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Role of the Small Subunit Processome in the Maintenance of Pluripotent Stem Cells

ABSTRACT: RNA-binding proteins (RBPs) play integral roles in gene regulation, yet only a small fraction of RBPs has been studied in the context of stem cells. We here apply RNA interference screen for RBPs in mouse embryonic stem cells (ESCs) and identify 16 RBPs involved in pluripotency maintenance. Interestingly, six identified RBPs including Krr1 and Ddx47 are part of a complex called Small Subunit Processome (SSUP) that mediates 18S rRNA biogenesis. The SSUP components are preferentially expressed in stem cells and enhance global translational rate, which is critical to sustain the protein levels of labile pluripotency factors such as Nanog and Esrrb. Furthermore, the SSUP proteins are required for efficient reprogramming of induced pluripotent stem cells. Our study uncovers the role of SSUP and the importance of translational control in stem cell fate decision.

ORGANISM(S): Mus musculus

PROVIDER: GSE73369 | GEO | 2015/09/24

SECONDARY ACCESSION(S): PRJNA296812

REPOSITORIES: GEO

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Role of the Small Subunit Processome in the Maintenance of Pluripotent Stem Cells

Project description:RNA-binding proteins (RBPs) play integral roles in gene regulation, yet only a small fraction of RBPs has been studied in the context of stem cells. We here apply RNA interference screen for RBPs in mouse embryonic stem cells (ESCs) and identify 16 RBPs involved in pluripotency maintenance. Interestingly, six identified RBPs including Krr1 and Ddx47 are part of a complex called Small Subunit Processome (SSUP) that mediates 18S rRNA biogenesis. The SSUP components are preferentially expressed in stem cells and enhance global translational rate, which is critical to sustain the protein levels of labile pluripotency factors such as Nanog and Esrrb. Furthermore, the SSUP proteins are required for efficient reprogramming of induced pluripotent stem cells. Our study uncovers the role of SSUP and the importance of translational control in stem cell fate decision. R1 cells were transfected with 3 different control siRNAs and 3 different siRNAs targeting Krr1 for 48 hrs. Transcriptome profiles were generated by deep sequencing using illumina HiSeq 2000.

2015-09-24 | E-GEOD-73369 | biostudies-arrayexpress

ESRRB Facilitates the Conversion of Trophoblast-like Stem Cells from Induced Pluripotent Stem cells by Directly Regulating KRT8 and CDX2

Project description:Porcine induced pluripotent stem cells (piPSCs) could serve as a great model system for human stem cell pre-clinical research. However, the pluripotency gene network of piPSCs, especially the function for the core transcription factor ESRRB, was poorly understood. Here, we constructed ESRRB-overexpressing piPSCs (ESRRB-piPSCs). Compared with the control piPSCs (CON-piPSCs), the ESRRB-piPSCs showed flat, monolayered colony morphology. Moreover, the ESRRB-piPSCs showed greater chimeric capacity into trophectoderm than CON-piPSCs. We found that ESRRB could directly regulate the expressions of trophoblast stem cell (TSC)-specific markers, including KRT8, KRT18 and CDX2, through binding to their promoter regions. Mutational analysis proved that the N-terminus zinc finger domain is indispensable for ESRRB to regulate the TSC markers. Furthermore, this regulation needs the participation of OCT4. Accordingly, the cooperation between ESRRB and OCT4 facilitates the conversion from pluripotent state to the trophoblast-like state.

