Gene expression profile of Epiblast stem cells
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE75660 | GEO | 2018/11/30
REPOSITORIES: GEO
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Project description:This analysis compares the expression profiles of CGR8 ES cells, E3 epiblast stem cells, and E3R cells (E3 EpiSCs reverted to an ES-like state).
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Project description:The pluripotency of mammalian early and late epiblast could be recapitulated by naïve embryonic stem cells (ESCs) and primed epiblast stem cells (EpiSCs), respectively. However, these two states of pluripotency may not be sufficient to reflect the full complexity and developmental potency of the epiblast during mammalian early development. Here we report the establishment of self-renewing formative pluripotent stem cells (fPSCs) which manifest features of epiblast cells poised for gastrulation. fPSCs can be established from different mouse ESCs, pre-/early-gastrula epiblasts and induced PSCs. Similar to pre-/early-gastrula epiblasts, fPSCs show the transcriptomic features of formative pluripotency, which are distinct from naïve ESCs and primed EpiSCs. fPSCs show the unique epigenetic states of E6.5 epiblast, including the super-bivalency of a large set of developmental genes. Just like epiblast cells immediately before gastrulation, fPSCs can efficiently differentiate into three germ layers and primordial germ cells (PGCs) in vitro. Thus, fPSCs highlight the feasibility of using PSCs to explore the development of mammalian epiblast.
2021-02-19 | GSE154290 | GEO
Project description:Primitive ectoderm cells (PE) in blastocysts represent the foundation of the pluripotent state, which is lost progressively during development. For example, development of epiblast cells from PE in postimplantation embryos is accompanied by transcriptional and epigenetic changes, including DNA methylation and X inactivation (Refs); these changes alter the nature of epiblast cells fundamentally, affecting their responsiveness to signaling molecules, and constitute a robust boundary that prevents their reversion to a PE-like state. Notably, epiblast cells unlike PE, are refractory to leukaemia inhibitory factor (LIF)/STAT3 signalling in vitro; instead, they respond to FGF/Activin to form self-renewing epiblast stem cells (EpiSCs) that are like human ES cells, which differ significantly from mouse embryonic stem cells (ES) derived from PE. However, here we show that under appropriate conditions, epiblast cells from postimplantation embryos can respond to LIF/STAT3/fetal calf serum (FCS), and undergo reprogramming to form embryonic stem cell -like cells (repiES: reprogrammed epiblast ES-like cells). Reprogramming of epiblast cells occurs progressively. First, they form colonies that retain key properties of epiblast cells (cEpi: cultured epiblast), which subsequently show erasure of epigenetic modifications, including DNA demethylation and X-reactivation to generate repiES. Analysis also revealed that repiES progressively acquire a transcriptome profile of ES cells that is distinct from cEpi and EpiSCs. In chimeras, repiES contributed to all the tissues, including germ cells. Thus, we show for the first time that reversion of epiblast cells to repiES phenotype entails progressive loss of phenotypic and epigenetic memory of epiblast cells. Our study provides insights into underlying mechanisms, and a tractable model for how signaling molecules induce epigenetic reprogramming of cells leading to an elemental pluripotent state.
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Project description:The epiblast is the first cell type that forms apical-basal polarity de novo as the mouse embryo implants into the maternal uterus, while the extraembryonic neighbours of the epiblast - trophectoderm and primitive endoderm - retain their pre-established polarity beyond implantation [1]; however, it is still unclear how the epiblast establishes apical-basal polarity de novo. Here, we focused on Rap1 signaling pathway, which is activated during the transition of the epiblast from the naïve to primed state of pluripotency during implantation [2]. Through the preestablished in vitro three-dimensional culture system [3], genetic knockouts and proximity-biotinylation analyses, we found that Rap1 integrates multiple signals that contribute to de novo formation of apical-basal polarity. Importantly, formation of apical-basal polarity in the epiblast is essential for its correct patterning and proper communication with the extraembryonic lineages. Altogether, these results not only dissect molecular details of de novo apical-basal polarity formation, but also have broader implications for epithelial polarity and development.
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Project description:Pluripotent cells emerge as a naïve founder population in the blastocyst, acquire capacity for germline and soma formation, and then undergo lineage priming. Mouse embryonic stem (ES) cells and epiblast stem cells (EpiSCs) respectively represent the initial naïve and final primed phases of pluripotency. Here we investigated the intermediate formative stage. Using minimal exposure to specification cues, we derived stem cells from formative mouse epiblast. Unlike ES cells or EpiSCs, formative stem (FS) cells responded directly to germ cell induction. They colonised somatic tissues and germline in chimaeras. Whole transcriptome analyses showed similarity to pre-gastrulation formative epiblast. Signal responsiveness and chromatin accessibility features reflect lineage capacitation. Furthermore, FS cells showed distinct transcription factor dependencies, relying critically on Otx2. Finally, FS cell culture conditions applied to human naïve cells or embryos supported expansion of similar stem cells, consistent with a conserved staging post on the trajectory of mammalian pluripotency.
