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tantalus, a potential link between Notch signalling and chromatin-remodelling complexes.
Bruce H Dietrich1, Ping Yang, Henry M Krause
1Department of Medical Genetics and Microbiology, Charles H. Best Institute, University of Toronto, Ontario M5G 1L6, Canada.
Development Genes and Evolution
|February 18, 2005
Summary
The tantalus (tan) gene protein disrupts Notch (N) signaling, affecting fly development. This study reveals TAN
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- The tantalus (tan) gene encodes a protein interacting with Additional sex combs (ASX).
- tan mutations cause defects in fly eyes, wings, and bristles, similar to Notch (N) pathway disruptions.
Purpose of the Study:
- To investigate the interaction between the tantalus (tan) gene and the Notch (N) signaling pathway.
- To determine if TAN protein influences N signaling processes and target gene expression.
Main Methods:
- Examining ectopic tan phenotypes in adult flies.
- Analyzing the expression of N target genes (wingless and cut) under ectopic tan expression.
- Utilizing a genetic assay to confirm tan and N pathway interaction.
Main Results:
- Ectopic TAN expression disrupts N signaling's core processes: boundary formation, lateral inhibition, and lineage decisions.
- TAN abolishes wingless (wg) and cut gene expression at the wing's dorsal-ventral boundary.
- Genetic assays confirm an interaction between tan and the N pathway.
Conclusions:
- TAN protein directly interferes with Notch (N) signaling.
- TAN's nuclear-cytoplasmic localization and DNA binding suggest a mechanism for responding to N signals.
- This interaction provides new insights into gene regulation during fly development.