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      Activin/Nodal signalling maintains pluripotency by controlling Nanog expression.

      Development (Cambridge, England)

      Activins, metabolism, Animals, Biological Markers, Bone Morphogenetic Proteins, Cell Differentiation, Cells, Cultured, Fibroblast Growth Factor 2, Gene Expression Profiling, Gene Expression Regulation, Developmental, Germ Layers, embryology, Homeodomain Proteins, genetics, Humans, Mice, Neurons, Nodal Protein, Pluripotent Stem Cells, Signal Transduction, Smad2 Protein, Smad3 Protein

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          Abstract

          The pluripotent status of embryonic stem cells (ESCs) confers upon them the capacity to differentiate into the three primary germ layers, ectoderm, mesoderm and endoderm, from which all the cells of the adult body are derived. An understanding of the mechanisms controlling pluripotency is thus essential for driving the differentiation of human pluripotent cells into cell types useful for clinical applications. The Activin/Nodal signalling pathway is necessary to maintain pluripotency in human ESCs and in mouse epiblast stem cells (EpiSCs), but the molecular mechanisms by which it achieves this effect remain obscure. Here, we demonstrate that Activin/Nodal signalling controls expression of the key pluripotency factor Nanog in human ESCs and in mouse EpiSCs. Nanog in turn prevents neuroectoderm differentiation induced by FGF signalling and limits the transcriptional activity of the Smad2/3 cascade, blocking progression along the endoderm lineage. This negative-feedback loop imposes stasis in neuroectoderm and mesendoderm differentiation, thereby maintaining the pluripotent status of human ESCs and mouse EpiSCs.

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          Journal
          19279133
          2687465
          10.1242/dev.033951

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