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Græsholt C, Brembu T, Volpe C, Bartosova Z, Serif M, Winge P, Nymark M. Zeaxanthin epoxidase 3 Knockout Mutants of the Model Diatom Phaeodactylum tricornutum Enable Commercial Production of the Bioactive Carotenoid Diatoxanthin. Mar Drugs 2024; 22:185. [PMID: 38667802 PMCID: PMC11051370 DOI: 10.3390/md22040185] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Revised: 04/14/2024] [Accepted: 04/15/2024] [Indexed: 04/28/2024] Open
Abstract
Carotenoids are pigments that have a range of functions in human health. The carotenoid diatoxanthin is suggested to have antioxidant, anti-inflammatory and chemo-preventive properties. Diatoxanthin is only produced by a few groups of microalgae, where it functions in photoprotection. Its large-scale production in microalgae is currently not feasible. In fact, rapid conversion into the inactive pigment diadinoxanthin is triggered when cells are removed from a high-intensity light source, which is the case during large-scale harvesting of microalgae biomass. Zeaxanthin epoxidase (ZEP) 2 and/or ZEP3 have been suggested to be responsible for the back-conversion of high-light accumulated diatoxanthin to diadinoxanthin in low-light in diatoms. Using CRISPR/Cas9 gene editing technology, we knocked out the ZEP2 and ZEP3 genes in the marine diatom Phaeodactylum tricornutum to investigate their role in the diadinoxanthin-diatoxanthin cycle and determine if one of the mutant strains could function as a diatoxanthin production line. Light-shift experiments proved that ZEP3 encodes the enzyme converting diatoxanthin to diadinoxanthin in low light. Loss of ZEP3 caused the high-light-accumulated diatoxanthin to be stable for several hours after the cultures had been returned to low light, suggesting that zep3 mutant strains could be suitable as commercial production lines of diatoxanthin.
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Affiliation(s)
- Cecilie Græsholt
- Department of Biology, Norwegian University of Science and Technology, 7491 Trondheim, Norway (T.B.); (Z.B.); (M.S.); (P.W.)
| | - Tore Brembu
- Department of Biology, Norwegian University of Science and Technology, 7491 Trondheim, Norway (T.B.); (Z.B.); (M.S.); (P.W.)
| | - Charlotte Volpe
- Department of Fisheries and New Biomarine Industry, SINTEF Ocean, 7010 Trondheim, Norway;
| | - Zdenka Bartosova
- Department of Biology, Norwegian University of Science and Technology, 7491 Trondheim, Norway (T.B.); (Z.B.); (M.S.); (P.W.)
| | - Manuel Serif
- Department of Biology, Norwegian University of Science and Technology, 7491 Trondheim, Norway (T.B.); (Z.B.); (M.S.); (P.W.)
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, 7491 Trondheim, Norway (T.B.); (Z.B.); (M.S.); (P.W.)
| | - Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, 7491 Trondheim, Norway (T.B.); (Z.B.); (M.S.); (P.W.)
- Department of Fisheries and New Biomarine Industry, SINTEF Ocean, 7010 Trondheim, Norway;
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Im SH, Lepetit B, Mosesso N, Shrestha S, Weiss L, Nymark M, Roellig R, Wilhelm C, Isono E, Kroth PG. Identification of promoter targets by Aureochrome 1a in the diatom Phaeodactylum tricornutum. J Exp Bot 2024; 75:1834-1851. [PMID: 38066674 DOI: 10.1093/jxb/erad478] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Accepted: 12/04/2023] [Indexed: 03/28/2024]
Abstract
Aureochromes (AUREOs) are unique blue light receptors and transcription factors found only in stramenopile algae. While each of the four AUREOs identified in the diatom Phaeodactylum tricornutum may have a specific function, PtAUREO1a has been shown to have a strong impact on overall gene regulation, when light changes from red to blue light conditions. Despite its significance, the molecular mechanism of PtAUREO1a is largely unexplored. To comprehend the overall process of gene regulation by PtAUREO1a, we conducted a series of in vitro and in vivo experiments, including pull-down assays, yeast one-hybrid experiments, and phenotypical characterization using recombinant PtAUREOs and diatom mutant lines expressing a modified PtAureo1a gene. We describe the distinct light absorption properties of four PtAUREOs and the formation of all combinations of their potential dimers. We demonstrate the capability of PtAUREO1a and 1b to activate the genes, diatom-specific cyclin 2, PtAureo1a, and PtAureo1c under both light and dark conditions. Using mutant lines expressing a modified PtAUREO1a protein with a considerably reduced light absorption, we found novel evidence that PtAUREO1a regulates the expression of PtLHCF15, which is essential for red light acclimation. Based on current knowledge, we present a working model of PtAUREO1a gene regulation properties.
