Genome editing of 30 UTR-embedded inhibitory region enables generation of gene knock-up alleles in plants

Dear Editor,Genome editing has revolutionized speed breeding by enabling researchers to alter the genome directly as desired(Gao,2021).The most widely used CRISPR–Cas9 technology has mainly been applied to engineer null mutations in coding sequences,with the goal of creating loss-of-function alleles.Recently,upstream regulatory elements of the promoter region and 50 upstream open reading frame(uORF)have been engineered to generate gain-of-function alleles,producing versatile cis-regulatory effects,usually through changes in gene expression levels(Rodrıguez-Leal et al.,2017;Zhang et al.,2018;Song et al.,2022).