Related Experiment Videos
HSPG modification by the secreted enzyme Notum shapes the Wingless morphogen gradient
Antonio J Giráldez1, Richard R Copley, Stephen M Cohen
1European Molecular Biology Laboratory, Meyerhofstrasse 1, D-69117 Heidelberg, Germany.
Developmental Cell
|May 23, 2002
Summary
A newly identified protein, Notum, represses Wingless signaling activity in Drosophila. Notum modifies Wingless protein distribution by interacting with cell surface proteoglycans, thereby shaping the Wingless gradient.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Wingless (Wg) is a crucial secreted morphogen directing pattern formation in Drosophila imaginal discs.
- Understanding the regulation of Wg signaling gradients is essential for deciphering developmental processes.
Purpose of the Study:
- To identify and characterize novel regulators of Wingless signaling.
- To elucidate the molecular mechanisms by which Wingless protein distribution is controlled.
Main Methods:
- Genetic screens to identify novel signaling regulators.
- Biochemical assays to analyze protein-protein interactions.
- Analysis of protein distribution using imaging techniques.
Main Results:
- Identification of Notum, a secreted alpha/beta-hydrolase superfamily member, as a novel repressor of Wingless activity.
- Loss of Notum function enhances Wingless signaling by altering gradient shape.
- Notum modifies Wingless distribution by interacting with heparan sulfate proteoglycans Dally and Dally-like.
- Wingless signaling induces Notum expression, creating a negative feedback loop.
Conclusions:
- Notum plays a key role in shaping Wingless morphogen gradients.
- Wingless signaling is self-regulating through the induction of Notum.
- This regulatory mechanism ensures precise pattern formation during Drosophila development.