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Project description:Pluripotent cells emerge as a naïve founder population in the blastocyst, acquire capacity for germline and soma formation, and then undergo lineage priming. Mouse embryonic stem (ES) cells and epiblast stem cells (EpiSCs) respectively represent the initial naïve and final primed phases of pluripotency. Here we investigated the intermediate formative stage. Using minimal exposure to specification cues, we derived stem cells from formative mouse epiblast. Unlike ES cells or EpiSCs, formative stem (FS) cells responded directly to germ cell induction. They colonised somatic tissues and germline in chimaeras. Whole transcriptome analyses showed similarity to pre-gastrulation formative epiblast. Signal responsiveness and chromatin accessibility features reflect lineage capacitation. Furthermore, FS cells showed distinct transcription factor dependencies, relying critically on Otx2. Finally, FS cell culture conditions applied to human naïve cells or embryos supported expansion of similar stem cells, consistent with a conserved staging post on the trajectory of mammalian pluripotency.
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Project description:Pluripotent cells emerge as a naïve founder population in the blastocyst, acquire capacity for germline and soma formation, and then undergo lineage priming. Mouse embryonic stem (ES) cells and epiblast stem cells (EpiSCs) respectively represent the initial naïve and final primed phases of pluripotency. Here we investigated the intermediate formative stage. Using minimal exposure to specification cues, we derived stem cells from formative mouse epiblast. Unlike ES cells or EpiSCs, formative stem (FS) cells responded directly to germ cell induction. They colonised somatic tissues and germline in chimaeras. Whole transcriptome analyses showed similarity to pre-gastrulation formative epiblast. Signal responsiveness and chromatin accessibility features reflect lineage capacitation. Furthermore, FS cells showed distinct transcription factor dependencies, relying critically on Otx2. Finally, FS cell culture conditions applied to human naïve cells or embryos supported expansion of similar stem cells, consistent with a conserved staging post on the trajectory of mammalian pluripotency.
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Project description:Pluripotent cells emerge as a naïve founder population in the blastocyst, acquire capacity for germline and soma formation, and then undergo lineage priming. Mouse embryonic stem (ES) cells and epiblast stem cells (EpiSCs) respectively represent the initial naïve and final primed phases of pluripotency. Here we investigated the intermediate formative stage. Using minimal exposure to specification cues, we derived stem cells from formative mouse epiblast. Unlike ES cells or EpiSCs, formative stem (FS) cells responded directly to germ cell induction. They colonised somatic tissues and germline in chimaeras. Whole transcriptome analyses showed similarity to pre-gastrulation formative epiblast. Signal responsiveness and chromatin accessibility features reflect lineage capacitation. Furthermore, FS cells showed distinct transcription factor dependencies, relying critically on Otx2. Finally, FS cell culture conditions applied to human naïve cells or embryos supported expansion of similar stem cells, consistent with a conserved staging post on the trajectory of mammalian pluripotency.
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Project description:Recently, (in vitro) pluripotent EpiSCs were derived from the post-implantation egg cylinder stage epiblasts of mouse and rat. These EpiSCs resemble and correspond very closely to the conventional human embryonic stem cells (hESCs) in the colony morphology and culture/signaling requirements for maintaining pluripotency, but exhibit a range of significant phenotypic and signaling response differences from the conventional mouse ES cells (mESCs). These observations strongly support the notion that EpiSCs and hESCs are intrinsically similar, and raise an attractive hypothesis: as mESCs and EpiSCs/hESCs represent two distinct pluripotency states: the mESC-like state representing the ICM of pre-implantation blastcyst and the EpiSC-like state representing the post-implantation epiblasts, whether the epiblast state (including conventional hESCs) can be converted back to the ICM state. Despite studies providing evidence that epiblast-like cells exist and transition back and forth within colony of conventional mESCs; mESCs and EpiSCs share substantial set of pluripotency transcriptional factors, including Oct4, Sox2 and Nanog; and mESCs are more stable in culture, in the present study we found that EpiSCs differentiated rapidly under mESC culture conditions and no âspontaneouslyâ converted mESC could be readily identified and isolated over serial passages at the population or clonal level. Remarkably, we found that blockage of the TGFβ pathway or inhibition of the H3K4 demethylase LSD1 with small molecule inhibitors induced dramatic morphological changes of EpiSCs towards mESC phenotypes with activation of some ICM-specific gene expression. However, full conversion of EpiSCs to a mESC-like state with competence to chimeric contribution can only be readily generated with a combination of inhibitors of LSD1 and ALK. These observations underscore a powerful and direct induction of reprogramming from the developmentally later-stage EpiSCs to a mESC-like stage by a synergy of signaling and direct epigenetic modulations. It also highlights a significant role for TGFβ pathway inhibition in promoting reprogramming to and sustaining true pluripotency, which further supports our recent studies in generating chimerism-competent rat pluripotent cells. Collectively, our studies provide a proof-of-concept demonstration that pluripotency-restricted EpiSCs can be readily converted to a mESC-like state in the absence of any genetic manipulation by precise pharmacological control of signaling pathways that distinguish the two pluripotency states and an epigenetic target simultaneously, and offer a convenient experimental system to further study the mechanism. Such method and concept may also provide an avenue for generating a new type of mESC-like human pluripotent cell. Global gene-expression analyses of the parnate/mAMFGi cells
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