1
|
Kumari R, Saha T, Kumar P, Singh AK. CRISPR/Cas9-mediated genome editing technique to control fall armyworm ( Spodoptera frugiperda) in crop plants with special reference to maize. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2024; 30:1161-1173. [PMID: 39100879 PMCID: PMC11291824 DOI: 10.1007/s12298-024-01486-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 06/29/2024] [Accepted: 07/04/2024] [Indexed: 08/06/2024]
Abstract
Fall Armyworm imposes a major risk to agricultural losses. Insecticides have historically been used to manage its infestations, but it eventually becomes resistant to them. To combat the pest, a more recent strategy based on the use of transgenic maize that expresses Bt proteins such as Cry1F from the bacteria has been used. Nonetheless, there have been numerous reports of Cry1F maize resistance in FAW populations. Nowadays, the more effective and less time-consuming genome editing method known as CRISPR/Cas9 technology has gradually supplanted these various breeding techniques. This method successfully edits the genomes of various insects, including Spodoptera frugiperda. On the other hand, this new technique can change an insect's DNA to overcome its tolerance to specific insecticides or to generate a gene drive. The production of plant cultivars resistant to fall armyworms holds great potential for the sustainable management of this pest, given the swift advancement of CRISPR/Cas9 technology and its varied uses. Thus, this review article discussed and critically assessed the use of CRISPR/Cas9 genome-editing technology in long-term fall armyworm pest management. However, this review study focuses primarily on the mechanism of the CRISPR-Cas9 system in both crop plants and insects for FAW management.
Collapse
Affiliation(s)
- Rima Kumari
- Division of Plant Biotechnology, College of Agricultural Biotechnology, Bihar Agricultural University, Sabour, Bihar 813210 India
| | - Tamoghna Saha
- Department of Entomology, Bihar Agricultural University, Sabour, Bihar 813210 India
| | - Pankaj Kumar
- Department of Molecular Biology and Genetic Engineering, Bihar Agricultural University, Sabour, Bihar 813210 India
| | - A. K. Singh
- Bihar Agricultural University, Sabour, 813210 Bihar India
| |
Collapse
|
2
|
Becker M, Hensel G. Ribonucleoprotein (RNP)-Mediated Allele Replacement in Barley (Hordeum vulgare L.) Leaves. Methods Mol Biol 2023; 2653:199-205. [PMID: 36995628 DOI: 10.1007/978-1-0716-3131-7_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Varietal differences within a species with agronomic importance are often based on minor changes in the genomic sequence. For example, fungus-resistant and fungus-susceptible wheat varieties may vary in only one amino acid. The situation is similar with the reporter genes Gfp and Yfp where two base pairs cause a shift in the emission spectrum from green to yellow. Methods of targeted double-strand break induction now allow this exchange precisely with the simultaneous transfer of the desired repair template. However, these changes rarely lead to a selective advantage that can be used in generating such mutant plants. The protocol presented here allows a corresponding allele replacement at the cellular level using ribonucleoprotein complexes in combination with an appropriate repair template. The efficiencies achieved are comparable to other methods with direct DNA transfer or integration of the corresponding building blocks in the host genome. They are in the range of 35 percent, considering one allele in a diploid organism as barley and using Cas9 RNP complexes.
Collapse
Affiliation(s)
- Martin Becker
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Plant Reproductive Biology, Gatersleben, Germany
- Stilla Technologies, Villejuif, France
| | - Goetz Hensel
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Plant Reproductive Biology, Gatersleben, Germany.
- Division of Molecular Biology, Centre of the Region Hana for Biotechnological and Agriculture Research, Faculty of Science, Palacký University, Olomouc, Czech Republic.
- Centre for Plant Genome Engineering, Institute of Plant Biochemistry, Heinrich-Heine-University, Dusseldorf, Germany.
| |
Collapse
|
3
|
Garcia-Gimenez G, Jobling SA. Gene editing for barley grain quality improvement. J Cereal Sci 2022. [DOI: 10.1016/j.jcs.2021.103394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
4
|
Lawrenson T, Hinchliffe A, Clarke M, Morgan Y, Harwood W. In-planta Gene Targeting in Barley Using Cas9 With and Without Geminiviral Replicons. Front Genome Ed 2021; 3:663380. [PMID: 34713258 PMCID: PMC8525372 DOI: 10.3389/fgeed.2021.663380] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 04/29/2021] [Indexed: 11/13/2022] Open
Abstract
Advances in the use of RNA-guided Cas9-based genome editing in plants have been rapid over the last few years. A desirable application of genome editing is gene targeting (GT), as it allows a wide range of precise modifications; however, this remains inefficient especially in key crop species. Here, we describe successful, heritable gene targeting in barley at the target site of Cas9 using an in-planta strategy but fail to achieve the same using a wheat dwarf virus replicon to increase the copy number of the repair template. Without the replicon, we were able to delete 150 bp of the coding sequence of our target gene whilst simultaneously fusing in-frame mCherry in its place. Starting from 14 original transgenic plants, two plants appeared to have the required gene targeting event. From one of these T0 plants, three independent gene targeting events were identified, two of which were heritable. When the replicon was included, 39 T0 plants were produced and shown to have high copy numbers of the repair template. However, none of the 17 lines screened in T1 gave rise to significant or heritable gene targeting events despite screening twice the number of plants in T1 compared with the non-replicon strategy. Investigation indicated that high copy numbers of repair template created by the replicon approach cause false-positive PCR results which are indistinguishable at the sequence level to true GT events in junction PCR screens widely used in GT studies. In the successful non-replicon approach, heritable gene targeting events were obtained in T1, and subsequently, the T-DNA was found to be linked to the targeted locus. Thus, physical proximity of target and donor sites may be a factor in successful gene targeting.
