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Singh R, Kaur N, Praba UP, Kaur G, Tanin MJ, Kumar P, Neelam K, Sandhu JS, Vikal Y. A Prospective Review on Selectable Marker-Free Genome Engineered Rice: Past, Present and Future Scientific Realm. Front Genet 2022; 13:882836. [PMID: 35754795 PMCID: PMC9219106 DOI: 10.3389/fgene.2022.882836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 04/29/2022] [Indexed: 11/13/2022] Open
Abstract
As a staple food crop, rice has gained mainstream attention in genome engineering for its genetic improvement. Genome engineering technologies such as transgenic and genome editing have enabled the significant improvement of target traits in relation to various biotic and abiotic aspects as well as nutrition, for which genetic diversity is lacking. In comparison to conventional breeding, genome engineering techniques are more precise and less time-consuming. However, one of the major issues with biotech rice commercialization is the utilization of selectable marker genes (SMGs) in the vector construct, which when incorporated into the genome are considered to pose risks to human health, the environment, and biodiversity, and thus become a matter of regulation. Various conventional strategies (co-transformation, transposon, recombinase systems, and MAT-vector) have been used in rice to avoid or remove the SMG from the developed events. However, the major limitations of these methods are; time-consuming, leftover cryptic sequences in the genome, and there is variable frequency. In contrast to these methods, CRISPR/Cas9-based marker excision, marker-free targeted gene insertion, programmed self-elimination, and RNP-based delivery enable us to generate marker-free engineered rice plants precisely and in less time. Although the CRISPR/Cas9-based SMG-free approaches are in their early stages, further research and their utilization in rice could help to break the regulatory barrier in its commercialization. In the current review, we have discussed the limitations of traditional methods followed by advanced techniques. We have also proposed a hypothesis, “DNA-free marker-less transformation” to overcome the regulatory barriers posed by SMGs.
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Affiliation(s)
- Rajveer Singh
- School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
| | - Navneet Kaur
- School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
| | - Umesh Preethi Praba
- School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
| | - Gurwinder Kaur
- School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
| | - Mohammad Jafar Tanin
- Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, India
| | - Pankaj Kumar
- School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
| | - Kumari Neelam
- School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
| | - Jagdeep Singh Sandhu
- School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
| | - Yogesh Vikal
- School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India
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Impacts of environmental conditions, and allelic variation of cytosolic glutamine synthetase on maize hybrid kernel production. Commun Biol 2021; 4:1095. [PMID: 34535763 PMCID: PMC8448750 DOI: 10.1038/s42003-021-02598-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 08/24/2021] [Indexed: 11/19/2022] Open
Abstract
Cytosolic glutamine synthetase (GS1) is the enzyme mainly responsible of ammonium assimilation and reassimilation in maize leaves. The agronomic potential of GS1 in maize kernel production was investigated by examining the impact of an overexpression of the enzyme in the leaf cells. Transgenic hybrids exhibiting a three-fold increase in leaf GS activity were produced and characterized using plants grown in the field. Several independent hybrids overexpressing Gln1-3, a gene encoding cytosolic (GS1), in the leaf and bundle sheath mesophyll cells were grown over five years in different locations. On average, a 3.8% increase in kernel yield was obtained in the transgenic hybrids compared to controls. However, we observed that such an increase was simultaneously dependent upon both the environmental conditions and the transgenic event for a given field trial. Although variable from one environment to another, significant associations were also found between two GS1 genes (Gln1-3 and Gln1-4) polymorphic regions and kernel yield in different locations. We propose that the GS1 enzyme is a potential lead for producing high yielding maize hybrids using either genetic engineering or marker-assisted selection. However, for these hybrids, yield increases will be largely dependent upon the environmental conditions used to grow the plants. Amiour et al. use a multi-year field trial evaluation and association mapping to determine if increased enzyme activity and native allelic variations at the GS1 loci in maize contribute to differences in grain yield. Overexpression of GS1 and polymorphisms in the corresponding loci were associated with kernel yield, indicating that GS1 expression can directly control kernel production and that GS1 has a potential lead in the production of high yielding maize hybrids depending on environmental conditions.
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Yang C, Ge J, Fu X, Luo K, Xu C. Dual Reproductive Cell-Specific Promoter-Mediated Split-Cre/LoxP System Suitable for Exogenous Gene Deletion in Hybrid Progeny of Transgenic Arabidopsis. Int J Mol Sci 2021; 22:5080. [PMID: 34064885 PMCID: PMC8151399 DOI: 10.3390/ijms22105080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/07/2021] [Accepted: 05/10/2021] [Indexed: 01/02/2023] Open
Abstract
Genetically modified (GM) crops possess some superior characteristics, such as high yield and insect resistance, but their biosafety has aroused broad public concern. Some genetic engineering technologies have recently been proposed to remove exogenous genes from GM crops. Few approaches have been applied to maintain advantageous traits, but excising exogenous genes in seeds or fruits from these hybrid crops has led to the generation of harvested food without exogenous genes. In a previous study, split-Cre mediated by split intein could recombine its structure and restore recombination activity in hybrid plants. In the current study, the recombination efficiency of split-Cre under the control of ovule-specific or pollen-specific promoters was validated by hybridization of transgenic Arabidopsis containing the improved expression vectors. In these vectors, all exogenous genes were flanked by two loxP sites, including promoters, resistance genes, reporter genes, and split-Cre genes linked to the reporter genes via LP4/2A. A gene deletion system was designed in which NCre was driven by proDD45, and CCre was driven by proACA9 and proDLL. Transgenic lines containing NCre were used as paternal lines to hybridize with transgenic lines containing CCre. Because this hybridization method results in no co-expression of the NCre and CCre genes controlled by reproduction-specific promoters in the F1 progeny, the desirable characteristics could be retained. After self-crossing in F1 progeny, the expression level and protein activity of reporter genes were detected, and confirmed that recombination of split-Cre had occurred and the exogenous genes were partially deleted. The gene deletion efficiency represented by the quantitative measurements of GUS enzyme activity was over 59%, with the highest efficiency of 73% among variable hybrid combinations. Thus, in the present study a novel dual reproductive cell-specific promoter-mediated gene deletion system was developed that has the potential to take advantage of the merits of GM crops while alleviating biosafety concerns.
