Essential Roles of SATB1 in Specifying T Lymphocyte Subsets

Kiyokazu Kakugawa, Satoshi Kojo, Hirokazu Tanaka, Wooseok Seo, Takaho A. Endo, Yohko Kitagawa, Sawako Muroi, Mari Tenno, Nighat Yasmin, Yoshinori Kohwi, Shimon Sakaguchi, Terumi Kowhi-Shigematsu, Ichiro Taniuchi

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1176-1188
Number of pages13
JournalCell Reports
Volume19
Issue number6
DOIs
Publication statusPublished - May 9 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

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