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High-throughput Multicolor Optogenetics In Microwell Plates

L. J. Bugaj, W. Lim
Published 2019 · Computer Science, Medicine

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Optogenetic probes can be powerful tools for dissecting complexity in cell biology, but there is a lack of instrumentation to exploit their potential for automated, high-information-content experiments. This protocol describes the construction and use of the optoPlate-96, a platform for high-throughput three-color optogenetics experiments that allows simultaneous manipulation of common red- and blue-light-sensitive optogenetic probes. The optoPlate-96 enables illumination of individual wells in 96-well microwell plates or in groups of wells in 384-well plates. Its design ensures that there will be no cross-illumination between microwells in 96-well plates, and an active cooling system minimizes sample heating during light-intensive experiments. This protocol details the steps to assemble, test, and use the optoPlate-96. The device can be fully assembled without specialized equipment beyond a 3D printer and a laser cutter, starting from open-source design files and commercially available components. We then describe how to perform a typical optogenetics experiment using the optoPlate-96 to stimulate adherent mammalian cells. Although optoPlate-96 experiments are compatible with any plate-based readout, we describe analysis using quantitative single-cell immunofluorescence. This workflow thus allows complex optogenetics experiments (independent control of stimulation colors, intensity, dynamics, and time points) with high-dimensional outputs at single-cell resolution. Starting from 3D-printed and laser-cut components, assembly and testing of the optoPlate-96 can be accomplished in 3–4 h, at a cost of ~$600. A full optoPlate-96 experiment with immunofluorescence analysis can be performed within ~24 h, but this estimate is variable depending on the cell type and experimental parameters. A protocol for the assembly and use of the optoPlate-96, a platform for high-throughput three-color optogenetics experiments in microwell plates. With the provided design files, users can assemble the optoPlate-96 from 3D-printed and laser-cut components.
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