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Dynamic chromatin accessibility landscape changes following interleukin-1 stimulation

ABSTRACT: Dynamic chromatin accessibility landscape changes following interleukin-1 stimulation

PROVIDER: PRJNA603785 | ENA |

REPOSITORIES: ENA

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Dynamic chromatin accessibility landscape changes following interleukin-1 stimulation

Project description:Dynamic chromatin accessibility landscape changes following interleukin-1 stimulation

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Dynamic chromatin accessibility landscape changes following interleukin-1 stimulation

Project description:Genome-wide methods for examining chromatin modification provide detailed information on regulatory regions of the genome. Dynamic modifications of chromatin allow rapid access of the gene regulatory machinery to condensed genomic regions facilitating subsequent gene expression. Inflammatory cytokine stimulation of cells can cause rapid gene expression changes through direct signalling pathway-mediated transcription factor activation and regulatory element binding.

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Dynamic chromatin accessibility landscape changes following interleukin-1 stimulation

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Dynamic chromatin accessibility landscape changes following interleukin-1 stimulation.

Project description:Dynamic modifications of chromatin allow rapid access of the gene regulatory machinery to condensed genomic regions facilitating subsequent gene expression. Inflammatory cytokine stimulation of cells can cause rapid gene expression changes through direct signalling pathway-mediated transcription factor activation and regulatory element binding. Here we used the Assay for Transposase Accessible Chromatin with high-throughput sequencing (ATAC-seq) to assess regions of the genome that are differentially accessible following treatment of cells with interleukin-1 (IL-1). We identified 126,483 open chromatin regions, with 241 regions significantly differentially accessible following stimulation, with 64 and 177 more or less accessible, respectively. These differentially accessible regions predominantly correspond to regions of the genome marked as enhancers. Motif searching identified an overrepresentation of a number of transcription factors, most notably RelA, in the regions becoming more accessible, with analysis of ChIP-seq data confirmed RelA binding to these regions. A significant correlation in differential chromatin accessibility and gene expression was also observed. Functionality in regulating gene expression was confirmed using CRISPR/Cas9 genome-editing to delete regions that became more accessible following stimulation in the genes MMP13, IKBKE and C1QTNF1. These same regions were also accessible for activation using a dCas9-transcriptional activator and showed enhancer activity in a cellular model. Together, these data describe and functionally validate a number of dynamically accessible chromatin regions involved in inflammatory signalling.

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Interleukin-18 induced chromatin accessibility coupled to proteomic analysis by mass cytometry and ion beam imaging

Project description:Regulated chromatin states control genome accessibility and thus influence gene expression. Here we report an analysis pipeline termed ATAC-mass that capitalizes on isotopic labeling to detect the accessible genome by multiplexed ion beam imaging (MIBI) and mass cytometry. With MIBI the accessible genome can be visualized at approximately 100-nm resolution simultaneously with metabolic labeling to enable multi-parameter three-dimensional imaging of nuclear features. Extension of this approach to non-spatial mass cytometry enabled the simultaneous measurement of multiple parameters and total genome accessibility in millions of individual cells. We used ATAC-mass to analyze natural killer cells after stimulation with interleukin (IL)-12 or IL-18 -- demonstrating that IL-18 treatment leads to increased total genome accessibility. Analysis of the spatial organization of open chromatin suggest that IL-12 and IL-18 both induce an increase in chromatin accessibility in noncompacted DNA regions. Deep sequencing of the genomic distribution of open chromatin revealed that IL-18 increased the accessibility of quiescent enhancers whereas genomic loci that become more accessible by IL-12 stimulation are mainly localized in the active promoter regions. This integration of epigenomics, proteomics and high-resolution imaging at the single-cell level provides a tool that can enhance our appreciation of the molecular mechanisms underlying gene regulation.

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