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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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Related Experiment Video

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Examination of Thymic Positive and Negative Selection by Flow Cytometry
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Human thymoproteasome variations influence CD8 T cell selection.

Takeshi Nitta1, Yuta Kochi2,3, Ryunosuke Muro1

  • 1Department of Immunology, Graduate School of Medicine and Faculty of Medicine, University of Tokyo, Tokyo 113-0033, Japan.

Science Immunology
|August 8, 2017
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Summary
This summary is machine-generated.

Genetic variations in the proteasome gene PSMB11 impact CD8 T cell development and the risk of autoimmune diseases. This highlights the proteasome

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Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • The proteasome is crucial for protein degradation and generating peptides for Major Histocompatibility Complex (MHC) class I presentation to CD8 T cells.
  • While MHC variations are known to influence T cell selection and autoimmunity, the role of genetic variations in proteasome genes remains underexplored.

Purpose of the Study:

  • To investigate the impact of genetic variations in human proteasome genes, specifically PSMB11, on T cell selection and autoimmunity.
  • To understand the functional consequences of PSMB11 variations on CD8 T cell development and repertoire.

Main Methods:

  • Computational analysis of human proteasome gene variations, focusing on PSMB11.
  • Genome-editing in mice to introduce PSMB11 variations and assess their in vivo effects on CD8 T cell development.
  • Analysis of CD8 T cell repertoire alterations and association with autoimmune disease risk in humans.

Main Results:

  • The PSMB11 gene, encoding the thymus-specific catalytic subunit β5t, showed a high enrichment of functionally disruptive nucleotide changes.
  • Introduction of PSMB11 variations in mice impaired CD8 T cell development.
  • A specific PSMB11 polymorphism altered the mouse CD8 T cell repertoire and was linked to increased autoimmune disease risk in humans.

Conclusions:

  • Proteasome variations, particularly in PSMB11, significantly influence T cell repertoire selection, akin to MHC haplotypes.
  • These proteasome variations may contribute to individual susceptibility to autoimmune diseases.
  • PSMB11 variations represent a novel factor in understanding T cell selection and autoimmunity.