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Learn MoreNatural intraepithelial lymphocytes (IELs) are thymus-derived adaptive immune cells, which are important contributors to intestinal immune homeostasis. Similar to other innate-like T cells they are induced in the thymus through high-avidity interaction that would otherwise lead to clonal deletion in conventional CD4 and CD8 T cells. By applying single-cell RNA-sequencing (scRNA-seq) on a heterogeneous population of IEL precursors (IELPs) we define a developmental trajectory that identifies Id3 as a novel regulator of IELP development and shows that all natural TCR+ IELPs progress through a PD-1 stage as a result of strong agonist selection. Furthermore, with the use of newly developed PD-1 fate map and conditional T-bet knockout mice we demonstrate that this PD-1 stage precedes the induction of T-bet. The transition from PD-1 to T-bet is regulated by the transcription factor C-Myc, as T cell-specific conditional C-myc knockout mice lack PD-1-T-bet+ IELPs, while PD-1+T-bet- IELPs are still present. In summary, our results provide a high-resolution molecular framework for thymic IEL development and deepen our understanding of this still elusive cell type. SOURCE: Patrice Zeis (zeis@ie-freiburg.mpg.de) - Dominic Grün Max Planck Institute of Immunobiology and Epigenetics
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