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The efficiency of embryonic stem (ES) cell derivation relies on an optimized culture medium and techniques for treating preimplantation stage embryos. Recently, ES cell derivation from the preblastocyst developmental stage was reported by removing the zona pellucida from embryos of the most efficient strain for ES cell derivation (129Sv) during early preimplantation. Here, we showed that ES cells can be efficiently derived and maintained in a modified medium (MEMα), from preblastocysts of a low-efficiency mouse strain (a hybrid consisting of 50% B6, 25% CBA, and 25% DBA). Preblastocyst-derived ES cell lines were normal in terms of pluripotency-related protein expression, and chromosome number. Also, preblastocyst-derived ES cell lines from various culture conditions showed pluripotency in vivo through teratoma analysis. Interestingly, ES cell lines produced from preblastocysts and blastocysts, regardless of the derivation culture conditions, are nearly indistinguishable by their global gene expression profiles.

cellular reprogramming

Established Preblastocyst- and Blastocyst-Derived ES Cell Lines Have Highly Similar Gene Expression Profiles, Despite Their Differing Requirements for Derivation Culture Conditions