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Somoza SC, Bonfante P, Giovannetti M. Breaking barriers: improving time and space resolution of arbuscular mycorrhizal symbiosis with single-cell sequencing approaches. Biol Direct 2024; 19:67. [PMID: 39154166 PMCID: PMC11330620 DOI: 10.1186/s13062-024-00501-1] [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: 05/02/2024] [Accepted: 07/11/2024] [Indexed: 08/19/2024] Open
Abstract
The cell and molecular bases of arbuscular mycorrhizal (AM) symbiosis, a crucial plant-fungal interaction for nutrient acquisition, have been extensively investigated by coupling traditional RNA sequencing techniques of roots sampled in bulk, with methods to capture subsets of cells such as laser microdissection. These approaches have revealed central regulators of this complex relationship, yet the requisite level of detail to effectively untangle the intricacies of temporal and spatial development remains elusive.The recent adoption of single-cell RNA sequencing (scRNA-seq) techniques in plant research is revolutionizing our ability to dissect the intricate transcriptional profiles of plant-microbe interactions, offering unparalleled insights into the diversity and dynamics of individual cells during symbiosis. The isolation of plant cells is particularly challenging due to the presence of cell walls, leading plant researchers to widely adopt nuclei isolation methods. Despite the increased resolution that single-cell analyses offer, it also comes at the cost of spatial perspective, hence, it is necessary the integration of these approaches with spatial transcriptomics to obtain a comprehensive overview.To date, few single-cell studies on plant-microbe interactions have been published, most of which provide high-resolution cell atlases that will become crucial for fully deciphering symbiotic interactions and addressing future questions. In AM symbiosis research, key processes such as the mutual recognition of partners during arbuscule development within cortical cells, or arbuscule senescence and degeneration, remain poorly understood, and these advancements are expected to shed light on these processes and contribute to a deeper understanding of this plant-fungal interaction.
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Affiliation(s)
| | - Paola Bonfante
- Department of Life Sciences and Systems Biology, University of Torino, Torino, 10125, Italy
| | - Marco Giovannetti
- Department of Biology, University of Padova, Padova, 35131, Italy.
- Department of Life Sciences and Systems Biology, University of Torino, Torino, 10125, Italy.
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Perroud PF, Guyon-Debast A, Casacuberta JM, Paul W, Pichon JP, Comeau D, Nogué F. Improved prime editing allows for routine predictable gene editing in Physcomitrium patens. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:6176-6187. [PMID: 37243510 PMCID: PMC10575697 DOI: 10.1093/jxb/erad189] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 05/25/2023] [Indexed: 05/29/2023]
Abstract
Efficient and precise gene editing is the gold standard of any reverse genetic study. The recently developed prime editing approach, a modified CRISPR/Cas9 [clustered regularly interspaced palindromic repeats (CRISPR)/CRISPR-associated protein] editing method, has reached the precision goal but its editing rate can be improved. We present an improved methodology that allows for routine prime editing in the model plant Physcomitrium patens, whilst exploring potential new prime editing improvements. Using a standardized protoplast transfection procedure, multiple prime editing guide RNA (pegRNA) structural and prime editor variants were evaluated targeting the APT reporter gene through direct plant selection. Together, enhancements of expression of the prime editor, modifications of the 3' extension of the pegRNA, and the addition of synonymous mutation in the reverse transcriptase template sequence of the pegRNA dramatically improve the editing rate without affecting the quality of the edits. Furthermore, we show that prime editing is amenable to edit a gene of interest through indirect selection, as demonstrated by the generation of a Ppdek10 mutant. Additionally, we determine that a plant retrotransposon reverse transcriptase enables prime editing. Finally, we show for the first time the possibility of performing prime editing with two independently coded peptides.
