Crook M, Hanna-Rose W. Overactive EGF signaling suppresses a
C. elegans pnc-1 egg-laying phenotype independent of known signaling mediators.
MICROPUBLICATION BIOLOGY 2021;
2021. [PMID:
34723146 PMCID:
PMC8553428 DOI:
10.17912/micropub.biology.000482]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 09/22/2021] [Accepted: 09/23/2021] [Indexed: 11/28/2022]
Abstract
Nicotinamide recycling is critical to the development and function of Caenorhabditis elegans. Excess nicotinamide in a pnc-1 nicotinamidase mutant causes the necrosis of uv1 and OLQ cells and a highly penetrant egg laying defect. An EGF receptor (let-23) gain-of-function mutation suppresses the Egl phenotype in pnc-1 animals. However, gain-of-function mutations in either of the known downstream mediators, let-60/ Ras or itr-1, are not sufficient. Phosphatidylcholine synthesis is neither required nor sufficient, in contrast to its role in the let-23gf rescue of uv1 necrosis. The mechanism behind the let-23gf suppression of the pnc-1 Egl phenotype is unknown.
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