Abstract
We have developed a widely applicable functional genomics strategy based on alphavirus expression vectors. The technology allows for rapid identification of genes encoding a functional activity such as binding of a defined ligand. Complementary DNA (cDNA) libraries were expressed in mammalian cells following infection with recombinant Sindbis virus (SIN replicon particles), a member of the Alphavirus genus. Virus-infected cells that specifically bound a ligand of choice were isolated using fluorescence-activated cell sorting (FACS). Replication-competent, infective SIN replicon particles harboring the corresponding cDNA were amplified in a next step. Within one round of selection, viral clones encoding proteins recognized by monoclonal antibodies or Fc-fusion molecules could be isolated and sequenced. Moreover, using the same viral libraries, a plaque-lift assay was established that allowed the identification of secreted, intracellular, and membrane proteins.
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Acknowledgements
We thank Dr Gary Jennings and Mark Dyer for carefully reading the manuscript and Prof. Sondra Schlesinger for many helpful discussions and for providing the plasmids pSinRep5 and pDH-EB. This article is dedicated to the memory of Prof. James E. Bailey, who passed away during the preparation of the manuscript.
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Koller, D., Ruedl, C., Loetscher, M. et al. A high-throughput alphavirus-based expression cloning system for mammalian cells. Nat Biotechnol 19, 851–855 (2001). https://doi.org/10.1038/nbt0901-851
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DOI: https://doi.org/10.1038/nbt0901-851
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