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. 1992 Aug 1;89(15):6721–6725. doi: 10.1073/pnas.89.15.6721

Fluorescence-activated sorting of totipotent embryonic stem cells expressing developmentally regulated lacZ fusion genes.

S Reddy 1, H Rayburn 1, H von Melchner 1, H E Ruley 1
PMCID: PMC49575  PMID: 1495960

Abstract

Murine embryonic stem (ES) cells were infected with a retrovirus promoter trap vector, and clones expressing lacZ fusion genes (LacZ+) were isolated by fluorescence-activated cell sorting (FACS). Of 12 fusion genes tested, 1 was repressed when ES cells were allowed to differentiate in vitro. Two of three lacZ fusion genes tested were passed into the germ line, indicating that FACS does not significantly affect stem cell totipotency. The pattern of lacZ expression observed in vivo was consistent with that seen in vitro. Both fusion genes were expressed in preimplantation blastulas. However, a fusion gene whose expression was unaffected by in vitro differentiation was ubiquitously expressed in day-10 embryos, while the other, which showed regulated expression in vitro, was restricted to cells located along the posterior neural fold, the optic chiasm, and within the fourth ventricle. These results demonstrate the utility of using promoter trap vectors in conjunction with fluorescence sorting to disrupt developmentally regulated genes in mice.

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