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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. J Exp Bot 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] [What about the content of this article? (0)] [Affiliation(s)] [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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Pugh E, Fonfara S, Appleby R, Comeau D, Minors S, Singh A. Intrapericardial neuroendocrine tumour in a dog. J Vet Cardiol 2021; 39:63-68. [PMID: 34979483 DOI: 10.1016/j.jvc.2021.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 12/06/2021] [Accepted: 12/07/2021] [Indexed: 11/19/2022]
Abstract
An 11-year-old neutered male Border Terrier presented for pericardiectomy after a nine-month history of tricavitary effusion, dyspnoea and lethargy. Transthoracic echocardiography revealed a fluid-filled structure at the heart base, starting at the mid-right ventricle and extending to the middle of the right atrium. Almost complete compression of the right atrium and the cranial vena cava was noted. Thoracic computed tomography revealed a heterogeneously enhancing and poorly marginated mass within the cranial aspect of the pericardium. A median sternotomy and subtotal pericardiectomy were performed. A non-distinct fluid-filled structure within the pericardium adhered to the epicardium was visualised. The structure was removed via marsupialisation along with extirpation of enlarged sternal lymph nodes. Histopathological examination of the sternal lymph nodes revealed expansile, well-demarcated, unencapsulated nodules of neoplastic cells consistent with a neuroendocrine tumour suspected to be thyroid in origin. After surgery, intractable pleural effusion resulted in euthanasia. Intrapericardial ectopic thyroid tumours are rarely reported in animals. The location of the mass and unusual presentation may have made it challenging for echocardiography to identify this neoplasia. Thoracic computed tomography at an earlier stage may have identified the neoplasia and potentially allowed for surgical intervention.
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Affiliation(s)
- E Pugh
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, 50 Stone Road E., Guelph, Ontario, N1G 2W1, Canada
| | - S Fonfara
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, 50 Stone Road E., Guelph, Ontario, N1G 2W1, Canada
| | - R Appleby
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, 50 Stone Road E., Guelph, Ontario, N1G 2W1, Canada
| | - D Comeau
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, 419 Gordon St., Guelph, Ontario, N1G 2W1, Canada
| | - S Minors
- Mississauga Oakville Veterinary Emergency and Specialty Hospital, 2285 Bristol Circle, Oakville, Ontario, L6H 6P8, Canada
| | - A Singh
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, 50 Stone Road E., Guelph, Ontario, N1G 2W1, Canada.
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Comeau D, Sutcliffe A, Sutcliffe S. Chest Pain Admissions During the Covid-19 Pandemic. Heart Lung Circ 2021. [PMCID: PMC8608276 DOI: 10.1016/j.hlc.2021.06.267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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Ritchie MM, Au R, Alosco ML, Mez J, Kohli M, Lin H, Pfeifer N, Comeau D. BRAIN HEALTH MONITORING PLATFORM: THE CLINICAL APPLICATIONS OF DIGITAL TECHNOLOGY IN NEUROLOGICAL DISORDERS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M M Ritchie
- Boston University, Boston, Massachusetts, United States
| | - R Au
- Department of Anatomy & Neurobiology, Neurology, & Epidemiology, Boston University Schools of Medicine & Public Health, Boston, MA, USA
| | - M L Alosco
- Department of Neurology, Boston University School of Medicine, Boston, MA, USA
| | - J Mez
- Department of Neurology, Boston University School of Medicine, Boston, MA, USA
| | - M Kohli
- Framingham Heart Study, Framingham, MA, USA
| | - H Lin
- Department of Medicine, Boston University School of Medicine, Boston, MA, USA
| | - N Pfeifer
- Ryan Center for Sports Medicine, Boston University, Boston, MA, USA
| | - D Comeau
- Ryan Center for Sports Medicine, Boston University, Boston, MA, USA
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Manning-Geist B, Murphy B, Comeau D, Conrad A, Chao S, Desalegn D, Goedken J. Predictors of medical outcome in 1,712 Ethiopian survivors of
rape. Ann Glob Health 2016. [DOI: 10.1016/j.aogh.2016.04.594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Derbew M, Hunter B, Blumberg H, Del Rio C, Mariam D, Comeau D, Maura K. A qualitative assessment of the rapid scale up of medical students in
