1
|
Yang Y, Wheatley M, Meakem V, Galarneau E, Gutierrez B, Zhong G. Editing VvDXS1 for the creation of muscat flavour in Vitis vinifera cv. Scarlet Royal. PLANT BIOTECHNOLOGY JOURNAL 2024; 22:1610-1621. [PMID: 38243882 PMCID: PMC11123410 DOI: 10.1111/pbi.14290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 12/01/2023] [Accepted: 01/04/2024] [Indexed: 01/22/2024]
Abstract
Muscat flavour represents a group of unique aromatic attributes in some grape varieties. Biochemically, grape berries with muscat flavour produce high levels of monoterpenes. Monoterpene biosynthesis is mainly through the DOXP/MEP pathway, and VvDXS1 encodes the first enzyme in this plastidial pathway of terpene biosynthesis in grapevine. A single-point mutation resulting in the substitution of a lysine with an asparagine at position 284 in the VvDXS1 protein has previously been identified as the major cause for producing muscat flavour in grapes. In this study, the same substitution in the VvDXS1 protein was successfully created through prime editing in the table grape Vitis vinifera cv. 'Scarlet Royal'. The targeted point mutation was detected in most of the transgenic vines, with varying editing efficiencies. No unintended mutations were detected in the edited alleles, either by PCR Sanger sequencing or by amplicon sequencing. More than a dozen edited vines were identified with an editing efficiency of more than 50%, indicating that these vines were likely derived from single cells in which one allele was edited. These vines had much higher levels of monoterpenes in their leaves than the control, similar to what was found in leaf samples between field-grown muscat and non-muscat grapes.
Collapse
Affiliation(s)
- Yingzhen Yang
- USDA‐Agricultural Research ServiceGrape Genetics Research UnitGenevaNew YorkUSA
| | - Matthew Wheatley
- USDA‐Agricultural Research ServiceGrape Genetics Research UnitGenevaNew YorkUSA
| | - Victoria Meakem
- USDA‐Agricultural Research ServicePlant Genetic Resources UnitGenevaNew YorkUSA
| | - Erin Galarneau
- USDA‐Agricultural Research ServicePlant Genetic Resources UnitGenevaNew YorkUSA
| | - Benjamin Gutierrez
- USDA‐Agricultural Research ServicePlant Genetic Resources UnitGenevaNew YorkUSA
| | - Gan‐Yuan Zhong
- USDA‐Agricultural Research ServiceGrape Genetics Research UnitGenevaNew YorkUSA
| |
Collapse
|
2
|
Liu X, Gu D, Zhang Y, Jiang Y, Xiao Z, Xu R, Qin R, Li J, Wei P. Conditional knockdown of OsMLH1 to improve plant prime editing systems without disturbing fertility in rice. Genome Biol 2024; 25:131. [PMID: 38773623 PMCID: PMC11110357 DOI: 10.1186/s13059-024-03282-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2024] [Accepted: 05/16/2024] [Indexed: 05/24/2024] Open
Abstract
BACKGROUND High-efficiency prime editing (PE) is desirable for precise genome manipulation. The activity of mammalian PE systems can be largely improved by inhibiting DNA mismatch repair by coexpressing a dominant-negative variant of MLH1. However, this strategy has not been widely used for PE optimization in plants, possibly because of its less conspicuous effects and inconsistent performance at different sites. RESULTS We show that direct RNAi knockdown of OsMLH1 in an ePE5c system increases the efficiency of our most recently updated PE tool by 1.30- to 2.11-fold in stably transformed rice cells, resulting in as many as 85.42% homozygous mutants in the T0 generation. The high specificity of ePE5c is revealed by whole-genome sequencing. To overcome the partial sterility induced by OsMLH1 knockdown of ePE5c, a conditional excision system is introduced to remove the RNAi module by Cre-mediated site-specific recombination. Using a simple approach of enriching excision events, we generate 100% RNAi module-free plants in the T0 generation. The increase in efficiency due to OsMLH1 knockdown is maintained in the excised plants, whose fertility is not impaired. CONCLUSIONS This study provides a safe and reliable plant PE optimization strategy for improving editing efficiency without disturbing plant development via transient MMR inhibition with an excisable RNAi module of MLH1.
