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Identification of BMP-responsive elements in the mouse Id2 gene.
Takeshi Nakahiro1, Hisanori Kurooka, Kentaro Mori
1Division of Molecular Genetics, Department of Biochemistry and Bioinformative Sciences, School of Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan.
Biochemical and Biophysical Research Communications
|August 3, 2010
Summary
Bone morphogenetic protein (BMP) signaling regulates gene expression. Researchers identified specific DNA elements in the mouse Id2 gene that respond to BMP6, revealing how Smad proteins bind to control gene activity.
Area of Science:
- Molecular Biology
- Cell Signaling
- Gene Regulation
Background:
- Inhibitor of DNA binding/differentiation (Id) genes are key targets of bone morphogenetic protein (BMP) signaling pathways.
- Understanding the precise molecular mechanisms by which BMPs regulate Id gene expression is crucial for deciphering cellular differentiation processes.
Purpose of the Study:
- To elucidate the molecular basis of BMP6-induced gene expression of mouse Id2 in C2C12 myoblasts.
- To identify and characterize the specific DNA regulatory elements responsible for BMP responsiveness in the Id2 gene.
Main Methods:
- Reporter assays were employed to identify BMP6-responsive regions upstream of the Id2 transcription start site.
- Site-directed mutagenesis was used to analyze the functional importance of potential Smad binding sites.
- Gel shift and chromatin immunoprecipitation (ChIP) assays confirmed the physical interaction of Smad proteins with identified DNA elements.
Main Results:
- A BMP6-responsive region was located 3.0kb upstream of the mouse Id2 transcription initiation site.
- Specific elements, including GGCGCC palindromes and a GTCT element, were identified as critical for BMP response.
- A novel bipartite sequence involving a CGCC element was found to be important for Smad protein binding and gene regulation.
Conclusions:
- The study successfully identified key BMP-responsive elements within the mouse Id2 gene.
- These findings demonstrate the direct involvement of Smad proteins in mediating BMP6-induced Id2 expression.
- The uncharacterized CGCC sequence plays a significant role in Smad protein recognition and target gene regulation.
