TY - JOUR
T1 - TCF-1 and HEB cooperate to establish the epigenetic and transcription profiles of CD4 + CD8 + thymocytes
AU - Emmanuel, Akinola Olumide
AU - Arnovitz, Stephen
AU - Haghi, Leila
AU - Mathur, Priya S.
AU - Mondal, Soumi
AU - Quandt, Jasmin
AU - Okoreeh, Michael K.
AU - Maienschein-Cline, Mark
AU - Khazaie, Khashayarsha
AU - Dose, Marei
AU - Gounari, Fotini
N1 - Publisher Copyright:
© 2018, The Author(s), under exclusive licence to Springer Nature America, Inc.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - Thymocyte development requires a complex orchestration of multiple transcription factors. Ablating either TCF-1 or HEB in CD4 + CD8 + thymocytes elicits similar developmental outcomes including increased proliferation, decreased survival, and fewer late Tcra rearrangements. Here, we provide a mechanistic explanation for these similarities by showing that TCF-1 and HEB share ~7,000 DNA-binding sites genome wide and promote chromatin accessibility. The binding of both TCF-1 and HEB was required at these shared sites for epigenetic and transcriptional gene regulation. Binding of TCF-1 and HEB to their conserved motifs in the enhancer regions of genes associated with T cell differentiation promoted their expression. Binding to sites lacking conserved motifs in the promoter regions of cell-cycle-associated genes limited proliferation. TCF-1 displaced nucleosomes, allowing for chromatin accessibility. Importantly, TCF-1 inhibited Notch signaling and consequently protected HEB from Notch-mediated proteasomal degradation. Thus, TCF-1 shifts nucleosomes and safeguards HEB, thereby enabling their cooperation in establishing the epigenetic and transcription profiles of CD4 + CD8 + thymocytes.
AB - Thymocyte development requires a complex orchestration of multiple transcription factors. Ablating either TCF-1 or HEB in CD4 + CD8 + thymocytes elicits similar developmental outcomes including increased proliferation, decreased survival, and fewer late Tcra rearrangements. Here, we provide a mechanistic explanation for these similarities by showing that TCF-1 and HEB share ~7,000 DNA-binding sites genome wide and promote chromatin accessibility. The binding of both TCF-1 and HEB was required at these shared sites for epigenetic and transcriptional gene regulation. Binding of TCF-1 and HEB to their conserved motifs in the enhancer regions of genes associated with T cell differentiation promoted their expression. Binding to sites lacking conserved motifs in the promoter regions of cell-cycle-associated genes limited proliferation. TCF-1 displaced nucleosomes, allowing for chromatin accessibility. Importantly, TCF-1 inhibited Notch signaling and consequently protected HEB from Notch-mediated proteasomal degradation. Thus, TCF-1 shifts nucleosomes and safeguards HEB, thereby enabling their cooperation in establishing the epigenetic and transcription profiles of CD4 + CD8 + thymocytes.
UR - http://www.scopus.com/inward/record.url?scp=85056458014&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85056458014&partnerID=8YFLogxK
U2 - 10.1038/s41590-018-0254-4
DO - 10.1038/s41590-018-0254-4
M3 - Article
C2 - 30420627
AN - SCOPUS:85056458014
SN - 1529-2908
VL - 19
SP - 1366
EP - 1378
JO - Nature immunology
JF - Nature immunology
IS - 12
ER -