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Capicua integrates input from two maternal systems in Drosophila terminal patterning
Einat Cinnamon1, Devorah Gur-Wahnon, Aharon Helman
1Department of Biochemistry, Faculty of Medicine, Hadassah Medical School, The Hebrew University, Jerusalem, Israel.
The EMBO Journal
|October 29, 2004
Summary
Maternal posterior genes positively regulate Drosophila embryonic development by influencing tailless and huckebein gene expression. This interaction refines Torso receptor tyrosine kinase (RTK) signaling for precise spatial patterning.
Area of Science:
- Developmental biology
- Genetics
- Molecular biology
Background:
- The maternal terminal system in Drosophila specifies embryonic cell fates at the poles through Torso receptor tyrosine kinase (RTK) signaling.
- Torso pathway activation relieves Capicua and Groucho repressor activity, enabling expression of terminal gap genes tailless and huckebein.
Purpose of the Study:
- To investigate the novel positive input of maternal posterior group genes on tailless and huckebein transcription.
- To elucidate the convergence of terminal and posterior developmental systems in Drosophila embryogenesis.
Main Methods:
- Analysis of gene expression patterns in Drosophila mutants lacking or overexpressing specific posterior group genes.
- Investigating the role of Capicua repressor localization in posterior group mutants.
Main Results:
- Absence or overactivation of certain posterior group genes altered the spatial expression domains of tailless and huckebein.
- Capicua exclusion from termini was ineffective in posterior group mutants, correlating with reduced terminal gap gene expression.
Conclusions:
- The terminal and posterior systems coordinately relieve Capicua-mediated transcriptional silencing.
- The posterior system fine-tunes Torso RTK signaling output, ensuring precise spatial expression of tailless and huckebein.