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Journal Article
Research Support, Non-U.S. Gov't
Essential Roles of SATB1 in Specifying T Lymphocyte Subsets.
Cell Reports 2017 May 10
T cell receptor (TCR) signaling by MHC class I and II induces thymocytes to acquire cytotoxic and helper fates via the induction of Runx3 and ThPOK transcription factors, respectively. The mechanisms by which TCR signaling is translated into transcriptional programs for each cell fate remain elusive. Here, we show that, in post-selection thymocytes, a genome organizer, SATB1, activates genes for lineage-specifying factors, including ThPOK, Runx3, CD4, CD8, and Treg factor Foxp3, via regulating enhancers in these genes in a locus-specific manner. Indeed, SATB1-deficient thymocytes are partially re-directed into inappropriate T lineages after both MHC class I- and II-mediated selection, and they fail to generate NKT and Treg subsets. Despite its essential role in activating enhancers for the gene encoding ThPOK in TCR-signaled thymocytes, SATB1 becomes dispensable for maintaining ThPOK in CD4+ T cells. Collectively, our findings demonstrate that SATB1 shapes the primary T cell pool by directing lineage-specific transcriptional programs in the thymus.
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