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Nuclear receptor activation leads to functional changes in CTCF-defined chromatin structure [Hi-C]

ABSTRACT: The aim of the project was to investigate the effect of nuclear receptor activation, particularly of the vitamin D receptor, on chromatin structure, and associated functional changes in the transcriptional response of THP-1 cells.

ORGANISM(S): Homo sapiens

PROVIDER: GSE190463 | GEO | 2022/04/27

REPOSITORIES: GEO

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Nuclear receptor activation leads to functional changes in CTCF-defined chromatin structure [HiChIP]

Project description:The aim of the project was to investigate the effect of nuclear receptor activation, particularly of the vitamin D receptor, on CTCF-defined 3D chromatin structure, and associated functional changes in the transcriptional response of THP-1 cells.

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Nuclear receptor activation leads to functional changes in CTCF-defined chromatin structure [Hi-C]

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Nuclear receptor activation leads to functional changes in CTCF-defined chromatin structure

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Genome-wide analysis of vitamin D receptor (VDR) target genes in THP-1 monocytic leucemia cells

Project description:Identification of primary target genes of vitamin D receptor (VDR) in an immune-related cellular model (THP-1 cells) to study, in conjunction with VDR binding data from ChIP-seq, the genome-wide mechanisms of transcriptional regulation by VDR. THP-1 cells were treated 4 h either with 0.1% ethanol (vehicle, control) or 1?,25(OH)2D3 (1,25D)

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Identification of chromatin loops from Hi-C interaction matrices by CTCF-CTCF topology classification.

Project description:Genome-wide profiling of long-range interactions has revealed that the CCCTC-Binding factor (CTCF) often anchors chromatin loops and is enriched at boundaries of the so-called Topologically Associating Domains, which suggests that CTCF is essential in the 3D organization of chromatin. However, the systematic topological classification of pairwise CTCF-CTCF interactions has not been yet explored. Here, we developed a computational pipeline able to classify all CTCF-CTCF pairs according to their chromatin interactions from Hi-C experiments. The interaction profiles of all CTCF-CTCF pairs were further structurally clustered using self-organizing feature maps and their functionality characterized by their epigenetic states. The resulting clusters were then input to a convolutional neural network aiming at the de novo detecting chromatin loops from Hi-C interaction matrices. Our new method, called LOOPbit, is able to automatically detect significant interactions with a higher proportion of enhancer-promoter loops compared to other callers. Our highly specific loop caller adds a new layer of detail to the link between chromatin structure and function.

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Genome-wide analysis of vitamin D receptor (VDR) target genes in THP-1 monocytic leucemia cells

2011-08-17 | GSE27270 | GEO

mRNA-seq in VDR knockout and control THP-1 cells

Project description:The vitamin D receptor (VDR) has been knocked out in monocytic THP-1 cells after stimulation of ko and control cells with the the natural VDR ligand 1,25-dihydroxyvitamin D3 (1,25(OH)2D3), quadruplicate mRNA-seq has been performed

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Transcriptomics of vitamin D treatment effects in Mycobacterium tuberculosis-infected THP-1 cells

Project description:Previous reports have shown low vitamin D serum levels and polymorphisms in the vitamin D receptor (VDR) to be associated with increased risk for TB. Given that 1?,25-dihydroxyvitamin D3 has a role in lipid metabolism control, we tested whether the link between 1?,25-dihydroxyvitamin D3 and tuberculosis involves macrophage lipid metabolism. Since formation of lipid droplets (LD) is a hallmark of lipid dysregulation in M. tuberculosis-infected macrophages, we measured LD content as a readout of altered lipid metabolism in infected THP-1 cells. Induction of LD, which peaked by 24 hours post-infection was prevented by addition of 1?,25-dihydroxyvitamin D3 at the time of infection. To investigate the mechanism of 1?,25-dihydroxyvitamin D3 modulation of LD formation, we analyzed the transcriptome of M. tuberculosis-infected THP-1 cells with and without 1?,25-dihydroxyvitamin D3 treatment. THP-1 cells were cultured in 24-well flat bottom plates, pre-treated with 20ng/ml PMA for 24 h, and incubated with M. tuberculosis H37Rv. After 4 hours of infection, cells were washed to remove extracellular bacteria and treated with 100 nM of 1?,25-dihydroxyvitamin D3. THP-1 cells were collected and analyzed at 24h. 3 biological replicates in each of the 4 groups were prepared: Infected, Infected plus 1?,25-dihydroxyvitamin D3, Non-infected, Non-infected plus 1?,25-dihydroxyvitamin D3.

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