Abstract
The CRISPR/Cas9 technology is useful for genome editing to generate targeted mutants. Based on this genome editing technology, it was attempted to generate the rice mutant which lacks JAZ9 activity to understand its function in stress response. The sequence of guide RNA for the recognition of target site was obtained from CRISPR-PLANT website (http://www.genome.arizona.edu/crispr) to minimize off-target effect and was recombined into the CRISPR/Cas9 binary vector pRGEB31. Embryonic calli regenerated from the mature seeds (O. sativa L. cv. Nakdong) were co-cultivated with transformed Agrobacterium tumefaciens LBA4404, and 26 individual transgenic plants were obtained through the hygromycin selection process. Nucleotide sequence analysis showed that most of T0 plants carried both edited and unedited wt sequence of JAZ9, suggesting genetic chimerism of T0 plants. Even though 2 individual lines carried homozygous mutation on JAZ9, they were also chimeric due to biallelic mutation. The relative ratio between edited and unedited wt sequence was variable among individual lines. Expression level of Cas9 is correlated with the frequency of genome editing frequency. In some plants, the enrichment ratio changed along with developmental stage. The nucleotide sequence analysis revealed that Cas9-mediated A/T addition occurred at -3 nucleotide position from protospacer adjacent motif (PAM), whereas G addition at -5 nucleotide position from the PAM. Further analysis of T1 transgenic plants showed that the genome editing patterns were similar between T0 plants and their T1 sibling plants. These suggested that earlier selection of T0 plants with homozygous mutation is an efficient way to obtain homozygous mutants in T1 generation.
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Acknowledgements
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MOE) (NRF-2014R1A1A2054261) and Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ01121501 to Y.D.C.) Rural Development Administration, Republic of Korea, through the National Center for GM Crops.
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Jang, G., Lee, S., Um, T.Y. et al. Genetic chimerism of CRISPR/Cas9-mediated rice mutants. Plant Biotechnol Rep 10, 425–435 (2016). https://doi.org/10.1007/s11816-016-0414-7
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DOI: https://doi.org/10.1007/s11816-016-0414-7