PT - JOURNAL ARTICLE AU - Vertti-Quintero, Nadia AU - Levien, Ethan AU - Poggi, Lucie AU - Amir, Ariel AU - Richard, Guy-Franck AU - Baroud, Charles N. TI - Single-cell microfluidic analysis unravels individual cellular fates during Double-Strand Break Repair AID - 10.1101/2022.03.10.483811 DP - 2022 Jan 01 TA - bioRxiv PG - 2022.03.10.483811 4099 - http://biorxiv.org/content/early/2022/03/12/2022.03.10.483811.short 4100 - http://biorxiv.org/content/early/2022/03/12/2022.03.10.483811.full AB - Trinucleotide repeat expansions are responsible for two dozen human disorders. Contracting expanded repeats by Double-Strand Break Repair (DSBR) might be a therapeutic approach. Given the complexity of manipulating human cells, recent assays were made to quantify DSBR efficacy in yeast, using a fluorescent reporter. In this study DSBR is characterized with an interdisciplinary approach, linking large population dynamics and individual cells. Time-resolved molecular measurements of changes in the population are first confronted to a coupled differential equation model to obtain repair processes rates. Comparisons with measurements in microfluidic devices, where the progeny of 80-150 individual cells are followed, show good agreement between individual trajectories and mathematical and molecular results. Further analysis of individual progenies shows the heterogeneity of individual cell contributions to global repair efficacy. Three different categories of repair are identified: high-efficacy error-free, low-efficacy error-free and low-efficacy error-prone. These categories depend on the type of endonuclease used and on the target sequence.Competing Interest StatementThe authors have declared no competing interest.