncogene ect-2 positively regulates RAS signalling during vulval development. EMBO Reports, 6(12):1169-1175.
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Guanine nucleotide exchange factors (GEFs) regulate the activity of small GTP-binding proteins in a variety of biological processes. We have identified a gain-of-function mutation in the Caenorhabditis elegans GEF ect-2, the homologue of the mammalian ect2 proto-oncogene that has an essential role during cytokinesis. Here, we report that, in addition to its known function during mitosis, ECT-2 promotes the specification of the primary vulval cell fate by activating RAS/mitogen-activated protein kinase (MAPK) signalling before the end of the S-phase. Epistasis analysis indicates that ECT-2 crosstalks to the canonical RAS/MAPK cascade upstream of the RAS GEF SOS-1 by means of a RHO-1 signalling pathway. Our results raise the possibility that the transforming activity of the mammalian ect-2 oncogene could be due to hyperactivation of the RAS/MAPK pathway.
|Item Type:||Journal Article, refereed|
|Communities & Collections:||07 Faculty of Science > Institute of Molecular Life Sciences|
|DDC:||570 Life sciences; biology|
|Deposited On:||11 Feb 2008 12:14|
|Last Modified:||28 Nov 2013 00:45|
|Publisher:||Nature Publishing Group|
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