title: Dynamic binding of RBPJ is determined by Notch signaling status.
abstract: Notch signaling plays crucial roles in mediating cell fate choices in all metazoans largely by specifying the transcriptional output of one cell in response to a neighboring cell. The DNA-binding protein RBPJ is the principle effector of this pathway in mammals and, together with the transcription factor moiety of Notch (NICD), regulates the expression of target genes. The prevalent view presumes that RBPJ statically occupies consensus binding sites while exchanging repressors for activators in response to NICD. We present the first specific RBPJ chromatin immunoprecipitation and high-throughput sequencing study in mammalian cells. To dissect the mode of transcriptional regulation by RBPJ and identify its direct targets, whole-genome binding profiles were generated for RBPJ; its coactivator, p300; NICD; and the histone H3 modifications H3 Lys 4 trimethylation (H3K4me3), H3 Lys 4 monomethylation (H3K4me1), and histone H3 Lys 27 acetylation (H3K27ac) in myogenic cells under active or inhibitory Notch signaling conditions. Our results demonstrate dynamic binding of RBPJ in response to Notch activation at essentially all sites co-occupied by NICD. Additionally, we identify a distinct set of sites where RBPJ recruits neither NICD nor p300 and binds DNA statically, irrespective of Notch activity. These findings significantly modify our views on how RBPJ and Notch signaling mediate their activities and consequently impact on cell fate decisions.
authors: Department of Molecular Biology, Faculty of Science, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen, Nijmegen 6525 GA, the Netherlands.
authors: David
authors: D
authors: Castel
authors: Philippos
authors: P
authors: Mourikis
authors: Stefanie J J
authors: SJ
authors: Bartels
authors: Arie B
authors: AB
authors: Brinkman
authors: Shahragim
authors: S
authors: Tajbakhsh
authors: Hendrik G
authors: HG
authors: Stunnenberg
mesh_terms: D000818:Animals; D001665:Binding Sites; D002460:Cell Line; D002843:Chromatin / Q000235:genetics; D055106:Genome-Wide Association Study; D051819:Immunoglobulin J Recombination Signal Sequence-Binding Protein / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D011485:Protein Binding; D051880:Receptors, Notch / Q000378:metabolism*; D050436:Regulatory Elements, Transcriptional / Q000235:genetics; D015398:Signal Transduction
chemical_list: D002843:Chromatin; D051819:Immunoglobulin J Recombination Signal Sequence-Binding Protein; C497571:Rbpj protein, mouse; D051880:Receptors, Notch
keywords: ChIP-seq; NICD; Notch; RNA-seq; Rbpj; p300; skeletal muscle
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