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Affiliation(s)
- Soo Hyun Im
- Plant Ecophysiology, Department of Biology, University of Konstanz, D-78457 Konstanz, Germany
| | - Bernard Lepetit
- Plant Ecophysiology, Department of Biology, University of Konstanz, D-78457 Konstanz, Germany
- Molecular Stress Physiology, Institute of Biological Sciences, University of Rostock, D-18059 Rostock, Germany
| | - Niccolò Mosesso
- Plant Physiology and Biochemistry, Department of Biology, University of Konstanz, D-78457 Konstanz, Germany
| | - Sandeep Shrestha
- Plant Ecophysiology, Department of Biology, University of Konstanz, D-78457 Konstanz, Germany
| | - Laura Weiss
- Plant Ecophysiology, Department of Biology, University of Konstanz, D-78457 Konstanz, Germany
| | - Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
| | - Robert Roellig
- Institute of Biology, Department of Plant Physiology, University of Leipzig, D-04103 Leipzig, Germany
| | - Christian Wilhelm
- Institute of Biology, Department of Plant Physiology, University of Leipzig, D-04103 Leipzig, Germany
| | - Erika Isono
- Plant Physiology and Biochemistry, Department of Biology, University of Konstanz, D-78457 Konstanz, Germany
| | - Peter G Kroth
- Plant Ecophysiology, Department of Biology, University of Konstanz, D-78457 Konstanz, Germany
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Nymark M, Finazzi G, Volpe C, Serif M, Fonseca DDM, Sharma A, Sanchez N, Sharma AK, Ashcroft F, Kissen R, Winge P, Bones AM. Loss of CpFTSY Reduces Photosynthetic Performance and Affects Insertion of PsaC of PSI in Diatoms. Plant Cell Physiol 2023; 64:583-603. [PMID: 36852859 DOI: 10.1093/pcp/pcad014] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 02/17/2023] [Accepted: 02/23/2023] [Indexed: 06/16/2023]
Abstract
The chloroplast signal recognition particle (CpSRP) receptor (CpFTSY) is a component of the CpSRP pathway that post-translationally targets light-harvesting complex proteins (LHCPs) to the thylakoid membranes in plants and green algae containing chloroplasts derived from primary endosymbiosis. In plants, CpFTSY also plays a major role in the co-translational incorporation of chloroplast-encoded subunits of photosynthetic complexes into the thylakoids. This role has not been demonstrated in green algae. So far, its function in organisms with chloroplasts derived from secondary endosymbiotic events has not been elucidated. Here, we report the generation and characterization of mutants lacking CpFTSY in the diatom Phaeodactylum tricornutum. We found that this protein is not involved in inserting LHCPs into thylakoid membranes, indicating that the post-translational part of the CpSRP pathway is not active in this group of microalgae. The lack of CpFTSY caused an increased level of photoprotection, low electron transport rates, inefficient repair of photosystem II (PSII), reduced growth, a strong decline in the PSI subunit PsaC and upregulation of proteins that might compensate for a non-functional co-translational CpSRP pathway during light stress conditions. The phenotype was highly similar to the one described for diatoms lacking another component of the co-translational CpSRP pathway, the CpSRP54 protein. However, in contrast to cpsrp54 mutants, only one thylakoid membrane protein, PetD of the Cytb6f complex, was downregulated in cpftsy. Our results point to a minor role for CpFTSY in the co-translational CpSRP pathway, suggesting that other mechanisms may partially compensate for the effect of a disrupted CpSRP pathway.
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Affiliation(s)
- Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, Trondheim N-7491, Norway
- Department of Fisheries and New Biomarine Industry, SINTEF Ocean, Trondheim 7010, Norway
| | - Giovanni Finazzi
- Cell & Plant Physiology Laboratory, Université Grenoble Alpes, CNRS, CEA, INRAE, IRIG, LPCV, Grenoble 38000, France
| | - Charlotte Volpe
- Department of Biology, Norwegian University of Science and Technology, Trondheim N-7491, Norway
- Department of Fisheries and New Biomarine Industry, SINTEF Ocean, Trondheim 7010, Norway
| | - Manuel Serif
- Department of Biology, Norwegian University of Science and Technology, Trondheim N-7491, Norway
| | - Davi de Miranda Fonseca
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, NTNU, Trondheim N-7491, Norway
- Proteomics and Modomics Experimental Core Facility (PROMEC), NTNU and Central Administration, St. Olavs Hospital, The University Hospital in Trondheim, Trondheim N-7491, Norway
| | - Animesh Sharma
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, NTNU, Trondheim N-7491, Norway
- Proteomics and Modomics Experimental Core Facility (PROMEC), NTNU and Central Administration, St. Olavs Hospital, The University Hospital in Trondheim, Trondheim N-7491, Norway
| | - Nicolas Sanchez
- Department of Chemistry, Norwegian University of Science and Technology, Trondheim N-7491, Norway
| | - Amit Kumar Sharma
- Department of Biology, Norwegian University of Science and Technology, Trondheim N-7491, Norway
| | - Felicity Ashcroft
- Department of Biology, Norwegian University of Science and Technology, Trondheim N-7491, Norway
| | - Ralph Kissen
- Department of Biology, Norwegian University of Science and Technology, Trondheim N-7491, Norway
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, Trondheim N-7491, Norway
| | - Atle Magnar Bones
- Department of Biology, Norwegian University of Science and Technology, Trondheim N-7491, Norway
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Sharma AK, Nymark M, Flo S, Sparstad T, Bones AM, Winge P. Simultaneous knockout of multiple LHCF genes using single sgRNAs and engineering of a high-fidelity Cas9 for precise genome editing in marine algae. Plant Biotechnol J 2021; 19:1658-1669. [PMID: 33759354 PMCID: PMC8384595 DOI: 10.1111/pbi.13582] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [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: 12/01/2020] [Revised: 03/05/2021] [Accepted: 03/10/2021] [Indexed: 05/25/2023]
Abstract
The CRISPR/Cas9 system is an RNA-guided sequence-specific genome editing tool, which has been adopted for single or multiple gene editing in a wide range of organisms. When working with gene families with functional redundancy, knocking out multiple genes within the same family may be required to generate a phenotype. In this study, we tested the possibility of exploiting the known tolerance of Cas9 for mismatches between the single-guide RNA (sgRNA) and target site to simultaneously introduce indels in multiple homologous genes in the marine diatom Phaeodactylum tricornutum. As a proof of concept, we designed two sgRNAs that could potentially target the same six light-harvesting complex (LHC) genes belonging to the LHCF subgroup. Mutations in up to five genes were achieved simultaneously using a previously established CRISPR/Cas9 system for P. tricornutum. A visible colour change was observed in knockout mutants with multiple LHCF lesions. A combination of pigment, LHCF protein and growth analyses was used to further investigate the phenotypic differences between the multiple LHCF mutants and WT. Furthermore, we used the two same sgRNAs in combination with a variant of the existing Cas9 where four amino acids substitutions had been introduced that previously have been shown to increase Cas9 specificity. A significant reduction of off-target editing events was observed, indicating that the altered Cas9 functioned as a high-fidelity (HiFi) Cas9 nuclease.