2022-02-17 | PXD027539 | Pride

Fgf and Esrrb integrate epigenetic and transcriptional networks that regulate self-renewal of Trophoblast Stem Cells

Project description:Esrrb is a transcription factor implicated in embryonic stem (ES) cell self-renewal, yet its knockout causes intrauterine lethality due to defects in trophoblast development. Here we show that in trophoblast stem (TS) cells, Esrrb is a downstream target of fibroblast growth factor (Fgf) signalling and is critical to drive TS cell self-renewal. In contrast to its occupancy of pluripotency-associated loci in ES cells, Esrrb sustains the stemness of TS cells by direct binding and regulation of TS cell-specific transcription factors including Elf5 and Eomes. To elucidate the mechanisms whereby Esrrb controls the expression of its targets, we characterized its TS cell-specific interactome by mass spectrometry. Unlike in ES cells, Esrrb interacts in TS cells with the histone demethylase Lsd1 and with the RNA Polymerase II-associated Integrator complex. Our findings provide new insights into both, the general and context-dependent wiring of transcription factor networks in stem cells by master transcription factors.

2015-07-24 | PXD002183 | Pride

Next generation unnatural monosaccharides reveal that ESRRBO GlcNAcylation enhances pluripotency of mouse embryonic stem cells

Project description:Unnatural monosaccharides such as azidosugars that can be metabolically incorporated into cellular glycans are currently used as a major tool for glycan imaging and glycoproteomic profiling. As a common practice to enhance membrane permeability and cellular uptake, the unnatural sugars are per O acetylated, which, however, can induce a long-overlooked side reaction, non enzymatic S-glycosylation. Herein, we develop1,3 di esterified N azidoacetylgalactosamine (GalNAz) as the next generation chemical reporters for metabolic glycan labeling. Both 1,3 di O-acetylated GalNAz (1,3-Ac2GalNAz) and1,3 di O propionylated GalNAz (1,3-Pr2GalNAz)exhibited high efficiency for labeling protein O-GlcNAcylation with no artificial S-glycosylation. Applying1,3 Pr2GalNAz in mouse embryonic stem cells (mESCs), we identified ESRRB, a critical transcription factor for pluripotency, as an O-GlcNAcylated protein. We showed that ESRRB O-GlcNAcylation is important for mESC self-renewal and pluripotency. Mechanistically, ESRRB is O-GlcNAcylated by O-GlcNAc transferase (OGT) at serine 25 (Ser 25), which stabilizes ESRRB, promotes its transcription activity and facilitates its interactions with two master pluripotency regulators, OCT4 and NANOG.

2019-09-12 | PXD014785 | Pride

Next generation unnatural monosaccharides reveal that ESRRBO GlcNAcylation enhances pluripotency of mouse embryonic stem cells

2019-09-09 | PXD015035 | Pride

A Bipartate function of ESRRB integrates signaling over time to balance self-renewal and differentiation [scRNA-Seq]

Project description:Cooperative DNA binding of transcription factors (TFs) integrates external stimuli and context across tissues and time. Naïve mouse embryonic stem cells (ESCs) are derived from early development and can sustain early embryonic pluripotent identity indefinitely. Here we ask whether TFs associated with pluripotency evolved to directly support this state or if it emerges from their combinatorial action? NANOG and ESRRB are key pluripotency factors that co-bind DNA. We find that when both factors are expressed at physiological levels, ESRRB supports pluripotency. However, when NANOG is not present, ESRRB supports a bistable culture of embryo-like primitive endoderm identity ancillary to pluripotency. The stochiometry between these factors quantitatively influences differentiation and in silico modelling of bipartite TF activity suggests ESRRB safeguards plasticity in differentiation. Thus the concerted activity of cooperative TFs transforms their effect to sustain intermediate cell identities that can be expanded ex vivo as highly stable stem cell models.

2023-04-18 | GSE207564 | GEO

A Bipartate function of ESRRB integrates signaling over time to balance self-renewal and differentiation [ATAC-Seq]

2023-04-18 | GSE207563 | GEO

A Bipartate function of ESRRB integrates signaling over time to balance self-renewal and differentiation [ChIP-Seq]

2023-04-18 | GSE207562 | GEO

A Bipartate function of ESRRB integrates signaling over time to balance self-renewal and differentiation [RNA-Seq]

2023-04-18 | GSE207560 | GEO

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".

2023-05-05 | PXD025284 | Pride

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