Abstract
Cell–cell signaling in microorganisms is still poorly characterized. In this Methods paper, we describe a genetic procedure for detecting cell-nonautonomous genetic effects, and in particular cell–cell signaling, termed the chimeric colony assay (CCA). The CCA measures the effect of a gene on a biological response in a neighboring cell. This assay can measure cell autonomy for range of biological activities including transcript or protein accumulation, subcellular localization, and cell differentiation. To date, the CCA has been used exclusively to investigate colony patterning in the budding yeast Saccharomyces cerevisiae. To demonstrate the wider potential of the assay, we applied this assay to two other systems: the effect of Grr1 on glucose repression of GAL1 transcription in yeast and the effect of rpsL on stop-codon translational readthrough in Escherichia coli. We also describe variations of the standard CCA that address specific aspects of cell–cell signaling, and we delineate essential controls for this assay. Finally, we discuss complementary approaches to the CCA. Taken together, this Methods paper demonstrates how genetic assays can reveal and explore the roles of cell–cell signaling in microbial processes.
Data availability
Strains and plasmids are available upon request. For supplementary files, Table S1 lists genotypes for each yeast strain. Table S2 lists genotypes for each bacterial strain. Table S3 lists the plasmids used.
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Acknowledgements
We thank Dr. Michael O’Connor (University of Missouri-Kansas City, UMKC) for E. coli strains and helpful advice, Dr. Robert West (SUNY-Upstate) for the GAL1-LacZ plasmid, and Richard Hastings (Kansas University Medical Center Flow Cytometry Core Lab). We acknowledge the use of the confocal microscope in the UMKC School of Dentistry Confocal Microscopy Core. This facility is supported by the UMKC Office of Research Services, UMKC Center of Excellence in Dental and Musculoskeletal Tissues, and National Institutes of Health (NIH) Grants S10RR027668 and S10OD021665. Research reported in this publication was supported by the National Institutes of General Medical Sciences of the NIH to S.M.H. under award number R15GM135807. The content of this article is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.
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Research reported in this publication was funded by National Institute of General Medical Sciences of the National Institutes of Health under award R15GM135807.
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Piccirillo, S., Morgan, A.P., Leon, A.Y. et al. Investigating cell autonomy in microorganisms. Curr Genet 68, 305–318 (2022). https://doi.org/10.1007/s00294-022-01231-5
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DOI: https://doi.org/10.1007/s00294-022-01231-5