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Affiliation(s)
- Amit K. Sharma
- Cell, Molecular Biology and Genomics GroupDepartment of BiologyNorwegian University of Science and TechnologyNTNUTrondheimNorway
- Present address:
The University Centre in SvalbardUNISLongyearbyenNorway
| | - Marianne Nymark
- Cell, Molecular Biology and Genomics GroupDepartment of BiologyNorwegian University of Science and TechnologyNTNUTrondheimNorway
| | - Snorre Flo
- Cell, Molecular Biology and Genomics GroupDepartment of BiologyNorwegian University of Science and TechnologyNTNUTrondheimNorway
| | - Torfinn Sparstad
- Cell, Molecular Biology and Genomics GroupDepartment of BiologyNorwegian University of Science and TechnologyNTNUTrondheimNorway
| | - Atle M. Bones
- Cell, Molecular Biology and Genomics GroupDepartment of BiologyNorwegian University of Science and TechnologyNTNUTrondheimNorway
| | - Per Winge
- Cell, Molecular Biology and Genomics GroupDepartment of BiologyNorwegian University of Science and TechnologyNTNUTrondheimNorway
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Nymark M, Grønbech Hafskjold MC, Volpe C, Fonseca DDM, Sharma A, Tsirvouli E, Serif M, Winge P, Finazzi G, Bones AM. Functional studies of CpSRP54 in diatoms show that the mechanism of thylakoid protein insertion differs from that in plants and green algae. Plant J 2021; 106:113-132. [PMID: 33372269 DOI: 10.1111/tpj.15149] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 12/16/2020] [Accepted: 12/22/2020] [Indexed: 06/12/2023]
Abstract
The chloroplast signal recognition particle 54 kDa (CpSRP54) protein is a member of the CpSRP pathway known to target proteins to thylakoid membranes in plants and green algae. Loss of CpSRP54 in the marine diatom Phaeodactylum tricornutum lowers the accumulation of a selection of chloroplast-encoded subunits of photosynthetic complexes, indicating a role in the co-translational part of the CpSRP pathway. In contrast to plants and green algae, absence of CpSRP54 does not have a negative effect on the content of light-harvesting antenna complex proteins and pigments in P. tricornutum, indicating that the diatom CpSRP54 protein has not evolved to function in the post-translational part of the CpSRP pathway. Cpsrp54 KO mutants display altered photophysiological responses, with a stronger induction of photoprotective mechanisms and lower growth rates compared to wild type when exposed to increased light intensities. Nonetheless, their phenotype is relatively mild, thanks to the activation of mechanisms alleviating the loss of CpSRP54, involving upregulation of chaperones. We conclude that plants, green algae, and diatoms have evolved differences in the pathways for co-translational and post-translational insertion of proteins into the thylakoid membranes.
