Jpx RNA regulates CTCF anchor site selection and formation of chromosome loops
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA602661 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR10950500_1.fastq.gz | Fastqsanger.gz | |||
| SRR10950500_2.fastq.gz | Fastqsanger.gz | |||
| SRR10950501_1.fastq.gz | Fastqsanger.gz | |||
| SRR10950501_2.fastq.gz | Fastqsanger.gz | |||
| SRR10950502_1.fastq.gz | Fastqsanger.gz |
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Project description:Chromosome loops shift dynamically during development, homeostasis, and disease. CTCF is known to anchor loops and construct 3D genomes, but how anchor sites are selected is not yet understood. Here we unveil Jpx RNA as a determinant of anchor selectivity. Jpx RNA targets thousands of genomic sites, preferentially binding promoters of active genes. Depleting Jpx RNA causes ectopic CTCF binding, massive shifts in chromosome looping, and downregulation of >700 Jpx target genes. Without Jpx, thousands of lost loops are replaced by de novo loops anchored by ectopic CTCF sites. Although Jpx controls CTCF binding on a genome-wide basis, it acts selectively at the subset of developmentally sensitive CTCF sites. Specifically, Jpx targets low-affinity CTCF motifs and displaces CTCF protein through competitive inhibition. We conclude that Jpx acts as a CTCF release factor and shapes the 3D genome by regulating anchor site usage.
2021-12-01 | GSE144056 | GEO
Project description:Chromosome loops shift dynamically during development, homeostasis, and disease. CCCTC-binding factor (CTCF) is known to anchor loops and construct 3D genomes, but how anchor sites are selected is not yet understood. Here, we unveil Jpx RNA as a determinant of anchor selectivity. Jpx RNA targets thousands of genomic sites, preferentially binding promoters of active genes. Depleting Jpx RNA causes ectopic CTCF binding, massive shifts in chromosome looping, and downregulation of >700 Jpx target genes. Without Jpx, thousands of lost loops are replaced by de novo loops anchored by ectopic CTCF sites. Although Jpx controls CTCF binding on a genome-wide basis, it acts selectively at the subset of developmentally sensitive CTCF sites. Specifically, Jpx targets low-affinity CTCF motifs and displaces CTCF protein through competitive inhibition. We conclude that Jpx acts as a CTCF release factor and shapes the 3D genome by regulating anchor site usage.
| S-EPMC8671370 | biostudies-literature
Project description:Background: Recent genome-wide association studies (GWAS) have identified more than 100 loci associated with increased risk of prostate cancer, most of which are in non-coding regions of the genome. Understanding the function of these non-coding risk loci is critical to elucidate the genetic susceptibility to prostate cancer. Results: We generated genome-wide regulatory element maps and performed genome-wide chromosome confirmation capture assays (in situ Hi-C) in normal and tumorigenic prostate cells. Using this information, we annotated the regulatory potential of 2,181 fine-mapped PCa risk-associated SNPs and predicted a set of target genes that are regulated by PCa risk-related H3K27Ac-mediated loops. We next identified PCa risk-associated CTCF sites involved in long-range chromatin loops. We used CRISPR-mediated deletion to remove PCa risk-associated CTCF anchor regions and the CTCF anchor regions looped to the PCa risk-associated CTCF sites; we observed up to 100 fold increases in expression of genes within the loops when the PCa risk-associated CTCF anchor regions were deleted. Conclusions: We have identified GWAS risk loci involved in long-range loops that function to repress gene expression within chromatin loops. Our studies provide new insights into the genetic susceptibility to prostate cancer.
2018-08-15 | GSE118514 | GEO
Project description:Known to regulate chromosome looping on a genome-wide scale, the noncoding Jpx RNA was originally shown to control X-chromosome counting and induce Xist expression during X-chromosome inactivation (XCI). Not fully understood is how Jpx upregulates Xist in coordination with Tsix downregulation in cis. Here, by integrating epigenomic data and polymer modeling in a mouse embryonic stem cell model, we demonstrate that Jpx controls architectural and transcriptional dynamics within anti- and pro-XCI zones of the X-inactivation center. Distinct topological changes occur on the future active (Xa) and inactive (Xi) chromosomes. Jpx binds the enhancer of Tsix on the future Xi and alters loop formation to favor Xist induction, coordinately releasing CTCF from Tsix and Xist in cis on the future Xi. Thus, by controlling a dynamic rewiring of functional loops, Jpx flips a transcriptional switch to control mutually exclusive Tsix and Xist expression in cis.