Collapse
Affiliation(s)
- Xiaoshuang Liu
- College of Agronomy, Anhui Agricultural University, Hefei, 230036, People's Republic of China
| | - Dongfang Gu
- Rice Research Institute, Anhui Academy of Agricultural Sciences, Hefei, 230031, People's Republic of China
| | - Yiru Zhang
- College of Agronomy, Anhui Agricultural University, Hefei, 230036, People's Republic of China
| | - Yingli Jiang
- College of Agronomy, Anhui Agricultural University, Hefei, 230036, People's Republic of China
| | - Zhi Xiao
- College of Agronomy, Anhui Agricultural University, Hefei, 230036, People's Republic of China
| | - Rongfang Xu
- Rice Research Institute, Anhui Academy of Agricultural Sciences, Hefei, 230031, People's Republic of China
| | - Ruiying Qin
- Rice Research Institute, Anhui Academy of Agricultural Sciences, Hefei, 230031, People's Republic of China
| | - Juan Li
- Rice Research Institute, Anhui Academy of Agricultural Sciences, Hefei, 230031, People's Republic of China.
| | - Pengcheng Wei
- College of Agronomy, Anhui Agricultural University, Hefei, 230036, People's Republic of China.
- Research Centre for Biological Breeding Technology, Advance Academy, Anhui Agricultural University, Hefei, 230036, People's Republic of China.
| |
Collapse
|
3
|
Li B, Sun C, Li J, Gao C. Targeted genome-modification tools and their advanced applications in crop breeding. Nat Rev Genet 2024:10.1038/s41576-024-00720-2. [PMID: 38658741 DOI: 10.1038/s41576-024-00720-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2024] [Indexed: 04/26/2024]
Abstract
Crop improvement by genome editing involves the targeted alteration of genes to improve plant traits, such as stress tolerance, disease resistance or nutritional content. Techniques for the targeted modification of genomes have evolved from generating random mutations to precise base substitutions, followed by insertions, substitutions and deletions of small DNA fragments, and are finally starting to achieve precision manipulation of large DNA segments. Recent developments in base editing, prime editing and other CRISPR-associated systems have laid a solid technological foundation to enable plant basic research and precise molecular breeding. In this Review, we systematically outline the technological principles underlying precise and targeted genome-modification methods. We also review methods for the delivery of genome-editing reagents in plants and outline emerging crop-breeding strategies based on targeted genome modification. Finally, we consider potential future developments in precise genome-editing technologies, delivery methods and crop-breeding approaches, as well as regulatory policies for genome-editing products.
Collapse
Affiliation(s)
- Boshu Li
- New Cornerstone Science Laboratory, Center for Genome Editing, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Chao Sun
- New Cornerstone Science Laboratory, Center for Genome Editing, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Jiayang Li
- Hainan Yazhou Bay Seed Laboratory, Sanya, China
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Caixia Gao
- New Cornerstone Science Laboratory, Center for Genome Editing, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China.
| |
Collapse
|
4
|
A prime editor that makes space for insertions. Nat Methods 2024; 21:383-384. [PMID: 38302660 DOI: 10.1038/s41592-023-02163-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
|
5
|
Truong DJJ, Geilenkeuser J, Wendel SV, Wilming JCH, Armbrust N, Binder EMH, Santl TH, Siebenhaar A, Gruber C, Phlairaharn T, Živanić M, Westmeyer GG. Exonuclease-enhanced prime editors. Nat Methods 2024; 21:455-464. [PMID: 38302659 PMCID: PMC10927552 DOI: 10.1038/s41592-023-02162-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 12/19/2023] [Indexed: 02/03/2024]
Abstract
Prime editing (PE) is a powerful gene-editing technique based on targeted gRNA-templated reverse transcription and integration of the de novo synthesized single-stranded DNA. To circumvent one of the main bottlenecks of the method, the competition of the reverse-transcribed 3' flap with the original 5' flap DNA, we generated an enhanced fluorescence-activated cell sorting reporter cell line to develop an exonuclease-enhanced PE strategy ('Exo-PE') composed of an improved PE complex and an aptamer-recruited DNA-exonuclease to remove the 5' original DNA flap. Exo-PE achieved better overall editing efficacy than the reference PE2 strategy for insertions ≥30 base pairs in several endogenous loci and cell lines while maintaining the high editing precision of PE2. By enabling the precise incorporation of larger insertions, Exo-PE complements the growing palette of different PE tools and spurs additional refinements of the PE machinery.
