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Increased levels of E2F-1-dependent DNA binding activity after UV- or gamma-irradiation
M Höfferer1, C Wirbelauer, B Humar
1Friedrich Miescher Institut, Maulbeerstrasse 66, CH-4058 Basel, Switzerland and Departement Forschung, Kantonsspital Basel, Hebelstrasse 20, CH-4031 Basel, Switzerland.
Abstract:
In mammalian cells, DNA damage induces robust changes in gene expression and these changes contribute to the proper execution of cellular responses to DNA damage, including DNA repair, cell cycle arrest and apoptosis. The transcription factor E2F-1 has been suggested to play a key role in the regulation of cell cycle-dependent gene expression and apoptosis. These activities depend on the ability of E2F-1 to form functionally active DNA binding complexes. Here we describe an assay that allows one to measure E2F-1 DNA binding activity in naive cells. We find that DNA damage, generated by UV- or gamma-irradiation, prompts increased production of E2F-1 DNA binding activity, which, at least in part, originates from alterations in E2F-1 protein levels. These findings represent an indication for a role of the transcription factor E2F-1 in the DNA damage response pathway.
Insights
DNA damage triggers increased E2F-1 DNA binding activity in mammalian cells, crucial for cellular responses. This enhanced activity, linked to E2F-1 protein levels, highlights its role in DNA damage pathways.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Mammalian cells exhibit significant gene expression changes upon DNA damage, facilitating cellular responses like repair, cell cycle arrest, and apoptosis.
- The transcription factor E2F-1 is implicated in regulating cell cycle-dependent gene expression and apoptosis.
- E2F-1's function relies on its capacity to form active DNA-binding complexes.
Purpose of the Study:
- To develop and utilize an assay for measuring E2F-1 DNA binding activity in naive cells.
- To investigate the impact of DNA damage on E2F-1 DNA binding activity.
Main Methods:
- Development of a novel assay to quantify E2F-1 DNA binding activity.
- Application of UV- and gamma-irradiation to induce DNA damage in mammalian cells.
- Analysis of E2F-1 protein levels in response to DNA damage.
Main Results:
- The assay successfully measured E2F-1 DNA binding activity in naive cells.
- DNA damage induced by UV or gamma irradiation significantly increased E2F-1 DNA binding activity.
- The observed increase in E2F-1 DNA binding activity was partly attributed to changes in E2F-1 protein levels.
Conclusions:
- E2F-1 DNA binding activity is upregulated following DNA damage.
- Alterations in E2F-1 protein levels contribute to the increased DNA binding activity post-damage.
- These findings support a role for the transcription factor E2F-1 in the cellular DNA damage response pathway.