- Author:
Zhiyin ZHOU
1
;
Xiaomei LÜ
1
;
Li ZHU
1
;
Ji ZHOU
2
;
Huidan HUANG
1
;
Chao ZHANG
1
;
Xiaoping LIU
1
Author Information
- Publication Type:Journal Article
- Keywords: CRISPR/Cas9; TrxR1; gene knockout; stable cell line
- MeSH: CRISPR-Cas Systems/genetics*; Gene Editing; Gene Knockout Techniques; HCT116 Cells; Humans; RNA, Guide/metabolism*
- From: Chinese Journal of Biotechnology 2022;38(3):1074-1085
- CountryChina
- Language:Chinese
- Abstract: To investigate the cellular target selectivity of small molecules targeting thioredoxin reductase 1, we reported the construction and functional research of a stable TrxR1 gene (encode thioredoxin reductase 1) knockout HCT-116 cell line. We designed and selected TrxR1 knockout sites according to the TrxR1 gene sequence and CRISPR/Cas9 target designing principles. SgRNA oligos based on the selected TrxR1 knockout sites were obtained. Next, we constructed knockout plasmid by cloning the sgRNA into the pCasCMV-Puro-U6 vector. After transfection of the plasmid into HCT-116 cells, TrxR1 knockout HCT-116 cells were selected using puromycin resistance. The TrxR1 knockout efficiency was identified and verified by DNA sequencing, immunoblotting, TRFS-green fluorescent probe, and cellular TrxR1 enzyme activity detection. Finally, the correlation between TrxR1 expression and cellular effects of drugs specifically targeting TrxR1 was investigated by CCK-8 assay. The results demonstrated that the knockout plasmid expressing the sgRNA effectively knocked-out TrxR1 gene within HCT-116 cells, and no expression of TrxR1 protein could be observed in stable TrxR1 knockout HCT-116 (HCT116-TrxR1-KO) cells. The TrxR1-targeting inhibitor auranofin did not show any inhibitory activity against either cellular TrxR1 enzyme activity or cell proliferation. Based on these results, we conclude that a stable TrxR1 gene knockout HCT-116 cell line was obtained through CRISPR/Cas9 techniques, which may facilitate investigating the role of TrxR1 in various diseases.