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Affiliation(s)
| | | | | | - Keming Luo
- Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, Key Laboratory of Eco-Environments of Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Chongqing 400715, China; (C.Y.); (J.G.); (X.F.)
| | - Changzheng Xu
- Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, Key Laboratory of Eco-Environments of Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Chongqing 400715, China; (C.Y.); (J.G.); (X.F.)
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Salava H, Thula S, Mohan V, Kumar R, Maghuly F. Application of Genome Editing in Tomato Breeding: Mechanisms, Advances, and Prospects. Int J Mol Sci 2021; 22:E682. [PMID: 33445555 PMCID: PMC7827871 DOI: 10.3390/ijms22020682] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 12/31/2020] [Accepted: 01/05/2021] [Indexed: 12/19/2022] Open
Abstract
Plants regularly face the changing climatic conditions that cause biotic and abiotic stress responses. The abiotic stresses are the primary constraints affecting crop yield and nutritional quality in many crop plants. The advances in genome sequencing and high-throughput approaches have enabled the researchers to use genome editing tools for the functional characterization of many genes useful for crop improvement. The present review focuses on the genome editing tools for improving many traits such as disease resistance, abiotic stress tolerance, yield, quality, and nutritional aspects of tomato. Many candidate genes conferring tolerance to abiotic stresses such as heat, cold, drought, and salinity stress have been successfully manipulated by gene modification and editing techniques such as RNA interference, insertional mutagenesis, and clustered regularly interspaced short palindromic repeat (CRISPR/Cas9). In this regard, the genome editing tools such as CRISPR/Cas9, which is a fast and efficient technology that can be exploited to explore the genetic resources for the improvement of tomato and other crop plants in terms of stress tolerance and nutritional quality. The review presents examples of gene editing responsible for conferring both biotic and abiotic stresses in tomato simultaneously. The literature on using this powerful technology to improve fruit quality, yield, and nutritional aspects in tomato is highlighted. Finally, the prospects and challenges of genome editing, public and political acceptance in tomato are discussed.
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Affiliation(s)
- Hymavathi Salava
- Department of Plant Sciences, University of Hyderabad, Hyderabad 500064, India;
| | - Sravankumar Thula
- Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, CZ-625 00 Brno, Czech Republic;
| | - Vijee Mohan
- Department of Biological Sciences, University of North Texas, Denton, TX 76203, USA;
| | - Rahul Kumar
- Plant Translational Research Laboratory, Department of Plant Sciences, University of Hyderabad, Hyderabad 500064, India;
| | - Fatemeh Maghuly
- Plant Functional Genomics, Institute of Molecular Biotechnology, Department of Biotechnology, BOKU-VIBT, University of Natural Resources and Life Sciences, 1190 Vienna, Austria
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Chen Y, Lange A, Vaghchhipawala Z, Ye X, Saltarikos A. Direct Germline Transformation of Cotton Meristem Explants With No Selection. FRONTIERS IN PLANT SCIENCE 2020; 11:575283. [PMID: 33072151 PMCID: PMC7543975 DOI: 10.3389/fpls.2020.575283] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 09/04/2020] [Indexed: 05/27/2023]
Abstract
Regeneration of transgenic plants without selectable markers can facilitate the development and commercialization of trait stacking products. A wide range of strategies have been developed to eliminate selectable markers to produce marker-free transgenic plants. The most widely used marker free approach is probably the Agrobacterium-based 2 T-DNA strategy where the gene-of-interest (GOI) and selectable marker gene are delivered from independent T-DNAs (Darbani et al., 2007). The selectable marker gene is segregated away from the GOI in subsequent generations. However, the efficiency of this 2 T-DNA system is much less than the traditional 1 T-DNA system due to the inefficiency of T-DNA co-transformation and high rate of con-integration between the GOI and selectable marker gene T-DNAs. In contrast, no selection transformation utilizes a single T-DNA carrying the GOI and thus eliminates the need to remove the selectable marker insert and potentially provides a viable alternative marker-free system. In this study, we reported the successful regeneration of transgenic cotton plants through Agrobacterium inoculation of seed meristem explants without the use of selective agents. Regeneration of putative transgenic plants were identified by GUS histo-chemical assay. The germline transmission of transgene to progeny was determined by segregation of pollen grains, immature embryos and T1 plants by GUS expression. The results were further confirmed by Southern analyses. The marker-free transformation frequency in this no selection system was similar to current meristem transformation system with selection (0.2%-0.7%). The strategy for further improvement of this system and its implication in improving cotton transformation pipeline and in developing transgene-free genome editing technology is discussed.
