Strategies for the isolation and characterization of bovine embryonic stem cells [review]. [Symposium paper]
1994
Cherny, R.A. | Stokes, T.M. | Merei, J. | Lom, L. | Brandon, M.R. | Williams, R.L. (Melbourne Univ., Parkville (Australia). Centre for Animal Biotechnology)
The practical application of advanced breeding technologies and genetic manipulation of domestic animals is dependent on the efficient and routine isolation of embryonic stem (ES) cell lines from these species. ES cell lines of proven totipotency have thus far been isolated only from the mouse. Murine ES cells can be identified by a number of criteria including morphology and characteristics in culture, the presence of specific markers, differentiative capacity and contribution to chimaeras. Reported cell lines derived from ruminant preimplantation embryos do not stably exhibit these characteristics. As demonstrated for the mouse, primordial germ cells may provide an alternative source for pluripotential cell lines. The isolation, culture and preliminary characterization of bovine primordial germ cell-derived (PGCd) cells are described. The PGCd cells are capable of differentiation in vitro and display murine ES cell markers including alkaline phosphatase. With farm animals, long generation intervals and small numbers of offspring make it important to first develop in vitro techniques for evaluating chimaeric embryos. When PGCd cells were labelled with a fluorochrome marker and injected into blastocysts and the chimaeric embryos were monitored in vitro, preliminary results showed that the labelled cells incorporate preferentially within the inner cell mass of the host blastocyst.
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