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Issue 21, 2020
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Multi-step processing of single cells using semi-permeable capsules

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Droplet microfluidics technology provides a powerful approach to isolate and process millions of single cells simultaneously. Despite many exciting applications that have emerged based on this technology, workflows based on multi-step operations, including molecular biology and cell-based phenotypic screening assays, cannot be easily adapted to droplet format. Here, we present a microfluidics-based technique to isolate single cells, or biological samples, into semi-permeable hydrogel capsules and perform multi-step biological workflows on thousands to millions of individual cells simultaneously. The biochemical reactions are performed by changing the aqueous buffer surrounding the capsules, without needing sophisticated equipment. The semi-permeable nature of the capsules' shell retains large encapsulated biomolecules (such as genome) while allowing smaller molecules (such as proteins) to passively diffuse. In contrast to conventional hydrogel bead assays, the approach presented here improves bacterial cell retention during multi-step procedures as well as the efficiency of biochemical reactions. We showcase two examples of capsule use for single genome amplification of bacteria, and expansion of individual clones into isogenic microcolonies for later screening for biodegradable plastic production.

Graphical abstract: Multi-step processing of single cells using semi-permeable capsules

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Article information

26 Jun 2020
23 Sep 2020
First published
02 Oct 2020

Lab Chip, 2020,20, 4052-4062
Article type

Multi-step processing of single cells using semi-permeable capsules

G. Leonaviciene, K. Leonavicius, R. Meskys and L. Mazutis, Lab Chip, 2020, 20, 4052
DOI: 10.1039/D0LC00660B

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