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Upstream sequences confer atrial-specific expression on the human atrial natriuretic factor gene
M C LaPointe1, J P Wu, B Greenberg
1Department of Medicine, University of California, San Francisco 94143.
The Journal of Biological Chemistry
|July 5, 1988
Summary
A specific DNA sequence in the human atrial natriuretic factor (hANF) gene regulates its expression in heart cells. This region interacts with a cardiac-specific protein, controlling gene activity.
Area of Science:
- Molecular Biology
- Cardiovascular Genetics
- Gene Regulation
Background:
- The human atrial natriuretic factor (hANF) gene plays a crucial role in cardiovascular homeostasis.
- Understanding the regulatory mechanisms of hANF gene expression is vital for cardiovascular research.
Purpose of the Study:
- To identify and characterize the regulatory elements within the 5'-flanking region of the hANF gene.
- To investigate the tissue-specific expression of hANF in cardiac cells.
Main Methods:
- Subcloning of hANF 5'-flanking sequences into a reporter plasmid (pSVOCAT).
- Transfection into primary cultures of neonatal rat atrial and ventricular cardiocytes.
- Reporter gene (CAT) activity assays, S1 nuclease mapping, RNase protection analysis, and gel shift assays.
Main Results:
- Expression of hANF-CAT constructs was observed in atrial cardiocytes but not in ventricular or nonmyocardial cells, indicating tissue-specific regulation.
- Deletion of the sequence between -409 and -332 significantly reduced reporter gene activity.
- A specific cardiac nuclear protein was identified that binds to the -400 to -208 region of the hANF gene.
Conclusions:
- The DNA sequence between -409 and -332 of the hANF gene contains a critical tissue-specific regulatory element.
- This element's activity is likely mediated by the interaction with a cardiac-specific nuclear protein.
- These findings elucidate a key mechanism for the tissue-specific expression of the hANF gene in the heart.