Abstract
This protocol describes the derivation and culture of epiblast stem cells (EpiSCs) from early postimplantation epiblasts. EpiSCs can be maintained in an undifferentiated state and retain the ability to generate tissues from all three germ layers in vitro and to form teratomas in vivo. However, they seem unable to form chimeras. Whether this is due to differences in developmental status or a cellular incompatibility (e.g., cell adhesion) between EpiSCs and the host inner cell mass (ICM) is currently unclear. Other differences between mouse embryonic stem (ES) cells and EpiSCs also exist, including gene expression profiles and different growth factor requirements for self-renewal. Thus, EpiSCs provide an important in vitro model for studying the establishment and maintenance of pluripotency in postimplantation epiblast tissues.
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