Collapse
Affiliation(s)
- Dong-Jiunn Jeffery Truong
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Julian Geilenkeuser
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Stephanie Victoria Wendel
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Julius Clemens Heinrich Wilming
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Niklas Armbrust
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Eva Maria Hildegard Binder
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Tobias Heinrich Santl
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Annika Siebenhaar
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Christoph Gruber
- Institute of Developmental Genetics, Helmholtz Munich, Neuherberg, Germany
| | - Teeradon Phlairaharn
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Milica Živanić
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany
| | - Gil Gregor Westmeyer
- Institute for Synthetic Biomedicine, Helmholtz Munich, Neuherberg, Germany.
- Department of Bioscience, TUM School of Natural Sciences and TUM School of Medicine,Technical University of Munich, Munich, Germany.
| |
Collapse
|
6
|
Vu TV, Nguyen NT, Kim J, Hong JC, Kim J. Prime editing: Mechanism insight and recent applications in plants. PLANT BIOTECHNOLOGY JOURNAL 2024; 22:19-36. [PMID: 37794706 PMCID: PMC10754014 DOI: 10.1111/pbi.14188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 09/14/2023] [Accepted: 09/18/2023] [Indexed: 10/06/2023]
Abstract
Prime editing (PE) technology utilizes an extended prime editing guide RNA (pegRNA) to direct a fusion peptide consisting of nCas9 (H840) and reverse transcriptase (RT) to a specific location in the genome. This enables the installation of base changes at the targeted site using the extended portion of the pegRNA through RT activity. The resulting product of the RT reaction forms a 3' flap, which can be incorporated into the genomic site through a series of biochemical steps involving DNA repair and synthesis pathways. PE has demonstrated its effectiveness in achieving almost all forms of precise gene editing, such as base conversions (all types), DNA sequence insertions and deletions, chromosomal translocation and inversion and long DNA sequence insertion at safe harbour sites within the genome. In plant science, PE could serve as a groundbreaking tool for precise gene editing, allowing the creation of desired alleles to improve crop varieties. Nevertheless, its application has encountered limitations due to efficiency constraints, particularly in dicotyledonous plants. In this review, we discuss the step-by-step mechanism of PE, shedding light on the critical aspects of each step while suggesting possible solutions to enhance its efficiency. Additionally, we present an overview of recent advancements and future perspectives in PE research specifically focused on plants, examining the key technical considerations of its applications.
Collapse
Affiliation(s)
- Tien V. Vu
- Division of Applied Life Science (BK21 Four Program), Plant Molecular Biology and Biotechnology Research CenterGyeongsang National UniversityJinjuKorea
| | - Ngan Thi Nguyen
- Division of Applied Life Science (BK21 Four Program), Plant Molecular Biology and Biotechnology Research CenterGyeongsang National UniversityJinjuKorea
| | - Jihae Kim
- Division of Applied Life Science (BK21 Four Program), Plant Molecular Biology and Biotechnology Research CenterGyeongsang National UniversityJinjuKorea
| | - Jong Chan Hong
- Division of Applied Life Science (BK21 Four Program), Plant Molecular Biology and Biotechnology Research CenterGyeongsang National UniversityJinjuKorea
| | - Jae‐Yean Kim
- Division of Applied Life Science (BK21 Four Program), Plant Molecular Biology and Biotechnology Research CenterGyeongsang National UniversityJinjuKorea
- Division of Life ScienceGyeongsang National UniversityJinjuKorea
- Nulla Bio Inc.JinjuKorea
| |
Collapse
|