Mus musculus
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA135799 | ENA |
REPOSITORIES: ENA
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Project description:Extraembryonic trophoblast stem cells (TSC) can be converted to induced pluripotent stem cells (TSC-iPSCs) by overexpressing Oct4, Sox2, Klf4 and cMyc. TSC lines were derived from mice harboring a doxycycline inducible Oct4 allele and an Oct4-GFP reporter that has been demonstrated to be activated in cells upon acquisition of pluripotency. Oct4-GFP-positive blastocysts were collected at 3.5 dpc and transduced with lentiviruses encoding doxycycline inducible Sox2, Klf4 and cMyc transgenes (4FTSC). 4FTSC lines were passaged 10 times to establish a population of constantly growing, self-renewing TSCs in the presence of FGF4 and fibroblast conditioned media. To induce lineage conversion, 4FTSCs were cultured under ESC/Lif conditions and doxycycline. After 28 days, several colonies displaying ESC-characteristic dome-shaped colony morphology and bright Oct4-GFP fluorescence could be detected. The 4FTSC-derived colonies were isolated mechanically, dissociated by trypsinization, and plated onto MEFs in ESC medium without doxycycline demonstrating the independence of exogenous factors. They will be called TSC-iPSCs (Trophoblast stem cell derived induced pluripotent stem cells). To examine if the extraembryonic lineage-specific mRNA profile was overcome, the gene-expression profiles of TSC-iPSCs and their parental 4FTSCs were analyzed by microarray analyses and compared to control ESCs.
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Project description:Classical mouse embryology has established a paradigm of early development drivenby sequential lineage bifurcations. Accordingly, mouse embryonic stem cells derivedfrom early epiblast have lost the potency to produce extraembryonic trophectoderm.We show in contrast that human naive epiblast cells readily make trophectoderm.Inhibition of ERK signalling, instrumental in naive stem cell propagation, unexpectedlypotentiates trophectoderm formation, an effect enhanced by Nodal inhibition.Transcriptome analyses authenticate conversion into trophectoderm with subsequentproduction of syncitiotrophoblast, cytotrophoblast and trophoblast stem cells. Geneticperturbations indicate that NANOG suppresses and TFAP2C enables trophectoderminduction. Consistent with post-implantation progression, trophectoderm potential isextinguished in conventional human pluripotent stem cells, which instead makeamnion. Finally, human embryo epiblasts from late blastocysts efficiently generatetrophectoderm and differentiated trophoblast. Thus, pluripotent cells in the humanembryo retain extraembryonic lineage plasticity and regenerative potential untilimplantation. Harnessing this unanticipated regulative capacity may be beneficial forassisted reproduction technology.
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