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Affiliation(s)
- Pierre-François Perroud
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France
| | - Anouchka Guyon-Debast
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France
| | - Josep M Casacuberta
- Centre for Research in Agricultural Genomics CSIC-IRTA-UAB-UB, Campus UAB, Edifici CRAG, Bellaterra, 08193 Barcelona, Spain
| | - Wyatt Paul
- Limagrain Europe, Centre de Recherche de Chappes, 63720 Chappes, France
| | | | - David Comeau
- Limagrain Europe, Centre de Recherche de Chappes, 63720 Chappes, France
| | - Fabien Nogué
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France
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Garcias-Morales D, Palomar VM, Charlot F, Nogué F, Covarrubias AA, Reyes JL. N 6 -Methyladenosine modification of mRNA contributes to the transition from 2D to 3D growth in the moss Physcomitrium patens. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023; 114:7-22. [PMID: 36794900 DOI: 10.1111/tpj.16149] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 02/07/2023] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
Plants colonized the land approximately 470 million years ago, coinciding with the development of apical cells that divide in three planes. The molecular mechanisms that underly the development of the 3D growth pattern are poorly understood, mainly because 3D growth in seed plants starts during embryo development. In contrast, the transition from 2D to 3D growth in the moss Physcomitrium patens has been widely studied, and it involves a large turnover of the transcriptome to allow the establishment of stage-specific transcripts that facilitate this developmental transition. N6 -Methyladenosine (m6 A) is the most abundant, dynamic and conserved internal nucleotide modification present on eukaryotic mRNA and serves as a layer of post-transcriptional regulation directly affecting several cellular processes and developmental pathways in many organisms. In Arabidopsis, m6 A has been reported to be essential for organ growth and determination, embryo development and responses to environmental signals. In this study, we identified the main genes of the m6 A methyltransferase complex (MTC), MTA, MTB and FIP37, in P. patens and demonstrate that their inactivation leads to the loss of m6 A in mRNA, a delay in the formation of gametophore buds and defects in spore development. Genome-wide analysis revealed several transcripts affected in the Ppmta background. We demonstrate that the PpAPB1-PpAPB4 transcripts, encoding central factors orchestrating the transition from 2D to 3D growth in P. patens, are modified by m6 A, whereas in the Ppmta mutant the lack of the m6 A marker is associated with a corresponding decrease in transcript accumulation. Overall, we suggest that m6 A is essential to enable the proper accumulation of these and other bud-specific transcripts directing the turnover of stage-specific transcriptomes, and thus promoting the transition from protonema to gametophore buds in P. patens.
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Affiliation(s)
- David Garcias-Morales
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, UNAM, Av. Universidad 2001, Cuernavaca, CP, 62210, Mexico
| | - V Miguel Palomar
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, 1105 N. University Ave, Ann Arbor, MI, 48109-1085, USA
| | - Florence Charlot
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Fabien Nogué
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Alejandra A Covarrubias
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, UNAM, Av. Universidad 2001, Cuernavaca, CP, 62210, Mexico
| | - José L Reyes
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, UNAM, Av. Universidad 2001, Cuernavaca, CP, 62210, Mexico
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Beraldo C, Guyon-Debast A, Alboresi A, Nogué F, Morosinotto T. Functional analysis of PsbS transmembrane domains through base editing in Physcomitrium patens. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023; 113:1049-1061. [PMID: 36606401 DOI: 10.1111/tpj.16099] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 12/27/2022] [Accepted: 01/03/2023] [Indexed: 06/17/2023]
Abstract
Plants exposed to light fluctuations are protected from photodamage by non-photochemical quenching (NPQ), a reversible mechanism that enables dissipation of excess absorbed energy as heat, which is essential for plant fitness and crop productivity. In plants NPQ requires the presence of the membrane protein PsbS, which upon activation interacts with antenna proteins, inducing their dissipative conformation. Here, we exploited base editing (BE) in the moss Physcomitrium patens to introduce specific amino acid changes in vivo and assess their impact on PsbS activity, targeting transmembrane regions to investigate their role in essential protein-protein interactions. This approach enabled the recognition of residues essential for protein stability and the identification of a hydrophobic cluster of amino acids impacting PsbS activity. This work provides new information on the molecular mechanism of PsbS while also demonstrating the potential of BE approaches for in planta gene function analysis.
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Affiliation(s)
- Claudia Beraldo
- Department of Biology, University of Padova, Via Ugo Bassi 58B, Padova, 35131, Italy
| | - Anouchka Guyon-Debast
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Alessandro Alboresi
- Department of Biology, University of Padova, Via Ugo Bassi 58B, Padova, 35131, Italy
| | - Fabien Nogué
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Tomas Morosinotto
- Department of Biology, University of Padova, Via Ugo Bassi 58B, Padova, 35131, Italy
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Optimization of Isolation and Transformation of Protoplasts from Uncaria rhynchophylla and Its Application to Transient Gene Expression Analysis. Int J Mol Sci 2023; 24:ijms24043633. [PMID: 36835049 PMCID: PMC9962833 DOI: 10.3390/ijms24043633] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/02/2023] [Accepted: 02/10/2023] [Indexed: 02/16/2023] Open
Abstract
Protoplast-based engineering has become an important tool for basic plant molecular biology research and developing genome-edited crops. Uncaria rhynchophylla is a traditional Chinese medicinal plant with a variety of pharmaceutically important indole alkaloids. In this study, an optimized protocol for U. rhynchophylla protoplast isolation, purification, and transient gene expression was developed. The best protoplast separation protocol was found to be 0.8 M D-mannitol, 1.25% Cellulase R-10, and 0.6% Macerozyme R-10 enzymolysis for 5 h at 26 °C in the dark with constant oscillation at 40 rpm/min. The protoplast yield was as high as 1.5 × 107 protoplasts/g fresh weight, and the survival rate of protoplasts was greater than 90%. Furthermore, polyethylene glycol (PEG)-mediated transient transformation of U. rhynchophylla protoplasts was investigated by optimizing different crucial factors affecting transfection efficiency, including plasmid DNA amount, PEG concentration, and transfection duration. The U. rhynchophylla protoplast transfection rate was highest (71%) when protoplasts were transfected overnight at 24 °C with the 40 µg of plasmid DNA for 40 min in a solution containing 40% PEG. This highly efficient protoplast-based transient expression system was used for subcellular localization of transcription factor UrWRKY37. Finally, a dual-luciferase assay was used to detect a transcription factor promoter interaction by co-expressing UrWRKY37 with a UrTDC-promoter reporter plasmid. Taken together, our optimized protocols provide a foundation for future molecular studies of gene function and expression in U. rhynchophylla.
