Deciphering a genetic control of Human Thymopoiesis at the TCRA-TCRD Locus (Hu-Thy-L) – Hu-Thy-L
The Hu-Thy-L project aims to unravel how genetic variation impacts on chromatin accessibility, epigenetic modifications and/or transcription factors binding, leading to differences in thymocyte differentiation. The understanding of a “fine tuning” of thymopoiesis may improve our basic knowledge of human T cell development with a broad impact in the setting of immune responses and vaccines. It could also provide an insight into the mechanisms of oncogenic translocation in T acute lymphocytic leukemias.
The thymus is the primary organ responsible for the generation of conventional T cells (aß T cells) as well as unconventional T cells including gd T cells and invariant NKT. In a population immunology approach, we characterized the variability of thymic function among 1,000 healthy adults of the Milieu Intérieur cohort. GWAS revealed an association between thymopoiesis and a common variant within the T-cell receptor TCRA-TCRD locus, between the DD2 and DD3 gene segments in a region where TCR rearrangements start in early thymic progenitors. This region is also involved in TCRD-oncogene rearrangements that occur during early thymopoiesis. The aim of the Hu-Thy-L project is to unravel how this genetic variation could be associated with differences in chromatin accessibility, epigenetic changes and/or transcription factors binding, leading to differences in thymocyte differentiation. The understanding of a “fine tuning” of thymopoiesis may improve our basic knowledge of human T cell development with a broad impact in the setting of immune responses. It could also provide an insight into the mechanisms of oncogenic translocation involving the TCRD locus in T-ALL.
Project coordination
Antoine Toubert (Ecotaxie, Microenvironnement et developpement lymphocytaire / Microenvironment, lymphocyte development and homing)
The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.
Partnership
EMiLy Ecotaxie, Microenvironnement et developpement lymphocytaire / Microenvironment, lymphocyte development and homing
TAGC Théories et approches de la complexité génomique
INSERM - U 1151 INEM Institut National de la Santé et de la Recherche Médicale
IP-UII IP-Unité d'Immunité Innée
Help of the ANR 620,312 euros
Beginning and duration of the scientific project:
September 2021
- 36 Months