Collapse
Affiliation(s)
- Tom Lawrenson
- John Innes Centre, Norwich Research Park, Norwich, United Kingdom
| | | | - Martha Clarke
- John Innes Centre, Norwich Research Park, Norwich, United Kingdom
| | - Yvie Morgan
- John Innes Centre, Norwich Research Park, Norwich, United Kingdom
| | - Wendy Harwood
- John Innes Centre, Norwich Research Park, Norwich, United Kingdom
| |
Collapse
|
5
|
Miki D, Wang R, Li J, Kong D, Zhang L, Zhu JK. Gene Targeting Facilitated by Engineered Sequence-Specific Nucleases: Potential Applications for Crop Improvement. PLANT & CELL PHYSIOLOGY 2021; 62:752-765. [PMID: 33638992 PMCID: PMC8484935 DOI: 10.1093/pcp/pcab034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 02/09/2021] [Accepted: 02/23/2021] [Indexed: 05/04/2023]
Abstract
Humans are currently facing the problem of how to ensure that there is enough food to feed all of the world's population. Ensuring that the food supply is sufficient will likely require the modification of crop genomes to improve their agronomic traits. The development of engineered sequence-specific nucleases (SSNs) paved the way for targeted gene editing in organisms, including plants. SSNs generate a double-strand break (DSB) at the target DNA site in a sequence-specific manner. These DSBs are predominantly repaired via error-prone non-homologous end joining and are only rarely repaired via error-free homology-directed repair if an appropriate donor template is provided. Gene targeting (GT), i.e. the integration or replacement of a particular sequence, can be achieved with combinations of SSNs and repair donor templates. Although its efficiency is extremely low, GT has been achieved in some higher plants. Here, we provide an overview of SSN-facilitated GT in higher plants and discuss the potential of GT as a powerful tool for generating crop plants with desirable features.
Collapse
Affiliation(s)
- Daisuke Miki
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Rui Wang
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Li
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dali Kong
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lei Zhang
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jian-Kang Zhu
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA
| |
Collapse
|
6
|
Hisano H, Abe F, Hoffie RE, Kumlehn J. Targeted genome modifications in cereal crops. BREEDING SCIENCE 2021; 71:405-416. [PMID: 34912167 PMCID: PMC8661484 DOI: 10.1270/jsbbs.21019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 04/13/2021] [Indexed: 05/15/2023]
Abstract
The recent advent of customizable endonucleases has led to remarkable advances in genetic engineering, as these molecular scissors allow for the targeted introduction of mutations or even precisely predefined genetic modifications into virtually any genomic target site of choice. Thanks to its unprecedented precision, efficiency, and functional versatility, this technology, commonly referred to as genome editing, has become an effective force not only in basic research devoted to the elucidation of gene function, but also for knowledge-based improvement of crop traits. Among the different platforms currently available for site-directed genome modifications, RNA-guided clustered regularly interspaced short palindromic repeats (CRISPR)-associated (Cas) endonucleases have proven to be the most powerful. This review provides an application-oriented overview of the development of customizable endonucleases, current approaches to cereal crop breeding, and future opportunities in this field.
Collapse
Affiliation(s)
- Hiroshi Hisano
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama 710-0046, Japan
| | - Fumitaka Abe
- Institute of Crop Science, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-8518, Japan
| | - Robert E. Hoffie
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), D-06466 Stadt Seeland/OT Gatersleben, Germany
| | - Jochen Kumlehn
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), D-06466 Stadt Seeland/OT Gatersleben, Germany
| |
Collapse
|
7
|
Matres JM, Hilscher J, Datta A, Armario-Nájera V, Baysal C, He W, Huang X, Zhu C, Valizadeh-Kamran R, Trijatmiko KR, Capell T, Christou P, Stoger E, Slamet-Loedin IH. Genome editing in cereal crops: an overview. Transgenic Res 2021; 30:461-498. [PMID: 34263445 PMCID: PMC8316241 DOI: 10.1007/s11248-021-00259-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Accepted: 05/15/2021] [Indexed: 02/06/2023]
Abstract
Genome-editing technologies offer unprecedented opportunities for crop improvement with superior precision and speed. This review presents an analysis of the current state of genome editing in the major cereal crops- rice, maize, wheat and barley. Genome editing has been used to achieve important agronomic and quality traits in cereals. These include adaptive traits to mitigate the effects of climate change, tolerance to biotic stresses, higher yields, more optimal plant architecture, improved grain quality and nutritional content, and safer products. Not all traits can be achieved through genome editing, and several technical and regulatory challenges need to be overcome for the technology to realize its full potential. Genome editing, however, has already revolutionized cereal crop improvement and is poised to shape future agricultural practices in conjunction with other breeding innovations.
Collapse
Affiliation(s)
- Jerlie Mhay Matres
- Genetic Design and Validation Unit, International Rice Research Institute, Los Banos, Philippines
| | - Julia Hilscher
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Akash Datta
- Genetic Design and Validation Unit, International Rice Research Institute, Los Banos, Philippines
| | - Victoria Armario-Nájera
- Department of Plant Production and Forestry Science, School of Agrifood and Forestry Science and Engineering (ETSEA), University of Lleida-Agrotecnio CERCA Center, Lleida, Spain
| | - Can Baysal
- Department of Plant Production and Forestry Science, School of Agrifood and Forestry Science and Engineering (ETSEA), University of Lleida-Agrotecnio CERCA Center, Lleida, Spain
| | - Wenshu He
- Department of Plant Production and Forestry Science, School of Agrifood and Forestry Science and Engineering (ETSEA), University of Lleida-Agrotecnio CERCA Center, Lleida, Spain
| | - Xin Huang
- Department of Plant Production and Forestry Science, School of Agrifood and Forestry Science and Engineering (ETSEA), University of Lleida-Agrotecnio CERCA Center, Lleida, Spain
| | - Changfu Zhu
- Department of Plant Production and Forestry Science, School of Agrifood and Forestry Science and Engineering (ETSEA), University of Lleida-Agrotecnio CERCA Center, Lleida, Spain
| | - Rana Valizadeh-Kamran
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
- Department of Biotechnology, Azarbaijan Shahid Madani University, Tabriz, Iran
| | - Kurniawan R Trijatmiko
- Genetic Design and Validation Unit, International Rice Research Institute, Los Banos, Philippines
| | - Teresa Capell
- Department of Plant Production and Forestry Science, School of Agrifood and Forestry Science and Engineering (ETSEA), University of Lleida-Agrotecnio CERCA Center, Lleida, Spain
| | - Paul Christou
- Department of Plant Production and Forestry Science, School of Agrifood and Forestry Science and Engineering (ETSEA), University of Lleida-Agrotecnio CERCA Center, Lleida, Spain
- ICREA, Catalan Institute for Research and Advanced Studies (ICREA), Barcelona, Spain
| | - Eva Stoger
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria.
| | - Inez H Slamet-Loedin
- Genetic Design and Validation Unit, International Rice Research Institute, Los Banos, Philippines.
