Epiblast stem cell subpopulations represent mouse embryos of distinct pregastrulation stages

Dong Wook Han, Natalia Tapia, Jin Young Joo, Boris Greber, Marcos J Araúzo-Bravo, Christof Bernemann, Kinarm Ko, Guangming Wu, Martin Stehling, Jeong Tae Do, Hans R Schöler
Cell 2010 November 12, 143 (4): 617-27
Embryonic stem cells (ESCs) comprise at least two populations of cells with divergent states of pluripotency. Here, we show that epiblast stem cells (EpiSCs) also comprise two distinct cell populations that can be distinguished by the expression of a specific Oct4-GFP marker. These two subpopulations, Oct4-GFP positive and negative EpiSCs, are capable of converting into each other in vitro. Oct4-GFP positive and negative EpiSCs are distinct from ESCs with respect to global gene expression pattern, epigenetic profile, and Oct4 enhancer utilization. Oct4-GFP negative cells share features with cells of the late mouse epiblast and cannot form chimeras. However, Oct4-GFP positive EpiSCs, which only represent a minor EpiSC fraction, resemble cells of the early epiblast and can readily contribute to chimeras. Our findings suggest that the rare ability of EpiSCs to contribute to chimeras is due to the presence of the minor EpiSC fraction representing the early epiblast.

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