1
|
Cho A, Lax G, Keeling PJ. Phylogenomic analyses of ochrophytes (stramenopiles) with an emphasis on neglected lineages. Mol Phylogenet Evol 2024; 198:108120. [PMID: 38852907 DOI: 10.1016/j.ympev.2024.108120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 05/13/2024] [Accepted: 06/04/2024] [Indexed: 06/11/2024]
Abstract
Ochrophyta is a photosynthetic lineage that crowns the phylogenetic tree of stramenopiles, one of the major eukaryotic supergroups. Due to their ecological impact as a major primary producer, ochrophytes are relatively well-studied compared to the rest of the stramenopiles, yet their evolutionary relationships remain poorly understood. This is in part due to a number of missing lineages in large-scale multigene analyses, and an apparently rapid radiation leading to many short internodes between ochrophyte subgroups in the tree. These short internodes are also found across deep-branching lineages of stramenopiles with limited phylogenetic signal, leaving many relationships controversial overall. We have addressed this issue with other deep-branching stramenopiles recently, and now examine whether contentious relationships within the ochrophytes may be resolved with the help of filling in missing lineages in an updated phylogenomic dataset of ochrophytes, along with exploring various gene filtering criteria to identify the most phylogenetically informative genes. We generated ten new transcriptomes from various culture collections and a single-cell isolation from an environmental sample, added these to an existing phylogenomic dataset, and examined the effects of selecting genes with high phylogenetic signal or low phylogenetic noise. For some previously contentious relationships, we find a variety of analyses and gene filtering criteria consistently unite previously unstable groupings with strong statistical support. For example, we recovered a robust grouping of Eustigmatophyceae with Raphidophyceae-Phaeophyceae-Xanthophyceae while Olisthodiscophyceae formed a sister-lineage to Pinguiophyceae. Selecting genes with high phylogenetic signal or data quality recovered more stable topologies. Overall, we find that adding under-represented groups across different lineages is still crucial in resolving phylogenetic relationships, and discrete gene properties affect lineages of stramenopiles differently. This is something which may be explored to further our understanding of the molecular evolution of stramenopiles.
Collapse
Affiliation(s)
- Anna Cho
- Department of Botany, University of British Columbia, Vancouver V6T 1Z4, British Columbia, Canada.
| | - Gordon Lax
- Department of Botany, University of British Columbia, Vancouver V6T 1Z4, British Columbia, Canada
| | - Patrick J Keeling
- Department of Botany, University of British Columbia, Vancouver V6T 1Z4, British Columbia, Canada
| |
Collapse
|
2
|
Md Ahaik FA, Mohd Taufik SH, Faiqah Johari NA, Zainal Abidin AA, Balia Yusof ZN. Optimization of nucleic acid extraction and amplification of a thiamine biosynthesis gene fragment from selected Malaysian seaweeds. Genes Genet Syst 2023; 97:247-256. [PMID: 36631109 DOI: 10.1266/ggs.22-00088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Obtaining high-quality nucleic acid extracted from seaweeds is notoriously difficult due to contamination with polysaccharides and polyphenolic compounds after cell disruption. Specific methods need to be employed for RNA isolation in different seaweed species, and therefore studies of the thiamine biosynthesis pathway have been limited. Two selected Malaysian species which are highly abundant and underutilized, namely Gracilaria sp. and Padina sp., representing the red and brown seaweeds, respectively, were collected to develop optimized total RNA extraction methods. Prior to that, DNA was extracted, and amplification of the 18S rRNA gene and the THIC gene (encoding the first enzyme in the pyrimidine branch of the thiamine biosynthesis pathway) from the DNA template was successful in Gracilaria sp. only. RNA was then extracted from both seaweeds using three different existing methods, with some modifications, using cetyltrimethylammonium bromide, guanidine thiocyanate and sodium dodecyl sulphate. Methods I and III proved to be efficient for Padina sp. and Gracilaria sp., respectively, for the extraction of highly purified RNA, with A260/A280 values of 2.0 and 1.8. However, amplification of the housekeeping gene glyceraldehyde-3-phosphate dehydrogenase and the THIC gene was successful in only Gracilaria sp. cDNA derived from extracted RNA. Further modifications are required to improve the exploitation of nucleic acids from brown seaweeds, which has been proven to be difficult. This work should pave the way for molecular studies of seaweeds generally and for the elucidation, specifically, of the thiamine biosynthesis pathway.
