Single-guide RNAs (sgRNAs) targeting the cabbage CENH3 gene were designed using CRISPR RGEN tools (Park et al., 2015 (link)). To clone sgRNAs, primers (Supplementary Table 1) were annealed and ligated into pHSN401 (Addgene #50588) using T4 DNA ligase (NEB) and BsaI-HF (NEB) in a Golden Gate reaction. To confirm correct vector construction, we used Sanger sequencing. All vector construction procedures were performed according to Xing et al. (2014) (link).
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