RT Journal Article SR Electronic T1 Establishment in Culture of Expanded Potential Stem Cells JF bioRxiv FD Cold Spring Harbor Laboratory SP 124479 DO 10.1101/124479 A1 Jian Yang A1 David J. Ryan A1 Wei Wang A1 Jason Cheuk-Ho Tsang A1 Guocheng Lan A1 Hideki Masaki A1 Xuefei Gao A1 Liliana Antunes A1 Yong Yu A1 Zhexin Zhu A1 Juexuan Wang A1 Aleksandra A. Kolodziejczyk A1 Lia S. Campos A1 Cui Wang A1 Fengtang Yang A1 Zhen Zhong A1 Beiyuan Fu A1 Melanie Eckersley-Maslin A1 Michael Woods A1 Yosuke Tanaka A1 Adam C. Wilkinson A1 James Bussell A1 Jacqui White A1 Ramiro Ramirez-Solis A1 Wolf Reik A1 Berthold Göttgens A1 Sarah A. Teichmann A1 Hiromitsu Nakauchi A1 Xiangang Zou A1 Liming Lu A1 Pentao Liu YR 2017 UL http://biorxiv.org/content/early/2017/04/06/124479.abstract AB Mouse embryonic stem cells are derived from in vitro explantation of blastocyst epiblasts1,2 and contribute to both the somatic lineage and germline when returned to the blastocyst3 but are normally excluded from the trophoblast lineage and primitive endoderm4–6. Here, we report that cultures of expanded potential stem cells (EPSCs) can be established from individual blastomeres, by direct conversion of mouse embryonic stem cells (ESCs) and by genetically reprogramming somatic cells. Remarkably, a single EPSC contributes to the embryo proper and placenta trophoblasts in chimeras. Critically, culturing EPSCs in a trophoblast stem cell (TSC) culture condition permits direct establishment of TSC lines without genetic modification. Molecular analyses including single cell RNA-seq reveal that EPSCs share cardinal pluripotency features with ESCs but have an enriched blastomere transcriptomic signature and a dynamic DNA methylome. These proof-of-concept results open up the possibility of establishing cultures of similar stem cells in other mammalian species.