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Serine arginine-rich splicing factor (SRSF7) cooperates with the histone methyltransferase KMT5a to promote the type I interferon response via transcriptional activation of IRF7

ABSTRACT: Serine arginine-rich splicing factor (SRSF7) cooperates with the histone methyltransferase KMT5a to promote the type I interferon response via transcriptional activation of IRF7

PROVIDER: PRJNA1001049 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25485646_1.fastq.gz	Fastqsanger.gz
	SRR25485646_2.fastq.gz	Fastqsanger.gz
	SRR25485647_1.fastq.gz	Fastqsanger.gz
	SRR25485647_2.fastq.gz	Fastqsanger.gz
	SRR25485648_1.fastq.gz	Fastqsanger.gz

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Serine arginine-rich splicing factor (SRSF7) cooperates with the histone methyltransferase KMT5a to promote the type I interferon response via transcriptional activation of IRF7

Project description:Tight regulation of macrophage immune gene expression is required to fight infection without risking harmful inflammation. The contribution of RNA binding proteins (RBPs) to shaping the macrophage response to pathogens remains poorly understood. Transcriptomic analysis revealed that a member of the serine/arginine-rich (SR) family of mRNA processing factors, SRSF7, is required for optimal expression of a cohort of interferon stimulated genes (ISGs) in macrophages. Using genetic and biochemical assays, we discovered that in addition to its canonical role in regulating alternative splicing, SRSF7 drives transcription of interferon regulatory transcription factor 7 (IRF7) to promote antiviral immunity. At the Irf7 promoter, SRSF7 maximizes STAT1 transcription factor binding and RNA polymerase II elongation via cooperation with the H4K20me1 histone methyltransferase KMT5a (SET8). These studies define an unorthodox role for an SR protein in activating transcription and reveal an unappreciated RNA binding protein-chromatin network that orchestrates macrophage antiviral gene expression.

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Serine/arginine-rich splicing factor 7 (SRSF7) promotes the type I interferon response by activating Irf7 transcription

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Serine/arginine-rich splicing factor 7 (SRSF7) promotes the type I interferon response by activating Irf7 transcription

Project description:Serine/arginine-rich splicing factor 7 (SRSF7) promotes the type I interferon response by activating Irf7 transcription

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PHGDH Arginine Methylation by PRMT1 Promotes Serine Synthesis and Represents a Therapeutic Vulnerability in Hepatocellular Carcinoma

Project description:Serine synthesis is crucial for tumor growth and survival, but its regulatory mechanism in cancer remains elusive. Here, using integrative metabolomics and transcriptomics analyses, we show a heterogeneity between metabolite and transcript profiles. Specifically, the level of serine in HCC tissues is increased, whereas the expression of phosphoglycerate dehydrogenase (PHGDH), the first rate-limiting enzyme in serine biosynthesis pathway, is dramatically downregulated. Interestingly, the increased serine level is obtained by enhanced PHGDH catalytic activity due to protein arginine methyltransferase 1 (PRMT1)-mediated methylation of PHGDH at arginine 236. PRMT1-mediated PHGDH methylation and activation potentiates serine synthesis, ameliorates oxidative stress, and promotes HCC growth in vitro and in vivo. FBXO7, an E3 ubiquitin ligase which is downregulated in human HCC tissues, ubiquitinates and downregulates PRMT1 to suppress PHGDH methylation and serine synthesis, leading to the inhibition of HCC cell growth. Furthermore, PRMT1-mediated PHGDH methylation correlates with PHGDH hyperactivation and serine accumulation in human HCC tissues, and is predictive of poor prognosis of HCC patients. Notably, blocking PHGDH methylation with a TAT-tagged non-methylated peptide inhibits serine synthesis and restrains HCC growth, both in an HCC patient-derived xenograft (PDX) model and subcutaneous HCC cell-derived xenograft model. Overall, our findings reveal a novel regulatory mechanism of PHGDH activity and serine synthesis, and suggest PHGDH methylation as a potential therapeutic vulnerability in HCC.

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RIP-seq of SRSF7 in Huh7

Project description:RNA seq was performed after IP of Ab-SRSF7 in Huh7 cells.

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ChIP-seq for IRF7

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Transcriptome-wide mapping of RNA:protein interactions of SRSF7 variants in P19 cells by iCLIP and piCLIP

Project description:We used P19 cells that overexpress GFP-tagged SRSF7 by 3.4-fold and expression-matched SRSF7 mutants that either lack a functional Zinc-knuckle domain or a part of their RS-domain and compared the extent and pattern of binding to mRNAs. For this we performed iCLIP using anti-GFP antibodies. We also performed iCLIP from monosomal and polysomal fractions. In addition we performed iCLIP using anti-SRSF7 antibodies to compare the binding patterns of SRSF7-GFP, endogenous SRSF7 protein and its truncated SRSF7_RRM variant.

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PAR-CLIP analysis of YTHDC1, SRSF1, SRSF3, SRSF7, SRSF9 and SRSF10 in human HeLa cells

Project description:Label the cells overexpressed Flag tagged YTHDC1, SRSF1, SRSF3, SRSF7, SRSF9 and SRSF10 with 4-SU, the RNA bound by YTHDC1 and SRSF proteins can be got by Flag IP followed by RNA isolation by using the TRIzol (Invitrogen) reagent by following the company manual.the RNA was then used for library preparation using a TruSeqâ¢ RNA Sample Prep Kit v2 (Illumina, San Diego, CA, USA) according to the manufacturerâs protocol.The libraries were sequenced using HiSeq2000 (Illumina) in single-read mode, creating reads with a length of 101 bp. Sequencing chemistry v2 (Illumina) was used and samples were multiplexed in two samples per lane. Discovery of the binding motif of YTHDC1, SRSF1, SRSF3, SRSF7, SRSF9 or SRSF10 in overexpressed Human HeLa cells

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ChIP-seq for IRF7

Project description:We performed ChiP-Seq for IRF7 in GM-CSF induced bone-marrow cells.

2014-12-03 | GSE62697 | GEO