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Structure, expression, and functional characterization of the mouse CLP-1 gene
Facan Huang1, Michael Wagner, M A Q Siddiqui
1Department of Anatomy and Cell Biology, Center for Cardiovascular and Muscle Research, Box 5, State University of New York, Health Science Center at Brooklyn, 450 Clarkson Avenue, Brooklyn, NY 11203, USA.
Gene
|July 18, 2002
Summary
Mouse CLP-1, a novel cardiac transcriptional regulatory factor, is widely expressed and may mediate gene transcription. It interacts with cardiac-specific factors to regulate gene expression, suggesting a role in heart development.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- CLP-1 is a novel protein homologous to human HIS1.
- The CLP-1 gene lacks introns and expresses two mRNAs via alternative polyadenylation.
- CLP-1 is widely expressed across tissues and during early development, localizing to the nucleus.
Purpose of the Study:
- To investigate the role of mouse CLP-1 as a potential cardiac transcriptional regulatory factor.
- To analyze the CLP-1 gene promoter for potential transcription factor binding sites.
- To determine CLP-1's interaction with cardiac-specific promoters.
Main Methods:
- Gene expression analysis via alternative polyadenylation.
- Protein homology assessment with human HIS1.
- Promoter activity assays in various cell types.
- Analysis of potential transcription factor binding sites (Nkx2.5, GATA-4).
- Reporter gene assays to assess promoter "squelching" activity.
Main Results:
- CLP-1 encodes a 41 kDa protein, 85.3% homologous to human HIS1.
- The CLP-1 promoter is active in diverse cell types and contains binding sites for cardiogenic factors.
- CLP-1 concentration-dependently "squelches" the cardiac MLC-2v promoter in cardiac cells, but not others.
- CLP-1 expression patterns resemble those of LCR-F1 and Oct-1.
Conclusions:
- CLP-1 is a widely expressed nuclear protein with a potential role in cardiac development.
- CLP-1 may interact with cardiac-specific factors to regulate gene expression, such as cardiac MLC-2v.
- CLP-1 functions as a transcriptional mediator, potentially potentiating cell-specific transcription factors.