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Published on: February 28, 2014
Broadly expressed repressors integrate patterning across orthogonal axes in embryos
Theodora Koromila1, Angelike Stathopoulos2
1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125.
Ubiquitously expressed repressors like Runt (Run) and Suppressor of Hairless [Su(H)] transiently silence enhancers, controlling gene expression timing. This mechanism coordinates patterning along both anterior-posterior and dorsal-ventral axes in the Drosophila embryo.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- The role of spatially restricted repressors in embryonic patterning is established.
- The function of broadly expressed repressors in this process remains less understood.
- Previous work implicated Runt (Run) and Suppressor of Hairless [Su(H)] in axis-specific gene regulation.
Purpose of the Study:
- To investigate the function of broadly expressed repressors Runt (Run) and Suppressor of Hairless [Su(H)] in Drosophila embryonic patterning.
- To elucidate the mechanism by which these repressors influence gene expression and axis formation.
Main Methods:
- Investigated the function of Runt (Run) and Suppressor of Hairless [Su(H)] in Drosophila embryos.
- Analyzed the regulatory role of these repressors on enhancers within cis-regulatory systems.
- Examined the spatiotemporal control of gene expression along both anterior-posterior (AP) and dorsal-ventral (DV) axes.
Main Results:
- Broadly expressed repressors transiently silence specific enhancers across the entire embryo.
- This silencing mechanism regulates spatiotemporal gene expression outputs along both AP and DV axes.
- Run and Su(H) were shown to regulate the temporal activity of enhancers.
Conclusions:
- Run and Su(H) act as regulators of enhancer temporal action, not solely axis-specific determinants.
- These repressors function coordinately to pattern both the anterior-posterior and dorsal-ventral axes.
- The study reveals a novel mechanism of embryonic patterning involving transient, widespread enhancer silencing.
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