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Journal Articles Journal of Microbiological Methods Year : 2018

Use of photoswitchable fluorescent proteins for droplet-based microfluidic screening

Abstract

11 Application of droplet-based microfluidics for the screening of microbial libraries is one of the 12 important ongoing development in functional genomics/metagenomics. In this article, we propose a 13 new method that can be employed for the high-throughput profiling of cell growth. It consists in light-14 driven labelling droplets that contain growing cells directly in microfluidics observation chamber, 15 followed by recovery of the labelled cells. This method is based on intracellular expression of green to 16 red switchable fluorescent proteins. The proof of concept is established here for two commonly used 17 biological models, E.coli and S.cerevisiae. Growth of cells in droplets was monitored under a 18 microscope and, depending on the targeted phenotype, the fluorescence of selected droplets was 19 switched from a "green" to a "red" state. Red fluorescent cells from labelled droplets were then 20 successfully detected, sorted with the Fluorescence Activated Cell Sorting machine and recovered. 21 Finally, the application of this method for different kind of screenings, in particular of metagenomic 22 libraries, is discussed and this idea is validated by the analysis of a model mini-library. 23
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Dates and versions

hal-01849551 , version 1 (05-06-2019)

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Adilya Dagkesamanskaya, Krzysztof Langer, Alexandra Tauzin, Catherine Rouzeau, Delphine Lestrade, et al.. Use of photoswitchable fluorescent proteins for droplet-based microfluidic screening. Journal of Microbiological Methods, 2018, 147, pp.59 - 65. ⟨10.1016/j.mimet.2018.03.001⟩. ⟨hal-01849551⟩
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