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Liu F, Wang P, Xiong X, Fu P, Gao H, Ding X, Wu G. Comparison of three Agrobacterium-mediated co-transformation methods for generating marker-free transgenic Brassica napus plants. PLANT METHODS 2020; 16:81. [PMID: 32518583 PMCID: PMC7275470 DOI: 10.1186/s13007-020-00628-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Accepted: 06/01/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Generation of marker-free transgenic plants is very important to the regulatory permission and commercial release of transgenic crops. Co-transformation methods that enable the removal of selectable marker genes have been extensively used because they are simple and clean. Few comparisons are currently available between different strain/plasmid co-transformation systems, and also data are related to variation in co-transformation frequencies caused by other details of the vector design. RESULTS In this study, we constructed three vector systems for the co-transformation of allotetraploid Brassica napus (B. napus) mediated by Agrobacterium tumefaciens and compared these co-transformation methods. We tested a mixed-strain system, in which a single T-DNA is harbored in two plasmids, as well as two "double T-DNA" vector systems, in which two independent T-DNAs are harbored in one plasmid in a tandem orientation or in an inverted orientation. As confirmed by the use of PCR analysis, test strips, and Southern blot, the average co-transformation frequencies from these systems ranged from 24 to 81% in T0 plants, with the highest frequency of 81% for 1:1 treatment of the mixed-strain system. These vector systems are valuable for generating marker-free transgenic B. napus plants, and marker-free plants were successfully obtained in the T1 generation from 50 to 77% of T0 transgenic lines using these systems, with the highest frequency of 77% for "double T-DNA" vector systems of pBID RT Enhanced. We further found that marker-free B. napus plants were more frequently encountered in the progeny of transgenic lines which has only one or two marker gene copies in the T0 generation. Two types of herbicide resistant transgenic B. napus plants, Bar + with phosphinothricin resistance and Bar + EPSPS + GOX + with phosphinothricin and glyphosate resistance, were obtained. CONCLUSION We were successful in removing selectable marker genes in transgenic B. napus plants using all three co-transformation systems developed in this study. It was proved that if a appropriate mole ratio was designed for the specific length ratio of the twin T-DNAs for the mixed-strain method, high unlinked co-insertion frequency and overall success frequency could be achieved. Our study provides useful information for the construction of efficient co-transformation system for marker-free transgenic crop production and developed transgenic B. napus with various types of herbicide resistance.
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Affiliation(s)
- Fang Liu
- Key Laboratory of Biology and Genetics Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, China
| | - Pandi Wang
- Key Laboratory of Biology and Genetics Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, China
| | - Xiaojuan Xiong
- Key Laboratory of Biology and Genetics Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, China
| | - Ping Fu
- Key Laboratory of Biology and Genetics Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, China
| | - Hongfei Gao
- Key Laboratory of Biology and Genetics Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, China
| | - Xinhua Ding
- State Key Laboratory of Crop Biology, College of Plant Protection, Shandong Agricultural University, Tai’an, 271018 Shandong China
| | - Gang Wu
- Key Laboratory of Biology and Genetics Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, China
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Timerbaev V, Mitiouchkina T, Pushin A, Dolgov S. Production of Marker-Free Apple Plants Expressing the Supersweet Protein Gene Driven by Plant Promoter. FRONTIERS IN PLANT SCIENCE 2019; 10:388. [PMID: 30984230 PMCID: PMC6449483 DOI: 10.3389/fpls.2019.00388] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 03/13/2019] [Indexed: 05/30/2023]
Abstract
The presence of antibiotic resistance and other marker genes in genetically modified plants causes concern in society because of perceived risks for the environment and human health. The creation of transgenic plants that do not contain foreign genetic material, especially that of bacterial and viral origin, largely alleviates the tension and makes the plants potentially more attractive for consumers. To produce marker-free transgenic apple plants, we used the pMF1 vector, which combines Zygosaccharomyces rouxii recombinaseR and a CodA-nptII bifunctional selectable gene. The thaumatin II gene from the tropical plant Thaumatococcus daniellii, which is under the control of the plant E8 gene (a predominantly fruit-specific promoter) and rbsS3A terminator, was taken as the gene of interest for modification of the fruit taste and enhancing its sweetness. Exploitation of this gene in our laboratory has allowed enhancing the sweetness, as well as improving the taste characteristics, of fruits and vegetables of plants such as strawberry, carrot, tomato and pear. We have obtained three independent transgenic apple lines that have been analyzed by PCR and Southern blot analyses for the presence of T-DNA sequences. Two of them contained a partial sequence of the T-DNA. With one line containing the full insert we then used a delayed strategy for the selection of marker-free plants. After induction of recombinase activity in leaf explants on selective media with 5-fluorocytosine (5-FC) we obtained more than 30 sublines, most of which lost their resistance to kanamycin. Most of the apple sublines showed the expression of the supersweet protein gene in a wide range of levels as detected by RNA accumulation. The plants from the group with the highest transcript level were propagated and grafted onto dwarf rootstocks for early fruit production for future estimates of protein levels and organoleptic analyses. Thus, we developed a protocol that allowed the production of marker-free apple plants expressing the supersweet protein.
