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Xu C, Birchler JA. Editorial: Plant artificial chromosomes: progress and perspectives. FRONTIERS IN PLANT SCIENCE 2023; 14:1290386. [PMID: 37822343 PMCID: PMC10562729 DOI: 10.3389/fpls.2023.1290386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 09/14/2023] [Indexed: 10/13/2023]
Affiliation(s)
- Chunhui Xu
- Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Sciences, Shandong University, Qingdao, China
| | - James A. Birchler
- Division of Biological Sciences, University of Missouri at Columbia, Columbia, MO, United States
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Li R, Han Z, Yin Q, Li M, Zhang M, Li Z, Wang P, Jiang L, Ow DW. Target Lines for in Planta Gene Stacking in Japonica Rice. Int J Mol Sci 2022; 23:ijms23169385. [PMID: 36012650 PMCID: PMC9409015 DOI: 10.3390/ijms23169385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/11/2022] [Accepted: 08/11/2022] [Indexed: 12/02/2022] Open
Abstract
The clustering of transgenes at a chromosome location minimizes the number of segregating loci that needs to be introgressed to field cultivars. Transgenes could be efficiently stacked through site-specific recombination and a recombinase-mediated in planta gene stacking process was described previously in tobacco based on the Mycobacteriophage Bxb1 site-specific integration system. Since this process requires a recombination site in the genome, this work describes the generation of target sites in the Japonica rice genome. Agrobacterium-mediated gene transfer yielded ~4000 random-insertion lines. Seven lines met the criteria of being single copy, not close to a centromere, not inserted within or close to a known gene or repetitive DNA, having precise recombination site sequences on both ends, and able to express the reporter gene. Each target line tested was able to accept the site-specific integration of a new gfp-containing plasmid and in three of those lines, we regenerated fertile plants. These target lines could be used as foundation lines for stacking new traits into Japonica rice.
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Affiliation(s)
- Ruyu Li
- Plant Gene Engineering Center, Chinese Academy of Sciences, Guangzhou 510650, China
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
- Correspondence: (R.L.); (D.W.O.)
| | - Zhiguo Han
- Plant Gene Engineering Center, Chinese Academy of Sciences, Guangzhou 510650, China
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Qian Yin
- Plant Gene Engineering Center, Chinese Academy of Sciences, Guangzhou 510650, China
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Meiru Li
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Mingyong Zhang
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Zhenzhen Li
- Plant Gene Engineering Center, Chinese Academy of Sciences, Guangzhou 510650, China
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Ping Wang
- Plant Gene Engineering Center, Chinese Academy of Sciences, Guangzhou 510650, China
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Li Jiang
- Plant Gene Engineering Center, Chinese Academy of Sciences, Guangzhou 510650, China
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - David W. Ow
- Plant Gene Engineering Center, Chinese Academy of Sciences, Guangzhou 510650, China
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
- Correspondence: (R.L.); (D.W.O.)
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Yin Q, Li R, Ow DW. Split-Cre mediated deletion of DNA no longer needed after site-specific integration in rice. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2022; 135:2333-2340. [PMID: 35596798 DOI: 10.1007/s00122-022-04115-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 04/25/2022] [Indexed: 06/15/2023]
Abstract
N-cre and C-cre added in separate lines reassemble functional Cre in F1 progeny to excise unnecessary DNA, including cre DNA, thereby eliminating generations needed to cross in and out cre. Crop improvement via transgenesis can benefit through efficient DNA integration strategies. As new traits are developed, new transgenes can be stacked by in planta site-specific integration near previous transgenes, thereby facilitating their introgression to field cultivars as a single segregation locus. However, as each round of integration often requires use of selectable markers, it is more convenient to reuse the selection scheme. The Cre recombinase can be used to delete away previously used selection genes, and other DNA no longer needed after transformation, but the constitutive production of this DNA scanning protein can also affect plant growth. We had previously described in Arabidopsis a split Cre protein fragment complement scheme to reassemble a functional Cre recombinase. As our goal for developing this system was to deploy its use in major crop plants, here we show that Cre protein fragment complementation works in rice with precise recombination structures confirmed by DNA sequencing. As each N-terminal and C-terminal fragment is also flanked by lox recombination sites, they can also self-excise to avoid the need to segregate away the cre DNA. Options to form F1 hybrids homozygous for one transgene, or hemizygous for two different transgenes at the same chromosome location, are discussed.
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Affiliation(s)
- Qian Yin
- Plant Gene Engineering Center, Chinese Academy of Sciences Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Guangdong Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ruyu Li
- Plant Gene Engineering Center, Chinese Academy of Sciences Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Guangdong Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China.
| | - David W Ow
- Plant Gene Engineering Center, Chinese Academy of Sciences Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Guangdong Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China.
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