Collapse
Affiliation(s)
- Fatin Amira Md Ahaik
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia
| | - Siti Hajar Mohd Taufik
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia
| | - Nur Asna Faiqah Johari
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia
| | | | - Zetty Norhana Balia Yusof
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia.,Aquatic Animal Health and Therapeutics Laboratory (AquaHealth), Institute of Bioscience, Universiti Putra Malaysia.,Bioprocessing and Biomanufacturing Research Complex, Universiti Putra Malaysia
| |
Collapse
|
3
|
Rubiño S, Peteiro C, Aymerich T, Hortós M. Major lipophilic pigments in Atlantic seaweeds as valuable food ingredients: Analysis and assessment of quantification methods. Food Res Int 2022; 159:111609. [PMID: 35940804 DOI: 10.1016/j.foodres.2022.111609] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 06/20/2022] [Accepted: 06/29/2022] [Indexed: 11/25/2022]
Abstract
Current trends towards the use of ingredients from natural origin in food, cosmetic and pharmaceutical industry, place macroalgae as a good reservoir of novel compounds. Among them, lipophilic major pigments such as chlorophylls and fucoxanthin, are of great interest because of their multiple applications as bioactive compounds and dyes. In this work, a mid-polarity medium was used to extract pigments from twenty-four species from North coast of Spain, including brown (Phaeophyceae) and red macroalgae (Rhodophyta). The fucoxanthin and chlorophyll a content was assessed by means of two different methods, spectrophotometric and high-performance liquid chromatography coupled to diode array detection (HPLC-DAD). The effect of dried processing on the pigment content of selected species was also evaluated. A linear relationship between the extractability of fucoxanthin and chlorophyll a was observed, being the highest content recorded among members belonging to the order Fucales and Undaria pinnatifida. This work provides good insights about the content on pigments in Spanish North Atlantic macroalgae with future commercial value in different industrial fields, as well as a critical overview of the suitability of the quantification methods and challenges related to their effect in results evaluation.
Collapse
Affiliation(s)
- S Rubiño
- IRTA-Food Safety and Functionality Programme. Finca Camps i Armet s/n, 17121 Monells, Girona, Spain
| | - C Peteiro
- Spanish Institute of Oceanography of the Spanish National Research Council (IEO, CSIC), Oceanographic Centre of Santander, Marine Culture Units "El Bocal", Seaweeds Centre. Barrio Corbanera s/n., 39012 Monte, Santander, Spain
| | - T Aymerich
- IRTA-Food Safety and Functionality Programme. Finca Camps i Armet s/n, 17121 Monells, Girona, Spain
| | - M Hortós
- IRTA-Food Safety and Functionality Programme. Finca Camps i Armet s/n, 17121 Monells, Girona, Spain.