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Affiliation(s)
- Vadim Timerbaev
- Laboratory of Expression Systems and Modification of the Plant Genome “Biotron”, Branch of the Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Pushchino, Russia
- Laboratory of Plant Bioengineering, Nikita Botanical Gardens – National Scientific Center, Russian Academy of Sciences, Yalta, Russia
- Laboratory of Plant Genetic Engineering, All-Russia Research Institute of Agricultural Biotechnology, Russian Academy of Sciences, Moscow, Russia
| | - Tatiana Mitiouchkina
- Laboratory of Expression Systems and Modification of the Plant Genome “Biotron”, Branch of the Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Pushchino, Russia
- Laboratory of Plant Bioengineering, Nikita Botanical Gardens – National Scientific Center, Russian Academy of Sciences, Yalta, Russia
- Laboratory of Plant Genetic Engineering, All-Russia Research Institute of Agricultural Biotechnology, Russian Academy of Sciences, Moscow, Russia
| | - Alexander Pushin
- Laboratory of Expression Systems and Modification of the Plant Genome “Biotron”, Branch of the Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Pushchino, Russia
- Laboratory of Plant Genetic Engineering, All-Russia Research Institute of Agricultural Biotechnology, Russian Academy of Sciences, Moscow, Russia
| | - Sergey Dolgov
- Laboratory of Expression Systems and Modification of the Plant Genome “Biotron”, Branch of the Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Pushchino, Russia
- Laboratory of Plant Bioengineering, Nikita Botanical Gardens – National Scientific Center, Russian Academy of Sciences, Yalta, Russia
- Laboratory of Plant Genetic Engineering, All-Russia Research Institute of Agricultural Biotechnology, Russian Academy of Sciences, Moscow, Russia
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Wang B, Zhang Y, Zhao J, Dong M, Zhang J. Heat-Shock-Induced Removal of Transgenes Using the Gene-Deletor System in Hybrid Aspen ( Populus tremula × P. tremuloides). Genes (Basel) 2018; 9:genes9100484. [PMID: 30297683 PMCID: PMC6210648 DOI: 10.3390/genes9100484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 09/23/2018] [Accepted: 10/01/2018] [Indexed: 11/19/2022] Open
Abstract
To evaluate the efficacy of the gene-deletor system in aspen, we evaluated the system for foreign gene removal in a hybrid aspen clone, INRA 353-53 (Populus tremula × P. tremuloides). The recombinase flipping DNA (FLP) gene was under the control of the heat-inducible promoter of Gmhsp17.6-L, and the β-glucuronidase (gusA) gene which was under the control of the 35S promoter and were constructed using the gene-deletor system in the pCaLFGmFNLFG vector. Six transgenic plants and their sublines were heated at 42 °C for 8 h and gene deletion was verified by polymerase chain reaction (PCR). Three lines exhibited partial transgene deletion while the remaining three lines did not delete. Transgenic lines were evaluated by Southern-blot analyses, verifying that the six transgenic plant lines all had a single copy of transfer DNA (t-DNA). Two partial-deletion lines and two non-deletion lines were analysed for methylation and expression of promoter and recombinase. Hardly any methylation was detected in the Gmhsp17.6-L promoter or recombinase FLP gene sequences, however, the expression of the promoter and recombinase was increased significantly in the partial-deletion compared with the non-deletion line after heat-shock treatment. These results suggest that the excision efficiency had no direct relationship with methylation status of the Gmhsp17.6-L promoter and FLP recombinase, yet was affected by the expression of the Gmhsp17.6-L and FLP after heat-shock treatment.
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Affiliation(s)
- Beibei Wang
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Tree and Ornamental Plants of Ministry of Education, Key Laboratory of Forest Trees and Ornamental Plants Biological Engineering of State Forestry Administration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
- Beijing Academy of Forestry and Pomology Sciences, Beijing 100093, China.
| | - Yan Zhang
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Tree and Ornamental Plants of Ministry of Education, Key Laboratory of Forest Trees and Ornamental Plants Biological Engineering of State Forestry Administration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
| | - Jian Zhao
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Tree and Ornamental Plants of Ministry of Education, Key Laboratory of Forest Trees and Ornamental Plants Biological Engineering of State Forestry Administration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
| | - Mingliang Dong
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Tree and Ornamental Plants of Ministry of Education, Key Laboratory of Forest Trees and Ornamental Plants Biological Engineering of State Forestry Administration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
| | - Jinfeng Zhang
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Tree and Ornamental Plants of Ministry of Education, Key Laboratory of Forest Trees and Ornamental Plants Biological Engineering of State Forestry Administration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
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Kawazu Y, Fujiyama R, Imanishi S, Fukuoka H, Yamaguchi H, Matsumoto S. Development of marker-free transgenic lettuce resistant to Mirafiori lettuce big-vein virus. Transgenic Res 2016; 25:711-9. [PMID: 27055463 DOI: 10.1007/s11248-016-9956-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 04/05/2016] [Indexed: 10/22/2022]
Abstract
Lettuce big-vein disease caused by Mirafiori lettuce big-vein virus (MLBVV) is found in major lettuce production areas worldwide, but highly resistant cultivars have not yet been developed. To produce MLBVV-resistant marker-free transgenic lettuce that would have a transgene with a promoter and terminator of lettuce origin, we constructed a two T-DNA binary vector, in which the first T-DNA contained the selectable marker gene neomycin phosphotransferase II, and the second T-DNA contained the lettuce ubiquitin gene promoter and terminator and inverted repeats of the coat protein (CP) gene of MLBVV. This vector was introduced into lettuce cultivars 'Watson' and 'Fuyuhikari' by Agrobacterium tumefaciens-mediated transformation. Regenerated plants (T0 generation) that were CP gene-positive by PCR analysis were self-pollinated, and 312 T1 lines were analyzed for resistance to MLBVV. Virus-negative plants were checked for the CP gene and the marker gene, and nine lines were obtained which were marker-free and resistant to MLBVV. Southern blot analysis showed that three of the nine lines had two copies of the CP gene, whereas six lines had a single copy and were used for further analysis. Small interfering RNAs, which are indicative of RNA silencing, were detected in all six lines. MLBVV infection was inhibited in all six lines in resistance tests performed in a growth chamber and a greenhouse, resulting in a high degree of resistance to lettuce big-vein disease. Transgenic lettuce lines produced in this study could be used as resistant cultivars or parental lines for breeding.
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Affiliation(s)
- Yoichi Kawazu
- Institute of Vegetable and Floriculture Science, NARO, 360 Kusawa, Ano, Tsu, 514-2392, Mie, Japan
| | - Ryoi Fujiyama
- Institute of Vegetable and Floriculture Science, NARO, 360 Kusawa, Ano, Tsu, 514-2392, Mie, Japan
| | - Shunsuke Imanishi
- Institute of Vegetable and Floriculture Science, NARO, 360 Kusawa, Ano, Tsu, 514-2392, Mie, Japan
| | - Hiroyuki Fukuoka
- Institute of Vegetable and Floriculture Science, NARO, 360 Kusawa, Ano, Tsu, 514-2392, Mie, Japan
| | - Hirotaka Yamaguchi
- Institute of Vegetable and Floriculture Science, NARO, 360 Kusawa, Ano, Tsu, 514-2392, Mie, Japan
| | - Satoru Matsumoto
- Institute of Vegetable and Floriculture Science, NARO, 360 Kusawa, Ano, Tsu, 514-2392, Mie, Japan.
