CRISPR RNAs trigger innate immune responses in human cells.

Abstract:

:Here, we report that CRISPR guide RNAs (gRNAs) with a 5'-triphosphate group (5'-ppp gRNAs) produced via in vitro transcription trigger RNA-sensing innate immune responses in human and murine cells, leading to cytotoxicity. 5'-ppp gRNAs in the cytosol are recognized by DDX58, which in turn activates type I interferon responses, causing up to ∼80% cell death. We show that the triphosphate group can be removed by a phosphatase in vitro and that the resulting 5'-hydroxyl gRNAs in complex with Cas9 or Cpf1 avoid innate immune responses and can achieve targeted mutagenesis at a frequency of 95% in primary human CD4+ T cells. These results are in line with previous findings that chemically synthesized sgRNAs with a 5'-hydroxyl group are much more efficient than in vitro-transcribed (IVT) sgRNAs in human and other mammalian cells. The phosphatase treatment of IVT sgRNAs is a cost-effective method for making highly active sgRNAs, avoiding innate immune responses in human cells.

journal_name

Genome Res

journal_title

Genome research

authors

Kim S,Koo T,Jee HG,Cho HY,Lee G,Lim DG,Shin HS,Kim JS

doi

10.1101/gr.231936.117

subject

Has Abstract

pub_date

2018-02-22 00:00:00

eissn

1088-9051

issn

1549-5469

pii

gr.231936.117

pub_type

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