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SeCLIP-Seq (single-end enhanced crosslinking and immunoprecipitation) of STAT3, OCT4, and SRSF1 in human embryonic stem cells (hESCs)

ABSTRACT: seCLIP-Seq (single-end enhanced crosslinking and immunoprecipitation) of STAT3, OCT4, and SRSF1 in TE03 (I3) human embryonic stem cells (hESCs)

PROVIDER: PRJEB44137 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR5665030.fastq.gz	Fastqsanger.gz
	ERR5665040.fastq.gz	Fastqsanger.gz
	ERR5665050.fastq.gz	Fastqsanger.gz
	ERR5665060.fastq.gz	Fastqsanger.gz
	ERR5665031.fastq.gz	Fastqsanger.gz

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Analysis of nucleus and cytoplasm-specific HNRNPK binding on SINEUP RNA by seCLIP

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Time-course proteomic analysis of spontaneously differentiating human embryonic stem cells (hESCs)

Project description:Mass spectrometry analysis was carried out to investigate the protein expression landscape of RNA-binding proteins (RBPs) during a time-course of spontaneously differentiating human embryonic stem cells (hESCs). Mass spectrometry was performed on whole-cell extracts of differentiating TE03 (I3) hESCs at four time-points (days 0, 23, 39, and 54), each with two biological replicates.

2023-05-05 | PXD025274 | Pride

Mass spectrometry based-proteomic analysis comparing the abundance of RNA-binding proteins (RBPs) between TE03 (I3) human embryonic stem cells (hESCs) and human foreskin fibroblasts (HFFs)

Project description:Here, we used high-resolution mass spectrometry to identify differentially expressed RNA-binding proteins (RBPs) between TE03 (I3) human embryonic stem cells (hESCs) and human foreskin fibroblasts (HFFs). 2102Ep embryonal carcinoma (EC) cells were used as a reference for pluripotent cells. This data accompanies the manuscript: "Uncovering the RNA-binding protein landscape in the pluripotency network of human embryonic stem cells". Abstract: "Embryonic stem cell (ESC) self-renewal and cell-fate decisions are driven by a broad array of molecular signals. While transcriptional regulators have been extensively studied in human ESCs (hESCs), the extent to which RNA-binding proteins (RBPs) contribute to human pluripotency remains unclear. Here, we carry out a proteome-wide screen and identify 810 proteins that directly bind RNA in hESCs. We reveal that RBPs are preferentially expressed in hESCs and dynamically regulated during exit from pluripotency and early lineage specification. Moreover, we show that nearly 200 RBPs are affected by knockdown of OCT4, a master regulator of pluripotency, several dozen of which are directly bound by this factor. Intriguingly, over 20 percent of the proteins detected in our study are putative DNA- and RNA-binding proteins (DRBPs), among them key transcription factors (TFs). Using fluorescently labeled RNA and seCLIP (single-end enhanced crosslinking and immunoprecipitation) experiments, we discover that the pluripotency-associated STAT3 and OCT4 TFs interact with RNA in hESCs and confirm the direct binding of STAT3 to the conserved NORAD long-noncoding RNA. Taken together, our findings indicate that RBPs have a more widespread role in human pluripotency than previously appreciated, reinforcing the importance of post-transcriptional regulation in stem cell biology".

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Splicing factor SRSF1 promotes breast cancer progression via regulating alternative splicing

Project description:Purpose:Intensive evidence have highlighted the effect of aberrant alternative splicing (AS) events triggered by dysregulation of SR protein family on cancer progression. Nonetheless, the underlying mechanism in breast cancer (BRCA) remains elusive. Here we sought to explore the molecular function of SRSF1 and identify the key AS events regulated by SRSF1 in BRCA. Methods:We conducted comprehensive analysis for the expression and the clinical correlation of SRSF1 in BRCA based on TCGA, Metabric database, clinical tissue samples and BRCA cell lines. Functional analysis of SRSF1 in BRCA was conducted in vitro and in vivo. SRSF1-mediated AS events and its binding motif were identified by RNA-seq, RNA immunoprecipitation-PCR (RIP-PCR) and in vivo crosslinking followed by immunoprecipitation (CLIP), which was further validated by the minigene reporter assay. Finally, the expression and their clinical significance were validated in clinical samples and TCGA database. Results:SRSF1 was upregulated in BRCA samples, associated positively with tumor grade and Ki-67 index, and correlated with poor prognosis in hormone receptor positive (HR+) cohort, which facilitated tumor progression in vitro and in vivo. We identified SRSF1-mediated AS events and discovered the SRSF1 binding motif in the regulation of PTPMT1. Furthermore, PTPMT1 splice switching regulated by SRSF1 partially mediated the oncogenic role of SRSF1 via the AKT/C-MYC axis. Additionally, PTPMT1 splice switching was validated in tissue samples of BRCA patients. Conclusions:Collectively, SRSF1 exerts the oncogenic roles in BRCA partially through regulating AS of PTPMT1, which could be a candidate prognostic factor and therapeutic target in HR+ BRCA cohort.

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