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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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HEB Restrains Effector Gene Expression during Early CD8+ Memory Precursor T Cell Differentiation.

Joanne Pui-Ting Leung1,2, Siamak Haddadi1,2, Michael J Geuenich3,4

  • 1Department of Immunology, University of Toronto, Toronto, Canada.

Molecular and Cellular Biology
|May 26, 2025
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Summary

The transcription factor HEB is crucial for regulating CD8 memory T cell differentiation. HEB-deficient T cells show accelerated differentiation and enhanced effector function, highlighting HEB

Keywords:
CD8 T cellsE proteinsT cell differentiationgene regulationmemory precursor T cell

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Area of Science:

  • Immunology
  • Molecular Biology
  • T cell differentiation

Background:

  • Memory T cells are vital for long-term adaptive immunity.
  • The molecular mechanisms governing T cell lineage choice after TCR signaling remain unclear.
  • The role of transcription factor HEB in peripheral T cell differentiation is poorly understood.

Purpose of the Study:

  • To investigate the function of HEB in the differentiation of CD8 memory T cell precursors.
  • To elucidate the molecular mechanisms by which HEB regulates early T cell differentiation and effector gene expression.

Main Methods:

  • Induction of TCR signaling in CD8 T cells from HEB-deficient and wild-type mice.
  • Analysis of T cell differentiation under memory-polarizing conditions or inflammation.
  • Transcriptomic analysis to identify gene expression changes.
  • Assessment of T cell function following acute viral infection in HEB conditional knockout (cKO) mice.

Main Results:

  • HEB-deficient CD8 T cells exhibited accelerated differentiation compared to wild-type cells.
  • Transcriptomic analysis revealed aberrant upregulation of immune response genes and decreased stemness-associated genes in HEB-deficient cells.
  • HEB-deficient mice showed enhanced memory precursor cell formation and increased effector functionality after viral infection.

Conclusions:

  • HEB is a key regulator in the gene regulatory networks controlling early CD8 memory T cell differentiation.
  • Loss of HEB leads to increased TCR signal strength and a loss of stemness signatures in naïve CD8 T cells.
  • HEB plays a critical role in promoting the development of immune memory.