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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
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E2F1 regulates p53R2 gene expression in p53-deficient cells.
Jun-Juan Qi1, Ling Liu, Ji-Xiang Cao
1Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Xue Yuan Road 38, Beijing, 100191, People's Republic of China.
Molecular and Cellular Biochemistry
|October 15, 2014
Summary
Transcription factor E2F1 regulates p53R2 gene expression in DNA damage response (DDR) in p53-deficient cells. Silencing p53R2 enhances cancer cell apoptosis, suggesting p53R2 as a therapeutic target.
Area of Science:
- Molecular Biology
- Cancer Research
- Cellular Biology
Background:
- The p53R2 gene, a target of p53 proteins, is crucial in DNA damage response (DDR).
- The mechanism of p53R2 induction in p53-deficient cells during DDR remains unclear.
Purpose of the Study:
- To elucidate the regulation of p53R2 gene expression in p53-deficient cells during DDR.
- To investigate the role of transcription factor E2F1 in p53R2 regulation.
Main Methods:
- Ectopic expression and silencing of E2F1 in HCT116 cells (p53-deficient and wild-type).
- Luciferase reporter assays to assess promoter activity.
- Chromatin immunoprecipitation (ChIP) assays to determine E2F1 binding sites.
- Analysis of apoptosis following p53R2 silencing.
Main Results:
- E2F1 directly activates p53R2 gene expression in a p53-independent manner.
- E2F1 binds to the p53R2 promoter region (-684 to -677) under DNA damage conditions.
- Silencing p53R2 sensitizes cancer cells to adriamycin (ADR)-induced apoptosis.
Conclusions:
- E2F1 plays a significant role in p53R2 regulation during DDR in p53-deficient cells.
- p53R2 protects cancer cells from ADR-induced apoptosis, making it a potential therapeutic target.
- Understanding E2F1-mediated p53R2 activation offers insights into DDR mechanisms.
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