2025-06-11 | GSE283642 | GEO
Project description:Known to regulate chromosome looping on a genome-wide scale, the noncoding Jpx RNA was originally shown to control X-chromosome counting and induce Xist expression during X-chromosome inactivation (XCI). Not fully understood is how Jpx upregulates Xist in coordination with Tsix downregulation in cis. Here, by integrating epigenomic data and polymer modeling in a mouse embryonic stem cell model, we demonstrate that Jpx controls architectural and transcriptional dynamics within anti- and pro-XCI zones of the X-inactivation center. Distinct topological changes occur on the future active (Xa) and inactive (Xi) chromosomes. Jpx binds the enhancer of Tsix on the future Xi and alters loop formation to favor Xist induction, coordinately releasing CTCF from Tsix and Xist in cis on the future Xi. Thus, by controlling a dynamic rewiring of functional loops, Jpx flips a transcriptional switch to control mutually exclusive Tsix and Xist expression in cis.
2025-06-11 | GSE283641 | GEO
Project description:Known to regulate chromosome looping on a genome-wide scale, the noncoding Jpx RNA was originally shown to control X-chromosome counting and induce Xist expression during X-chromosome inactivation (XCI). Not fully understood is how Jpx upregulates Xist in coordination with Tsix downregulation in cis. Here, by integrating epigenomic data and polymer modeling in a mouse embryonic stem cell model, we demonstrate that Jpx controls architectural and transcriptional dynamics within anti- and pro-XCI zones of the X-inactivation center. Distinct topological changes occur on the future active (Xa) and inactive (Xi) chromosomes. Jpx binds the enhancer of Tsix on the future Xi and alters loop formation to favor Xist induction, coordinately releasing CTCF from Tsix and Xist in cis on the future Xi. Thus, by controlling a dynamic rewiring of functional loops, Jpx flips a transcriptional switch to control mutually exclusive Tsix and Xist expression in cis.
2025-06-11 | GSE225226 | GEO
Project description:Cohesin catalyses the folding of the genome into loops that are anchored by CTCF. The molecular mechanism of how cohesin and CTCF structure the 3D genome has remained unclear. Here we show that a segment within the CTCF N terminus interacts with the SA2-SCC1 subunits of cohesin. A 2.6 Å crystal structure of SA2-SCC1 in complex with CTCF reveals the molecular basis of the interaction. We demonstrate that this interaction is specifically required for CTCF-anchored loops and contributes to the positioning of cohesin at CTCF-binding sites. A similar motif is present in a number of established and novel cohesin ligands, including the cohesin release factor WAPL. Our data suggest that CTCF enables chromatin loop formation by protecting cohesin against loop release. These results provide fundamental insights into the molecular mechanism that enables dynamic regulation of chromatin folding by cohesin and CTCF.
2020-01-07 | GSE126634 | GEO
Project description:Cohesin catalyses the folding of the genome into loops that are anchored by CTCF. The molecular mechanism of how cohesin and CTCF structure the 3D genome has remained unclear. Here we show that a segment within the CTCF N terminus interacts with the SA2-SCC1 subunits of cohesin. A 2.6 Å crystal structure of SA2-SCC1 in complex with CTCF reveals the molecular basis of the interaction. We demonstrate that this interaction is specifically required for CTCF-anchored loops and contributes to the positioning of cohesin at CTCF-binding sites. A similar motif is present in a number of established and novel cohesin ligands, including the cohesin release factor WAPL. Our data suggest that CTCF enables chromatin loop formation by protecting cohesin against loop release. These results provide fundamental insights into the molecular mechanism that enables dynamic regulation of chromatin folding by cohesin and CTCF.
2020-01-07 | GSE126635 | GEO
Project description:Cohesin catalyses the folding of the genome into loops that are anchored by CTCF. The molecular mechanism of how cohesin and CTCF structure the 3D genome has remained unclear. Here we show that a segment within the CTCF N terminus interacts with the SA2-SCC1 subunits of cohesin. A 2.6 Å crystal structure of SA2-SCC1 in complex with CTCF reveals the molecular basis of the interaction. We demonstrate that this interaction is specifically required for CTCF-anchored loops and contributes to the positioning of cohesin at CTCF-binding sites. A similar motif is present in a number of established and novel cohesin ligands, including the cohesin release factor WAPL. Our data suggest that CTCF enables chromatin loop formation by protecting cohesin against loop release. These results provide fundamental insights into the molecular mechanism that enables dynamic regulation of chromatin folding by cohesin and CTCF.
2020-01-07 | GSE126636 | GEO
Project description:The structural basis for cohesin/CTCF anchored loops
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