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Affiliation(s)
- Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
| | - Marthe Caroline Grønbech Hafskjold
- Department of Biology, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
| | - Charlotte Volpe
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
| | - Davi de Miranda Fonseca
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, NTNU, Trondheim, N-7491, Norway
- Proteomics and Modomics Experimental Core Facility (PROMEC), NTNU and Central Administration, St Olavs Hospital, The University Hospital in Trondheim, Trondheim, Norway
| | - Animesh Sharma
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, NTNU, Trondheim, N-7491, Norway
- Proteomics and Modomics Experimental Core Facility (PROMEC), NTNU and Central Administration, St Olavs Hospital, The University Hospital in Trondheim, Trondheim, Norway
| | - Eirini Tsirvouli
- Department of Biology, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
| | - Manuel Serif
- Department of Biology, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
| | - Giovanni Finazzi
- Université Grenoble Alpes (UGA), Laboratoire de Physiologie Cellulaire et Végétale, UMR 5168, Centre National de la Recherche Scientifique (CNRS), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), Interdisciplinary Research Institute of Grenoble (IRIG), CEA-Grenoble, Grenoble, 38000, France
| | - Atle Magnar Bones
- Department of Biology, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
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Nymark M, Volpe C, Hafskjold MCG, Kirst H, Serif M, Vadstein O, Bones AM, Melis A, Winge P. Loss of ALBINO3b Insertase Results in Truncated Light-Harvesting Antenna in Diatoms. Plant Physiol 2019; 181:1257-1276. [PMID: 31467163 PMCID: PMC6836812 DOI: 10.1104/pp.19.00868] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 08/10/2019] [Indexed: 05/13/2023]
Abstract
The family of chloroplast ALBINO3 (ALB3) proteins function in the insertion and assembly of thylakoid membrane protein complexes. Loss of ALB3b in the marine diatom Phaeodactylum tricornutum leads to a striking change of cell color from the normal brown to green. A 75% decrease of the main fucoxanthin-chlorophyll a/c-binding proteins was identified in the alb3b strains as the cause of changes in the spectral properties of the mutant cells. The alb3b lines exhibit a truncated light-harvesting antenna phenotype with reduced amounts of light-harvesting pigments and require a higher light intensity for saturation of photosynthesis. Accumulation of photoprotective pigments and light-harvesting complex stress-related proteins was not negatively affected in the mutant strains, but still the capacity for nonphotochemical quenching was lower compared with the wild type. In plants and green algae, ALB3 proteins interact with members of the chloroplast signal recognition particle pathway through a Lys-rich C-terminal domain. A novel conserved C-terminal domain was identified in diatoms and other stramenopiles, questioning if ALB3b proteins have the same interaction partners as their plant/green algae homologs.
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Affiliation(s)
- Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Charlotte Volpe
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | | | - Henning Kirst
- Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
| | - Manuel Serif
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Olav Vadstein
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Atle Magnar Bones
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Anastasios Melis
- Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
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Kroth PG, Bones AM, Daboussi F, Ferrante MI, Jaubert M, Kolot M, Nymark M, Río Bártulos C, Ritter A, Russo MT, Serif M, Winge P, Falciatore A. Genome editing in diatoms: achievements and goals. Plant Cell Rep 2018; 37:1401-1408. [PMID: 30167805 DOI: 10.1007/s00299-018-2334-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 08/07/2018] [Indexed: 05/20/2023]
Abstract
Diatoms are major components of phytoplankton and play a key role in the ecology of aquatic ecosystems. These algae are of great scientific importance for a wide variety of research areas, ranging from marine ecology and oceanography to biotechnology. During the last 20 years, the availability of genomic information on selected diatom species and a substantial progress in genetic manipulation, strongly contributed to establishing diatoms as molecular model organisms for marine biology research. Recently, tailored TALEN endonucleases and the CRISPR/Cas9 system were utilized in diatoms, allowing targeted genetic modifications and the generation of knockout strains. These approaches are extremely valuable for diatom research because breeding, forward genetic screens by random insertion, and chemical mutagenesis are not applicable to the available model species Phaeodactylum tricornutum and Thalassiosira pseudonana, which do not cross sexually in the lab. Here, we provide an overview of the genetic toolbox that is currently available for performing stable genetic modifications in diatoms. We also discuss novel challenges that need to be addressed to fully exploit the potential of these technologies for the characterization of diatom biology and for metabolic engineering.
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Affiliation(s)
- Peter G Kroth
- Fachbereich Biologie, Universität Konstanz, 78457, Konstanz, Germany.
| | - Atle M Bones
- Cell, Molecular Biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Fayza Daboussi
- LISBP, Université de Toulouse, CNRS, INSA, 135 Avenue de Rangueil, 31077, Toulouse, France
| | - Maria I Ferrante
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale 1, Naples, 80121, Italy
| | - Marianne Jaubert
- Laboratoire de Biologie Computationnelle et Quantitative, Institut de Biologie Paris-Seine, Sorbonne Université, CNRS, 75005, Paris, France
| | - Misha Kolot
- Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, 76100, Rehovot, Israel
- Department of Biochemistry and Molecular Biology, Tel-Aviv University, Tel-Aviv, 69978, Israel
| | - Marianne Nymark
- Cell, Molecular Biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | | | - Andrés Ritter
- Laboratoire de Biologie Computationnelle et Quantitative, Institut de Biologie Paris-Seine, Sorbonne Université, CNRS, 75005, Paris, France
| | - Monia T Russo
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale 1, Naples, 80121, Italy
| | - Manuel Serif
- LISBP, Université de Toulouse, CNRS, INSA, 135 Avenue de Rangueil, 31077, Toulouse, France
| | - Per Winge
- Cell, Molecular Biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Angela Falciatore
- Laboratoire de Biologie Computationnelle et Quantitative, Institut de Biologie Paris-Seine, Sorbonne Université, CNRS, 75005, Paris, France.