Ethiopia: An evaluation at Addis Ababa University. Ann Glob Health 2015. [DOI: 10.1016/j.aogh.2015.02.834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Burtin D, Chabre H, Olagnier B, Didierlaurent A, Couret MN, Comeau D, Wambre E, Laparra H, Van Overtvelt L, Montandon F, Batard T, Jonval V, Lorphelin A, Merle C, Berrouet C, Parry L, Gomord V, Van Ree R, Moingeon P. Production of native and modified recombinant Der p 1 molecules in tobacco plants. Clin Exp Allergy 2009; 39:760-70. [PMID: 19226276 DOI: 10.1111/j.1365-2222.2009.03201.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND As a complex molecule requiring post-translational processing, it has been difficult to produce the Der p 1 major allergen from the Dermatophagoides pteronyssinus house dust mite in a recombinant form. OBJECTIVE Here, we tested whether transgenic tobacco plants are suitable to express Der p 1, either as a wild-type molecule or as variants lacking N-glycosylation sites (Gly(-)) and/or cysteine protease activity (Enz(-)). Methods Using Agrobacterium tumefaciens-based transformation, pro Der p 1 molecules bearing mutations within either the N-glycosylation sites (N34Q, N150Q) and/or the cysteine protease-active site (C132V) were expressed in tobacco plants. After purification by ion exchange chromatography, allergens were characterized using immunoblotting, circular dichroism (CD), as well as basophil and T lymphocyte stimulation assays. RESULTS Four forms of recombinant Der p 1 (i.e. wild-type Gly(+)/Enz(+), as well as Gly(-)/Enz(+), Gly(+)/Enz(-) or Gly(-)/Enz(-) variants) were successfully expressed in tobacco leaves as pro Der p 1 molecules. Spontaneous cleavage of the pro-peptide was observed in tobacco leaf extracts for all forms of recombinant Der p 1 (r Der p 1). CD confirmed that all r Der p 1 molecules, with the exception of the Gly(-)/Enz(-) variant, exhibited secondary structures comparable to the natural protein. A cysteine protease activity was associated only with the Gly(+)/Enz(+) form. All these molecules exhibit a profile similar to natural Der p 1 with respect to IgE immunoreactivity, basophil activation and T cell recognition. CONCLUSION A tobacco plant expression system allows the production of various forms of mature Der p 1, which could be used for diagnostic or immunotherapeutic purposes.
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Affiliation(s)
- D Burtin
- Meristem Therapeutics, Clermont-Ferrand, France
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Gabrielse G, Larochelle P, Le Sage D, Levitt B, Kolthammer WS, McConnell R, Richerme P, Wrubel J, Speck A, George MC, Grzonka D, Oelert W, Sefzick T, Zhang Z, Carew A, Comeau D, Hessels EA, Storry CH, Weel M, Walz J. Antihydrogen production within a Penning-Ioffe trap. Phys Rev Lett 2008; 100:113001. [PMID: 18517780 DOI: 10.1103/physrevlett.100.113001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Indexed: 05/26/2023]
Abstract
Slow antihydrogen (H) is produced within a Penning trap that is located within a quadrupole Ioffe trap, the latter intended to ultimately confine extremely cold, ground-state H[over ] atoms. Observed H[over ] atoms in this configuration resolve a debate about whether positrons and antiprotons can be brought together to form atoms within the divergent magnetic fields of a quadrupole Ioffe trap. The number of detected H atoms actually increases when a 400 mK Ioffe trap is turned on.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, MA 02138, USA.
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Gabrielse G, Larochelle P, Le Sage D, Levitt B, Kolthammer WS, Kuljanishvili I, McConnell R, Wrubel J, Esser FM, Glückler H, Grzonka D, Hansen G, Martin S, Oelert W, Schillings J, Schmitt M, Sefzick T, Soltner H, Zhang Z, Comeau D, George MC, Hessels EA, Storry CH, Weel M, Speck A, Nillius F, Walz J, Hänsch TW. Antiproton confinement in a Penning-Ioffe trap for antihydrogen. Phys Rev Lett 2007; 98:113002. [PMID: 17501048 DOI: 10.1103/physrevlett.98.113002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Indexed: 05/15/2023]
Abstract
Antiprotons (p[over]) remain confined in a Penning trap, in sufficient numbers to form antihydrogen (H[over ) atoms via charge exchange, when the radial field of a quadrupole Ioffe trap is added. This first demonstration with p[over] suggests that quadrupole Ioffe traps can be superimposed upon p[over] and e(+) traps to attempt the capture of H[over] atoms as they form, contrary to conclusions of previous analyses.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
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Storry CH, Speck A, Le Sage D, Guise N, Gabrielse G, Grzonka D, Oelert W, Schepers G, Sefzick T, Pittner H, Herrmann M, Walz J, Hänsch TW, Comeau D, Hessels EA. First laser-controlled antihydrogen production. Phys Rev Lett 2004; 93:263401. [PMID: 15697977 DOI: 10.1103/physrevlett.93.263401] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2004] [Indexed: 05/24/2023]
Abstract
Lasers are used for the first time to control the production of antihydrogen (H ). Sequential, resonant charge exchange collisions are involved in a method that is very different than the only other method used so far-producing slow H during positron cooling of antiprotons in a nested Penning trap. Two attractive features are that the laser frequencies determine the H binding energy, and that the production of extremely cold H should be possible in principle-likely close to what is needed for confinement in a trap, as needed for precise laser spectroscopy.
