Abstract
Transformation of PCC4 mouse teratocarcinoma stem cells was obtained using a dominant selective marker, the enzyme xanthine-guanine phosphoribosyltransferase (XGPRT), coded by the bacterial Eco.gpt gene placed under the control of the early SV40 genes in the vector pSV2gpt. An average of 20 colonies of transformed cells was obtained, using the calcium phosphate technique, 10 microg DNA vector, no carrier DNA and 1 x 10(6) recipient cells. Five independent Eco.gpt-transformed PCC4 cell lines were propagated in selective medium and assayed for XGPRT activity. All of them had the ability to convert [14C]xanthine to xanthine monophosphate. pSV2gpt sequences were present and associated with high mol. wt. cellular DNA. pSV2gpt sequences and XGPRT activity were both conserved in the three clones that were propagated in non-selective medium for 30 generations. The transformed PCC4 cells retained their ability to produce, in host mice, teratocarcinoma tumors composed of embryonal carcinoma and various differentiated tissues. Thus, pSV2gpt can be used as a dominant marker to select teratocarcinoma stem cells co-transformed with genes that are not selectable by themselves.
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Selected References
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