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Related Experiment Video

Updated: Jun 28, 2025

Isolation and Transplantation of Different Aged Murine Thymic Grafts.

Isolation and Transplantation of Different Aged Murine Thymic Grafts.

Published on: May 13, 2015

Transposable elements regulate thymus development and function.

Jean-David Larouche^1,2, Céline M Laumont^3,4, Assya Trofimov^1,5,6,7

¹Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, Canada.

|April 18, 2024

Summary

This summary is machine-generated.

Transposable elements (TEs) are active in the thymus, influencing T-cell development. Orchestrating TE expression in thymic cells is crucial for preventing autoimmunity.

Keywords:

central tolerance genetics genomics human immunology inflammation mouse plasmacytoid dendritic cells thymic epithelial cells thymus transposable elements

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Area of Science:

Genomics
Immunology
Molecular Biology

Background:

Transposable elements (TEs) constitute a significant portion of mammalian genomes.
TEs are highly expressed in medullary thymic epithelial cells (mTECs), crucial for T-cell development.

Purpose of the Study:

To investigate the role of TEs in T-cell development within the thymus.
To elucidate the multiomic interactions of TEs in human and mouse thymic cells.

Main Methods:

Multiomic analyses (transcriptomics, immunopeptidomics) of TEs in human and mouse thymic cells.
Analysis of TE expression patterns across different cell lineages and ages.

Main Results:

TE expression in the human thymus varies with age and cell lineage.
mTECs and plasmacytoid dendritic cells (pDCs) exhibit broad TE repertoires.
TEs in mTECs interact with key transcription factors and generate peptides for thymocyte education.
TE-derived dsRNA in pDCs may activate innate immunity, explaining IFN-α/β secretion.

Conclusions:

TEs interact extensively with the adaptive immune system in the thymus.
Orchestrating TE expression in thymic cells (mTECs, pDCs) is vital for establishing central T-cell tolerance and preventing autoimmunity.