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Components of wingless signalling in Drosophila
E Siegfried1, E L Wilder, N Perrimon
1Department of Genetics, Howard Hughes Medical Institute, Harvard Medical School, Boston, Massachusetts 02115.
Nature
|January 6, 1994
Summary
The wingless (wg) gene is crucial for Drosophila embryonic development, regulating cell fate and polarity. This study reveals that dishevelled (dsh) and porcupine (porc) act upstream of zestewhite 3 (zw3), while armadillo (arm) acts downstream in the wg signaling pathway.
Area of Science:
- Developmental biology
- Genetics
- Molecular biology
Background:
- Segment polarity genes, including wingless (wg), are essential for Drosophila embryonic development, determining cell fates and polarity.
- The wg gene encodes a secreted protein homologous to mammalian Wnt-1, playing a critical role in epidermal patterning.
- Wg signaling maintains engrailed expression and specifies naked cuticle differentiation.
Purpose of the Study:
- To investigate the roles of armadillo (arm), dishevelled (dsh), and porcupine (porc) genes in the wingless (Wg) signal transduction pathway.
- To elucidate the precise order of these genes within the Wg signaling cascade.
Main Methods:
- Analysis of embryonic mutant phenotypes for arm, dsh, and porc.
- Investigating the Wg signal transduction pathway and its components.
Main Results:
- Dishevelled (dsh) and porcupine (porc) were found to act upstream of zestewhite 3 (zw3).
- Armadillo (arm) was identified as acting downstream of zestewhite 3 (zw3).
- These findings position dsh, porc, zw3, and arm within the Wg signaling pathway.
Conclusions:
- The study clarifies the molecular hierarchy of key genes in the Drosophila Wg signaling pathway.
- Understanding this pathway provides insights into fundamental mechanisms of cell fate determination and pattern formation in development.