Enhancers with cooperative Notch binding sites are more resistant to regulation by the Hairless co-repressor.

Autor: Yi Kuang, Anna Pyo, Natanel Eafergan, Brittany Cain, Lisa M Gutzwiller, Ofri Axelrod, Ellen K Gagliani, Matthew T Weirauch, Raphael Kopan, Rhett A Kovall, David Sprinzak, Brian Gebelein
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: PLoS Genetics, Vol 17, Iss 9, p e1009039 (2021)
Druh dokumentu: article
ISSN: 1553-7390
1553-7404
DOI: 10.1371/journal.pgen.1009039
Popis: Notch signaling controls many developmental processes by regulating gene expression. Notch-dependent enhancers recruit activation complexes consisting of the Notch intracellular domain, the Cbf/Su(H)/Lag1 (CSL) transcription factor (TF), and the Mastermind co-factor via two types of DNA sites: monomeric CSL sites and cooperative dimer sites called Su(H) paired sites (SPS). Intriguingly, the CSL TF can also bind co-repressors to negatively regulate transcription via these same sites. Here, we tested how synthetic enhancers with monomeric CSL sites versus dimeric SPSs bind Drosophila Su(H) complexes in vitro and mediate transcriptional outcomes in vivo. Our findings reveal that while the Su(H)/Hairless co-repressor complex similarly binds SPS and CSL sites in an additive manner, the Notch activation complex binds SPSs, but not CSL sites, in a cooperative manner. Moreover, transgenic reporters with SPSs mediate stronger, more consistent transcription and are more resistant to increased Hairless co-repressor expression compared to reporters with the same number of CSL sites. These findings support a model in which SPS containing enhancers preferentially recruit cooperative Notch activation complexes over Hairless repression complexes to ensure consistent target gene activation.
Databáze: Directory of Open Access Journals
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