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Transfected human beta-polymerase promoter contains a ras-responsive element
P S Kedar1, D R Lowy, S G Widen
1Laboratory of Biochemistry, National Cancer Institute, Bethesda, Maryland 20892.
Molecular and Cellular Biology
|July 1, 1990
Summary
Human beta-polymerase, crucial for DNA repair, is activated by ras oncogene signaling. A specific DNA sequence in the beta-polymerase promoter is essential for this ras-mediated activation, offering insights into DNA repair regulation.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Beta-polymerase is a key enzyme in vertebrate DNA repair, specifically for gap-filling synthesis.
- Understanding the regulation of beta-polymerase is crucial for comprehending genomic stability and repair pathways.
Purpose of the Study:
- To investigate the regulatory mechanisms of the human beta-polymerase promoter.
- To identify the role of ras signaling in beta-polymerase gene activation.
Main Methods:
- Cloning of the human beta-polymerase promoter.
- Transient expression assays in NIH 3T3 cells.
- Analysis of promoter activity following p21v-rasH expression.
Main Results:
- The human beta-polymerase promoter is activated by p21v-rasH expression.
- A specific decanucleotide palindromic element (GTGACGTCAC) located at positions -49 to -40 is identified as critical.
- This element is required for ras-mediated promoter stimulation.
Conclusions:
- Ras signaling pathways can directly influence the expression of beta-polymerase.
- The identified palindromic element is a key regulatory site for ras-mediated activation of the beta-polymerase gene.
- These findings contribute to understanding the interplay between oncogenes and DNA repair mechanisms.