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E2F1: Cause and Consequence of DNA Replication Stress
Shahd Fouad1, David Hauton1, Vincenzo D'Angiolella1
1Department of Oncology, Medical Research Council Oxford Institute for Radiation Oncology, University of Oxford, Oxford, United Kingdom.
Abstract:
In mammalian cells, cell cycle entry occurs in response to the correct stimuli and is promoted by the transcriptional activity of E2F family members. E2F proteins regulate the transcription of S phase cyclins and genes required for DNA replication, DNA repair, and apoptosis. The activity of E2F1, the archetypal and most heavily studied E2F family member, is tightly controlled by the DNA damage checkpoints to modulate cell cycle progression and initiate programmed cell death, when required. Altered tumor suppressor and oncogenic signaling pathways often result in direct or indirect interference with E2F1 regulation to ensure higher rates of cell proliferation independently of external cues. Despite a clear link between dysregulated E2F1 activity and cancer progression, literature on the contribution of E2F1 to DNA replication stress phenotypes is somewhat scarce. This review discusses how dysfunctional tumor suppressor and oncogenic signaling pathways promote the disruption of E2F1 transcription and hence of its transcriptional targets, and how such events have the potential to drive DNA replication stress. In addition to the involvement of E2F1 upstream of DNA replication stress, this manuscript also considers the role of E2F1 as a downstream effector of the response to this type of cellular stress. Lastly, the review introduces some reflections on how E2F1 activity is integrated with checkpoint control through post-translational regulation, and proposes an exploitable tumor weakness based on this axis.
Insights
Dysregulated E2F1 activity, driven by faulty cancer pathways, promotes DNA replication stress. This review explores E2F1
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- E2F family proteins control cell cycle entry and regulate genes for DNA replication, repair, and apoptosis.
- E2F1 activity is crucial for cell cycle progression and programmed cell death, tightly regulated by DNA damage checkpoints.
- Dysfunctional tumor suppressor and oncogenic pathways disrupt E2F1 regulation, leading to uncontrolled proliferation.
Purpose of the Study:
- To review the link between disrupted E2F1 regulation and DNA replication stress phenotypes in cancer.
- To discuss E2F1's role both upstream and downstream of DNA replication stress.
- To explore E2F1 integration with checkpoint control and propose a therapeutic vulnerability.
Main Methods:
- Literature review synthesizing current research on E2F1, DNA replication stress, and cancer signaling pathways.
- Analysis of how altered signaling pathways impact E2F1 transcription and its targets.
- Examination of E2F1's role in cellular responses to DNA replication stress.
Main Results:
- Dysfunctional cancer signaling pathways disrupt E2F1 transcription, driving DNA replication stress.
- E2F1 acts as both a cause and a consequence of DNA replication stress.
- Post-translational regulation integrates E2F1 activity with checkpoint control.
Conclusions:
- Disrupted E2F1 regulation is a significant contributor to DNA replication stress and cancer progression.
- E2F1's multifaceted role in DNA replication stress response presents therapeutic opportunities.
- Targeting the E2F1-checkpoint axis may offer a novel strategy against cancer.
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