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Cohesin and CTCF control chromosomal contact dynamics in living cells [capture C]

ABSTRACT: Cohesin and CTCF control chromosomal contact dynamics in living cells [capture C]

PROVIDER: PRJNA809406 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR18139009_1.fastq.gz	Fastqsanger.gz
	SRR18139009_2.fastq.gz	Fastqsanger.gz
	SRR18139010_1.fastq.gz	Fastqsanger.gz
	SRR18139010_2.fastq.gz	Fastqsanger.gz
	SRR18139011_1.fastq.gz	Fastqsanger.gz

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Cohesin and CTCF control chromosomal contact dynamics in living cells

Project description:Cohesin and CTCF control chromosomal contact dynamics in living cells

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Cohesin and CTCF control chromosomal contact dynamics in living cells [capture C]

Project description:Mammalian chromosomes are partitioned into topologically associating domains (TADs) by the loop-extrusion activity of cohesin that is blocked at specific DNA sites bound by CTCF. Chromosome structure inside TADs is highly variable in single cells, yet little is known about its temporal dynamics, how it influences the rates and durations of chromosomal contacts, and how it depends on CTCF and cohesin. To address these questions we combine two quantitative live-cell imaging strategies that minimize locus-specific confounding effects. We show that loop extrusion by cohesin globally reduces the mobility of the chromatin fiber in living cells, while also increasing the rates of formation and durations of contacts between sequences inside the same TAD. Quantitative analysis of high-resolution microscopy data reveals that contacts assemble and disassemble frequently in the course of the cell cycle, and become substantially more frequent and longer in the presence of convergent CTCF sites. Comparison with polymer modeling additionally reveals that cohesin-mediated CTCF loops last around 10 minutes on average. Our data support the notion that chromosome structure within TADs is highly dynamic and provide a quantitative framework for understanding the principles that link chromosome structure to biological function.

2022-02-27 | GSE197234 | GEO

Cohesin and CTCF control chromosomal contact dynamics in living cells [integration sites]

Project description:Cohesin and CTCF control chromosomal contact dynamics in living cells [integration sites]

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Cohesin and CTCF control chromosomal contact dynamics in living cells [4C-seq]

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Cohesin and CTCF control chromosomal contact dynamics in living cells [Hi-C]

Project description:Cohesin and CTCF control chromosomal contact dynamics in living cells [Hi-C]

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Cohesin and CTCF control chromosomal contact dynamics in living cells [4C-seq]

2022-02-27 | GSE197226 | GEO

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Cohesin and CTCF control chromosomal contact dynamics in living cells [Hi-C]

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Cohesin and CTCF control chromosomal contact dynamics in living cells

Project description:This SuperSeries is composed of the SubSeries listed below.

2022-02-27 | GSE197238 | GEO

Tissue-specific CTCF/Cohesin-mediated chromatin architecture delimits enhancer interactions and function in vivo (Capture-C"

Project description:The genome is organized via CTCF/cohesin binding sites, which partition chromosomes into 1-5Mb topologically associated domains (TADs), and further into smaller contact sub-domains within TADs (sub-TADs; 40-1000kb). Here we examined in vivo an ~80kb sub-TAD, containing the mouse α-globin gene cluster, lying within a ~1Mb TAD. We find that the sub-TAD is flanked by predominantly convergent CTCF/cohesin sites which are ubiquitously bound by CTCF but only interact during erythropoiesis, defining a self-interacting erythroid compartment. Whereas the α-globin regulatory elements normally act solely on promoters downstream of the enhancers, removal of a conserved upstream CTCF/cohesin boundary extends the sub-TAD to the adjacent upstream CTCF/cohesin binding site. The α-globin enhancers now interact with the flanking chromatin, upregulating expression of genes within this extended sub-TAD. Rather than acting solely as a barrier to chromatin modification, CTCF/cohesin boundaries in this sub-TAD regulate both directionality and specificity of enhancer interactions with surrounding promoters.

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