In vitro-transcribed guide RNAs trigger an innate immune response via the RIG-I pathway

PLoS Biology
Beeke WienertJacob E Corn

Abstract

Clustered, regularly interspaced, short palindromic repeat (CRISPR)-CRISPR-associated 9 (Cas9) genome editing is revolutionizing fundamental research and has great potential for the treatment of many diseases. While editing of immortalized cell lines has become relatively easy, editing of therapeutically relevant primary cells and tissues can remain challenging. One recent advancement is the delivery of a Cas9 protein and an in vitro-transcribed (IVT) guide RNA (gRNA) as a precomplexed ribonucleoprotein (RNP). This approach allows editing of primary cells such as T cells and hematopoietic stem cells, but the consequences beyond genome editing of introducing foreign Cas9 RNPs into mammalian cells are not fully understood. Here, we show that the IVT gRNAs commonly used by many laboratories for RNP editing trigger a potent innate immune response that is similar to canonical immune-stimulating ligands. IVT gRNAs are recognized in the cytosol through the retinoic acid-inducible gene I (RIG-I) pathway but not the melanoma differentiation-associated gene 5 (MDA5) pathway, thereby triggering a type I interferon response. Removal of the 5'-triphosphate from gRNAs ameliorates inflammatory signaling and prevents the loss of viability asso...Continue Reading

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Methods Mentioned

BETA
transfection
PCR
in vitro transcription
size exclusion
size exclusion chromatography
transfections
fluorescence-activated cell sorting
electrophoresis
amplicon sequencing

Software Mentioned

CRISPResso
Vienna RNA Fold
NEEDLE
Synthego

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