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Quantifying changes in the T cell receptor repertoire during thymic development.

Francesco Camaglia1, Arie Ryvkin2, Erez Greenstein2

  • 1Laboratoire de physique de l'École normale supérieure, CNRS, PSL University, Sorbonne Université, and Université de Paris, Paris, France.

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Summary
This summary is machine-generated.

Thymic selection shapes T-cell receptor (TCR) repertoires, but its impact remains unclear. This study reveals that negative selection statistically biases TCR repertoires away from self-recognition rather than eliminating specific self-reactive cells.

Keywords:
immune repertoiresimmunologyinflammationmousephysics of living systemsstatistical analysisthymic selection

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Adaptive immunity relies on T cells distinguishing self from non-self.
  • T-cell maturation in the thymus involves selection based on T-cell receptor (TCR) binding properties.
  • The precise impact of thymic selection on the TCR repertoire is not fully understood.

Purpose of the Study:

  • To investigate the impact of thymic selection on the T-cell receptor repertoire.
  • To characterize TCR repertoire selection across different T-cell developmental stages.
  • To explore the mechanisms underlying T-cell self non-self discrimination.

Main Methods:

  • Utilized transgenic Nur77-mice with a T-cell activation reporter.
  • Employed high-throughput repertoire sequencing to analyze TCRs.
  • Applied statistical inference techniques to characterize repertoire selection.

Main Results:

  • Identified subtle but significant differences in TCR repertoire parameters across maturation stages.
  • Observed that these differences align with known CD4+ and CD8+ T-cell differentiation pathways.
  • Found no evidence for suppression of specific TCR sequences or motifs by negative selection.

Conclusions:

  • Thymic selection statistically biases the TCR repertoire away from self-recognition.
  • Supports a collective or statistical model for T-cell self non-self discrimination.
  • Suggests negative selection operates at a repertoire level, not solely at the single-cell level.