Fig. 1: Identification of KEAP1 as a miR-421 target gene.

a Luciferase constructs containing the KEAP1 3′UTR. b Screening of miRNAs targeting KEAP1 by luciferase reporter assays. c Models of luciferase constructs containing the WT 3′UTR of KEAP1 and del6 (D6) 3′UTR of KEAP1. d HEK293 cells were co-transfected with NC and miR-421 with the WT or Mut 3′UTR. Luciferase activity was assayed 24 h after transient co-transfection. Renilla luciferase activity was measured and normalized to firefly luciferase activity. *P < 0.05 vs miR-421. e The protein level of KEAP1 in A549 cells was analysed by western blotting after transfection with miR-421. f LUADs from The Cancer Genome Atlas (TCGA). Expression values were retrieved from an RNAseq dataset (Illumina HiSeq)