Knockout of RIG-I in HEK293 cells by CRISPR/Cas9.
- Author:
Ziyi CHEN
1
;
Yirong WU
1
;
Yuting ZHANG
1
;
Youling GAO
1
Author Information
- Publication Type:Journal Article
- Keywords: CRISPR/Cas9; HEK293 cell; gene knockout; interferon; retinoic acid-inducible gene I (RIG-I)
- MeSH: Humans; HEK293 Cells; CRISPR-Cas Systems; DEAD Box Protein 58/metabolism*; Signal Transduction; Receptors, Immunologic/metabolism*; Gene Knockout Techniques; Transfection; DEAD-box RNA Helicases/metabolism*; RNA, Guide, CRISPR-Cas Systems/genetics*; Interferon-Induced Helicase, IFIH1/metabolism*; Transcription Factor RelA/metabolism*; Interferon-beta/metabolism*
- From: Chinese Journal of Biotechnology 2024;40(11):4254-4265
- CountryChina
- Language:Chinese
- Abstract: We knocked out the retinoic acid-inducible gene I (RIG-I) in HEK293 cells via CRISPR/Cas9 to reveal the effects of RIG-I knockout on the key factors in the type I interferon signaling pathway. Three single guide RNAs (sgRNAs) targeting RIG-I were designed, and the recombination vectors were constructed on the basis of the pX459 vector and used to transfect HEK293 cells, which were screened by puromycin subsequently. Furthermore, a mimic of virus, poly I: C, was used to transfect the cells screened out. RIG-I knockout was checked by sequencing, real-time quantitative PCR, Western blotting, and immunofluorescence assay. Meanwhile, the expression levels of key factors of type I interferon signaling pathway such as melanoma differentiation-associated gene 5 (MDA5), interferonβ1 (IFNβ1), and nuclear factor-kappa B p65 [NF-κB(p65)], as well as cell viability, were determined. The results showed that two HEK293 cell lines (S1 and S3) with RIG-I knockout were obtained, which exhibited lower mRNA and protein levels of RIG-I than the wild type HEK293 cells (P < 0.05). The mRNA levels of MDA5 and IFNβ1 in S1 and S3 cells and the protein level of NF-κB(p65) in S3 cells were lower than those in the wild type (P < 0.05). More extranuclear NF-κB(p65) protein was detected in S1 cells than in the wild type after transfection with poly I: C. Plus, the wild-type and S1 cells transfected with poly I: C for 48 h showcased reduced viability (P < 0.05), while S3 cells did not display the reduction in cell viability. In summary, the present study obtained two HEK293 cell lines with RIG-I knockout via CRISPR/Cas9, which provided a stable cell model for exploring the mechanism of type I interferon signaling pathway.