- Tohoku Agricultural Research Center, NARO, 4 Akahira, Shimo-kuriyagawa, Morioka, 020-0198, Iwate, Japan.
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Ge J, Wang L, Yang C, Ran L, Wen M, Fu X, Fan D, Luo K. Intein-mediated Cre protein assembly for transgene excision in hybrid progeny of transgenic Arabidopsis. PLANT CELL REPORTS 2016; 35:2045-2053. [PMID: 27324752 DOI: 10.1007/s00299-016-2015-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 06/07/2016] [Indexed: 06/06/2023]
Abstract
An approach for restoring recombination activity of complementation split-Cre was developed to excise the transgene in hybrid progeny of GM crops. Growing concerns about the biosafety of genetically modified (GM) crops has currently become a limited factor affecting the public acceptance. Several approaches have been developed to generate selectable-marker-gene-free GM crops. However, no strategy was reported to be broadly applicable to hybrid crops. Previous studies have demonstrated that complementation split-Cre recombinase restored recombination activity in transgenic plants. In this study, we found that split-Cre mediated by split-intein Synechocystis sp. DnaE had high recombination efficiency when Cre recombinase was split at Asp232/Asp233 (866 bp). Furthermore, we constructed two plant expression vectors, pCA-NCre-In and pCA-Ic-CCre, containing NCre866-In and Ic-CCre866 fragments, respectively. After transformation, parent lines of transgenic Arabidopsis with one single copy were generated and used for hybridization. The results of GUS staining demonstrated that the recombination activity of split-Cre could be reassembled in these hybrid progeny of transgenic plants through hybridization and the foreign genes flanked by two loxP sites were efficiently excised. Our strategy may provide an effective approach for generating the next generation of GM hybrid crops without biosafety concerns.
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Affiliation(s)
- Jia Ge
- Institute of Resources Botany, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Lijun Wang
- Institute of Resources Botany, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Chen Yang
- Institute of Resources Botany, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Lingyu Ran
- Institute of Resources Botany, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Mengling Wen
- Institute of Resources Botany, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Xianan Fu
- Institute of Resources Botany, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Di Fan
- Institute of Resources Botany, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Keming Luo
- Institute of Resources Botany, School of Life Sciences, Southwest University, Chongqing, 400715, China.
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Wang GP, Yu XD, Sun YW, Jones HD, Xia LQ. Generation of Marker- and/or Backbone-Free Transgenic Wheat Plants via Agrobacterium-Mediated Transformation. FRONTIERS IN PLANT SCIENCE 2016; 7:1324. [PMID: 27708648 PMCID: PMC5030305 DOI: 10.3389/fpls.2016.01324] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 08/18/2016] [Indexed: 05/18/2023]
Abstract
Horizontal transfer of antibiotic resistance genes to animals and vertical transfer of herbicide resistance genes to the weedy relatives are perceived as major biosafety concerns in genetically modified (GM) crops. In this study, five novel vectors which used gusA and bar as a reporter gene and a selection marker gene, respectively, were constructed based on the pCLEAN dual binary vector system. Among these vectors, 1G7B and 5G7B carried two T-DNAs located on two respective plasmids with 5G7B possessing an additional virGwt gene. 5LBTG154 and 5TGTB154 carried two T-DNAs in the target plasmid with either one or double right borders, and 5BTG154 carried the selectable marker gene on the backbone outside of the T-DNA left border in the target plasmid. In addition, 5BTG154, 5LBTG154, and 5TGTB154 used pAL154 as a helper plasmid which contains Komari fragment to facilitate transformation. These five dual binary vector combinations were transformed into Agrobacterium strain AGL1 and used to transform durum wheat cv Stewart 63. Evaluation of the co-transformation efficiencies, the frequencies of marker-free transgenic plants, and integration of backbone sequences in the obtained transgenic lines indicated that two vectors (5G7B and 5TGTB154) were more efficient in generating marker-free transgenic wheat plants with no or minimal integration of backbone sequences in the wheat genome. The vector series developed in this study for generation of marker- and/or backbone-free transgenic wheat plants via Agrobacterium-mediated transformation will be useful to facilitate the creation of "clean" GM wheat containing only the foreign genes of agronomic importance.
