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Synergistic function of E2F7 and E2F8 is essential for cell survival and embryonic development
1Department of Molecular Virology, The Ohio State University, Columbus, OH 43210, USA.
Developmental Cell
|January 16, 2008
Summary
The study reveals that E2f7 and E2f8 proteins are crucial for embryonic development. Their combined absence causes lethality by increasing apoptosis and stress genes, highlighting their role in the E2F1-p53 pathway.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- E2f7 and E2f8 are transcriptional repressors involved in cell proliferation control.
- Their specific roles in embryonic development and potential redundancy are not fully understood.
Purpose of the Study:
- To investigate the in vivo function of E2f7 and E2f8 during mouse embryonic development.
- To elucidate the molecular mechanisms underlying the developmental consequences of E2f7 and E2f8 loss.
Main Methods:
- Generation and analysis of E2f7 and E2f8 single and double knockout mouse models.
- Assessment of embryonic lethality, apoptosis, and gene expression profiling.
- Analysis of E2F7/E2F8 binding to target gene promoters.
Main Results:
- Individual deletion of E2f7 or E2f8 had no discernible effect on embryonic development.
- Combined ablation of E2f7 and E2f8 resulted in embryonic lethality by E11.5 due to massive apoptosis and vascular defects.
- Loss of E2f7/E2f8 led to increased E2f1, p53, and stress-related gene expression.
- E2F7 and E2F8 were found to bind to target promoters, including E2f1.
- Deletion of E2f1 or p53 rescued the embryonic lethality in E2f7/E2f8 double mutants.
Conclusions:
- E2F7 and E2F8 function as a critical repressive arm of the E2F transcriptional network.
- This E2F7/E2F8 repressive function is essential for preventing E2F1-p53-mediated apoptosis during embryonic development.
- E2F7 and E2F8 are indispensable for embryonic viability and proper vascular development.
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