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Epigenetic dependencies of interferon gamma-induced gene expression [RNA-Seq]

ABSTRACT: Epigenetic dependencies of interferon gamma-induced gene expression [RNA-Seq]

PROVIDER: PRJNA833411 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR18971138.fastq.gz	Fastqsanger.gz
	SRR18971139.fastq.gz	Fastqsanger.gz
	SRR18971140.fastq.gz	Fastqsanger.gz
	SRR18971141.fastq.gz	Fastqsanger.gz
	SRR18971142.fastq.gz	Fastqsanger.gz

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Epigenetic dependencies of interferon gamma-induced gene expression

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Project description:Interferon gamma (IFNy) is a pro-inflammatory cytokine that directly activates the JAK/STAT pathway. However, the temporal dynamics of chromatin remodeling and transcriptional activation initiated by IFN have not been systematically profiled in an unbiased manner. Herein, we integrated transcriptomic and epigenomic profiling to characterize the acute epigenetic changes induced by IFNy stimulation in a murine breast cancer model. We identified de novo activation of cis-regulatory elements bound by Irf1 that were characterized by increased chromatin accessibility, differential usage of pro-inflammatory enhancers, and downstream recruitment of BET proteins and RNA polymerase II. To functionally validate this hierarchical model of IFNy-driven transcription, we applied selective antagonists of histone acetyltransferases P300/CBP or acetyl-lysine readers of the BET family. This highlighted that histone acetylation is an antecedent event in IFNy-driven transcription, whereby targeting of P300/CBP but not BET inhibition, could curtail the epigenetic remodeling induced by IFNy through suppression of Irf1 transactivation. These data highlight the utility for epigenetic therapies to reprogram pro-inflammatory gene expression, which may have therapeutic implications for anti-tumor immunity and inflammatory diseases.

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Project description:Interferon gamma (IFNy) is a pro-inflammatory cytokine that directly activates the JAK/STAT pathway. However, the temporal dynamics of chromatin remodeling and transcriptional activation initiated by IFNy have not been systematically profiled in an unbiased manner. Herein, we integrated transcriptomic and epigenomic profiling to characterize the acute epigenetic changes induced by IFNy stimulation in a murine breast cancer model. We identified de novo activation of cis-regulatory elements bound by Irf1 that were characterized by increased chromatin accessibility, differential usage of pro-inflammatory enhancers, and downstream recruitment of BET proteins and RNA polymerase II. To functionally validate this hierarchical model of IFNy-driven transcription, we applied selective antagonists of histone acetyltransferases P300/CBP or acetyl-lysine readers of the BET family. This highlighted that histone acetylation is an antecedent event in IFNy-driven transcription, whereby targeting of P300/CBP but not BET inhibition, could curtail the epigenetic remodeling induced by IFNy through suppression of Irf1 transactivation. These data highlight the utility for epigenetic therapies to reprogram pro-inflammatory gene expression, which may have therapeutic implications for anti-tumor immunity and inflammatory diseases.

2022-07-24 | GSE201882 | GEO

Epigenetic dependencies of interferon gamma-induced gene expression [ATAC-Seq]

Project description:Interferon gamma (IFNy) is a pro-inflammatory cytokine that directly activates the JAK/STAT pathway. However, the temporal dynamics of chromatin remodeling and transcriptional activation initiated by IFNy have not been systematically profiled in an unbiased manner. Herein, we integrated transcriptomic and epigenomic profiling to characterize the acute epigenetic changes induced by IFNy stimulation in a murine breast cancer model. We identified de novo activation of cis-regulatory elements bound by Irf1 that were characterized by increased chromatin accessibility, differential usage of pro-inflammatory enhancers, and downstream recruitment of BET proteins and RNA polymerase II. To functionally validate this hierarchical model of IFNy-driven transcription, we applied selective antagonists of histone acetyltransferases P300/CBP or acetyl-lysine readers of the BET family. This highlighted that histone acetylation is an antecedent event in IFNy-driven transcription, whereby targeting of P300/CBP but not BET inhibition, could curtail the epigenetic remodeling induced by IFNy through suppression of Irf1 transactivation. These data highlight the utility for epigenetic therapies to reprogram pro-inflammatory gene expression, which may have therapeutic implications for anti-tumor immunity and inflammatory diseases.

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Project description:Human fibroblasts were infected or not with Toxoplasma gondii (Pru strain) for 18 h at a nominal MOI of 3. Cells were subsequently treated with human recombinant interferon gamma (0.5 ng/ml = 30 pM) for 0, 2, 4 and 8 h before RNA was harvested for cDNA microarray experiments. Uninfected samples were named N0, N2, N4 and N8 (i.e., N2 indicated uninfected cells treated with interferon gamma for 2 h); infected samples were named P0, P2, P4 and P8. Duplicate cultures were analyzed for each condition (indicated as "a" and "b"). The reference channel (ch1, green) contained Universal Human Reference RNA. Using a genome-wide microarray analysis we show here a complete dysregulation of interferon-gamma-inducible gene expression in human fibroblasts infected with Toxoplasma. Notably, 46 of the 127 interferon-gamma-responsive genes were induced and 19 were suppressed in infected cells before they were exposed to interferon gamma, indicating that other stimuli produced during infection may also regulate these genes. Following interferon-gamma treatment, none of the 127 interferon-gamma-responsive genes could be significantly induced in infected cells.

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