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Faber, Gabriel P.; Hauschner, Hagit; Atrash, Mohammad K.; Bilinsky, Liat; Shav‐Tal, Yaron
Cytometry. Part A, August 2023, Volume: 103, Issue: 8Journal Article
Endogenous gene knock‐in using CRIPSR is becoming the standard for fluorescent tagging of endogenous proteins. Some protocols, particularly those that utilize insert cassettes that carry a fluorescent protein tag, can yield many types of cells with off‐target insertions that have diffuse fluorescent signal throughout the whole cell in addition to scarce cells with on‐target gene insertions that show the correct sub‐cellular localization of the tagged protein. As such, when searching for cells with on‐target integration using flow cytometry, the off‐target fluorescent cells yield a high percentage of false positives. Here, we show that by changing the gating used to select for fluorescence during flow cytometry sorting, namely utilizing the width of the signal as opposed to the area, we can highly enrich for positively integrated cells. Reproducible gates were created to select even minuscule percentages of correct subcellular signal, and these parameters were validated by fluorescence microscopy. This method is a powerful tool to rapidly enhance the generation of cell lines with correctly integrated gene knock‐ins encoding endogenous fluorescent proteins.
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