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- W2012202916 abstract "We describe a recombinant plasmid, pBBPY1, containing polyoma virus sequences which persists episomally in mouse hepatoma (MH) cells and can be shuttled between these cells and bacteria. This plasmid is composed of a subgenomic fragment of a polyoma virus mutant that includes two origins of replication; sequences of plasmid pML2; the xanthine-guanine phosphoribosyltransferase gene of Escherichia coli (Ecogpt) under the control of SV40 early-region promoter and RNA processing signals, providing a dominant selectable marker for mammalian transfection. MH cells from colonies growing in HAT medium (hypoxanthine, aminopterin and thymidine) were found to contain vector DNA molecules in an episomal state, the majority of them unrearranged. When HAT-selective pressure was applied for only 3 days, the resulting cells contained up to 50-100 copies of intact plasmid, i.e. 20-fold more than cells grown under standard selection conditions with continuous HAT-selective pressure. Contrary to standard conditions, transient selection does not alter the epithelial morphology nor ability of transfected hepatoma cells to produce albumin." @default.
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- W2012202916 date "1986-09-01" @default.
- W2012202916 modified "2023-10-16" @default.
- W2012202916 title "A polyoma-derived plasmid vector maintained episomally in both E. coli and mouse hepatoma cells" @default.
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- W2012202916 doi "https://doi.org/10.1016/0014-4827(86)90508-2" @default.
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