| |
Collapse
|
8
|
Gogolev YV, Ahmar S, Akpinar BA, Budak H, Kiryushkin AS, Gorshkov VY, Hensel G, Demchenko KN, Kovalchuk I, Mora-Poblete F, Muslu T, Tsers ID, Yadav NS, Korzun V. OMICs, Epigenetics, and Genome Editing Techniques for Food and Nutritional Security. PLANTS (BASEL, SWITZERLAND) 2021; 10:1423. [PMID: 34371624 PMCID: PMC8309286 DOI: 10.3390/plants10071423] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/30/2021] [Accepted: 07/07/2021] [Indexed: 12/22/2022]
Abstract
The incredible success of crop breeding and agricultural innovation in the last century greatly contributed to the Green Revolution, which significantly increased yields and ensures food security, despite the population explosion. However, new challenges such as rapid climate change, deteriorating soil, and the accumulation of pollutants require much faster responses and more effective solutions that cannot be achieved through traditional breeding. Further prospects for increasing the efficiency of agriculture are undoubtedly associated with the inclusion in the breeding strategy of new knowledge obtained using high-throughput technologies and new tools in the future to ensure the design of new plant genomes and predict the desired phenotype. This article provides an overview of the current state of research in these areas, as well as the study of soil and plant microbiomes, and the prospective use of their potential in a new field of microbiome engineering. In terms of genomic and phenomic predictions, we also propose an integrated approach that combines high-density genotyping and high-throughput phenotyping techniques, which can improve the prediction accuracy of quantitative traits in crop species.
Collapse
Affiliation(s)
- Yuri V. Gogolev
- Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Kazan Institute of Biochemistry and Biophysics, 420111 Kazan, Russia;
- Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Laboratory of Plant Infectious Diseases, 420111 Kazan, Russia;
| | - Sunny Ahmar
- Institute of Biological Sciences, University of Talca, 1 Poniente 1141, Talca 3460000, Chile; (S.A.); (F.M.-P.)
| | | | - Hikmet Budak
- Montana BioAg Inc., Missoula, MT 59802, USA; (B.A.A.); (H.B.)
| | - Alexey S. Kiryushkin
- Laboratory of Cellular and Molecular Mechanisms of Plant Development, Komarov Botanical Institute of the Russian Academy of Sciences, 197376 Saint Petersburg, Russia; (A.S.K.); (K.N.D.)
| | - Vladimir Y. Gorshkov
- Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Kazan Institute of Biochemistry and Biophysics, 420111 Kazan, Russia;
- Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Laboratory of Plant Infectious Diseases, 420111 Kazan, Russia;
| | - Goetz Hensel
- Centre for Plant Genome Engineering, Institute of Plant Biochemistry, Heinrich-Heine-University, 40225 Dusseldorf, Germany;
- Centre of the Region Haná for Biotechnological and Agricultural Research, Czech Advanced Technology and Research Institute, Palacký University Olomouc, 78371 Olomouc, Czech Republic
| | - Kirill N. Demchenko
- Laboratory of Cellular and Molecular Mechanisms of Plant Development, Komarov Botanical Institute of the Russian Academy of Sciences, 197376 Saint Petersburg, Russia; (A.S.K.); (K.N.D.)
| | - Igor Kovalchuk
- Department of Biological Sciences, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada; (I.K.); (N.S.Y.)
| | - Freddy Mora-Poblete
- Institute of Biological Sciences, University of Talca, 1 Poniente 1141, Talca 3460000, Chile; (S.A.); (F.M.-P.)
| | - Tugdem Muslu
- Faculty of Engineering and Natural Sciences, Sabanci University, 34956 Istanbul, Turkey;
| | - Ivan D. Tsers
- Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Laboratory of Plant Infectious Diseases, 420111 Kazan, Russia;
| | - Narendra Singh Yadav
- Department of Biological Sciences, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada; (I.K.); (N.S.Y.)
| | - Viktor Korzun
- Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Laboratory of Plant Infectious Diseases, 420111 Kazan, Russia;
- KWS SAAT SE & Co. KGaA, Grimsehlstr. 31, 37555 Einbeck, Germany
| |
Collapse
|
9
|
A review of CRISPR associated genome engineering: application, advances and future prospects of genome targeting tool for crop improvement. Biotechnol Lett 2020; 42:1611-1632. [PMID: 32642978 DOI: 10.1007/s10529-020-02950-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 06/25/2020] [Indexed: 02/04/2023]
Abstract
The Cas9 nuclease initiates double-stranded breaks at the target position in DNA, which are repaired by the intracellular restoration pathways to eliminate or insert pieces of DNA. CRISPR-Cas9 is proficient and cost-effective since cutting is guided by a piece of RNA instead of protein. Emphasis on this technology, in contrast with two recognized genome editing platforms (i.e., ZFNs and TALENs), is provided. This review evaluates the benefits of chemically synthesized gRNAs as well as the integration of chemical amendments to improve gene editing efficiencies. CRISPR is an indispensable means in biological investigations and is now as well transforming varied fields of biotechnology and agriculture. Recent advancement in targetable epigenomic-editing tools allows researchers to dispense direct functional and transcriptional significance to locus-explicit chromatin adjustments encompassing gene regulation and editing. An account of diverse sgRNA design tools is provided, principally on their target competence prediction model, off-target recognition algorithm, and generation of instructive annotations. The modern systems that have been utilized to deliver CRISPR-Cas9 in vivo and in vitro for crop improvement viz. nutritional enhancement, production of drought-tolerant and disease-resistant plants, are also highlighted. The conclusion is focused on upcoming directions, biosafety concerns, and expansive prospects of CRISPR technologies.
Collapse
|
10
|
Hensel G. Genetic transformation of Triticeae cereals – Summary of almost three-decade's development. Biotechnol Adv 2020; 40:107484. [DOI: 10.1016/j.biotechadv.2019.107484] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 09/23/2019] [Accepted: 11/16/2019] [Indexed: 10/25/2022]
|
11
|
El-Mounadi K, Morales-Floriano ML, Garcia-Ruiz H. Principles, Applications, and Biosafety of Plant Genome Editing Using CRISPR-Cas9. FRONTIERS IN PLANT SCIENCE 2020; 11:56. [PMID: 32117392 PMCID: PMC7031443 DOI: 10.3389/fpls.2020.00056] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 01/15/2020] [Indexed: 05/13/2023]
Abstract
The terms genome engineering, genome editing, and gene editing, refer to modifications (insertions, deletions, substitutions) in the genome of a living organism. The most widely used approach to genome editing nowadays is based on Clustered Regularly Interspaced Short Palindromic Repeats and associated protein 9 (CRISPR-Cas9). In prokaryotes, CRISPR-Cas9 is an adaptive immune system that naturally protects cells from DNA virus infections. CRISPR-Cas9 has been modified to create a versatile genome editing technology that has a wide diversity of applications in medicine, agriculture, and basic studies of gene functions. CRISPR-Cas9 has been used in a growing number of monocot and dicot plant species to enhance yield, quality, and nutritional value, to introduce or enhance tolerance to biotic and abiotic stresses, among other applications. Although biosafety concerns remain, genome editing is a promising technology with potential to contribute to food production for the benefit of the growing human population. Here, we review the principles, current advances and applications of CRISPR-Cas9-based gene editing in crop improvement. We also address biosafety concerns and show that humans have been exposed to Cas9 protein homologues long before the use of CRISPR-Cas9 in genome editing.
