Abstract
Here we describe repressible (PipOFF) as well as inducible (PipON) systems for regulated gene expression in mammalian cells, based on the repressor Pip (pristinamycin-induced protein), which is encoded by the streptogramin resistance operon of Streptomyces coelicolor. Expression of genes placed under control of these systems was responsive to clinically approved antibiotics belonging to the streptogramin group (pristinamycin, virginiamycin, and Synercid). The versatility of these systems was demonstrated by streptogramin-regulated expression of mouse erythropoietin (EPO), human placental secreted alkaline phosphatase (SEAP), or green fluorescent protein (GFP) in diverse cell lines (BHK, CHO, HeLa, and mouse myoblasts). Analysis of isogenic constructs in CHO cells demonstrated the PipOFF system gave lower background and higher induction ratios than the widely used tetracycline-repressible (TetOFF) expression systems. The streptogramin-based expression technology was functionally compatible with the TetOFF system, thus enabling the selective use of different antibiotics to independently control two different gene activities in the same cell.
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Acknowledgements
We thank U. Billeter for providing pristinamycin and its derivatives, E. Niederer for FACS sorting, S. Moser for construction of pDuoRex1 precursors, P. Aebischer for EPO expression construct pM48cDNAmEPO, and P. Viollier, M. Folcher, and U. Billeter for their generous advice during the project. This work was supported by Cistronics Cell Technology GmbH (Einsteinstrasse, P.O. Box 145, CH-8093 Zurich, Switzerland).
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Fussenegger, M., Morris, R., Fux, C. et al. Streptogramin-based gene regulation systems for mammalian cells. Nat Biotechnol 18, 1203–1208 (2000). https://doi.org/10.1038/81208
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DOI: https://doi.org/10.1038/81208
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