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Transcription Factors Recruit the Cohesin Loader NIPBL to Promote Chromatin Looping and Long-range Gene Regulation

ABSTRACT: The cohesin complex is central to chromatin looping, but mechanisms by which these long-range chromatin interactions are formed and persist remain unclear. We demonstrate that interactions between a transcription factor and the cohesin loader NIPBL regulate enhancer-promoter looping and promote long-range gene regulation. Using mass-spectrometry, genome mapping, and single-molecule tracking methods, we demonstrate that NIPBL and cohesin regulate the dynamics and function of the glucocorticoid receptor (GR). Moreover, glucocorticoid treatment stabilizes NIPBL and cohesin interactions by promoting loop extrusion and chromatin looping. Patient-derived acute myeloid leukemia cells harboring cohesin mutations exhibit a reduced response to glucocorticoids (GCs), suggesting that the GR-NIPBL-cohesin interaction is defective in these patients, and they may be poor candidates for GC treatment.

ORGANISM(S): Mus musculus

PROVIDER: GSE162617 | GEO | 2021/06/01

REPOSITORIES: GEO

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Transcription Factors Recruit the Cohesin Loader NIPBL to Promote Chromatin Looping and Long-range Gene Regulation

Project description:Transcription Factors Recruit the Cohesin Loader NIPBL to Promote Chromatin Looping and Long-range Gene Regulation

| PRJNA682404 | ENA

Co-depletion of NIPBL and WAPL balance cohesin activity to correct gene misexpression

Project description:The relationship between cohesin-mediated chromatin looping and gene expression remains unclear. NIPBL and WAPL are two opposing regulators of cohesin activity; depletion of either is associated with changes in both chromatin folding and transcription across a wide range of cell types. However, a direct comparison of their individual and combined effects on gene expression in the same cell type is lacking. We find that NIPBL or WAPL depletion in human HCT116 cells each alter the expression of ~2,000 genes, with only ~30% of the genes shared between the conditions. We find that clusters of differentially expressed genes within the same topologically associated domain (TAD) show coordinated misexpression, suggesting some genomic domains are especially sensitive to either more or less cohesin. Finally, co-depletion of NIPBL and WAPL restores the majority of gene misexpression as compared to either knockdown alone. A similar set of NIPBL-sensitive genes are rescued following CTCF co-depletion. Together, this indicates that altered transcription due to reduced cohesin activity can be functionally offset by removal of either its negative regulator (WAPL) or the physical barriers (CTCF) that restrict loop-extrusion events.

2022-11-03 | GSE200773 | GEO

ChIP-Seq for NIPBL for SMC1 in human lymphoblastoid cells (hLCLs)

Project description:The gene expression program is regulated by a cell-type specific chromosome architecture. The connection between enhancer and promoter regions is dependent on a protein complex containing Nipbl, Mediator and Cohesin. To gain insights into the chromosome architecture of human differentiated cells, we profiled NIPBL and SMC1 in lymphoblastoid cells (LCLs). DNA was enriched from hLCLs and chromatin immunoprecipitations (ChIPs) were analyzed by Solexa sequencing. ChIPs were performed using an antibody against NIPBL and SMC1. Whole cell extract is provided for background.

2012-06-01 | E-GEOD-38395 | biostudies-arrayexpress

MAU2 and NIPBL variants in Cornelia de Lange syndrome reveal MAU2-independent loading of cohesin and uncover protective mechanisms against early truncating mutations in NIPBL

Project description:For its association with chromatin, the cohesin complex depends on a heterodimer formed by NIPBL and MAU2. Variants in NIPBL are the main cause of CdLS and result in NIPBL haploinsufficiency. Using CRISPR, we generated cells homozygous for an out-of-frame duplication in NIPBL. Remarkably, alternative translation initiation rescued NIPBL expression in these cells and produced an N-terminally truncated NIPBL that lacks MAU2-interaction domain, causing a dramatic reduction of MAU2 protein levels while a lot of NIPBL functions remain intact.