Collapse
Affiliation(s)
- Kaoutar El-Mounadi
- Department of Biology, Kuztown University of Pennsylvania, Kuztown, PA, United States
| | - María Luisa Morales-Floriano
- Recursos Genéticos y Productividad-Genética, Colegio de Postgraduados, Texcoco, Montecillo, Mexico
- Department of Plant Pathology and Nebraska Center for Virology, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Hernan Garcia-Ruiz
- Department of Plant Pathology and Nebraska Center for Virology, University of Nebraska-Lincoln, Lincoln, NE, United States
| |
Collapse
|
12
|
Van Vu T, Sung YW, Kim J, Doan DTH, Tran MT, Kim JY. Challenges and Perspectives in Homology-Directed Gene Targeting in Monocot Plants. RICE (NEW YORK, N.Y.) 2019; 12:95. [PMID: 31858277 PMCID: PMC6923311 DOI: 10.1186/s12284-019-0355-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 12/04/2019] [Indexed: 05/18/2023]
Abstract
Continuing crop domestication/redomestication and modification is a key determinant of the adaptation and fulfillment of the food requirements of an exploding global population under increasingly challenging conditions such as climate change and the reduction in arable lands. Monocotyledonous crops are not only responsible for approximately 70% of total global crop production, indicating their important roles in human life, but also the first crops to be challenged with the abovementioned hurdles; hence, monocot crops should be the first to be engineered and/or de novo domesticated/redomesticated. A long time has passed since the first green revolution; the world is again facing the challenge of feeding a predicted 9.7 billion people in 2050, since the decline in world hunger was reversed in 2015. One of the major lessons learned from the first green revolution is the importance of novel and advanced trait-carrying crop varieties that are ideally adapted to new agricultural practices. New plant breeding techniques (NPBTs), such as genome editing, could help us succeed in this mission to create novel and advanced crops. Considering the importance of NPBTs in crop genetic improvement, we attempt to summarize and discuss the latest progress with major approaches, such as site-directed mutagenesis using molecular scissors, base editors and especially homology-directed gene targeting (HGT), a very challenging but potentially highly precise genome modification approach in plants. We therefore suggest potential approaches for the improvement of practical HGT, focusing on monocots, and discuss a potential approach for the regulation of genome-edited products.
Collapse
Affiliation(s)
- Tien Van Vu
- Division of Applied Life Science (BK21 Plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, 660-701, Republic of Korea
- National Key Laboratory for Plant Cell Biotechnology, Agricultural Genetics Institute, Km 02, Pham Van Dong Road, Co Nhue 1, Bac Tu Liem, Hanoi, 11917, Vietnam
| | - Yeon Woo Sung
- Division of Applied Life Science (BK21 Plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, 660-701, Republic of Korea
| | - Jihae Kim
- Division of Applied Life Science (BK21 Plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, 660-701, Republic of Korea
| | - Duong Thi Hai Doan
- Division of Applied Life Science (BK21 Plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, 660-701, Republic of Korea
| | - Mil Thi Tran
- Division of Applied Life Science (BK21 Plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, 660-701, Republic of Korea
| | - Jae-Yean Kim
- Division of Applied Life Science (BK21 Plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, 660-701, Republic of Korea.
- Division of Life Science, Gyeongsang National University, 501 Jinju-daero, Jinju, 52828, Republic of Korea.
| |
Collapse
|
13
|
Koeppel I, Hertig C, Hoffie R, Kumlehn J. Cas Endonuclease Technology-A Quantum Leap in the Advancement of Barley and Wheat Genetic Engineering. Int J Mol Sci 2019; 20:ijms20112647. [PMID: 31146387 PMCID: PMC6600890 DOI: 10.3390/ijms20112647] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 05/24/2019] [Accepted: 05/24/2019] [Indexed: 12/21/2022] Open
Abstract
Domestication and breeding have created productive crops that are adapted to the climatic conditions of their growing regions. Initially, this process solely relied on the frequent occurrence of spontaneous mutations and the recombination of resultant gene variants. Later, treatments with ionizing radiation or mutagenic chemicals facilitated dramatically increased mutation rates, which remarkably extended the genetic diversity of crop plants. However, a major drawback of conventionally induced mutagenesis is that genetic alterations occur simultaneously across the whole genome and at very high numbers per individual plant. By contrast, the newly emerging Cas endonuclease technology allows for the induction of mutations at user-defined positions in the plant genome. In fundamental and breeding-oriented research, this opens up unprecedented opportunities for the elucidation of gene functions and the targeted improvement of plant performance. This review covers historical aspects of the development of customizable endonucleases, information on the mechanisms of targeted genome modification, as well as hitherto reported applications of Cas endonuclease technology in barley and wheat that are the agronomically most important members of the temperate cereals. Finally, current trends in the further development of this technology and some ensuing future opportunities for research and biotechnological application are presented.
Collapse
Affiliation(s)
- Iris Koeppel
- Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, 06466 Seeland, Germany.
| | - Christian Hertig
- Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, 06466 Seeland, Germany.
| | - Robert Hoffie
- Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, 06466 Seeland, Germany.
| | - Jochen Kumlehn
- Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, 06466 Seeland, Germany.
| |
Collapse
|
14
|
Abstract
Genome engineering involves methods of genetic modification of cells at predefined genomic sites. Here, we used transcription activator-like effector nucleases (TALENs) for the site-directed mutagenesis in barley. Target gene-specific TALEN-encoding expression units were designed and delivered to totipotent cells of either cultivated embryogenic pollen or immature embryos. The analysis of resulting transgenic plants revealed that the described approach allows for the generation of site-specific, heritable mutations at reasonable efficiency.
