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Interactions between Wingless and DFz2 during Drosophila wing development
1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260 USA.
Development (Cambridge, England)
|July 22, 1998
Summary
Drosophila DFz2 receptor is crucial for Wingless (Wg) signaling during development. Overexpressing DFz2 enhances Wg signaling, while dominant-negative forms block it, indicating DFz2
Area of Science:
- Developmental Biology
- Cell Signaling
- Genetics
Background:
- Wingless (Wg) is a key Wnt family secreted signaling protein in Drosophila.
- DFz2, a Frizzled (Fz) homolog, is known to interact with Wg in cell culture.
- Its role in Wg signaling during fly development remains unclear.
Purpose of the Study:
- To determine if DFz2 functions in the Wg signaling pathway during Drosophila development.
- To investigate the specific roles of DFz2 and Fz in Wg-mediated developmental processes.
Main Methods:
- Overexpression of full-length and truncated DFz2 and Fz in Drosophila.
- Analysis of Wg-dependent signaling, including ectopic bristle formation and polarity.
- Rescue experiments using co-expression of different Fz family members.
Main Results:
- Overexpression of DFz2 enhances Wg signaling, inducing ectopic margin bristles in wings.
- Dominant-negative DFz2 blocks Wg signaling at the wing margin, rescuable by full-length DFz2.
- Truncated Fz also inhibits Wg signaling, and truncated DFz2 affects eye development polarity.
Conclusions:
- DFz2, not Fz, appears to be the primary receptor for Wg signaling in wing margin development.
- Dominant-negative Fz family proteins can disrupt multiple Wnt signaling pathways.
- Truncated Fz family proteins may exhibit reduced signaling specificity.