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Affiliation(s)
- Gen-Ping Wang
- Department of Plant Gene Resources and Molecular Design, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences (CAAS)Beijing, China
- Cereal Crops Research Laboratory of Hebei Province, National Millet Improvement Center, Institute of Millet Crops, Hebei Academy of Agriculture and Forestry SciencesShijiazhuang, China
| | - Xiu-Dao Yu
- Department of Plant Gene Resources and Molecular Design, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences (CAAS)Beijing, China
| | - Yong-Wei Sun
- Department of Plant Gene Resources and Molecular Design, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences (CAAS)Beijing, China
| | - Huw D. Jones
- Translational Genomics for Plant Breeding, Institute of Biological, Environmental and Rural Sciences, Aberystwyth UniversityAberystwyth, UK
| | - Lan-Qin Xia
- Department of Plant Gene Resources and Molecular Design, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences (CAAS)Beijing, China
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HAMZEH S, MOTALLEBI M, ZAMANI MR. Efficient seed-specifically regulated autoexcision of marker gene (nptII) with inducible expression of interest gene in transgenic Nicotiana tabacum. Turk J Biol 2016. [DOI: 10.3906/biy-1408-32] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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13
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Xu H, Wei Y, Zhu Y, Lian L, Xie H, Cai Q, Chen Q, Lin Z, Wang Z, Xie H, Zhang J. Antisense suppression of LOX3 gene expression in rice endosperm enhances seed longevity. PLANT BIOTECHNOLOGY JOURNAL 2015; 13:526-39. [PMID: 25545811 DOI: 10.1111/pbi.12277] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 09/04/2014] [Accepted: 09/10/2014] [Indexed: 05/20/2023]
Abstract
Lipid peroxidation plays a major role in seed longevity and viability. In rice grains, lipid peroxidation is catalyzed by the enzyme lipoxygenase 3 (LOX3). Previous reports showed that grain from the rice variety DawDam in which the LOX3 gene was deleted had less stale flavour after grain storage than normal rice. The molecular mechanism by which LOX3 expression is regulated during endosperm development remains unclear. In this study, we expressed a LOX3 antisense construct in transgenic rice (Oryza sativa L.) plants to down-regulate LOX3 expression in rice endosperm. The transgenic plants exhibited a marked decrease in LOX mRNA levels, normal phenotypes and a normal life cycle. We showed that LOX3 activity and its ability to produce 9-hydroperoxyoctadecadienoic acid (9-HPOD) from linoleic acid were significantly lower in transgenic seeds than in wild-type seeds by measuring the ultraviolet absorption of 9-HPOD at 234 nm and by high-performance liquid chromatography. The suppression of LOX3 expression in rice endosperm increased grain storability. The germination rate of TS-91 (antisense LOX3 transgenic line) was much higher than the WT (29% higher after artificial ageing for 21 days, and 40% higher after natural ageing for 12 months). To our knowledge, this is the first report to demonstrate that decreased LOX3 expression can preserve rice grain quality during storage with no impact on grain yield, suggesting potential applications in agricultural production.
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Affiliation(s)
- Huibin Xu
- Rice Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou, China; Incubator of National Key Laboratory of Fujian Crop Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology, Fuzhou, China; Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Ministry of Agriculture, Fuzhou, China; South-China Base of National Key Laboratory of Hybrid Rice of China, Fuzhou, China; National Engineering Laboratory of Rice, Fuzhou, Fujian, China
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14
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Gao X, Zhou J, Li J, Zou X, Zhao J, Li Q, Xia R, Yang R, Wang D, Zuo Z, Tu J, Tao Y, Chen X, Xie Q, Zhu Z, Qu S. Efficient generation of marker-free transgenic rice plants using an improved transposon-mediated transgene reintegration strategy. PLANT PHYSIOLOGY 2015; 167:11-24. [PMID: 25371551 PMCID: PMC4280998 DOI: 10.1104/pp.114.246173] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 11/02/2014] [Indexed: 05/27/2023]
Abstract
Marker-free transgenic plants can be developed through transposon-mediated transgene reintegration, which allows intact transgene insertion with defined boundaries and requires only a few primary transformants. In this study, we improved the selection strategy and validated that the maize (Zea mays) Activator/Dissociation (Ds) transposable element can be routinely used to generate marker-free transgenic plants. A Ds-based gene of interest was linked to green fluorescent protein in transfer DNA (T-DNA), and a green fluorescent protein-aided counterselection against T-DNA was used together with polymerase chain reaction (PCR)-based positive selection for the gene of interest to screen marker-free progeny. To test the efficacy of this strategy, we cloned the Bacillus thuringiensis (Bt) δ-endotoxin gene into the Ds elements and transformed transposon vectors into rice (Oryza sativa) cultivars via Agrobacterium tumefaciens. PCR assays of the transposon empty donor site exhibited transposition in somatic cells in 60.5% to 100% of the rice transformants. Marker-free (T-DNA-free) transgenic rice plants derived from unlinked germinal transposition were obtained from the T1 generation of 26.1% of the primary transformants. Individual marker-free transgenic rice lines were subjected to thermal asymmetric interlaced-PCR to determine Ds(Bt) reintegration positions, reverse transcription-PCR and enzyme-linked immunosorbent assay to detect Bt expression levels, and bioassays to confirm resistance against the striped stem borer Chilo suppressalis. Overall, we efficiently generated marker-free transgenic plants with optimized transgene insertion and expression. The transposon-mediated marker-free platform established in this study can be used in rice and possibly in other important crops.
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Affiliation(s)
- Xiaoqing Gao
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Jie Zhou
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Jun Li
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Xiaowei Zou
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Jianhua Zhao
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Qingliang Li
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Ran Xia
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Ruifang Yang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Dekai Wang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Zhaoxue Zuo
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Jumin Tu
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Yuezhi Tao
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Xiaoyun Chen
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Qi Xie
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Zengrong Zhu
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Shaohong Qu
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control and Institute of Virology and Biotechnology (X.G., J.Zho., J.L., X.Z., J.Zha., Y.T., S.Q.), Institute of Crop Science and Nuclear Technology Utilization (D.W.), and Institute of Quality Standards for Agricultural Products (X.C.), Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China;Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China (Q.L., R.X., Q.X.); andInstitute of Crop Science (R.Y., J.T.) and Institute of Insect Sciences (Z.Zu., Z.Zh.), Zhejiang University, Hangzhou, Zhejiang 310058, China
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15
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Nishizawa-Yokoi A, Endo M, Osakabe K, Saika H, Toki S. Precise marker excision system using an animal-derived piggyBac transposon in plants. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2014; 77:454-63. [PMID: 24164672 PMCID: PMC4282535 DOI: 10.1111/tpj.12367] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 10/17/2013] [Accepted: 10/22/2013] [Indexed: 05/04/2023]
Abstract
Accurate and effective positive marker excision is indispensable for the introduction of desired mutations into the plant genome via gene targeting (GT) using a positive/negative counter selection system. In mammals, the moth-derived piggyBac transposon system has been exploited successfully to eliminate a selectable marker from a GT locus without leaving a footprint. Here, we present evidence that the piggyBac transposon also functions in plant cells. To demonstrate the use of the piggyBac transposon for effective marker excision in plants, we designed a transposition assay system that allows the piggyBac transposition to be visualized as emerald luciferase (Eluc) luminescence in rice cells. The Eluc signal derived from piggyBac excision was observed in hyperactive piggyBac transposase-expressing rice calli. Polymerase chain reaction, Southern blot analyses and sequencing revealed the efficient and precise transposition of piggyBac in these calli. Furthermore, we have demonstrated the excision of a selection marker from a reporter locus in T0 plants without concomitant re-integration of the transposon and at a high frequency (44.0% of excision events), even in the absence of negative selection.
