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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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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Multimerizing transcription factors FOXP3 and AIRE as chromatin architectural regulators.

Fangwei Leng1,2, Yu-San Huoh3, Sun Hur4,5,6

  • 1School of Basic Medicine Sciences, Capital Medical University, Beijing, China. fangwei.leng@cimrbj.ac.cn.

Nature Immunology
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Summary

Autoimmune regulator (AIRE) and FOXP3 are crucial for immune tolerance. New research shows both proteins act as chromatin organizers, shaping gene expression through multimerization and interaction with DNA, reinforcing immune tolerance mechanisms.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Immune tolerance relies on distinct transcriptional programs driven by autoimmune regulator (AIRE) and FOXP3.
  • AIRE facilitates negative selection of autoreactive T cells via antigen presentation in the thymus.
  • FOXP3 governs the immune-suppressive functions of regulatory T cells.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which AIRE and FOXP3 interact with the genome and regulate transcription.
  • To highlight recent advances in understanding the structural, biochemical, and genomic functions of AIRE and FOXP3.
  • To review their roles as chromatin organizers in maintaining immune tolerance.

Main Methods:

  • Structural and biochemical analyses to determine protein multimerization.
  • Genomic studies to map DNA interactions and transcriptional targets.
  • Comparative analysis of AIRE and FOXP3 functions in distinct immunological contexts.

Main Results:

  • Both AIRE and FOXP3 form homomultimers that function as chromatin organizers.
  • These proteins interact with repetitive DNA elements and enhancers.
  • They reinforce existing chromatin landscapes to coordinate gene expression programs.

Conclusions:

  • AIRE and FOXP3 share a common principle as multimeric chromatin organizers, despite distinct roles in immune tolerance.
  • Their ability to shape chromatin architecture is essential for orchestrating transcriptional programs.
  • Understanding these mechanisms provides new insights into maintaining central and peripheral immune tolerance.