| |
Collapse
|
4
|
Cen C, Zhang K, Fu J, Wu X, Wu J, Zheng Y, Zhang Y. Odor-producing response pattern by four typical freshwater algae under stress: Acute microplastic exposure as an example. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 821:153350. [PMID: 35077797 DOI: 10.1016/j.scitotenv.2022.153350] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/19/2022] [Accepted: 01/19/2022] [Indexed: 06/14/2023]
Abstract
Algae-induced odor problems in water have been repeatedly occurred concerns for drinking water quality. However, present researches mostly focus on the odor-producing pattern of algae in normal growth, and there is scarce discussion on those under stress. Microplastics (MPs) pollution have been global concern for their negative ecological impacts and frequently co-occurs with odor-producing algal bloom in freshwaters. Thus, this study aimed to elucidate the effects and mechanisms of MPs as an environmental stress on algal odorant production for good illustration of odor-producing response pattern under stress. Variation in MP size (polystyrene microspheres; 100 nm, 1000 nm and 10 μm) had significant effects on odorant formation (β-cycloidal, 2-methylisopropanol, 2,4-heptandienal and 2,4-decadienal) by four freshwater algae (Microcystis aeruginosa, Pseudanabaena sp., Cyclotella meneghiniana and Melosira varians). The size ratio of MPs over cells (SRMC) was proposed to categorize the size-ratio dependent effects on the algal odorant production. Interestingly, when SRMC was in the range of 0.1-1, there were always promoting effects; when SRMC < 0.1 or SRMC > 1, there exhibited inhibiting effects, and the inhibiting effects of SRMC < 0.1 were far more severe than those of SRMC > 1. The promotion on odorant production in the SRMC range of 0.1-1 was mainly attributed to the increase in cellular yield, which was related to the increased odorant precursors derived from the oxidation products of reactive oxygen species (ROS). Alternatively, the inhibition of odorant production caused by MPs with SRMC < 0.1 was the results of simultaneously inhibiting cellular density and cellular yield, which might be attributed to the cellular internalization of MPs, inducing the extensive toxic effects. This study illustrated the possibilities of MPs in impairing the esthetics of the source water and provided guidance for the future algal odor issues under stress.
Collapse
Affiliation(s)
- Cheng Cen
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
| | - Kejia Zhang
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China.
| | - Jie Fu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Xiaogang Wu
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
| | - Jiajia Wu
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
| | - Yingying Zheng
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
| | - Yibo Zhang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| |
Collapse
|
5
|
Pajot A, Lavaud J, Carrier G, Garnier M, Saint-Jean B, Rabilloud N, Baroukh C, Bérard JB, Bernard O, Marchal L, Nicolau E. The Fucoxanthin Chlorophyll a/c-Binding Protein in Tisochrysis lutea: Influence of Nitrogen and Light on Fucoxanthin and Chlorophyll a/c-Binding Protein Gene Expression and Fucoxanthin Synthesis. FRONTIERS IN PLANT SCIENCE 2022; 13:830069. [PMID: 35251102 PMCID: PMC8891753 DOI: 10.3389/fpls.2022.830069] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 01/20/2022] [Indexed: 06/13/2023]
Abstract
We observed differences in lhc classification in Chromista. We proposed a classification of the lhcf family with two groups specific to haptophytes, one specific to diatoms, and one specific to seaweeds. Identification and characterization of the Fucoxanthin and Chlorophyll a/c-binding Protein (FCP) of the haptophyte microalgae Tisochrysis lutea were performed by similarity analysis. The FCP family contains 52 lhc genes in T. lutea. FCP pigment binding site candidates were characterized on Lhcf protein monomers of T. lutea, which possesses at least nine chlorophylls and five fucoxanthin molecules, on average, per monomer. The expression of T. lutea lhc genes was assessed during turbidostat and chemostat experiments, one with constant light (CL) and changing nitrogen phases, the second with a 12 h:12 h sinusoidal photoperiod and changing nitrogen phases. RNA-seq analysis revealed a dynamic decrease in the expression of lhc genes with nitrogen depletion. We observed that T. lutea lhcx2 was only expressed at night, suggesting that its role is to protect \cells from return of light after prolonged darkness exposure.
