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Fujimoto S, Matsunaga S. Which Is a Reliable Approach in the Generation of Artificial Minichromosomes, Bottom-Up or Top-Down? CYTOLOGIA 2016. [DOI: 10.1508/cytologia.81.251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Satoru Fujimoto
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science
| | - Sachihiro Matsunaga
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science
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Hou L, Yau YY, Wei J, Han Z, Dong Z, Ow DW. An open-source system for in planta gene stacking by Bxb1 and Cre recombinases. MOLECULAR PLANT 2014; 7:1756-65. [PMID: 25281665 DOI: 10.1093/mp/ssu107] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The rapid development of crops with multiple transgenic traits arouses the need for an efficient system for creating stacked cultivars. Most major crops rely on classical breeding to introgress the transgene from a laboratory variety to the numerous cultivars adapted to different growing regions. Even with vegetative propagated crops, genetic crosses are conducted during varietal improvement prior to vegetative cloning. The probability to assort the 'x' number of transgenic loci into a single genome may seem trivial, (¼) (x) for a diploid species, but given the 'y' number of other nontransgenic traits that breeders also need to assemble into the same genome, the (¼) (x+y) probability for a 'breeding stack' could quickly make the line conversion process unmanageable. Adding new transgenes onto existing transgenic varieties without creating a new segregating locus would require site-specific integration of new DNA at the existing transgenic locus. Here, we tested a recombinase-mediated gene-stacking scheme in tobacco. Sequential site-specific integration was mediated by the mycobacteriophage Bxb1 integrase-catalyzed recombination between attP and attB sites. Transgenic DNA no longer needed after integration was excised by Cre recombinase-mediated recombination of lox sites. Site-specific integration occurred in ~10% of the integration events, with half of those events usable as substrates for a next round of gene stacking. Among the site-specific integrants, however, a third experienced gene silencing. Overall, precise structure and reproducible expression of the sequentially added triple traits were obtained at an overall rate of ~3% of the transformed clones--a workable frequency for the development of commercial cultivars. Moreover, since neither the Bxb1-att nor the Cre-lox system is under patent, there is freedom to operate.
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Affiliation(s)
- Lili Hou
- Plant Gene Engineering Center, South China Agricultural Plant Molecular Analysis and Genetic Improvement Key Laboratory, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Guangzhou 510650, China University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Yuan-Yeu Yau
- Plant Gene Engineering Center, South China Agricultural Plant Molecular Analysis and Genetic Improvement Key Laboratory, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Guangzhou 510650, China Former Affiliation, Plant Gene Expression Center, USDA-ARS & Plant & Microbial Biology, University of California-Berkeley, 800 Buchanan St., Albany, CA 94710, USA
| | - Junjie Wei
- Plant Gene Engineering Center, South China Agricultural Plant Molecular Analysis and Genetic Improvement Key Laboratory, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Guangzhou 510650, China University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Zhiguo Han
- Plant Gene Engineering Center, South China Agricultural Plant Molecular Analysis and Genetic Improvement Key Laboratory, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Guangzhou 510650, China
| | - Zhicheng Dong
- Plant Gene Engineering Center, South China Agricultural Plant Molecular Analysis and Genetic Improvement Key Laboratory, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Guangzhou 510650, China
| | - David W Ow
- Plant Gene Engineering Center, South China Agricultural Plant Molecular Analysis and Genetic Improvement Key Laboratory, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Guangzhou 510650, China Former Affiliation, Plant Gene Expression Center, USDA-ARS & Plant & Microbial Biology, University of California-Berkeley, 800 Buchanan St., Albany, CA 94710, USA
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Abstract
Basic research has provided a much better understanding of the genetic networks and regulatory hierarchies in plants. To meet the challenges of agriculture, we must be able to rapidly translate this knowledge into generating improved plants. Therefore, in this Review, we discuss advanced tools that are currently available for use in plant biotechnology to produce new products in plants and to generate plants with new functions. These tools include synthetic promoters, 'tunable' transcription factors, genome-editing tools and site-specific recombinases. We also review some tools with the potential to enable crop improvement, such as methods for the assembly and synthesis of large DNA molecules, plant transformation with linked multigenes and plant artificial chromosomes. These genetic technologies should be integrated to realize their potential for applications to pressing agricultural and environmental problems.
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