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Sharma AK, Nymark M, Sparstad T, Bones AM, Winge P. Transgene-free genome editing in marine algae by bacterial conjugation - comparison with biolistic CRISPR/Cas9 transformation. Sci Rep 2018; 8:14401. [PMID: 30258061 PMCID: PMC6158232 DOI: 10.1038/s41598-018-32342-0] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 09/03/2018] [Indexed: 12/11/2022] Open
Abstract
The CRISPR/Cas9 technology has opened the possibility for targeted genome editing in various organisms including diatom model organisms. One standard method for delivery of vectors to diatom cells is by biolistic particle bombardment. Recently delivery by conjugation was added to the tool-box. An important difference between these methods is that biolistic transformation results in transgene integration of vector DNA into the algae genome, whereas conjugative transformation allows the vector to be maintained as an episome in the recipient cells. In this study, we have used both transformation methods to deliver the CRISPR/Cas9 system to the marine diatom Phaeodactylum tricornutum aiming to induce mutations in a common target gene. This allowed us to compare the two CRISPR/Cas9 delivery systems with regard to mutation efficiency, and to assess potential problems connected to constitutive expression of Cas9. We found that the percentage of CRISPR-induced targeted biallelic mutations are similar for both methods, but an extended growth period might be needed to induce biallelic mutations when the CRISPR/Cas9 system is episomal. Independent of the CRISPR/Cas9 vector system, constitutive expression of Cas9 can cause re-editing of mutant lines with small indels. Complications associated with the biolistic transformation system like the permanent and random integration of foreign DNA into the host genome and unstable mutant lines caused by constitutive expression of Cas9 can be avoided using the episomal CRISPR/Cas9 system. The episomal vector can be eliminated from the diatom cells by removal of selection pressure, resulting in transient Cas9 expression and non-transgenic mutant lines. Depending on legislation, such lines might be considered as non-GMOs.
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Affiliation(s)
- A K Sharma
- Cell, Molecular biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
| | - M Nymark
- Cell, Molecular biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
| | - T Sparstad
- Cell, Molecular biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
| | - A M Bones
- Cell, Molecular biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
| | - P Winge
- Cell, Molecular biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway.
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Jørgensen TE, Karlsen BO, Emblem Å, Breines R, Andreassen M, Rounge TB, Nederbragt AJ, Jakobsen KS, Nymark M, Ursvik A, Coucheron DH, Jakt LM, Nordeide JT, Moum T, Johansen SD. Mitochondrial genome variation of Atlantic cod. BMC Res Notes 2018; 11:397. [PMID: 29921324 PMCID: PMC6009815 DOI: 10.1186/s13104-018-3506-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 06/15/2018] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE The objective of this study was to analyse intraspecific sequence variation of Atlantic cod mitochondrial DNA, based on a comprehensive collection of completely sequenced mitochondrial genomes. RESULTS We determined the complete mitochondrial DNA sequence of 124 cod specimens from the eastern and western part of the species' distribution range in the North Atlantic Ocean. All specimens harboured a unique mitochondrial DNA haplotype. Nine hundred and fifty-two polymorphic sites were identified, including 109 non-synonymous sites within protein coding regions. Eighteen variable sites were identified as indels, exclusively distributed in structural RNA genes and non-coding regions. Phylogeographic analyses based on 156 available cod mitochondrial genomes did not reveal a clear structure. There was a lack of mitochondrial genetic differentiation between two ecotypes of cod in the eastern North Atlantic, but eastern and western cod were differentiated and mitochondrial genome diversity was higher in the eastern than the western Atlantic, suggesting deviating population histories. The geographic distribution of mitochondrial genome variation seems to be governed by demographic processes and gene flow among ecotypes that are otherwise characterized by localized genomic divergence associated with chromosomal inversions.
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Affiliation(s)
- Tor Erik Jørgensen
- Genomics Group, Faculty of Biosciences and Aquaculture, Nord University, 8049, Bodø, Norway
| | - Bård Ove Karlsen
- Research Laboratory and Department of Laboratory Medicine, Nordland Hospital, Bodø, Norway
| | - Åse Emblem
- Department of Medical Biology, Faculty of Health Sciences, UiT-Arctic University of Norway, Tromsø, Norway
| | - Ragna Breines
- Department of Medical Biology, Faculty of Health Sciences, UiT-Arctic University of Norway, Tromsø, Norway
| | - Morten Andreassen
- Department of Medical Biology, Faculty of Health Sciences, UiT-Arctic University of Norway, Tromsø, Norway
| | - Trine B Rounge
- Centre for Ecological and Evolutionary Syntheses (CEES), Department of Biosciences, University of Oslo, Oslo, Norway
| | - Alexander J Nederbragt
- Centre for Ecological and Evolutionary Syntheses (CEES), Department of Biosciences, University of Oslo, Oslo, Norway
| | - Kjetill S Jakobsen
- Centre for Ecological and Evolutionary Syntheses (CEES), Department of Biosciences, University of Oslo, Oslo, Norway
| | - Marianne Nymark
- Department of Medical Biology, Faculty of Health Sciences, UiT-Arctic University of Norway, Tromsø, Norway
| | - Anita Ursvik
- Department of Medical Biology, Faculty of Health Sciences, UiT-Arctic University of Norway, Tromsø, Norway
| | - Dag H Coucheron
- Department of Medical Biology, Faculty of Health Sciences, UiT-Arctic University of Norway, Tromsø, Norway
| | - Lars Martin Jakt
- Genomics Group, Faculty of Biosciences and Aquaculture, Nord University, 8049, Bodø, Norway
| | - Jarle T Nordeide
- Genomics Group, Faculty of Biosciences and Aquaculture, Nord University, 8049, Bodø, Norway
| | - Truls Moum
- Genomics Group, Faculty of Biosciences and Aquaculture, Nord University, 8049, Bodø, Norway
| | - Steinar D Johansen
- Genomics Group, Faculty of Biosciences and Aquaculture, Nord University, 8049, Bodø, Norway.