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Affiliation(s)
- Ayako Nishizawa-Yokoi
- Plant Genome Engineering Research Unit, National Institute of Agrobiological Sciences2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan
| | - Masaki Endo
- Plant Genome Engineering Research Unit, National Institute of Agrobiological Sciences2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan
| | - Keishi Osakabe
- Plant Genome Engineering Research Unit, National Institute of Agrobiological Sciences2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan
- †Present address: Center for Collaboration among Agriculture, Industry and Commerce, University of Tokushima, 2-24 Shinkura-cho, Tokushima-city, Tokushima 770-8501, Japan
| | - Hiroaki Saika
- Plant Genome Engineering Research Unit, National Institute of Agrobiological Sciences2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan
| | - Seiichi Toki
- Plant Genome Engineering Research Unit, National Institute of Agrobiological Sciences2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan
- Kihara Institute for Biological Research, Yokohama City University641-12 Maioka-cho, Yokohama, 244-0813, Japan
- *For correspondence (e-mail )
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16
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Endo M, Toki S. Toward establishing an efficient and versatile gene targeting system in higher plants. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2014. [DOI: 10.1016/j.bcab.2013.10.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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17
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Bergougnoux V. The history of tomato: From domestication to biopharming. Biotechnol Adv 2014; 32:170-89. [DOI: 10.1016/j.biotechadv.2013.11.003] [Citation(s) in RCA: 169] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 10/24/2013] [Accepted: 11/03/2013] [Indexed: 11/28/2022]
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18
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Jiang Y, Sun L, Jiang M, Li K, Song Y, Zhu C. Production of marker-free and RSV-resistant transgenic rice using a twin T-DNA system and RNAi. J Biosci 2013; 38:573-81. [PMID: 23938389 DOI: 10.1007/s12038-013-9349-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A twin T-DNA system is a convenient strategy for creating selectable marker-free transgenic plants. The standard transformation plasmid, pCAMBIA 1300, was modified into a binary vector consisting of two separate T-DNAs, one of which contained the hygromycin phosphotransferase (hpt) marker gene. Using this binary vector, we constructed two vectors that expressed inverted-repeat (IR) structures targeting the rice stripe virus (RSV) coat protein (CP) gene and the special-disease protein (SP) gene. Transgenic rice lines were obtained via Agrobacterium-mediated transformation. Seven independent clones harbouring both the hpt marker gene and the target genes (RSV CP or SP) were obtained in the primary transformants of pDTRSVCP and pDTRSVSP, respectively. The segregation frequencies of the target gene and the marker gene in the T1 plants were 8.72 percent for pDTRSVCP and 12.33 percent for pDTRSVSP. Two of the pDTRSVCP lines and three pDTRSVSP lines harbouring the homozygous target gene, but not the hpt gene, were strongly resistant to RSV. A molecular analysis of the resistant transgenic plants confirmed the stable integration and expression of the target genes. The resistant transgenic plants displayed lower levels of the transgene transcripts and specific small interfering RNAs, suggesting that RNAi induced the viral resistance.
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Affiliation(s)
- Yayuan Jiang
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, P.R. China, 271018
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Dutt M, Li ZT, Dhekney SA, Gray DJ. Co-transformation of grapevine somatic embryos to produce transgenic plants free of marker genes. Methods Mol Biol 2012; 847:201-213. [PMID: 22351010 DOI: 10.1007/978-1-61779-558-9_17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A cotransformation system using somatic embryos was developed to produce grapevines free of selectable marker genes. This was achieved by transforming Vitis vinifera L. "Thompson Seedless" somatic embryos with a mixture of two Agrobacterium strains. The first strain contained a binary plasmid with an egfp gene of interest between the T-DNA borders. The second strain harbored the neomycin phosphotransferase (nptII) gene for positive selection and the cytosine deaminase (codA) gene for negative selection, linked together by a bidirectional dual promoter complex. Our technique included a short positive selection phase of cotransformed somatic embryos on liquid medium containing 100 mg/L kanamycin before subjecting cultures to prolonged negative selection on medium containing 250 mg/L 5-fluorocytosine.
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Affiliation(s)
- Manjul Dutt
- Citrus Research and Education Center, University of Florida/IFAS, Lake Alfred, FL, USA
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Wakasa Y, Ozawa K, Takaiwa F. Agrobacterium-mediated transformation of a low glutelin mutant of 'Koshihikari' rice variety using the mutated-acetolactate synthase gene derived from rice genome as a selectable marker. PLANT CELL REPORTS 2007; 26:1567-73. [PMID: 17516071 DOI: 10.1007/s00299-007-0373-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2007] [Revised: 04/13/2007] [Accepted: 04/24/2007] [Indexed: 05/15/2023]
Abstract
We have developed an efficient rice transformation system that uses only rice genome-derived components. The transgenic 'Koshihikari' rice, low-glutelin mutant a123, is capable of accumulating large amounts of bioactive peptides in the endosperm. Agrobacterium-mediated transformation using the mutated-acetolactate synthase (mALS) gene expressed under the control of the callus-specific promoter (CSP) as a selectable marker was used to introduce GFP and an anti-hypertensive hexapeptide into 'Koshihikari' a123. The CSP:mALS gene cassette confers pyrimidinyl carboxy herbicide resistance to transgenic rice callus, but is not expressed in regenerated plants. Transformation efficiency of transgenic rice line a123 was improved from about 10% to about 30% by modifying callus induction, callus selection and regeneration media conventionally used for rice tissue culture.
