Abstract
Phenotypes that might otherwise reveal a gene's function can be obscured by genes with overlapping function. This phenomenon is best known within gene families, in which an important shared function may only be revealed by mutating all family members. Here we describe the 'green monster' technology that enables precise deletion of many genes. In this method, a population of deletion strains with each deletion marked by an inducible green fluorescent protein reporter gene, is subjected to repeated rounds of mating, meiosis and flow-cytometric enrichment. This results in the aggregation of multiple deletion loci in single cells. The green monster strategy is potentially applicable to assembling other engineered alterations in any species with sex or alternative means of allelic assortment. To test the technology, we generated a single broadly drug-sensitive strain of Saccharomyces cerevisiae bearing precise deletions of all 16 ATP-binding cassette transporters within clades associated with multidrug resistance.
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Acknowledgements
This work was supported by US National Institutes of Health grants R01 HG003224 and R21 CA130266 to F.P.R. O.D.K. was supported by a National Research Service Award fellowship from the National Institutes of Health–National Human Genome Research Institute. Micrographs were generated at Nikon Imaging Center at Harvard Medical School. We are grateful for yeast strains from C. Boone (University of Toronto) and A. Goffeau (Université catholique de Louvain), and for advice and assistance from M. Al-Shawi, B.J. Andrews, C. Baisden, R. Balasubramanian, W. Bender, C. Boone, R. Brost, S. Buratowski, D. Chowdhury, G.M. Church, D. Coen, E. Craig, E. Elion, M. Fenerjian, D. Gibson, J. Glass, A. Goffeau, R. Grene, C. Hutchison, S. Iwase, M. Johnston, B. Karas, K. Kono, K. Kuchler, J. Li, D. Morgan, S. Moye-Rowley, J. Murai, S. Oliver, F. Ozbek, Y. Pan, D. Pellman, A. Ramon, J. Rine, A. Rowat, P. Silver, H. Smith, M. Springer, K. Struhl, C. Tagwerker, M. Takahashi, B. Turcotte, D. Weitz and S. Yoshida; members of the Roth Lab, especially M. Tasan, J. Mellor, J. Komisarof, J. MacKay, A. Derti and S. Komili; and members of the Dana-Farber Center for Cancer Systems Biology, especially P. Braun, A. Dricot, D. Hill, Q. Li and H. Yu.
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Y.S. and F.P.R. developed the green monster method and prepared the manuscript; R.P.S.O., A.H., J.L. and Y.S. measured drug sensitivity; R.M. analyzed growth curves; O.D.K. simulated the process; L.V.Z., C.N. and G.G. advised on method design; A.H.Y.T., V.M.L., V.N.G. and M.V. provided reagents and advice; W.C. and L.P. provided technical support; P.S. and Y.S. performed flow cytometry.
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Suzuki, Y., Onge, R., Mani, R. et al. Knocking out multigene redundancies via cycles of sexual assortment and fluorescence selection. Nat Methods 8, 159–164 (2011). https://doi.org/10.1038/nmeth.1550
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DOI: https://doi.org/10.1038/nmeth.1550
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