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- W2079561662 abstract "The pathobiological effects of oncogenes on normal differentiation of mouse embryonic stem cells from 4-day embryos were examined by introducing active ras, myc, and SV40 large T genes, all driven by mouse metallothionein I enhancer and promoter. Stem cell clones R5, M3, and T2 for ras, myc, and SV40 T genes, respectively, were particularly chosen for analyses because of their higher levels of transgene expression and their diploid chromosomal constitutions. These stem cells were then introduced into host 4-day embryos and the embryos were allowed to develop in the uterus of foster mothers. The stem cells colonized the tissues as extensively as the parent cells and gave rise to adult chimera with no apparent loss or abnormality of the embryos. The active ras and myc oncogenes introduced were expressed not only in the stem cells, but also in the developing embryos and in a variety of tissues of adult chimeras. However, although T antigen was originally expressed in the stem cells, it was not expressed in either developing embryos or tissues of adult chimeras. Induced by retinoic acid treatment in vitro or by subcutaneous grafting, this suppression of T-gene expression was also confirmed in differentiated progeny cells from several stem cell clones expressing T antigen. Permanent lines of fibroblast-like cells could be established at higher frequency from primary cultures of tissues of chimera, subcutaneous differentiated cells, and in vitro differentiated cells derived from T2 cells, and all these clones reexpressed T antigen. The results suggest that active myc and ras genes can be compatible with normal differentiation of the stem cells, but the expression of T antigen is specifically suppressed with recognition of its coding domain." @default.
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- W2079561662 date "1988-09-01" @default.
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- W2079561662 title "Active ras and myc oncogenes can be compatible, but Sv40 large T antigen is specifically suppressed with normal differentiation of mouse embryonic stem cells" @default.
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- W2079561662 doi "https://doi.org/10.1016/0014-4827(88)90382-5" @default.
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