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Affiliation(s)
- Yuhya Wakasa
- Transgenic Crop Research and Development Center, National Institute of Agrobiological Sciences, Kannondai 3-1-3, Tsukuba, Ibaraki 305-8602, Japan.
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Shrawat AK, Lörz H. Agrobacterium-mediated transformation of cereals: a promising approach crossing barriers. PLANT BIOTECHNOLOGY JOURNAL 2006; 4:575-603. [PMID: 17309731 DOI: 10.1111/j.1467-7652.2006.00209.x] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Cereal crops have been the primary targets for improvement by genetic transformation because of their worldwide importance for human consumption. For a long time, many of these important cereals were difficult to genetically engineer, mainly as a result of their inherent limitations associated with the resistance to Agrobacterium infection and their recalcitrance to in vitro regeneration. The delivery of foreign genes to rice plants via Agrobacterium tumefaciens has now become a routine technique. However, there are still serious handicaps with Agrobacterium-mediated transformation of other major cereals. In this paper, we review the pioneering efforts, existing problems and future prospects of Agrobacterium-mediated genetic transformation of major cereal crops, such as rice, maize, wheat, barley, sorghum and sugarcane.
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Affiliation(s)
- Ashok Kumar Shrawat
- Centre for Applied Plant Molecular Biology (AMP II), University of Hamburg, Ohnhorststrasse 18, D-22609 Hamburg, Germany.
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22
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Mlynárová L, Conner AJ, Nap JP. Directed microspore-specific recombination of transgenic alleles to prevent pollen-mediated transmission of transgenes. PLANT BIOTECHNOLOGY JOURNAL 2006; 4:445-52. [PMID: 17177809 DOI: 10.1111/j.1467-7652.2006.00194.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
A major challenge for future genetically modified (GM) crops is to prevent undesired gene flow of transgenes to plant material intended for another use. Recombinase-mediated auto excision of transgenes directed by a tightly controlled microspore-specific promoter allows efficient removal of either the selectable marker gene or of all introduced transgenes during microsporogenesis. This way, transgene removal becomes an integral part of the biology of pollen maturation, not requiring any external stimulus such as chemical induction by spraying. We here show the feasibility of engineering transgenic plants to produce pollen devoid of any transgene. Highly efficient excision of transgenes from tobacco pollen was achieved with a potential failure rate of at most two out of 16,800 seeds (0.024%). No evidence for either premature activation or absence of activation of the recombinase system was observed under stress conditions in the laboratory. This approach can prevent adventitious presence of transgenes in non-GM crops or related wild species by gene flow. Such biological containment may help the deployment and management of coexistence practices to support consumer choice and will promote clean molecular farming for the production of high-value compounds in plants.
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Affiliation(s)
- Ludmila Mlynárová
- Plant Sciences Group, Wageningen University and Research Centre, PO Box 16, 6700 AA Wageningen, The Netherlands
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23
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Sreekala C, Wu L, Gu K, Wang D, Tian D, Yin Z. Excision of a selectable marker in transgenic rice (Oryza sativa L.) using a chemically regulated Cre/loxP system. PLANT CELL REPORTS 2005; 24:86-94. [PMID: 15662501 DOI: 10.1007/s00299-004-0909-5] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2004] [Revised: 11/28/2004] [Accepted: 11/29/2004] [Indexed: 05/08/2023]
Abstract
Removal of a selectable marker gene from genetically modified (GM) crops alleviates the risk of its release into the environment and hastens the public acceptance of GM crops. Here we report the production of marker-free transgenic rice by using a chemically regulated, Cre/loxP-mediated site-specific DNA recombination in a single transformation. Among 86 independent transgenic lines, ten were found to be marker-free in the T0 generation and an additional 17 lines segregated marker-free transgenic plants in the T1 generation. Molecular and genetic analyses indicated that the DNA recombination and excision in transgenic rice were precise and the marker-free recombinant T-DNA was stable and heritable.
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Affiliation(s)
- C Sreekala
- Laboratory of Molecular Plant Pathology, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore, 117604, Republic of Singapore
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24
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Kopertekh L, Jüttner G, Schiemann J. PVX-Cre-mediated marker gene elimination from transgenic plants. PLANT MOLECULAR BIOLOGY 2004; 55:491-500. [PMID: 15604695 DOI: 10.1007/s11103-004-0237-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Cre recombinase gene from bacteriophage P1 was transiently expressed by a Potato Virus X (PVX)-based vector in transgenic lox -target Nicotiana benthamiana plants to remove the selectable marker gene. The target construct consisted of two directly oriented lox sites flanking a bar gene located between a gfp coding region and an upstream CaMV 35S promoter. The Cre-mediated excision of intervening sequence placed the gfp coding region under the transcriptional control of the CaMV 35S promoter. GFP activity was observed in PVX-Cre systemically infected leaves, regenerants from PVX-Cre infected explants and T1 progeny of these regenerants. PVX-Cre was removed efficiently from the regenerants by adding the nucleoside analogue ribavirin to the culture medium. Molecular data proved a correlation between gfp expression and precise site-specific excision of the bar gene in all examined transgenic lines. The frequency of recombination expressed as a percentage of regenerated plants exhibiting marker gene excision varied from 48% to 82%. These results demonstrate that a plant virus vector can be used efficiently to express cre recombinase in vivo providing an alternative method for the production of transgenic plants without marker genes.
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Affiliation(s)
- L Kopertekh
- Federal Biological Research Centre for Agriculture and Forestry, Institute for Plant Virology, Microbiology and Biosafety, Messeweg 11-12, Braunschweig, Germany
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