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Updated: Jun 25, 2026
Spatial and Temporal Analysis of Active ERK in the C. elegans Germline
Published on: November 29, 2016
Multiple ERK substrates execute single biological processes in Caenorhabditis elegans germ-line development
Swathi Arur1, Mitsue Ohmachi, Sudhir Nayak
1Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110, USA.
Abstract:
RAS-extracellular signal regulated kinase (ERK) signaling governs multiple aspects of cell fate specification, cellular transitions, and growth by regulating downstream substrates through phosphorylation. Understanding how perturbations to the ERK signaling pathway lead to developmental disorders and cancer hinges critically on identification of the substrates. Yet, only a limited number of substrates have been identified that function in vivo to execute ERK-regulated processes. The Caenorhabditis elegans germ line utilizes the well-conserved RAS-ERK signaling pathway in multiple different contexts. Here, we present an integrated functional genomic approach that identified 30 ERK substrates, each of which functions to regulate one or more of seven distinct biological processes during C. elegans germ-line development. Our results provide evidence for three themes that underlie the robustness and specificity of biological outcomes controlled by ERK signaling in C. elegans that are likely relevant to ERK signaling in other organisms: (i) multiple diverse ERK substrates function to control each individual biological process; (ii) different combinations of substrates function to control distinct biological processes; and (iii) regulatory feedback loops between ERK and its substrates help reinforce or attenuate ERK activation. Substrates identified here have conserved orthologs in humans, suggesting that insights from these studies will contribute to our understanding of human diseases involving deregulated ERK activity.
Insights
Researchers identified 30 new substrates for the RAS-extracellular signal regulated kinase (ERK) pathway in C. elegans. These substrates control seven key developmental processes, offering insights into how ERK signaling impacts cell fate and disease.
Area of Science:
- Cell Biology
- Genetics
- Developmental Biology
Background:
- RAS-extracellular signal regulated kinase (ERK) signaling is crucial for cell fate, transitions, and growth.
- Identifying ERK substrates is vital for understanding developmental disorders and cancer.
- Limited in vivo substrates for ERK signaling have been identified previously.
Purpose of the Study:
- To identify novel ERK substrates in the C. elegans germ line.
- To understand how these substrates regulate biological processes.
- To elucidate the mechanisms of ERK signaling robustness and specificity.
Main Methods:
- Integrated functional genomic approach in Caenorhabditis elegans.
- Systematic identification of ERK substrates.
- Analysis of substrate roles in seven distinct germ-line developmental processes.
Main Results:
- Identified 30 novel ERK substrates.
- Demonstrated that multiple substrates regulate individual processes.
- Showed distinct substrate combinations control different biological processes.
- Revealed regulatory feedback loops involving ERK and its substrates.
Conclusions:
- ERK signaling employs diverse substrates for robust and specific control of biological processes.
- These findings in C. elegans are relevant to ERK signaling in other organisms, including humans.
- Identified substrates with conserved human orthologs, potentially illuminating human diseases linked to deregulated ERK activity.
