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Sumoylation differentially regulates Goosecoid-mediated transcriptional repression
Luisa Izzi1, Masahiro Narimatsu, Liliana Attisano
1Department of Medical Biophysics, Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, Ontario Canada M5S 3E1.
Experimental Cell Research
|March 14, 2008
Summary
Goosecoid (Gsc) protein
Area of Science:
- Developmental Biology
- Molecular Biology
- Cancer Biology
Background:
- Goosecoid (Gsc) is a homeobox gene crucial for the vertebrate organizer.
- Gsc acts as a transcriptional repressor via DNA binding or Foxh1 recruitment.
- Post-translational modification of Gsc by SUMOylation is investigated.
Purpose of the Study:
- To investigate the role of SUMOylation in regulating Goosecoid (Gsc) function.
- To determine how SUMOylation affects Gsc's transcriptional repression activity.
- To explore the implications of Gsc sumoylation in cell morphology and cancer.
Main Methods:
- Expression of a SUMO-defective Gsc mutant (Gsc 6Km) in breast cancer cells.
- Analysis of Gsc sumoylation in the presence of PIAS proteins.
- Reporter gene assays to assess promoter activity and Gsc repression.
Main Results:
- Gsc is post-translationally modified by SUMO proteins, enhanced by PIAS family members.
- SUMOylation-defective Gsc mutant (Gsc 6Km) causes morphological changes in breast cancer cells.
- Gsc sumoylation is not required for repressing Foxh1-mediated promoters but is crucial for direct DNA-binding-mediated repression.
Conclusions:
- SUMO modification regulates Gsc's repressive activity in a promoter-specific manner.
- This regulation impacts genes controlling cell morphology in development and cancer.
- SUMOylation acts as a key modulator of Goosecoid function.
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