2020-06-10 | GSE122299 | GEO

Response of cohesin STAG1 and STAG2 to reduction of NIPBL levels [Hi-C]

Project description:Cohesin mediates sister chromatid cohesion and organizes the genome through the formation of chromatin loops. Two versions of the complex carrying either STAG1 or STAG2 show overlapping and specific functions and both are required to fulfill embryonic development. Cohesin-STAG1 displays longer residence time on chromatin that depends on CTCF and ESCO1 and establishes longer, long-lived chromatin loops together with CTCF. Cohesin-STAG2 shows a preferential interaction with WAPL and mediates shorter loops involved in tissue-specific transcription independently of CTCF. Here we show that the two variants respond in opposite ways to knock down of NIPBL, the putative cohesin loader that is also essential for loop extrusion. Cohesin-STAG1 levels increase on chromatin under this condition and the complex accumulates further at CTCF positions while cohesin-STAG2 is diminished genome-wide. Our data support a model in which NIPBL is not required for association of cohesin with chromatin but it is for loop extrusion, which in turn facilitates stabilization of cohesin-STAG2 at CTCF positions after being loaded elsewhere. In contrast, cohesin-STAG1 is preferentially loaded at CTCF sites independently of NIPBL. Nevertheless, loop formation by these chromatin-bound complexes is impaired and gene expression is severely affected, resembling alterations in Cornelia de Lange patients

2023-01-30 | GSE207115 | GEO

Response of cohesin STAG1 and STAG2 to reduction of NIPBL levels [ChIP-Seq]

2023-01-30 | GSE207113 | GEO

Response of cohesin STAG1 and STAG2 to reduction of NIPBL levels [RNA-Seq]

2023-01-30 | GSE207110 | GEO

PAXIP1 and STAG2 converge to maintain 3D genome archi-tecture and facilitate promoter/enhancer contacts to enable stress hormone-dependent transcription

Project description:How steroid hormone receptors (SHRs) orchestrate transcriptional activity remains only partly understood. Upon activation, SHRs bind the genome and recruit their co-regulators, crucial to induce gene expression. However, it remains unknown which components of the SHR-recruited coregulator complex are essential to drive transcription following hormonal stimuli. Through a FACS-based genome-wide CRISPR screen, we comprehensively dissected the Glucocorticoid Receptor (GR) co-regulatory complex involved in gene-target regulation. We describe a novel functional cross-talk between PAXIP1 and the cohesin subunit STAG2 that is critical for regulation of gene expression by GR. Without altering the GR cistrome, PAXIP1 and STAG2 depletion alter the GR transcriptome, by impairing the recruitment of 3D-genome organization proteins to the GR complex. Importantly, we demonstrate that PAXIP1 is required for stability of cohesin on the genome, its localization to GR-occupied sites, and maintenance of enhancer-promoter interactions. Moreover, in lung cancer, where GR acts as tumor suppressor, PAXIP1/STAG2 loss enhances GR-mediated tumor suppressor activity by modifying local chromatin interactions. All together, we introduce PAXIP1 and STAG2 as novel co-regulators of GR, required to maintain 3D-genome architecture and drive the GR transcriptional programme following hormonal stimuli.

2023-10-24 | PXD038902 | Pride

Decreasing Wapl dosage partially corrects transcriptome phenotypes in Nipbl-/+ embryonic mouse brain

Project description:Cohesin rings interact with DNA and modulate expression of thousands of genes. NIPBL loads cohesin onto chromosomes and WAPL takes it off. Heterozygous mutations in NIPBL lead to a developmental disorder called Cornelia de Lange syndrome. Nipbl heterozygous mice are a good model for this disease. Mutations in WAPL were not known to cause disease or gene expression changes in mammals. Here we show dysregulation of >1000 genes in Wapl-/+embryonic mouse brains. The patterns of dysregulation are highly similar in Wapl and Nipbl heterozygotes, suggesting that Wapl mutations may cause disease in humans. Since WAPL and NIPBL have opposite effects on cohesin’s association with DNA, we asked whether a heterozygous Wapl mutation could correct phenotypes seen in Nipbl heterozygous mice. In fact, both gene expression and embryonic growth are partially corrected. Our data are consistent with the view that cohesin dynamics play a key role in regulating gene expression.

2022-10-11 | GSE203014 | GEO

Gene expression changes in limb buds of Nipbl-haploinsufficient mice

Project description:Multiple genes are dysregulated in hindlimb buds of Nipbl-deficient embryos. In all, more than 1000 limb bud genes were found to be significantly altered in expression by microarray analysis of E10.5 mouse hindlimb buds. Small changes in expression (mostly decreases) were observed for genes involved in FGF, BMP, and SHH pathways, as well as numerous genes involved in the Wnt/planar cell polarity signaling pathway. Genes involved in the Mediator complex, Cohesin function, and Hox gene expression and functions were also dysregulated in Nipbl deficient limb buds. Microarray analysis using RNA extracted from E10.5 hindlimb limb buds harvested from stage-matched Nipbl+/- (n=12) and wildtype (n=12)

2014-08-30 | E-GEOD-60932 | biostudies-arrayexpress

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