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Medullary thymic epithelial cells (mTECs) regulate self-tolerance by expressing tissue-restricted antigens (TRAs). This study reveals recurring TRA co-expression patterns in mTECs, coordinated by chromatin accessibility, ensuring comprehensive self-representation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Self-tolerance is crucial for preventing autoimmunity.
  • Medullary thymic epithelial cells (mTECs) express tissue-restricted antigens (TRAs) to induce self-tolerance.
  • The regulation of TRA expression at the single-cell and population levels in mTECs is not well understood.

Purpose of the Study:

  • To investigate the regulatory mechanisms of TRA expression in mTECs.
  • To understand how single-cell expression patterns of TRAs are coordinated at the population level.
  • To elucidate the role of chromatin accessibility in TRA expression patterns.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) was employed to analyze TRA expression in mTECs.
  • Genomic clustering and chromatin accessibility were assessed for co-expressed TRA genes.

Main Results:

  • Numerous recurring patterns of TRA co-expression were identified in subsets of mTECs.
  • Co-expressed TRA genes were found to be genomically clustered.
  • Enhanced chromatin accessibility was observed in regions with co-expressed TRA genes.

Conclusions:

  • TRA expression in mTECs is a coordinated process, not random.
  • Local chromatin remodeling may play a significant role in regulating TRA co-expression patterns.
  • These coordinated patterns ensure a comprehensive representation of the immunological self, crucial for maintaining self-tolerance.