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Genome-wide specificity of plant genome editing by both CRISPR-Cas9 and TALEN. Sci Rep 2022; 12:9330. [PMID: 35665758 PMCID: PMC9167288 DOI: 10.1038/s41598-022-13034-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 05/19/2022] [Indexed: 12/25/2022] Open
Abstract
CRISPR and TALENs are efficient systems for gene editing in many organisms including plants. In many cases the CRISPR–Cas or TALEN modules are expressed in the plant cell only transiently. Theoretically, transient expression of the editing modules should limit unexpected effects compared to stable transformation. However, very few studies have measured the off-target and unpredicted effects of editing strategies on the plant genome, and none of them have compared these two major editing systems. We conducted, in Physcomitrium patens, a comprehensive genome-wide investigation of off-target mutations using either a CRISPR–Cas9 or a TALEN strategy. We observed a similar number of differences for the two editing strategies compared to control non-transfected plants, with an average of 8.25 SNVs and 19.5 InDels for the CRISPR-edited plants, and an average of 17.5 SNVs and 32 InDels for the TALEN-edited plants. Interestingly, a comparable number of SNVs and InDels could be detected in the PEG-treated control plants. This shows that except for the on-target modifications, the gene editing tools used in this study did not show a significant off-target activity nor unpredicted effects on the genome, and did not lead to transgene integration. The PEG treatment, a well-established biotechnological method, in itself, was the main source of mutations found in the edited plants.
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Perroud PF, Guyon-Debast A, Veillet F, Kermarrec MP, Chauvin L, Chauvin JE, Gallois JL, Nogué F. Prime Editing in the model plant Physcomitrium patens and its potential in the tetraploid potato. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2022; 316:111162. [PMID: 35151447 DOI: 10.1016/j.plantsci.2021.111162] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 12/03/2021] [Accepted: 12/19/2021] [Indexed: 06/14/2023]
Abstract
Since its discovery and first applications for genome editing in plants, the clustered regularly interspaced short palindromic repeats (CRISPR)-Cas9 technology has revolutionized plant research and precision crop breeding. Although the classical CRISPR-Cas9 system is a highly efficient tool for disruptive targeted mutagenesis, this system is mostly inefficient for the introduction of precise and predictable nucleotide substitutions. Recently, Prime Editing technology has been developed, allowing the simultaneous generation of nucleotide transitions and transversions but also short defined indels. In this study, we report on the successful use of Prime Editing in two plants of interest: the plant model Physcomitrium patens and the tetraploid and highly heterozygous potato (Solanum tuberosum). In both cases editing rates were lower than with other CRISPR-Cas9 based techniques, but we were able to successfully introduce nucleotide transversions into targeted genes, a unique feature of Prime Editing. Additionally, the analysis of potential off-target mutation sites in P. patens suggested very high targeting fidelity in this organism. The present work paves the way for the use Prime Editing in Physcomitrium patens and potato, however highlighting the limitations that need to be overcome for more efficient precision plant breeding.
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Affiliation(s)
- Pierre-François Perroud
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000, Versailles, France.
| | - Anouchka Guyon-Debast
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000, Versailles, France
| | - Florian Veillet
- IGEPP, INRAE, Institut Agro, Univ Rennes, 29260, Ploudaniel, France
| | | | - Laura Chauvin
- IGEPP, INRAE, Institut Agro, Univ Rennes, 29260, Ploudaniel, France
| | | | | | - Fabien Nogué
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000, Versailles, France
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