Collapse
Affiliation(s)
- Goetz Hensel
- Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, Seeland, Germany
| | - Jochen Kumlehn
- Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, Seeland, Germany.
| |
Collapse
|
15
|
Gasparis S, Kała M, Przyborowski M, Łyżnik LA, Orczyk W, Nadolska-Orczyk A. A simple and efficient CRISPR/Cas9 platform for induction of single and multiple, heritable mutations in barley ( Hordeum vulgare L.). PLANT METHODS 2018; 14:111. [PMID: 30568723 PMCID: PMC6297969 DOI: 10.1186/s13007-018-0382-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 12/10/2018] [Indexed: 05/04/2023]
Abstract
BACKGROUND Genome editing of monocot plants can be accomplished by using the components of the CRISPR/Cas9 (clustered regularly interspaced short palindromic repeat/CRISPR associated Cas9) technology specifically optimized for these types of plants. Here, we present the development of RNA-guided Cas9 system for simplex and multiplex genome editing in barley. RESULTS We developed a set of customizable RNA-guided Cas9 binary vectors and sgRNA modules for simplex and multiplex editing in barley. To facilitate the design of RNA-guided Cas9 constructs, the pBract derived binary vectors were adapted to Gateway cloning and only one restriction enzyme was required for construction of the sgRNA. We designed a synthetic, codon optimized Cas9 gene containing the N terminal SV40 nuclear localization signal and the UBQ10 Arabidopsis 1st intron. Two different sgRNAs were constructed for simplex editing and one polycistronic tRNA-gRNA construct (PTG) for multiplex editing using an endogenous tRNA processing system. The RNA-guided Cas9 constructs were validated in transgenic barley plants produced by Agrobacterium-mediated transformation. The highest mutation rate was observed in simplex editing of the cytokinin oxidase/dehydrogenase HvCKX1 gene, where mutations at the hvckx1 locus were detected in 88% of the screened T0 plants. We also proved the efficacy of the PTG construct in the multiplex editing of two CKX genes by obtaining 9 plants (21% of all edited plants) with mutations induced in both HvCKX1 and HvCKX3. Analysis of the T1 lines revealed that mutations in the HvCKX1 gene were transmitted to the next generation of plants. Among 220 screened T1 plants we identified 85 heterozygous and 28 homozygous mutants, most of them bearing frameshift mutations in the HvCKX1 gene. We also observed independent segregation of mutations and the Cas9-sgRNA T-DNA insert in several T1 plants. Moreover, the knockout mutations of the Nud gene generated phenotype mutants with naked grains, and the phenotypic changes were identifiable in T0 plants. CONCLUSIONS We demonstrated the effectiveness of an optimized RNA-guided Cas9 system that can be used for generating homozygous knockout mutants in the progeny of transgenic barely plants. This is also the first report of successful multiplex editing in barley using a tRNA processing system.
Collapse
Affiliation(s)
- Sebastian Gasparis
- Department of Functional Genomics, Plant Breeding and Acclimatization Institute – National Research Institute, 05-870 Radzików, Błonie, Poland
| | - Maciej Kała
- Department of Functional Genomics, Plant Breeding and Acclimatization Institute – National Research Institute, 05-870 Radzików, Błonie, Poland
| | - Mateusz Przyborowski
- Department of Functional Genomics, Plant Breeding and Acclimatization Institute – National Research Institute, 05-870 Radzików, Błonie, Poland
| | - Leszek A. Łyżnik
- Department of Plant Genetics, Breeding and Biotechnology, Warsaw University of Life Sciences (SGGW), 02-776 Warsaw, Poland
| | - Wacław Orczyk
- Department of Genetic Engineering, Plant Breeding and Acclimatization Institute – National Research Institute, 05-870 Radzików, Błonie, Poland
| | - Anna Nadolska-Orczyk
- Department of Functional Genomics, Plant Breeding and Acclimatization Institute – National Research Institute, 05-870 Radzików, Błonie, Poland
| |
Collapse
|
16
|
Ran Y, Patron N, Kay P, Wong D, Buchanan M, Cao Y, Sawbridge T, Davies JP, Mason J, Webb SR, Spangenberg G, Ainley WM, Walsh TA, Hayden MJ. Zinc finger nuclease-mediated precision genome editing of an endogenous gene in hexaploid bread wheat (Triticum aestivum) using a DNA repair template. PLANT BIOTECHNOLOGY JOURNAL 2018; 16:2088-2101. [PMID: 29734518 PMCID: PMC6230953 DOI: 10.1111/pbi.12941] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 04/03/2018] [Accepted: 04/17/2018] [Indexed: 05/07/2023]
Abstract
Sequence-specific nucleases have been used to engineer targeted genome modifications in various plants. While targeted gene knockouts resulting in loss of function have been reported with relatively high rates of success, targeted gene editing using an exogenously supplied DNA repair template and site-specific transgene integration has been more challenging. Here, we report the first application of zinc finger nuclease (ZFN)-mediated, nonhomologous end-joining (NHEJ)-directed editing of a native gene in allohexaploid bread wheat to introduce, via a supplied DNA repair template, a specific single amino acid change into the coding sequence of acetohydroxyacid synthase (AHAS) to confer resistance to imidazolinone herbicides. We recovered edited wheat plants having the targeted amino acid modification in one or more AHAS homoalleles via direct selection for resistance to imazamox, an AHAS-inhibiting imidazolinone herbicide. Using a cotransformation strategy based on chemical selection for an exogenous marker, we achieved a 1.2% recovery rate of edited plants having the desired amino acid change and a 2.9% recovery of plants with targeted mutations at the AHAS locus resulting in a loss-of-function gene knockout. The latter results demonstrate a broadly applicable approach to introduce targeted modifications into native genes for nonselectable traits. All ZFN-mediated changes were faithfully transmitted to the next generation.