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Affiliation(s)
- C H Storry
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
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Gabrielse G, Speck A, Storry CH, LeSage D, Guise N, Grzonka D, Oelert W, Schepers G, Sefzick T, Pittner H, Walz J, Hänsch TW, Comeau D, Hessels EA. First measurement of the velocity of slow antihydrogen atoms. Phys Rev Lett 2004; 93:073401. [PMID: 15324235 DOI: 10.1103/physrevlett.93.073401] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2004] [Indexed: 05/24/2023]
Abstract
The speed of antihydrogen atoms is deduced from the fraction that passes through an oscillating electric field without ionizing. The weakly bound atoms used for this first demonstration travel about 20 times more rapidly than the average thermal speed of the antiprotons from which they form, if these are in thermal equilibrium with their 4.2 K container. The method should be applicable to much more deeply bound states, which may well be moving more slowly, and should aid the quest to lower the speed of the atoms as required if they are to be trapped for precise spectroscopy.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
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Abstract
Human prostatic acid phosphatase (PAP) has been proposed to be a prostate-epithelium differentiation antigen and its expression can be regulated by androgen. Nevertheless, the regulatory mechanism at the molecular level is not completely understood. In this communication, we demonstrated the tissue-specific expression of PAP in the normal prostate epithelium. Furthermore, results of nuclear run-on experiments indicated that androgen could regulate the transcriptional rate of the PAP gene. This mode of regulation was modulated by cell density. To investigate the transcriptional regulation, we cloned and characterized a 1.4- kilobase (kb) fragment of DNA that flanks the 5' region of the PAP gene from LNCaP human prostate carcinoma cells. The results demonstrated that this 1. 4-kb DNA fragment can drive a chloramphenicol acetyltransferase (CAT) gene expression in LNCaP cells. Also, the promoter activity was inversely correlated with the growth of those cells.
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Affiliation(s)
- S Zelivianski
- Department of Biochemistry, College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska, 68198, USA
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Forst S, Comeau D, Norioka S, Inouye M. Localization and membrane topology of EnvZ, a protein involved in osmoregulation of OmpF and OmpC in Escherichia coli. J Biol Chem 1987; 262:16433-8. [PMID: 2824492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
OmpR and EnvZ, the protein products of the ompB locus, are regulatory components required for osmoexpression of outer membrane porin proteins, OmpF and OmpC, in Escherichia coli. EnvZ is considered to be an osmosensor which transmits signals across the membrane to OmpR, a transcriptional activator for ompF and ompC. We inserted the envZ gene into a high expression vector, pIN-III. Following cellular fractionation, EnvZ was found to be localized in the inner membrane. Sequence analysis revealed that the signal peptide-like N-terminal sequence was not removed from the purified EnvZ. A genetic approach using EnvZ/beta-lactamase fusion proteins was taken to determine the topology of EnvZ in the inner membrane. When beta-lactamase was fused after the N-terminal signal peptide-like sequence, ampicillin resistance, conferred by the beta-lactamase moiety of the fusion protein, was expressed. However, when beta-lactamase was fused after the second downstream apolar sequence, the cells showed very poor ampicillin resistance indicating that the enzyme was localized on the cytoplasmic side of the inner membrane. The results of this approach reveal that the hydrophilic region of EnvZ between the two apolar sequences is periplasmically localized and that the hydrophilic region downstream of the second apolar sequence is cytoplasmically directed. These results were confirmed by partial proteolysis of the fusion proteins in intact cells.
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Affiliation(s)
- S Forst
- Department of Biochemistry, Robert Wood Johnson Medical School, Rutgers, University of Medicine and Dentistry of New Jersey, Piscataway 08854
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Forst S, Comeau D, Norioka S, Inouye M. Localization and membrane topology of EnvZ, a protein involved in osmoregulation of OmpF and OmpC in Escherichia coli. J Biol Chem 1987. [DOI: 10.1016/s0021-9258(18)49274-5] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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