One-step CRISPR-Cas9-mediated Knockout of Native TCRαβ Genes in Human T Cells Using RNA Electroporation.

To avoid mispairing between native and introduced T cell receptors (TCRs) and to prevent graft-versus-host disease in allogeneic T cell therapies, TCRα and TCRβ chains of native TCRs are knocked out via CRISPR-Cas9. We demonstrate the isolation and activation of CD8+ T cells followed by electroporation of T cells with in vitro transcribed eSpCas9(1.1)-P2A-EGFP mRNA and single-guide RNAs targeting the TCRα and TCRβ constant regions. We then describe a flow cytometric analysis to determine TCR knockout efficiency.