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Supplemental Material for Kushnir et al., 2020

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posted on 2019-12-05, 17:12 authored by Shaked Bar-Cohen, Navit Mooshayef, Rotem Lange, Allan Bar-Sinai, Helit Rozen, Adi Salzberg, David Engelberg, Ze’ev Paroush

Excessive RTK signaling, often caused by activating mutations in Ras, Raf and/or MEK, occurs in most human tumors. Intriguingly, confirmed cancer-driver mutations in the downstream effector kinase, ERK, have not been reported. To test if active ERK mutants can function as oncoproteins, we introduced an activating mutation, originally identified in a yeast ERK, into the single Drosophila ERK. We find that this mutation renders ERK catalytically active independently of upstream signaling, and that its expression induces extensive over-proliferation and hyperplastic tumor formation in vivo. Thus, some human ERK1/2 mutations identified in patient-derived tumours may actually represent overlooked oncogenic, cancer-causing mutations.


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An Activating Mutation in ERK Causes Hyperplastic Tumors in a scribble Mutant Tissue in Drosophila

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