Collapse
Affiliation(s)
- Yidong Ran
- Genovo Biotechnology Co. LtdTianjinChina
| | | | - Pippa Kay
- Department of Economic Development, Jobs, Transport and ResourcesCentre for AgriBioscienceAgriculture Victoria ResearchAgriBioBundooraVic.Australia
| | - Debbie Wong
- Department of Economic Development, Jobs, Transport and ResourcesCentre for AgriBioscienceAgriculture Victoria ResearchAgriBioBundooraVic.Australia
| | - Margaret Buchanan
- Department of Economic Development, Jobs, Transport and ResourcesCentre for AgriBioscienceAgriculture Victoria ResearchAgriBioBundooraVic.Australia
| | - Ying‐Ying Cao
- Department of Economic Development, Jobs, Transport and ResourcesCentre for AgriBioscienceAgriculture Victoria ResearchAgriBioBundooraVic.Australia
| | - Tim Sawbridge
- Department of Economic Development, Jobs, Transport and ResourcesCentre for AgriBioscienceAgriculture Victoria ResearchAgriBioBundooraVic.Australia
- School of Applied BiologyLa Trobe UniversityBundooraVic.Australia
| | | | - John Mason
- Department of Economic Development, Jobs, Transport and ResourcesCentre for AgriBioscienceAgriculture Victoria ResearchAgriBioBundooraVic.Australia
- School of Applied BiologyLa Trobe UniversityBundooraVic.Australia
| | | | - German Spangenberg
- Department of Economic Development, Jobs, Transport and ResourcesCentre for AgriBioscienceAgriculture Victoria ResearchAgriBioBundooraVic.Australia
- School of Applied BiologyLa Trobe UniversityBundooraVic.Australia
| | | | | | - Matthew J. Hayden
- Department of Economic Development, Jobs, Transport and ResourcesCentre for AgriBioscienceAgriculture Victoria ResearchAgriBioBundooraVic.Australia
- School of Applied BiologyLa Trobe UniversityBundooraVic.Australia
| |
Collapse
|
17
|
Miki D, Zhang W, Zeng W, Feng Z, Zhu JK. CRISPR/Cas9-mediated gene targeting in Arabidopsis using sequential transformation. Nat Commun 2018; 9:1967. [PMID: 29773790 PMCID: PMC5958078 DOI: 10.1038/s41467-018-04416-0] [Citation(s) in RCA: 134] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 04/26/2018] [Indexed: 12/31/2022] Open
Abstract
Homologous recombination-based gene targeting is a powerful tool for precise genome modification and has been widely used in organisms ranging from yeast to higher organisms such as Drosophila and mouse. However, gene targeting in higher plants, including the most widely used model plant Arabidopsis thaliana, remains challenging. Here we report a sequential transformation method for gene targeting in Arabidopsis. We find that parental lines expressing the bacterial endonuclease Cas9 from the egg cell- and early embryo-specific DD45 gene promoter can improve the frequency of single-guide RNA-targeted gene knock-ins and sequence replacements via homologous recombination at several endogenous sites in the Arabidopsis genome. These heritable gene targeting can be identified by regular PCR. Our approach enables routine and fine manipulation of the Arabidopsis genome.
Collapse
Affiliation(s)
- Daisuke Miki
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, 200032, Shanghai, China.
| | - Wenxin Zhang
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, 200032, Shanghai, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Wenjie Zeng
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, 200032, Shanghai, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Zhengyan Feng
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, 200032, Shanghai, China
| | - Jian-Kang Zhu
- Shanghai Center for Plant Stress Biology and Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, 200032, Shanghai, China.
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, 47907, USA.
| |
Collapse
|
18
|
Trait stacking in modern agriculture: application of genome editing tools. Emerg Top Life Sci 2017; 1:151-160. [PMID: 33525762 DOI: 10.1042/etls20170012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Revised: 09/05/2017] [Accepted: 09/07/2017] [Indexed: 11/17/2022]
Abstract
Advances in plant transgenic technology in the 20th century overcame the major hurdle for transfer of genetic material between species. This not only enabled fundamental insights into plant biology, but also revolutionized commercial agriculture. Adoption of transgenic plants in industrial agriculture has reduced pesticide application, while bringing significant increase in crop yields and farmers' profits. The progress made in transgenic technology over the last three decades paved the way mainly for simple single-gene insect and herbicide tolerance (HT) trait products. Modern agriculture demands stacking and pyramiding of complex traits that provide broad-spectrum insect and HT with other agronomic traits. In addition, more recent developments in genome editing provide unique opportunities to create precise on-demand genome modifications to enhance crop productivity. The major challenge for the plant biotech industry therefore remains to combine multiple forms of traits needed to create commercially viable stacked product. This review provides a historical perspective of conventional breeding stacks, current status of molecular stacks and future developments needed to enable genome-editing technology for trait stacking.
Collapse
|
19
|
AKBUDAK MA, KONTBAY K. Yeni Nesil Genom Düzenleme Teknikleri: ZFN, TALEN, CRISPR’lar ve Bitkilerde Kullanımı. ACTA ACUST UNITED AC 2017. [DOI: 10.21566/tarbitderg.323614] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
20
|
Malzahn A, Lowder L, Qi Y. Plant genome editing with TALEN and CRISPR. Cell Biosci 2017; 7:21. [PMID: 28451378 PMCID: PMC5404292 DOI: 10.1186/s13578-017-0148-4] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 04/19/2017] [Indexed: 11/10/2022] Open
Abstract
Genome editing promises giant leaps forward in advancing biotechnology, agriculture, and basic research. The process relies on the use of sequence specific nucleases (SSNs) to make DNA double stranded breaks at user defined genomic loci, which are subsequently repaired by two main DNA repair pathways: non-homologous end joining (NHEJ) and homology directed repair (HDR). NHEJ can result in frameshift mutations that often create genetic knockouts. These knockout lines are useful for functional and reverse genetic studies but also have applications in agriculture. HDR has a variety of applications as it can be used for gene replacement, gene stacking, and for creating various fusion proteins. In recent years, transcription activator-like effector nucleases and clustered regularly interspaced palindromic repeats (CRISPR) and CRISPR associated protein 9 or CRISPR from Prevotella and Francisella 1 have emerged as the preferred SSNs for research purposes. Here, we review their applications in plant research, discuss current limitations, and predict future research directions in plant genome editing.
