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MicroRNAs reinforce repression of PRC2 transcriptional targets independently and through a feed-forward regulatory network with PRC2 [iCLIP]

ABSTRACT: We performed iCLIP for AGO2 to identify AGO2-interacting mRNAs in T98G glioblastoma multiforme cells.

ORGANISM(S): Homo sapiens

PROVIDER: GSE112651 | GEO | 2019/01/09

REPOSITORIES: GEO

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MicroRNAs reinforce repression of PRC2 transcriptional targets independently and through a feed-forward regulatory network with PRC2 [ChIP-seq]

Project description:We performed ChIP-seq for EZH2 and its associated histone mark, H3K27me3, in T98G Glioblastoma multiforme cells.

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MicroRNAs reinforce repression of PRC2 transcriptional targets independently and through a feed-forward regulatory network with PRC2 [RNA-seq]

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MicroRNAs reinforce repression of PRC2 transcriptional targets independently and through a feed-forward regulatory network.

Project description:Gene expression can be regulated at multiple levels, but it is not known if and how there is broad coordination between regulation at the transcriptional and post-transcriptional levels. Transcription factors and chromatin regulate gene expression transcriptionally, whereas microRNAs (miRNAs) are small regulatory RNAs that function post-transcriptionally. Systematically identifying the post-transcriptional targets of miRNAs and the mechanism of transcriptional regulation of the same targets can shed light on regulatory networks connecting transcriptional and post-transcriptional control. We used individual-nucleotide resolution UV crosslinking and immunoprecipitation (iCLIP) for the RNA-induced silencing complex (RISC) component AGO2 and global miRNA depletion to identify genes directly targeted by miRNAs. We found that Polycomb repressive complex 2 (PRC2) and its associated histone mark, H3K27me3, is enriched at hundreds of miRNA-repressed genes. We show that these genes are directly repressed by PRC2 and constitute a significant proportion of direct PRC2 targets. For just over half of the genes corepressed by PRC2 and miRNAs, PRC2 promotes their miRNA-mediated repression by increasing expression of the miRNAs that are likely to target them. miRNAs also repress the remainder of the PRC2 target genes, but independently of PRC2. Thus, miRNAs post-transcriptionally reinforce silencing of PRC2-repressed genes that are inefficiently repressed at the level of chromatin, by either forming a feed-forward regulatory network with PRC2 or repressing them independently of PRC2.

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MicroRNAs reinforce repression of PRC2 transcriptional targets independently and through a feed-forward regulatory network with PRC2 [iCLIP]

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MicroRNAs reinforce repression of PRC2 transcriptional targets independently and through a feed-forward regulatory network

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