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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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TYK2 :p.Pro1104Ala Variant Protects Against Autoimmunity by Modulating Immune Cell Levels.

Maristella Steri1, Valeria Orrù1, Carlo Sidore1

  • 1Institute of Genetic and Biomedical Research (IRGB), Italian National Research Council (CNR), Monserrato, Sardinia, Italy.

Immunology
|January 21, 2025
PubMed
Summary
This summary is machine-generated.

The TYK2:p.Pro1104Ala variant increases regulatory T cells and naive T and B lymphocytes, reducing immune activation. This mechanism explains its protective effect against autoimmune diseases.

Keywords:
TYK2autoimmunityimmune cell levelsimmunophenotypingnaïve cells

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Area of Science:

  • Immunology
  • Genetics
  • Autoimmunity

Background:

  • The TYK2:p.Pro1104Ala (rs34536443) hypomorph variant is linked to protection from autoimmune disorders.
  • Understanding its mechanism is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the cellular mechanism by which the TYK2:p.Pro1104Ala variant confers protection against autoimmunity.
  • To determine the variant's effect on immune cell levels in the general population.

Main Methods:

  • Analysis of immune cell levels in a general human population.
  • Association studies correlating the TYK2:p.Pro1104Ala variant with specific immune cell subsets.

Main Results:

  • The variant is associated with altered immune cell levels, specifically higher T and B lymphocytes, particularly the naive compartment.
  • Increased levels of regulatory CD4+ T cells were observed.
  • The variant appears to decrease overall immune activation.

Conclusions:

  • The TYK2:p.Pro1104Ala variant protects against autoimmunity by reducing immune activation through modulation of T and B lymphocyte levels.
  • This study supports TYK2 as a potential therapeutic target for autoimmune conditions.