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T Cell Activation and Clonal Selection01:22

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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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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Related Experiment Video

Updated: Apr 12, 2026

Use of Single Chain MHC Technology to Investigate Co-agonism in Human CD8+ T Cell Activation
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Human gamma delta T cells: Evolution and ligand recognition.

Erin J Adams1, Siyi Gu2, Adrienne M Luoma3

  • 1Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA; Committee on Immunology, University of Chicago, Chicago, IL 60637, USA; Committee on Cancer Biology, University of Chicago, Chicago, IL 60637, USA.

Cellular Immunology
|May 21, 2015
PubMed
Summary

Human gamma delta (γδ) T cells are mysterious due to limited known antigens and tracking difficulties. This review explores their evolution and antigen recognition, highlighting co-evolution with ligands.

Keywords:
B30.2ButyrophilinCD1dPhosphoantigensT cell receptorT cellsVdelta1Vgamma9Vdelta2

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Area of Science:

  • Immunology
  • Evolutionary Biology
  • T cell biology

Background:

  • The human gamma delta (γδ) T cell lineage is poorly understood.
  • Challenges include identifying specific antigens, understanding non-canonical responses, and in vivo tracking.
  • This necessitates a deeper understanding of γδ T cell function and evolution.

Purpose of the Study:

  • To review comparative evolutionary analyses of primate V, D, and J gene segments for γδ T cells.
  • To contrast evolutionary findings with recent advances in defining antigen recognition by human γδ T cell populations.
  • To explore the co-evolutionary relationship between γδ T cell receptors (TCRs) and their ligands.

Main Methods:

  • Comparative evolutionary analysis of primate V, D, and J gene segments.
  • Review of recent literature on antigen recognition by human γδ T cells.
  • Analysis of selection signatures at Vδ and Vγ gene loci.

Main Results:

  • Identified signatures of purifying and diversifying selection at Vδ and Vγ gene loci.
  • Contextualized these findings with Vδ1+ γδ T cell recognition of CD1d-presented lipids.
  • Detailed Vγ9Vδ2 T cell modulation by pyrophosphate-based phosphoantigens via butyrophilin BTN3A.

Conclusions:

  • Evidence suggests co-evolution between γδ TCRs and their ligands.
  • The inherent diversity of recombined γδ TCRs is crucial for effective ligand surveillance.
  • Further research is needed to fully elucidate the complexities of the γδ T cell lineage.