Related Experiment Video
Updated: Jul 28, 2026
Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells
Published on: February 21, 2014
Identification of novel E2F1-regulated genes by microarray
Yihong Ma1, Rhonda Croxton, Ronnie L Moorer
1Program in Molecular Oncology, H. Lee Moffitt Comprehensive Cancer Center and Research Institute, University of South Florida, Tampa, 33612, USA.
Abstract:
The E2F pathway has been proposed to regulate genes involved in the transition from quiescence into DNA synthesis. However, this hypothesis has not been rigorously tested on a genomic scale. Toward this end, we have infected quiescent mouse fibroblasts, which do not express E2F1, with an E2F1-expressing adenovirus and examined the expression of more than 6000 genes using high-density microarrays. Microarray results clearly support the current paradigm; however, they suggest that E2F1 may also regulate unanticipated cellular functions including pathways involved in apoptosis, signal transduction, transcriptional control, and membrane biology. Most surprisingly, we identified a number of genes that are repressed by E2F1 expression, suggesting that E2F1 may have the potential to repress transcription of numerous genes through an unknown mechanism.
Insights
The E2F1 transcription factor activates genes for cell cycle progression. This study reveals E2F1 also impacts apoptosis, signal transduction, and surprisingly, represses other genes.
Area of Science:
- Molecular Biology
- Cell Biology
- Genomics
Background:
- The E2F pathway is hypothesized to control the transition from quiescence to DNA synthesis.
- Previous research has not rigorously tested this hypothesis on a genomic scale.
Purpose of the Study:
- To investigate the genomic-scale effects of E2F1 on gene expression in quiescent cells.
- To identify novel cellular functions regulated by E2F1.
Main Methods:
- Infection of quiescent mouse fibroblasts lacking E2F1 with an adenovirus expressing E2F1.
- Analysis of gene expression for over 6000 genes using high-density microarrays.
Main Results:
- Microarray data support E2F1's role in regulating genes for DNA synthesis.
- E2F1 was found to influence pathways involved in apoptosis, signal transduction, transcriptional control, and membrane biology.
- A significant number of genes were identified as being repressed by E2F1, indicating a potential transcriptional repression role.
Conclusions:
- E2F1 plays a key role in activating genes essential for cell cycle progression.
- E2F1 regulates a broader range of cellular functions than previously understood.
- E2F1 may possess a novel mechanism for repressing gene transcription.
More Related Videos
12:44Identification of Key Factors Regulating Self-renewal and Differentiation in EML Hematopoietic Precursor Cells by RNA-sequencing Analysis
Published on: November 11, 2014
09:58Mapping the Structure-Function Relationships of Disordered Oncogenic Transcription Factors Using Transcriptomic Analysis
Published on: June 27, 2020
