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Related Experiment Video

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A High-Resolution, Single-Grain, In Vivo Pollen Hydration Bioassay for Arabidopsis thaliana
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Why Aire? Compensating for late bloomers.

Melvin Cohn1

  • 1Conceptual Immunology Group, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA. cohn@salk.edu

European Journal of Immunology
|August 19, 2009
PubMed
Summary
This summary is machine-generated.

Peripheral self-antigen expression in the thymus and by antigen-presenting cells (APCs) is examined. Delayed antigen expression may be an evolutionary strategy to ensure immune system responsiveness before self-tolerance is established.

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Last Updated: Jun 20, 2026

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Published on: June 30, 2023

Area of Science:

  • Immunology
  • Evolutionary Biology
  • Molecular Biology

Background:

  • The thymus is crucial for T cell development and self-tolerance induction.
  • Peripheral antigen-presenting cells (APCs) also play a role in immune regulation.
  • Ectopic expression of self-antigens in these sites is a complex phenomenon.

Purpose of the Study:

  • To investigate the evolutionary selection pressures driving ectopic self-antigen expression.
  • To understand the timing of self-antigen presentation relative to immune system maturation.

Main Methods:

  • This is a commentary, not an experimental study.
  • Analysis of existing literature and immunological principles.
  • Hypothesis generation based on evolutionary and developmental immunology.

Main Results:

  • The commentary proposes a hypothesis regarding the evolutionary advantage of delayed ectopic self-antigen expression.
  • Suggests antigen presentation occurs after the immune system gains responsiveness.

Conclusions:

  • Delayed ectopic self-antigen expression may be an evolutionary mechanism to balance self-tolerance and immune competence.
  • This strategy could prevent autoimmunity during early immune development while ensuring robust immunity later.