Feeder-Dependent/Independent Mouse Embryonic Stem Cell Culture Protocol.

Mouse embryonic stem cells (mESCs) were first derived and cultured nearly 30 years ago and have been beneficial tools to create transgenic mice and to study early mammalian development so far. Fibroblast feeder cell layers are often used at some stage in the culture protocol of mESCs. The feeder layer-often mouse embryonic fibroblasts (MEFs)-contribute to the mESC culture as a substrate to increase culture efficiency, maintain pluripotency, and facilitate survival and growth of the stem cells. Various feeder-dependent and feeder-independent culture and differentiation protocols have been established for mESCs. Here we describe the isolation, culture, and preparation feeder cell layers and establishment of feeder-dependent/independent protocol for mESC culture. In addition, basic mESC protocols for culture, storage, and differentiation were described.