Abstract
To develop an effective genome editing tool for blueberry breeding, CRISPR-Cas9 and CRISPR-Cas12a were evaluated for their editing efficiencies of a marker gene, beta-glucuronidase (gusA), which was previously introduced into two blueberry cultivars each a single-copy transgene. Four expression vectors were built, with CRISPR-Cas9 and CRISPR-Cas12a each driven by a 35S promoter or AtUbi promoter. Each vector contained two editing sites in the gusA. These four vectors were respectively transformed into the leaf explants of transgenic gusA blueberry and the resulting transgenic calli were induced under hygromycin selection. GUS staining showed that some small proportions of the hygromycin-resistant calli had non-GUS stained sectors, suggesting some possible occurrences of gusA editing. We sequenced GUS amplicons spanning the two editing sites in three blueberry tissues and found about 5.5% amplicons having editing features from the calli transformed with the 35S-Cas9 vector. Further, we conducted a second round of shoot regeneration from leaf explants derived from the initial Cas9- and Cas12a-containing calli (T0) and analyzed amplicons of the target editing region. Of the newly induced shoots, 15.5% for the 35S-Cas9 and 5.3% for the AtUbi-Cas9 showed non-GUS staining, whereas all of the shoots containing the Cas12a vectors showed blue staining. Sanger sequencing confirmed the editing-induced mutations in two representative non-GUS staining lines. Clearly, the second round of regeneration had enriched editing events and enhanced the production of edited shoots. The results and protocol described will be helpful to facilitating high-precision breeding of blueberries using CRISPR Cas technologies.
Key Message
A second round of regeneration enriched editing events and enhanced the production of edited blueberry shoots. The new protocol described facilitates high-precision breeding of blueberries using CRISPR Cas technologies.
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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Funding
This research was supported in part by the agreement of Non-Assistance Cooperative Agreement #58-8060-6-009 between the USDA Agricultural Research Service and Michigan State University. Dr. Xiaoyan Han’s visit at Michigan State University was partially supported by a CAS Scholarship. Dr. Emadeldin A. H. Ahmed is a Fulbright fellow at Michigan State University.
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GS and GZ conceived and supervised the research. YY, XYH, XH, JR, EA, and GS conducted the experiments. YY, XYH, and YQ analyzed the data. GS, XYH, YY, YQ, and GZ wrote the manuscript. All authors reviewed and approved the final manuscript.
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Han, X., Yang, Y., Han, X. et al. CRISPR Cas9- and Cas12a-mediated gusA editing in transgenic blueberry. Plant Cell Tiss Organ Cult 148, 217–229 (2022). https://doi.org/10.1007/s11240-021-02177-1
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DOI: https://doi.org/10.1007/s11240-021-02177-1