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Genome-wide analysis revealed a crosstalk between p53 and the pluripotent gene networks in mouse embryonic stem cells (ChIP-Seq)

ABSTRACT: Study of the function of p53 in regulating gene expression in mouse embryonic stem cells. It is critical for embryonic stem cells to maintain their genomic stability. The guardian of the genome, p53, plays important roles in maintaining the genomic integrity of ES cells through regulating the differentiation of ES cells. However, the underlying mechanism of this differentiation is still unclear. We plan to use the integrative genome-wide approach, combining ChIP-seq and gene expression microarray, to explore the mechanisms.

ORGANISM(S): Mus musculus

PROVIDER: GSE26361 | GEO | 2012/03/05

SECONDARY ACCESSION(S): PRJNA142241

REPOSITORIES: GEO

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Genome-wide analysis revealed a crosstalk between p53 and the pluripotent gene networks in mouse embryonic stem cells (ChIP-Seq)

Project description:Study of the function of p53 in regulating gene expression in mouse embryonic stem cells. It is critical for embryonic stem cells to maintain their genomic stability. The guardian of the genome, p53, plays important roles in maintaining the genomic integrity of ES cells through regulating the differentiation of ES cells. However, the underlying mechanism of this differentiation is still unclear. We plan to use the integrative genome-wide approach, combining ChIP-seq and gene expression microarray, to explore the mechanisms. Total six samples: two inputs (untreated and treated with adriamycin) and four ChIP samples (p53_untreated, p53_adr8h, p53S18P_untreated, p53S18P_adr8h). The two inputs will serve as controls for identifying the binding sites.

2012-03-05 | E-GEOD-26361 | biostudies-arrayexpress

Genome-wide analysis revealed a crosstalk between p53 and the pluripotent gene networks in mouse embryonic stem cells (expression)

Project description:The tumor suppressor p53 regulates the differentiation of embryonic stem (ES) cells upon DNA damage. However, our understanding of this critical tumor suppressive role of p53 in ES cells is limited, mainly because of the lack of molecular mechanism. Here, we report a widespread cross-regulation of p53-mediated DNA damage signaling and the pluripotent gene network in ES cells using chromatin-immunoprecipitation assay-based sequencing (ChIP-seq) and gene expression microarray. Upon DNA damage, p53 directly regulates the transcription of 3644 genes (p<0.005) in mouse ES cells. Genome-wide analysis revealed a dramatic difference between the regulation of p53-activated and -repressed genes. p53 mainly regulates the promoter regions of activated genes, whereas the main regulatory regions for repressed genes reside in distal regions. Among p53-repressed genes, many are pluripotent transcription factors of ES cells, such as Oct4, Nanog, Sox2, Esrrb, c-Myc, n-Myc and Sall4. Strikingly, these transcriptional factors also directly regulate the transcription of the Trp53 gene, highlighting a previously under-estimated transcriptional regulation of p53 in ES cells. Therefore, p53 signaling and ES pluripotent transcriptional networks form an intertwined circuitry. Together, our results provide mechanistic insights into the crosstalk of p53-mediated DNA damage and ES cell "stemness" transcriptional gene networks and shed light on the tumor suppressive function of p53 in ES cells.

2012-03-05 | GSE26360 | GEO

Genome-wide analysis revealed a crosstalk between p53 and the pluripotent gene networks in mouse embryonic stem cells (expression)

2012-03-05 | E-GEOD-26360 | biostudies-arrayexpress

ChIP-chip on custom NimbleGen genomic tiling arrays

Project description:Performing Chromatin IP of Klf2, Klf4, Klf5 and p53 in mouse embryonic stem cells with NimbleGen custom genomic tiling arrays, we sought to decipher Klf2, Klf4, Klf5-regulated genes. Keywords: genomic tiling arrays, ES cells

2008-02-11 | GSE9774 | GEO

p53 coordinates Wnt and TGF-β inputs on mesendoderm differentiation genes

Project description:The TGF-β superfamily member Nodal triggers mesendoderm differentiation in embryonic stem (ES) cells. This transition however requires cooperating Wnt signaling inputs. Here we report that p53, a powerful tumor suppressor in adult tissues, orchestrates this cooperation. We show that p53, which is released from inhibition as mouse ES cells exit from pluripotency, acts as a direct inducer of Wnt3 expression. Wnt-activated Tcf3 then converges with Nodal-activated Smad transcriptional complexes on mesendoderm specification super-enhancers. p53 and its homolog p73 act redundantly in Wnt induction. When p53 and p73 are depleted, the ES cells fail to secrete autocrine Wnt ligands, Tcf and Nodal-activated Smads fail to bind to mesendoderm gene enhancers, and the cells adopt ectoderm rather than mesendoderm identity. Enforced Wnt3 expression or addition of Wnt3a rescues mesendoderm differentiation in p53/p73-depleted ES cells. Thus, independently of their established role as tumor suppressors that guard genome integrity in mature cells, p53 and p73 serve a primordial role in ES cell differentiation by driving a cooperation of Wnt and TGF-β transcriptional inputs on mesendoderm identity gene enhancers.