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Nymark M, Sharma AK, Hafskjold MCG, Sparstad T, Bones AM, Winge P. CRISPR/Cas9 Gene Editing in the Marine Diatom Phaeodactylum tricornutum. Bio Protoc 2017; 7:e2442. [PMID: 34541161 DOI: 10.21769/bioprotoc.2442] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 07/13/2017] [Accepted: 07/21/2017] [Indexed: 11/02/2022] Open
Abstract
The establishment of the CRISPR/Cas9 technology in diatoms ( Hopes et al., 2016 ; Nymark et al., 2016 ) enables a simple, inexpensive and effective way of introducing targeted alterations in the genomic DNA of this highly important group of eukaryotic phytoplankton. Diatoms are of interest as model microorganisms in a variety of areas ranging from oceanography to materials science, in nano- and environmental biotechnology, and are presently being investigated as a source of renewable carbon-neutral fuel and chemicals. Here we present a detailed protocol of how to perform CRISPR/Cas9 gene editing of the marine diatom Phaeodactylum tricornutum, including: 1) insertion of guide RNA target site in the diatom optimized CRISPR/Cas9 vector (pKS diaCas9-sgRNA), 2) biolistic transformation for introduction of the pKS diaCas9-sgRNA plasmid to P. tricornutum cells and 3) a high resolution melting based PCR assay to screen for CRISPR/Cas9 induced mutations.
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Affiliation(s)
- Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Amit Kumar Sharma
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Marthe C G Hafskjold
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Torfinn Sparstad
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Atle M Bones
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
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Nymark M, Sharma AK, Sparstad T, Bones AM, Winge P. A CRISPR/Cas9 system adapted for gene editing in marine algae. Sci Rep 2016; 6:24951. [PMID: 27108533 PMCID: PMC4842962 DOI: 10.1038/srep24951] [Citation(s) in RCA: 205] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 04/07/2016] [Indexed: 12/15/2022] Open
Abstract
Here we report that the CRISPR/Cas9 technology can be used to efficiently generate stable targeted gene mutations in microalgae, using the marine diatom Phaeodactylum tricornutum as a model species. Our vector design opens for rapid and easy adaption of the construct to the target chosen. To screen for CRISPR/Cas9 mutants we employed high resolution melting based PCR assays, mutants were confirmed by sequencing and further validated by functional analyses.
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Affiliation(s)
- Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Amit Kumar Sharma
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Torfinn Sparstad
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Atle M Bones
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
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Valle KC, Nymark M, Aamot I, Hancke K, Winge P, Andresen K, Johnsen G, Brembu T, Bones AM. System responses to equal doses of photosynthetically usable radiation of blue, green, and red light in the marine diatom Phaeodactylum tricornutum. PLoS One 2014; 9:e114211. [PMID: 25470731 PMCID: PMC4254936 DOI: 10.1371/journal.pone.0114211] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Accepted: 11/05/2014] [Indexed: 11/21/2022] Open
Abstract
Due to the selective attenuation of solar light and the absorption properties of seawater and seawater constituents, free-floating photosynthetic organisms have to cope with rapid and unpredictable changes in both intensity and spectral quality. We have studied the transcriptional, metabolic and photo-physiological responses to light of different spectral quality in the marine diatom Phaeodactylum tricornutum through time-series studies of cultures exposed to equal doses of photosynthetically usable radiation of blue, green and red light. The experiments showed that short-term differences in gene expression and profiles are mainly light quality-dependent. Transcription of photosynthesis-associated nuclear genes was activated mainly through a light quality-independent mechanism likely to rely on chloroplast-to-nucleus signaling. In contrast, genes encoding proteins important for photoprotection and PSII repair were highly dependent on a blue light receptor-mediated signal. Changes in energy transfer efficiency by light-harvesting pigments were spectrally dependent; furthermore, a declining trend in photosynthetic efficiency was observed in red light. The combined results suggest that diatoms possess a light quality-dependent ability to activate photoprotection and efficient repair of photodamaged PSII. In spite of approximately equal numbers of PSII-absorbed quanta in blue, green and red light, the spectral quality of light is important for diatom responses to ambient light conditions.
