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Aberrant RNA sensing in regulatory T cells causes systemic autoimmunity.

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Aberrant RNA sensing disrupts regulatory T cells (Tregs), leading to type I interferonopathies. This study reveals how ADAR1 deficiency and MDA5 mutations impair Treg homeostasis, causing severe autoimmune disease.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Type I interferonopathies are autoimmune diseases driven by chronic nucleic acid sensing.
  • Regulatory T cells (Tregs) are crucial for immune homeostasis.
  • Mutations in ADAR1 and IFIH1 (MDA5) are linked to type I interferonopathies.

Purpose of the Study:

  • To investigate the role of aberrant RNA sensing in Treg dysregulation within type I interferonopathies.
  • To elucidate the mechanisms by which ADAR1 and MDA5 impact Treg function and survival.

Main Methods:

  • Analysis of patients with type I interferonopathies.
  • Murine models with T cell-specific gene modifications (Adar1 deletion, MDA5 gain-of-function).
  • Assessment of Treg populations, apoptosis, and autoimmune phenotypes.

Main Results:

  • Reduced Tregs observed in patients with ADAR1 or MDA5 mutations.
  • Treg-specific Adar1 deletion in mice led to Treg loss and lethal autoimmunity.
  • Treg-specific MDA5 gain-of-function in mice caused Treg apoptosis and severe autoimmunity.
  • ADAR1 deficiency impacts Tregs through both MDA5 and PKR pathways.

Conclusions:

  • Dysregulation of Treg homeostasis by intrinsic aberrant RNA sensing is a key factor in type I interferonopathies.
  • ADAR1 and MDA5 play critical roles in maintaining Treg function and preventing autoimmunity.