Collapse
Affiliation(s)
- Aimee Malzahn
- Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742 USA
| | - Levi Lowder
- Department of Biology, East Carolina University, Greenville, NC 27858 USA
| | - Yiping Qi
- Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742 USA
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, MD 20850 USA
| |
Collapse
|
21
|
Horvath M, Steinbiss HH, Reiss B. Gene Targeting Without DSB Induction Is Inefficient in Barley. FRONTIERS IN PLANT SCIENCE 2017; 7:1973. [PMID: 28105032 PMCID: PMC5214849 DOI: 10.3389/fpls.2016.01973] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 12/13/2016] [Indexed: 05/29/2023]
Abstract
Double strand-break (DSB) induction allowed efficient gene targeting in barley (Hordeum vulgare), but little is known about efficiencies in its absence. To obtain such data, an assay system based on the acetolactate synthase (ALS) gene was established, a target gene which had been used previously in rice and Arabidopsis thaliana. Expression of recombinases RAD51 and RAD54 had been shown to improve gene targeting in A. thaliana and positive-negative (P-N) selection allows the routine production of targeted mutants without DSB induction in rice. We implemented these approaches in barley and analysed gene targeting with the ALS gene in wild type and RAD51 and RAD54 transgenic lines. In addition, P-N selection was tested. In contrast to the high gene targeting efficiencies obtained in the absence of DSB induction in A. thaliana or rice, not one single gene targeting event was obtained in barley. These data suggest that gene targeting efficiencies are very low in barley and can substantially differ between different plants, even at the same target locus. They also suggest that the amount of labour and time would become unreasonably high to use these methods as a tool in routine applications. This is particularly true since DSB induction offers efficient alternatives. Barley, unlike rice and A. thaliana has a large, complex genome, suggesting that genome size or complexity could be the reason for the low efficiencies. We discuss to what extent transformation methods, genome size or genome complexity could contribute to the striking differences in the gene targeting efficiencies between barley, rice and A. thaliana.
Collapse
Affiliation(s)
| | | | - Bernd Reiss
- Plant DNA Recombination Group, Max Planck Institute for Plant Breeding ResearchCologne, Germany
| |
Collapse
|
22
|
Hilscher J, Bürstmayr H, Stoger E. Targeted modification of plant genomes for precision crop breeding. Biotechnol J 2017; 12. [PMID: 27726285 DOI: 10.1002/biot.201600173] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 08/22/2016] [Accepted: 09/09/2016] [Indexed: 02/03/2023]
Abstract
The development of gene targeting and gene editing techniques based on programmable site-directed nucleases (SDNs) has increased the precision of genome modification and made the outcomes more predictable and controllable. These approaches have achieved rapid advances in plant biotechnology, particularly the development of improved crop varieties. Here, we review the range of alterations which have already been implemented in plant genomes, and summarize the reported efficiencies of precise genome modification. Many crop varieties are being developed using SDN technologies and although their regulatory status in the USA is clear there is still a decision pending in the EU. DNA-free genome editing strategies are briefly discussed because they also present a unique regulatory challenge. The potential applications of genome editing in plant breeding and crop improvement are highlighted by drawing examples from the recent literature.
Collapse
Affiliation(s)
- Julia Hilscher
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Hermann Bürstmayr
- Institute for Biotechnology in Plant Production (IFA Tulln), University of Natural Resources and Life Sciences, Tulln, Austria
| | - Eva Stoger
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| |
Collapse
|
23
|
Hisano H, Sato K. Genomic regions responsible for amenability to Agrobacterium-mediated transformation in barley. Sci Rep 2016; 6:37505. [PMID: 27874056 PMCID: PMC5118740 DOI: 10.1038/srep37505] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 10/28/2016] [Indexed: 11/09/2022] Open
Abstract
Different plant cultivars of the same genus and species can exhibit vastly different genetic transformation efficiencies. However, the genetic factors underlying these differences in transformation rate remain largely unknown. In barley, 'Golden Promise' is one of a few cultivars reliable for Agrobacterium-mediated transformation. By contrast, cultivar 'Haruna Nijo' is recalcitrant to genetic transformation. We identified genomic regions of barley important for successful transformation with Agrobacterium, utilizing the 'Haruna Nijo' × 'Golden Promise' F2 generation and genotyping by 124 genome-wide SNP markers. We observed significant segregation distortions of these markers from the expected 1:2:1 ratio toward the 'Golden Promise'-type in regions of chromosomes 2H and 3H, indicating that the alleles of 'Golden Promise' in these regions might contribute to transformation efficiency. The same regions, which we termed Transformation Amenability (TFA) regions, were also conserved in transgenic F2 plants generated from a 'Morex' × 'Golden Promise' cross. The genomic regions identified herein likely include necessary factors for Agrobacterium-mediated transformation in barley. The potential to introduce these loci into any haplotype of barley opens the door to increasing the efficiency of transformation for target alleles into any haplotype of barley by the TFA-based methods proposed in this report.
Collapse
Affiliation(s)
- Hiroshi Hisano
- Institute of Plant Science and Resources, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama 710-0046 Japan
| | - Kazuhiro Sato
- Institute of Plant Science and Resources, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama 710-0046 Japan
| |
Collapse
|
24
|
Cardi T, Neal Stewart C. Progress of targeted genome modification approaches in higher plants. PLANT CELL REPORTS 2016; 35:1401-16. [PMID: 27025856 DOI: 10.1007/s00299-016-1975-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 03/21/2016] [Indexed: 05/07/2023]
Abstract
Transgene integration in plants is based on illegitimate recombination between non-homologous sequences. The low control of integration site and number of (trans/cis)gene copies might have negative consequences on the expression of transferred genes and their insertion within endogenous coding sequences. The first experiments conducted to use precise homologous recombination for gene integration commenced soon after the first demonstration that transgenic plants could be produced. Modern transgene targeting categories used in plant biology are: (a) homologous recombination-dependent gene targeting; (b) recombinase-mediated site-specific gene integration; (c) oligonucleotide-directed mutagenesis; (d) nuclease-mediated site-specific genome modifications. New tools enable precise gene replacement or stacking with exogenous sequences and targeted mutagenesis of endogeneous sequences. The possibility to engineer chimeric designer nucleases, which are able to target virtually any genomic site, and use them for inducing double-strand breaks in host DNA create new opportunities for both applied plant breeding and functional genomics. CRISPR is the most recent technology available for precise genome editing. Its rapid adoption in biological research is based on its inherent simplicity and efficacy. Its utilization, however, depends on available sequence information, especially for genome-wide analysis. We will review the approaches used for genome modification, specifically those for affecting gene integration and modification in higher plants. For each approach, the advantages and limitations will be noted. We also will speculate on how their actual commercial development and implementation in plant breeding will be affected by governmental regulations.