2017-01-06 | GSE70486 | GEO

The subcellular proteome of mouse pluripotent embryonic stem cells

Project description:Our understanding of the biology of embryonic stem (ES) cells is deeply rooted in characterization of their transcriptomes, epigenetics and underlying gene regulatory networks. There is evidence that post-transcriptional processes such as signaling, adhesion, protein turnover and post translational modifications make a significant contribution to regulating the balance between self-renewal and differentiation, and it is therefore necessary to also characterize ES cells at the protein level. In this experiment, we used a workflow termed hyperLOPIT (hyperplexed localization of organelle proteins by isotope tagging) to characterize the subcellular distribution of proteins in a population of self-renewing E14TG2a mouse ES cells. Over 5,000 protein groups were quantified in both of the two replicates, enabling characterization of protein localization to organelles (including sub-nuclear resolution), cell surface, cytoskeleton and cytosol. The steady-state localization of transitory proteins, protein complex constituents, and signaling cascades could also be mapped.

2016-01-14 | PXD001279 | Pride

p53 is essential for DNA methylation homeostasis in naïve embryonic stem cells, and its loss promotes clonal heterogeneity

Project description:Development of a zygote into a multicellular organism involves many tightly regulated cellular processes, including the epigenetic landscaping of chromatin. When embryonic stem cells (ESCs) are induced to undergo differentiation, the transcriptional network ensuring pluripotency is silenced partly by de novo 5mC DNA methylation. Oxidation of 5mC to hydroxymethylcytosine (5hmC) by the TET enzymes adds another layer of regulation to DNA methylation in ESCs. The increase in 5mC methylation along with a decrease in 5hmC methylation is essential for the cellular commitment towards lineage specification. Recently, crosstalk between the p53 tumor suppressor and DNA methylation was demonstrated, earning p53 the title ‘guardian of the epigenome’. However, the involvement of p53 in regulation of DNA methylation throughout development remained unclear. Here we show that p53 regulates the expression of DNA methyltransferases (DNMTs), which set and maintain 5mC methylation, as well as of TETs, which catalyze 5hmC. In the absence of p53, basal 5mC levels are markedly augmented while hydroxymethylation is compromised. p53 and TETs co-localize on putative enhancers and appear to maintain them unmethylated. Furthermore, p53-/- ESCs acquire an aberrant DNA methylation pattern upon induced differentiation. Importantly, this aberrant pattern is carried over into adult liver. Our results imply that p53 dysfunction may lead to abnormal methylation setting in both ESCs and adult tissue. Thus, loss of p53 function may facilitate cancer development not only by permitting genomic instability but also by enabling epigenetic promiscuity.

2017-07-18 | GSE60209 | GEO

SIN3A Acetylation Complex - Fam60a defines a variant Sin3a-Hdac complex in embryonic stem cells required for self-renewal

Project description:Sin3a is the central scaffold protein of the prototypical Hdac1/2 chromatin repressor complex, crucially required during early embryonic development for the growth of pluripotent cells of the inner cell mass. Here, we explore the endogenous composition of the Sin3a-Hdac complex in pluripotent embryonic stem (ES) and differentiated cells. To do this, we established an endogenous double immunoprecipitation strategy coupled with quantitative mass spectrometry (ENDIP-MS) allowing us to define the precise composition of the Sin3a complex in multiple cell types. We identify the Fam60a subunit as a key defining feature of a variant Sin3a complex present in ES cells, but not in differentiated cells. Fam60a co-occupies H3K4me3 positive promoters with Sin3a and is essential to maintain it on chromatin. Consistent with this, Fam60a depletion phenocopies the loss of Sin3a, leading to decreased proliferation, an extended G1-phase and the deregulation of genes associated with differentiation. Taken together, our data characterise Fam60a as an essential core subunit of a variant Sin3a complex in ES cells required to promote rapid proliferation and to prevent unscheduled differentiation.

2017-05-19 | PXD005464 | Pride

Regulatory RNA Apela Is a Component of a Negative Feedback Loop Regulating p53-Mediated Apoptosis in Embryonic Stem Cells (II)

Project description:The goal is to identify regulatory RNAs that regulate the p53 signaling pathway in embryonic stem (ES) cells.

2015-06-05 | GSE60843 | GEO

Cooperative treatment effectiveness of VE821 and AUY922 in Ewing’s sarcoma cells

Project description:Ewing's sarcoma (ES) is the second most frequent bone cancer during childhood and adolescence originating from a translocation between the EWSR1 and the FLI1 gene, which inactivates BRCA-mediated DNA damage response. Both ATR and HSP90 inhibitors are promising new candidates in the field of ES treatment. We show that the HSP90 inhibitor AUY922 alone induced DNA damages, apoptosis and ER stress, while reducing the abundance of DNA repair proteins. The combinations of the ATR inhibitor VE821 and AUY922 (AUY-VE) led to strong apoptosis induction in ES cell lines, originating from a common set of molecular targets and independent of their p53 status, yet based on different molecular mechanisms. P53 wild-type ES cells activated pro-apoptotic gene transcription and underwent mitochondria-mediated apoptosis. P53 null ES cells, however, accumulated higher level of DNA damage, ER stress and autophagy, finally leading to apoptosis. Moreover, AUY-VE treatment compromised ES cell vitality due to impaired PI3K/AKT/mTOR signaling. Unexpectedly, the combinations of AUY922 with the ATM inhibitor, KU55933 failed to kill ES cells and showed protective effects compared to AUY-VE. In summary, we provide mechanistic insights into the effective ES cell killing by ATR and HSP90 inhibitor combinations, which also offers a targetable approach for BRCA-deficient tumors, irrespective of their p53 status and may give rise to new therapeutic strategies.

2021-09-09 | PXD021562 | Pride

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