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Transcription Factors

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

Protein Complexes with Interchangeable Parts

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The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...

Cell Specific Gene Expression

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...

Master Transcription Regulators

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

General Transcription Factors

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

Cell Specific Gene Expression

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...

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Related Experiment Video

Updated: Jul 21, 2026

Analysis of Cell Cycle Position in Mammalian Cells

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Compensation and specificity of function within the E2F family.

L-J Kong¹, J T Chang, A H Bild

¹Department of Molecular Genetics and Microbiology, Institute for Genome Sciences and Policy, Duke University Medical Center, Durham, NC 27710, USA.

|August 16, 2006

Summary

Both E2F1 and E2F3 proteins are crucial for cell cycle progression. Acute loss of E2F3 impacts DNA replication and mitosis genes, while E2F1 affects distinct genes, revealing specific roles.

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Area of Science:

Molecular Biology
Cell Cycle Regulation

Background:

Mammalian genomes contain multiple related genes for functions found in single genes in simpler organisms.
The retinoblastoma and E2F protein families regulate cell cycle transcription.
Compensatory effects from overlapping gene functions complicate analysis of germline mutations.

Purpose of the Study:

To investigate the distinct roles of E2F1 and E2F3 proteins in cell cycle regulation.
To overcome compensatory effects by studying temporary loss of function using small-interfering RNAs (siRNAs).

Main Methods:

Utilized siRNAs to transiently inhibit individual E2F proteins (E2F1 and E2F3).
Analyzed the impact of acute E2F loss on cell cycle entry (quiescent to S phase) and progression (growing cells).
Examined gene expression changes related to DNA replication and mitotic activities.

Main Results:

Both E2F1 and E2F3 are essential for quiescent cells to enter S phase.
E2F3, but not E2F1, is necessary for S phase progression in actively growing cells.
Acute E2F3 loss affects expression of DNA replication and mitotic genes.
Acute E2F1 loss impacts a distinct, limited set of genes compared to E2F3.

Conclusions:

Temporary loss-of-function analysis reveals specific and distinct roles for E2F1 and E2F3.
Long-term loss of E2F activity leads to compensatory mechanisms by other family members.