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Direct Reprogramming of Mouse Embryonic Fibroblasts to Induced Trophoblast Stem Cells.

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Trophoblast cells are the first committed lineage to emerge during mammalian preimplantation embryo development. Trophoblast stem (TS) cells can be derived from the trophectoderm (TE) of blastocyst-stage embryos and differentiate into… Click to show full abstract

Trophoblast cells are the first committed lineage to emerge during mammalian preimplantation embryo development. Trophoblast stem (TS) cells can be derived from the trophectoderm (TE) of blastocyst-stage embryos and differentiate into extraembryonic trophoblast cells of the placenta. While mouse TS cells are an indispensable tool to study placental development, and reproductive diseases such as implantation failure and recurrent miscarriage, human TS cells have not been isolated. To model human trophoblast development and to investigate trophoblast-specific causes of reproductive diseases, it will be important to derive human induced trophoblast stem (iTS) cells. Recent studies have shown that fibroblasts can be reprogrammed to iTS cells by overexpressing four transcription factors (TFs) including TFAP2C, GATA3, EOMES, and ETS2. Here, we describe a protocol to directly convert mouse embryonic fibroblasts (MEFs) to iTS cells following overexpression of 10 TFs. iTS cells are capable of self-renewing using conventional TS cell culture media supplemented with the external signal FGF4 and heparin. iTS cells are also able to differentiate into trophoblast lineages.

Keywords: induced trophoblast; trophoblast; stem cells; trophoblast stem; mouse

Journal Title: Methods in molecular biology
Year Published: 2020

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