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Systematic identification of RNA-binding proteins and tethered domains that activate exon splicing inclusion

ABSTRACT: Systematic identification of RNA-binding proteins and tethered domains that activate exon splicing inclusion

PROVIDER: PRJNA972974 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR24579600_1.fastq.gz	Fastqsanger.gz
	SRR24579600_2.fastq.gz	Fastqsanger.gz
	SRR24579601_1.fastq.gz	Fastqsanger.gz
	SRR24579601_2.fastq.gz	Fastqsanger.gz
	SRR24579602_1.fastq.gz	Fastqsanger.gz

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Systematic identification of RNA-binding proteins and tethered domains that activate exon splicing inclusion [RNA-seq]

Project description:RNA-binding proteins (RBPs) modulate alternative splicing outcomes to determine isoform expression and cellular survival. To identify RBPs that directly drive alternative exon inclusion, we evaluated 718 human RBPs with tethered function luciferase-based splicing reporter assays to identify 58 candidates, including known splicing factors such as RBFOX and serine-arginine proteins. We performed enhanced CLIP, RNA-seq, and affinity purification-mass spectrometry to investigate a subset of the 11 candidates with no prior association with splicing. Integrative analysis of these assays indicated the surprising roles of TRNAU1AP, SCAF8, and RTCA in modulating hundreds of endogenous splicing events. We also leveraged our tethering assays and top candidates to identify potent and compact exon inclusion activation domains for splicing modulation applications. Using identified domains, we engineered programmable fusion proteins which outperformed current artificial splicing factors at manipulating inclusion of reporter and endogenous exons. Altogether, our tethering approach characterized the ability of RBPs to induce exon inclusion and yielded new molecular parts for programmable splicing control.

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Project description:This SuperSeries is composed of the SubSeries listed below.

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Targeting PRMT1-mediated SRSF1 Methylation to Suppress Exon Inclusion within Oncogenic Transcripts and Breast Tumorigenesis

Project description:PRMT1 is highly expressed in breast tumors, and has been suggested to play a vital role in breast tumorigenesis, but the underlying molecular mechanisms remain to be fully characterized. Here, we reveal that PRMT1 exhibits a wide-spreading role in RNA alternative splicing based on transcriptome analysis, with a preference for exon inclusion in a large cohort of oncogenic genes. Profiling PRMT1 methylome reveals that the arginine/serine-rich splicing factor SRSF1 is heavily arginine-methylated by PRMT1, which is critical for SRSF1 phosphorylation, SRSF1 binding with RNA, and PRMT1-induced exon inclusion. In breast tumors, the overexpression of PRMT1 is associated with high levels of SRSF1 arginine methylation and aberrant exon inclusion in those oncogenic genes. Accordingly, PRMT1-mediated SRSF1 methylation and exon inclusion events are found to be critical for the malignant behaviors of breast cancer cells. Furthermore, we identified and characterized a selective PRMT1 inhibitor iPRMT1, which is potent in inhibiting PRMT1-mediated SRSF1 methylation and exon inclusion events, and breast cancer cell growth both in vitro and in vivo. Combination treatment with iPRMT1 and inhibitor targeting SRSF1 phosphorylation, SPHINX31 or SRPIN340, exhibits synergistic effects on suppressing breast cancer cell growth, strengthening the cross-talk between arginine methylation and phosphorylation in SRSF1. In conclusion, our data uncover a key mechanism underlying PRMT1-mediated gene alternative splicing, demonstrating targeting PRMT1 has great potential to treat breast cancer in clinic.

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