Histone modification of melanoma cell lines and cohesin level after knockdown of NIPBL
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA971575 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR24508239_1.fastq.gz | Fastqsanger.gz | |||
| SRR24508239_2.fastq.gz | Fastqsanger.gz | |||
| SRR24508240_1.fastq.gz | Fastqsanger.gz | |||
| SRR24508240_2.fastq.gz | Fastqsanger.gz | |||
| SRR24508241_1.fastq.gz | Fastqsanger.gz |
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Project description:While the cohesin complex is a key player in genome architecture, how it localizes to specific chromatin sites is not well understood. Recently, we and others have proposed that direct interactions with transcription factors (TFs) lead to the localization of the cohesin-loader complex (NIPBL/MAU2) within enhancers. Here, we identify two clusters of protein-protein interaction (PPI) motifs within the NIPBL sequence that regulate NIPBL dynamics, interactome, and NIPBL-dependent transcriptional programs. These PPIMs directly interact with chromatin-associated proteins, including TFs and one of them is necessary for the maintenance of the NIPBL-MAU2 heterodimer. Finally, using the glucocorticoid receptor (GR) as a model, we investigate its interaction surfaces with NIPBL and MAU2 using AlphaFold2 and surface plasmon resonance to uncover a TF-NIPBL-MAU2 ternary complex and present its importance in GR-dependent gene regulation.
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Project description:Chromatin modification of melanoma cell line after knockdown of NIPBL
| PRJNA971574 | ENA
Project description:Cohesin complex shapes 3D genome organization by extruding DNA loops, yet the mechanisms underlying its chromatin entry remain poorly understood. Here, we reveal that the cohesin loader NIPBL exhibits highly tissue-specific chromatin binding, in stark contrast to the conserved binding profiles of CTCF and RAD21. We identify pioneer transcription factors (TFs), notably FOXA1, as key mediators of NIPBL recruitment to chromatin. FOXA1 directs NIPBL to intra-TAD regions, enabling symmetric loop extrusion, while factors like ETS1 target NIPBL to TAD boundaries, supporting one-sided extrusion. Rapid depletion of FOXA1 disrupts NIPBL binding and intra-TAD loops, whereas loss of NIPBL impairs both intra-TAD and inter-TAD interactions, highlighting their roles in 3D genome folding. Strikingly, a recurrent FOXA1 mutation (R219S) in prostate cancer redirects NIPBL to TAD boundaries by recognizing a non-canonical motif, fostering a more insulated and tumor-aggressive genome. Evolutionary analysis points to a potential conserved role for TF-NIPBL cooperation in cohesin chromatin entry across species with tissue-specific adaptations. Our findings reveal that pioneer factors orchestrate cohesin loading to shape tissue-specific chromatin accessibility and 3D genome dynamics, a mechanism hijacked in diseases like cancer to rewire gene expression.
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Project description:The cohesin complex is a key player in dynamic genome architecture adjustments. The loading of the cohesin complex on chromatin is believed to be achieved by the cohesin-loader Nipped-B homolog (NIPBL). Recently, we and others proposed that direct interactions with transcriptions factors (TFs) would lead to accurate positioning of NIPBL on the DNA. In this study, we identified remarkable protein-protein interaction motifs (PPIMs) in the NIPBL sequence. Mutations of those motifs dramatically alters: (i) the global NIPBL chromatin binding, (ii) the NIPBL-dependent transcriptional program and (iii) the NIPBL proteome network including TFs. While we found that the MAU2/NIPBL interaction was relying on those PPIMs, we further discovered that MAU2 was directly interacting with dozens of TFs. Concomitantly, we found that numerous TFs were also able to interact with NIPBL through PPIMs. Finally, using nuclear receptors as models and then focusing on the Glucocorticoid Receptor (GR), we mechanistically dissect a trimeric complex formed by GR, NIPBL and MAU2 and investigate the importance of those interactions for GR transcriptional program.
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Project description:Cohesin complex shapes 3D genome organization by extruding DNA loops, yet the mechanisms underlying its chromatin entry remain poorly understood. Here, we reveal that the cohesin loader NIPBL exhibits highly tissue-specific chromatin binding, in stark contrast to the conserved binding profiles of CTCF and RAD21. We identify pioneer transcription factors (TFs), notably FOXA1, as key mediators of NIPBL recruitment to chromatin. FOXA1 directs NIPBL to intra-TAD regions, enabling symmetric loop extrusion, while factors like ETS1 target NIPBL to TAD boundaries, supporting one-sided extrusion. Rapid depletion of FOXA1 disrupts NIPBL binding and intra-TAD loops, whereas loss of NIPBL impairs both intra-TAD and inter-TAD interactions, highlighting their roles in 3D genome folding. Strikingly, a recurrent FOXA1 mutation (R219S) in prostate cancer redirects NIPBL to TAD boundaries by recognizing a non-canonical motif, fostering a more insulated and tumor-aggressive genome. Evolutionary analysis points to a potential conserved role for TF-NIPBL cooperation in cohesin chromatin entry across species with tissue-specific adaptations. Our findings reveal that pioneer factors orchestrate cohesin loading to shape tissue-specific chromatin accessibility and 3D genome dynamics, a mechanism hijacked in diseases like cancer to rewire gene expression.
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