Abstract
Several expression systems have been developed in clustered regularly interspaced short palindromic repeats (CRISPR)-associated protein 9 (CRISPR/Cas9) framework allowing for gene editing of disease-associated genes across diverse citrus varieties. In this study, we present a new approach employing a multi-intron containing Cas9 gene plus multiple gRNAs separated with tRNA sequences to target the phytoene desaturase gene in both ‘Carrizo’ citrange and ‘Duncan’ grapefruit. Notably, using this unified vector significantly boosted editing efficiency in both citrus varieties, showcasing mutations in all three designated targets. The implementation of this multiplex gene editing system with a multi-intron-containing Cas9 plus a gRNA-tRNA array demonstrates a promising avenue for efficient citrus genome editing, equipping us with potent tools in the ongoing battle against several diseases such as canker and huanglongbing.
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Acknowledgements
This research was supported by the USDA/NIFA Emergency Citrus Disease Research and Extension Program.
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ZM, PS, and VO designed experiments. PS, JSV, and VO performed experiments. MZ and ZM constructed binary vector. PS and VO wrote the manuscript. PS, AL, and ZM edited the manuscript. All authors agreed with the content of the manuscript.
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Sarkar, P., Santiago Vazquez, J., Zhou, M. et al. Multiplexed gene editing in citrus by using a multi-intron containing Cas9 gene. Transgenic Res 33, 59–66 (2024). https://doi.org/10.1007/s11248-024-00380-2
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DOI: https://doi.org/10.1007/s11248-024-00380-2