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EDL/MAE regulates EGF-mediated induction by antagonizing Ets transcription factor Pointed
Takuma Yamada1, Masataka Okabe, Yasushi Hiromi
1Department of Developmental Genetics, National Institute of Genetics, Shizuoka 411-8540, Japan.
Development (Cambridge, England)
|July 23, 2003
Summary
EDL/MAE is a novel negative regulator in Drosophila development. It prevents autocrine Ras signaling activation, ensuring cells remain competent for induction and preventing uncontrolled cell fate spread.
Area of Science:
- Developmental Biology
- Cell Signaling
- Genetics
Background:
- Inductive patterning relies on negative regulators for efficient signaling.
- Spitz EGF signaling in Drosophila induces neuronal development via Ras/MAPK pathway activation, leading to Pointed P2 transcription factor activation.
Purpose of the Study:
- To investigate the function of a novel negative regulator, EDL/MAE, in Ras signaling during Drosophila development.
- To elucidate the mechanism by which EDL/MAE influences Spitz-mediated induction and Pointed P2 activity.
Main Methods:
- Analysis of EDL/MAE loss-of-function mutants in Drosophila.
- Investigating the interaction between EDL/MAE and the Pointed P2 transcription factor.
- Examining the expression pattern of edl/mae in relation to inducing cells.
Main Results:
- Loss of EDL/MAE function leads to a decrease in photoreceptor neurons and chordotonal organs.
- EDL/MAE antagonizes Pointed P2 activity by binding to its Pointed domain, inhibiting transcriptional activation.
- edl/mae is expressed in inducing cells, and its hyperactivation in these cells impairs their inductive ability.
Conclusions:
- EDL/MAE acts as a crucial negative regulator, preventing autocrine activation of Pointed P2 in Drosophila inducing cells.
- This mechanism ensures that inducing cells maintain their competence for further induction.
- Pointed P2-mediated inhibition of inducing ability represents a novel negative feedback loop to control developmental signaling.