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Master Transcription Regulators

Master Transcription Regulators

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...

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...

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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...

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Related Experiment Video

Updated: Jun 1, 2026

In Vitro Differentiation of Human CD4+FOXP3+ Induced Regulatory T Cells (iTregs) from Naïve CD4+ T Cells Using a TGF-β-containing Protocol

In Vitro Differentiation of Human CD4⁺FOXP3⁺ Induced Regulatory T Cells (iTregs) from Naïve CD4⁺ T Cells Using a TGF-β-containing Protocol

Published on: December 30, 2016

FoxP3 interacts with linker histone H1.5 to modulate gene expression and program Treg cell activity.

S L Mackey-Cushman¹, J Gao, D A Holmes

¹Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599, USA.

Genes and Immunity

|June 10, 2011

Summary

The transcription factor FoxP3 interacts with histone H1.5 to regulate gene expression in T cells. This interaction is crucial for the function of regulatory T (Treg) cells, impacting their ability to suppress immune responses.

Related Experiment Videos

Last Updated: Jun 1, 2026

In Vitro Differentiation of Human CD4+FOXP3+ Induced Regulatory T Cells (iTregs) from Naïve CD4+ T Cells Using a TGF-β-containing Protocol

In Vitro Differentiation of Human CD4⁺FOXP3⁺ Induced Regulatory T Cells (iTregs) from Naïve CD4⁺ T Cells Using a TGF-β-containing Protocol

Published on: December 30, 2016

Area of Science:

Immunology
Epigenetics
Molecular Biology

Background:

The transcription factor FoxP3 is essential for regulatory T (Treg) cell development and function.
Epigenetic mechanisms underlying FoxP3's role in gene modulation within Treg cells are not fully understood.

Purpose of the Study:

To identify proteins interacting with FoxP3 in human T cells.
To elucidate the functional consequences of FoxP3-interacting proteins on Treg cell activity and gene expression.

Main Methods:

Co-immunoprecipitation followed by mass spectrometry (MS) to identify FoxP3-interacting proteins.
Site-directed mutagenesis to investigate the role of specific FoxP3 domains in protein interactions.
Gene silencing techniques (e.g., siRNA) to assess the impact of protein depletion on gene expression and Treg function.
Chromatin immunoprecipitation (ChIP) to analyze histone association at target gene promoters.

Main Results:

FoxP3 was found to interact with linker histone H1.5 through its leucine zipper (LZ) domain.
Mutations in the FoxP3 LZ domain, observed in IPEX patients, disrupted H1.5 interaction.
FoxP3 and H1.5 cooperatively repressed interleukin-2 (IL-2) expression; H1.5 depletion impaired FoxP3-mediated IL-2 suppression.
FoxP3 enhanced H1.5 binding at the IL-2 promoter while reducing it at the CTLA4 promoter, correlating with altered histone acetylation.
H1.5 depletion in human Treg cells compromised their suppressive function.

Conclusions:

FoxP3 interacts with histone H1.5 to epigenetically regulate gene expression in T cells.
This interaction is critical for programming the suppressive function of human Treg cells.
The findings reveal a novel mechanism by which FoxP3 controls Treg cell activity through modulation of histone association.