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Yanagawa Y, Takeuchi K, Endo M, Furutani A, Ochiai H, Toki S, Mitsuhara I. I- SceI Endonuclease-Mediated Plant Genome Editing by Protein Transport through a Bacterial Type III Secretion System. PLANTS 2020; 9:plants9091070. [PMID: 32825459 PMCID: PMC7570400 DOI: 10.3390/plants9091070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 08/13/2020] [Accepted: 08/18/2020] [Indexed: 12/24/2022]
Abstract
Xanthomonas campestris is one of bacteria carrying a type III secretion system which transports their effector proteins into host plant cells to disturb host defense system for their infection. To establish a genome editing system without introducing any foreign gene, we attempted to introduce genome editing enzymes through the type III secretion system. In a test of protein transfer, X. campestris pv. campestris (Xcc) transported a considerable amount of a reporter protein sGFP-CyaA into tobacco plant cells under the control of the type III secretion system while maintaining cell viability. For proof of concept for genome editing, we used a reporter tobacco plant containing a luciferase (LUC) gene interrupted by a meganuclease I-SceI recognition sequence; this plant exhibits chemiluminescence of LUC only when a frameshift mutation is introduced at the I-SceI recognition site. Luciferase signal was observed in tobacco leaves infected by Xcc carrying an I-SceI gene which secretes I-SceI protein through the type III system, but not leaves infected by Xcc carrying a vector control. Genome-edited tobacco plant could be regenerated from a piece of infected leaf piece by repeated selection of LUC positive calli. Sequence analysis revealed that the regenerated tobacco plant possessed a base deletion in the I-SceI recognition sequence that activated the LUC gene, indicating genome editing by I-SceI protein transferred through the type III secretion system of Xcc.
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Affiliation(s)
- Yuki Yanagawa
- Institute of Agrobiological Sciences, NARO, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan; (Y.Y.); (K.T.); (M.E.); (H.O.); (S.T.)
| | - Kasumi Takeuchi
- Institute of Agrobiological Sciences, NARO, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan; (Y.Y.); (K.T.); (M.E.); (H.O.); (S.T.)
| | - Masaki Endo
- Institute of Agrobiological Sciences, NARO, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan; (Y.Y.); (K.T.); (M.E.); (H.O.); (S.T.)
| | - Ayako Furutani
- Gene Research Center, Ibaraki University, 3-21-1 Ami, Inashiki, Ibaraki 300-0393, Japan;
| | - Hirokazu Ochiai
- Institute of Agrobiological Sciences, NARO, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan; (Y.Y.); (K.T.); (M.E.); (H.O.); (S.T.)
| | - Seiichi Toki
- Institute of Agrobiological Sciences, NARO, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan; (Y.Y.); (K.T.); (M.E.); (H.O.); (S.T.)
| | - Ichiro Mitsuhara
- Institute of Agrobiological Sciences, NARO, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan; (Y.Y.); (K.T.); (M.E.); (H.O.); (S.T.)
- Correspondence: ; Tel.: +81-29-838-7440
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