Collapse
Affiliation(s)
- Teodoro Cardi
- Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca per l'Orticoltura, Via Cavalleggeri 25, 84098, Pontecagnano, Italy.
| | - C Neal Stewart
- Department of Plant Sciences, University of Tennessee, Knoxville, TN, 37996, USA
| |
Collapse
|
25
|
Abstract
Transcription activator-like effector nucleases (TALENs) are one of several types of programmable, engineered nucleases that bind and cleave specific DNA sequences. Cellular machinery repairs the cleaved DNA by introducing indels. In this review, we emphasize the potential, explore progress, and identify challenges in using TALENs as a therapeutic tool to treat HIV infection. TALENs have less off-target editing and can be more effective at tolerating HIV escape mutations than CRISPR/Cas-9. Scientists have explored TALEN-mediated editing of host genes such as viral entry receptors (CCR5 and CXCR4) and a protein involved in proviral integration (LEDGF/p75). Viral targets include the proviral DNA, particularly focused on the long terminal repeats. Major challenges with translating gene therapy from bench to bedside are improving cleavage efficiency and delivery, while minimizing off-target editing, cytotoxicity, and immunogenicity. However, rapid improvements in TALEN technology are enhancing cleavage efficiency and specificity. Therapeutic testing in animal models of HIV infection will help determine whether TALENs are a viable HIV treatment therapy. TALENs or other engineered nucleases could shift the therapeutic paradigm from life-long antiretroviral therapy toward eradication of HIV infection.
Collapse
|
26
|
Sun Y, Li J, Xia L. Precise Genome Modification via Sequence-Specific Nucleases-Mediated Gene Targeting for Crop Improvement. FRONTIERS IN PLANT SCIENCE 2016; 7:1928. [PMID: 28066481 PMCID: PMC5167731 DOI: 10.3389/fpls.2016.01928] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 12/05/2016] [Indexed: 05/17/2023]
Abstract
Genome editing technologies enable precise modifications of DNA sequences in vivo and offer a great promise for harnessing plant genes in crop improvement. The precise manipulation of plant genomes relies on the induction of DNA double-strand breaks by sequence-specific nucleases (SSNs) to initiate DNA repair reactions that are based on either non-homologous end joining (NHEJ) or homology-directed repair (HDR). While complete knock-outs and loss-of-function mutations generated by NHEJ are very valuable in defining gene functions, their applications in crop improvement are somewhat limited because many agriculturally important traits are conferred by random point mutations or indels at specific loci in either the genes' encoding or promoter regions. Therefore, genome modification through SSNs-mediated HDR for gene targeting (GT) that enables either gene replacement or knock-in will provide an unprecedented ability to facilitate plant breeding by allowing introduction of precise point mutations and new gene functions, or integration of foreign genes at specific and desired "safe" harbor in a predefined manner. The emergence of three programmable SSNs, such as zinc finger nucleases, transcriptional activator-like effector nucleases, and the clustered regularly interspaced short palindromic repeat (CRISPR)/CRISPR-associated protein 9 (Cas9) systems has revolutionized genome modification in plants in a more controlled manner. However, while targeted mutagenesis is becoming routine in plants, the potential of GT technology has not been well realized for traits improvement in crops, mainly due to the fact that NHEJ predominates DNA repair process in somatic cells and competes with the HDR pathway, and thus HDR-mediated GT is a relative rare event in plants. Here, we review recent research findings mainly focusing on development and applications of precise GT in plants using three SSNs systems described above, and the potential mechanisms underlying HDR events in plant cells. We then address the challenges and propose future perspectives in order to facilitate the implementation of precise genome modification through SSNs-mediated GT for crop improvement in a global context.
Collapse
|
27
|
Budhagatapalli N, Schedel S, Gurushidze M, Pencs S, Hiekel S, Rutten T, Kusch S, Morbitzer R, Lahaye T, Panstruga R, Kumlehn J, Hensel G. A simple test for the cleavage activity of customized endonucleases in plants. PLANT METHODS 2016; 12:18. [PMID: 26962325 PMCID: PMC4784412 DOI: 10.1186/s13007-016-0118-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 02/24/2016] [Indexed: 05/20/2023]
Abstract
BACKGROUND Although customized endonucleases [transcription activator-like effector nucleases (TALENs) and RNA-guided endonucleases (RGENs)] are known to be effective agents of mutagenesis in various host plants, newly designed endonuclease constructs require some pre-validation with respect to functionality before investing in the creation of stable transgenic plants. RESULTS A simple, biolistics-based leaf epidermis transient expression test has been developed, based on reconstituting the translational reading frame of a mutated, non-functional yfp reporter gene. Quantification of mutation efficacy was made possible by co-bombarding the explant with a constitutive mCherry expression cassette, thereby allowing the ratio between the number of red and yellow fluorescing cells to serve as a metric for mutation efficiency. Challenging either stable mutant alleles of a compromised version of gfp in tobacco and barley or the barley MLO gene with TALENs/RGENs confirmed the capacity to induce site-directed mutations. CONCLUSIONS A convenient procedure to assay the cleavage activity of customized endonucleases has been established. The system is independent of the endonuclease platform and operates in both di- and monocotyledonous hosts. It not only enables the validation of a TALEN/RGEN's functionality prior to the creation of stable mutants, but also serves as a suitable tool to optimize the design of endonuclease constructs.
Collapse
Affiliation(s)
- Nagaveni Budhagatapalli
- />Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland/OT Gatersleben, Germany
| | - Sindy Schedel
- />Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland/OT Gatersleben, Germany
| | - Maia Gurushidze
- />Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland/OT Gatersleben, Germany
| | - Stefanie Pencs
- />Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland/OT Gatersleben, Germany
- />Chair of Plant Breeding, Martin Luther University, Betty-Heimann-Str. 3, 06120 Halle (Saale), Germany
| | - Stefan Hiekel
- />Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland/OT Gatersleben, Germany
| | - Twan Rutten
- />Structural Cell Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland/OT Gatersleben, Germany
| | - Stefan Kusch
- />Unit of Plant Molecular Cell Biology, Institute for Biology I, RWTH Aachen University, Worringerweg 1, 52056 Aachen, Germany
| | - Robert Morbitzer
- />ZMBP-General Genetics, University of Tübingen, Auf der Morgenstelle 32, 72076 Tübingen, Germany
| | - Thomas Lahaye
- />ZMBP-General Genetics, University of Tübingen, Auf der Morgenstelle 32, 72076 Tübingen, Germany
| | - Ralph Panstruga
- />Unit of Plant Molecular Cell Biology, Institute for Biology I, RWTH Aachen University, Worringerweg 1, 52056 Aachen, Germany
| | - Jochen Kumlehn
- />Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland/OT Gatersleben, Germany
| | - Goetz Hensel
- />Plant Reproductive Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland/OT Gatersleben, Germany
| |
Collapse
|