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Affiliation(s)
- Kristin Collier Valle
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Inga Aamot
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Kasper Hancke
- Institute of Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Kjersti Andresen
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Geir Johnsen
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Tore Brembu
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Atle M. Bones
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
- * E-mail:
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Nymark M, Valle KC, Hancke K, Winge P, Andresen K, Johnsen G, Bones AM, Brembu T. Molecular and photosynthetic responses to prolonged darkness and subsequent acclimation to re-illumination in the diatom Phaeodactylum tricornutum. PLoS One 2013; 8:e58722. [PMID: 23520530 PMCID: PMC3592843 DOI: 10.1371/journal.pone.0058722] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Accepted: 02/05/2013] [Indexed: 01/04/2023] Open
Abstract
Photosynthetic diatoms that live suspended throughout the water column will constantly be swept up and down by vertical mixing. When returned to the photic zone after experiencing longer periods in darkness, mechanisms exist that enable the diatoms both to survive sudden light exposure and immediately utilize the available energy in photosynthesis and growth. We have investigated both the response to prolonged darkness and the re-acclimation to moderate intensity white irradiance (E = 100 µmol m−2 s−1) in the diatom Phaeodactylum tricornutum, using an integrated approach involving global transcriptional profiling, pigment analyses, imaging and photo-physiological measurements. The responses were studied during continuous white light, after 48 h of dark treatment and after 0.5 h, 6 h, and 24 h of re-exposure to the initial irradiance. The analyses resulted in several intriguing findings. Dark treatment of the cells led to 1) significantly decreased nuclear transcriptional activity, 2) distinct intracellular changes, 3) fixed ratios of the light-harvesting pigments despite a decrease in the total cell pigment pool, and 4) only a minor drop in photosynthetic efficiency (ΦPSII_max). Re-introduction of the cells to the initial light conditions revealed 5) distinct expression profiles for nuclear genes involved in photosynthesis and those involved in photoprotection, 6) rapid rise in photosynthetic parameters (α and rETRmax) within 0.5 h of re-exposure to light despite a very modest de novo synthesis of photosynthetic compounds, and 7) increasingly efficient resonance energy transfer from fucoxanthin chlorophyll a/c-binding protein complexes to photosystem II reaction centers during the first 0.5 h, supporting the observations stated in 6). In summary, the results show that despite extensive transcriptional, metabolic and intracellular changes, the ability of cells to perform photosynthesis was kept intact during the length of the experiment. We conclude that P. tricornutum maintains a functional photosynthetic apparatus during dark periods that enables prompt recovery upon re-illumination.
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Affiliation(s)
- Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Kristin C. Valle
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Kasper Hancke
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Kjersti Andresen
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Geir Johnsen
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Atle M. Bones
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
- * E-mail: (TB); (AB)
| | - Tore Brembu
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
- * E-mail: (TB); (AB)
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Coucheron DH, Nymark M, Breines R, Karlsen BO, Andreassen M, Jørgensen TE, Moum T, Johansen SD. Characterization of mitochondrial mRNAs in codfish reveals unique features compared to mammals. Curr Genet 2011; 57:213-22. [PMID: 21484258 PMCID: PMC3097352 DOI: 10.1007/s00294-011-0338-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 03/27/2011] [Accepted: 03/28/2011] [Indexed: 11/25/2022]
Abstract
Expression and processing of mitochondrial gene transcripts are fundamental to mitochondrial function, but information from early vertebrates like teleost fishes is essentially lacking. We have analyzed mitogenome sequences of ten codfishes (family Gadidae), and provide complete sequences from three new species (Saithe, Pollack and Blue whiting). Characterization of the mitochondrial mRNAs in Saithe and Atlantic cod identified a set of ten poly(A) transcripts, and six UAA stop codons are generated by posttranscriptional polyadenylation. Structural assessment of poly(A) sites is consistent with an RNaseP cleavage activity 5' of tRNA acceptor-like stems. COI, ND5 and ND6 mRNAs were found to harbor 3' UTRs with antisense potential extending into neighboring gene regions. While the 3' UTR of COI mRNA is complementary to the tRNA(Ser UCN) and highly similar to that detected in human mitochondria, the ND5 and ND6 3' UTRs appear more heterogenic. Deep sequencing confirms expression of all mitochondrial mRNAs and rRNAs, and provides information about the precise 5' ends in mature transcripts. Our study supports an overall evolutionary conservation in mitochondrial RNA processing events among vertebrates, but reveals some unique 5' and 3' end characteristics in codfish mRNAs with implications to antisense regulation of gene expression.
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Affiliation(s)
- Dag H. Coucheron
- RNA and Transcriptomics group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, MH-building Breivika, 9037 Tromsø, Norway
| | - Marianne Nymark
- RNA and Transcriptomics group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, MH-building Breivika, 9037 Tromsø, Norway
| | - Ragna Breines
- RNA and Transcriptomics group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, MH-building Breivika, 9037 Tromsø, Norway
| | - Bård Ove Karlsen
- RNA and Transcriptomics group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, MH-building Breivika, 9037 Tromsø, Norway
- Marine Genomics group, Faculty of Biosciences and Aquaculture, University of Nordland, Bodø, Norway
| | - Morten Andreassen
- RNA and Transcriptomics group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, MH-building Breivika, 9037 Tromsø, Norway
| | - Tor Erik Jørgensen
- Marine Genomics group, Faculty of Biosciences and Aquaculture, University of Nordland, Bodø, Norway
| | - Truls Moum
- Marine Genomics group, Faculty of Biosciences and Aquaculture, University of Nordland, Bodø, Norway
| | - Steinar D. Johansen
- RNA and Transcriptomics group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, MH-building Breivika, 9037 Tromsø, Norway
- Marine Genomics group, Faculty of Biosciences and Aquaculture, University of Nordland, Bodø, Norway
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Nymark M, Valle KC, Brembu T, Hancke K, Winge P, Andresen K, Johnsen G, Bones AM. An integrated analysis of molecular acclimation to high light in the marine diatom Phaeodactylum tricornutum. PLoS One 2009; 4:e7743. [PMID: 19888450 PMCID: PMC2766053 DOI: 10.1371/journal.pone.0007743] [Citation(s) in RCA: 188] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2009] [Accepted: 10/06/2009] [Indexed: 12/22/2022] Open
Abstract
Photosynthetic diatoms are exposed to rapid and unpredictable changes in irradiance and spectral quality, and must be able to acclimate their light harvesting systems to varying light conditions. Molecular mechanisms behind light acclimation in diatoms are largely unknown. We set out to investigate the mechanisms of high light acclimation in Phaeodactylum tricornutum using an integrated approach involving global transcriptional profiling, metabolite profiling and variable fluorescence technique. Algae cultures were acclimated to low light (LL), after which the cultures were transferred to high light (HL). Molecular, metabolic and physiological responses were studied at time points 0.5 h, 3 h, 6 h, 12 h, 24 h and 48 h after transfer to HL conditions. The integrated results indicate that the acclimation mechanisms in diatoms can be divided into an initial response phase (0–0.5 h), an intermediate acclimation phase (3–12 h) and a late acclimation phase (12–48 h). The initial phase is recognized by strong and rapid regulation of genes encoding proteins involved in photosynthesis, pigment metabolism and reactive oxygen species (ROS) scavenging systems. A significant increase in light protecting metabolites occur together with the induction of transcriptional processes involved in protection of cellular structures at this early phase. During the following phases, the metabolite profiling display a pronounced decrease in light harvesting pigments, whereas the variable fluorescence measurements show that the photosynthetic capacity increases strongly during the late acclimation phase. We show that P. tricornutum is capable of swift and efficient execution of photoprotective mechanisms, followed by changes in the composition of the photosynthetic machinery that enable the diatoms to utilize the excess energy available in HL. Central molecular players in light protection and acclimation to high irradiance have been identified.
