Isolation of gene-edited cells via knock-in of short glycophosphatidylinositol-anchored epitope tags

Scientific Reports
Anastasia ZotovaDmitriy Mazurov

Abstract

We describe Surface Oligopeptide knock-in for Rapid Target Selection (SORTS), a novel method to select mammalian cells with precise genome modifications that does not rely on cell cloning. SORTS is designed to disrupt the target gene with an expression cassette encoding an epitope tag embedded into human glycophosphatidylinositol (GPI)-anchored protein CD52. The cassette is very short, usually less than 250 nucleotides, which simplifies donor DNA construction and facilitates transgene integration into the target locus. The chimeric protein is then expressed from the target promoter, processed and exposed on the plasma membrane where it serves as a marker for FACS sorting with tag-specific antibodies. Simultaneous use of two different epitope tags enables rapid isolation of cells with biallelic knock-ins. SORTS can be easily and reliably applied to a number of genome-editing problems such as knocking out genes encoding intracellular or secreted proteins, protein tagging and inactivation of HIV-1 provirus.

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Methods Mentioned

BETA
PCR
flow cytometry
flow
transfection
ELISA
FACS
transfections
FCS

Software Mentioned

Autoquant X3
Surveyor
Addgene
cellSens Dimention
CytExpert
cellSens Dimension
SORTS
FlowJo
Olympus

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