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Affiliation(s)
- Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Kristin C. Valle
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Tore Brembu
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Kasper Hancke
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Kjersti Andresen
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Geir Johnsen
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Atle M. Bones
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
- * E-mail:
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Petersen PV, Lassen N, Hansen V, Huld T, Hjortkjaer J, Holmblad J, Nielsen IM, Nymark M, Pedersen V, Jorgensen A, Hougs W. Pharmacological studies of a new series of bicyclic thymoleptics. Acta Pharmacol Toxicol (Copenh) 2009; 24:121-33. [PMID: 4165059 DOI: 10.1111/j.1600-0773.1966.tb00375.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Nielsen IM, Pedersen V, Nymark M, Franck KF, Boeck V, Fjalland B, Christensen AV. The comparative pharmacology of flupenthixol and some reference neuroleptics. Acta Pharmacol Toxicol (Copenh) 2009; 33:353-62. [PMID: 4801081 DOI: 10.1111/j.1600-0773.1973.tb01537.x] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Nymark M, Franck KF, Pedersen V, Boeck V, Nielsen IM. Prolonged neuroleptic effect of alpha-flupenthixol decanoate in oil. Acta Pharmacol Toxicol (Copenh) 2009; 33:363-76. [PMID: 4801082 DOI: 10.1111/j.1600-0773.1973.tb01538.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Petersen PV, Lassen N, Ammitzboll T, Moller Nielsen I, Nymark M, Pedersen V, Franck KF. Further pharmacological studies of bicyclic thymoleptics. Acta Pharmacol Toxicol (Copenh) 2009; 28:241-8. [PMID: 5468078 DOI: 10.1111/j.1600-0773.1970.tb00550.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Breines R, Ursvik A, Nymark M, Johansen SD, Coucheron DH. Complete mitochondrial genome sequences of the Arctic Ocean codfishes Arctogadus glacialis and Boreogadus saida reveal oriL and tRNA gene duplications. Polar Biol 2008. [DOI: 10.1007/s00300-008-0463-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Nymark M. Patients' safety, privacy and effectiveness--a conflict of interests in health care information systems? Med Law 2007; 26:245-55. [PMID: 17639849] [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] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Information technology (IT) is finding its way into daily clinical work. IT is primarily seen as a tool for providing quality of service, cutting costs and promoting efficiency in every aspect of health care, but improvements for patients' safety are also a driving force. IT-solutions can be found both at an administrative and a clinical level, supporting everything from documentation, distribution and storing of patient data to workflows, monitoring and decision making. However, the increasing use of IT in health care raises questions. What is the impact on patients' rights and privacy? Does the law benefit IT-solutions in health care, or does it raise barriers for optimized use? Which interests does the law safeguard in the health care sector, and in the light of an increasing use of IT, do any of these identified interests collide? In conjunction with a governmental national project (InfoVU) during 2001-2004, the Swedish National Board of Health and Welfare (NBHW) had to address these issues and other legal aspects of IT use in health care. The agency's analysis was published in November 2005. The purpose of this article is to present some of the agency's conclusions on legal issues pertaining to the management and processing of patient data. It will show, from a Swedish legislative point of view, the need for a common information security strategy for health care information management as well as discussing other legislative issues in order to meet both the patients' and the health care provider's interests in an electronic environment.
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Affiliation(s)
- M Nymark
- The National Board of Health and Welfare, Stockholm, Sweden
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Mollernielsen I, Jorgensen A, Overo KF, Nymark M, Franck KF. [Some pharmacological and pharmacokinetic aspects of depot and sustained-release preparations]. Nord Psykiatr Tidsskr 1971; 25:280-95. [PMID: 5154113 DOI: 10.3109/08039487109094671] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Nielsen IM, Nymark M, Hougs W, Pedersen V. The pharmacological properties of melitracen (N 7001) and litracen (N 7049). Arzneimittelforschung 1966; 16:135-40. [PMID: 6014004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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