Collapse
Affiliation(s)
- Anne Pajot
- IFREMER, Physiology and Biotechnology of Algae Laboratory, Nantes, France
| | - Johann Lavaud
- LEMAR-Laboratoire des Sciences de l’Environnement Marin, UMR 6539, CNRS/Univ Brest/Ifremer/IRD, Institut Universitaire Européen de la Mer, Technopôle Brest-Iroise, Plouzané, France
| | - Gregory Carrier
- IFREMER, Physiology and Biotechnology of Algae Laboratory, Nantes, France
| | - Matthieu Garnier
- IFREMER, Physiology and Biotechnology of Algae Laboratory, Nantes, France
| | - Bruno Saint-Jean
- IFREMER, Physiology and Biotechnology of Algae Laboratory, Nantes, France
| | - Noémie Rabilloud
- IFREMER, Physiology and Biotechnology of Algae Laboratory, Nantes, France
| | - Caroline Baroukh
- IFREMER, Physiology and Biotechnology of Algae Laboratory, Nantes, France
| | | | - Olivier Bernard
- Université Côte d’Azur, Biocore, INRIA, CNRS, Sorbonne Université (LOV, UMR 7093), Sophia-Antipolis, France
| | | | - Elodie Nicolau
- IFREMER, Physiology and Biotechnology of Algae Laboratory, Nantes, France
| |
Collapse
|
6
|
Linardić M, Braybrook SA. Identification and selection of optimal reference genes for qPCR-based gene expression analysis in Fucus distichus under various abiotic stresses. PLoS One 2021; 16:e0233249. [PMID: 33909633 PMCID: PMC8081170 DOI: 10.1371/journal.pone.0233249] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 02/18/2021] [Indexed: 11/19/2022] Open
Abstract
Quantitative gene expression analysis is an important tool in the scientist's belt. The identification of evenly expressed reference genes is necessary for accurate quantitative gene expression analysis, whether by traditional RT-PCR (reverse-transcription polymerase chain reaction) or by qRT-PCR (quantitative real-time PCR; qPCR). In the Stramenopiles (the major line of eukaryotes that includes brown algae) there is a noted lack of known reference genes for such studies, largely due to the absence of available molecular tools. Here we present a set of nine reference genes (Elongation Factor 1 alpha (EF1A), Elongation Factor 2 alpha (EF2A), Elongation Factor 1 beta (EF1B), 14-3-3 Protein, Ubiquitin Conjugating Enzyme (UBCE2), Glyceraldehyde-3-phosphate Dehydrogenase (GAPDH), Actin Related Protein Complex (ARP2/3), Ribosomal Protein (40s; S23), and Actin) for the brown alga Fucus distichus. These reference genes were tested on adult sporophytes across six abiotic stress conditions (desiccation, light and temperature modification, hormone addition, pollutant exposure, nutrient addition, and wounding). Suitability of these genes as reference genes was quantitatively evaluated across conditions using standard methods and the majority of the tested genes were evaluated favorably. However, we show that normalization genes should be chosen on a condition-by-condition basis. We provide a recommendation that at least two reference genes be used per experiment, a list of recommended pairs for the conditions tested here, and a procedure for identifying a suitable set for an experimenter's unique design. With the recent expansion of interest in brown algal biology and accompanied molecular tools development, the variety of experimental conditions tested here makes this study a valuable resource for future work in basic biology and understanding stress responses in the brown algal lineage.
Collapse
Affiliation(s)
- Marina Linardić
- Department of Molecular, Cell and Developmental Biology, University of California Los Angeles, Los Angeles, California, United States of America
- Department of Energy Institute of Genomics and Proteomics, University of California Los Angeles, Los Angeles, California, United States of America
| | - Siobhan A. Braybrook
- Department of Molecular, Cell and Developmental Biology, University of California Los Angeles, Los Angeles, California, United States of America
- Department of Energy Institute of Genomics and Proteomics, University of California Los Angeles, Los Angeles, California, United States of America
- Molecular Biology Institute, University of Los Angeles, Los Angeles, California, United States of America
| |
Collapse
|
7
|
Emeline CB, Ludovic D, Laurent V, Catherine L, Kruse I, Erwan AG, Florian W, Philippe P. Induction of Phlorotannins and Gene Expression in the Brown Macroalga Fucus vesiculosus in Response to the Herbivore Littorina littorea. Mar Drugs 2021; 19:185. [PMID: 33810577 PMCID: PMC8067260 DOI: 10.3390/md19040185] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/23/2021] [Accepted: 03/23/2021] [Indexed: 01/05/2023] Open
Abstract
Mechanisms related to the induction of phlorotannin biosynthesis in marine brown algae remain poorly known. Several studies undertaken on fucoid species have shown that phlorotannins accumulate in the algae for several days or weeks after being exposed to grazing, and this is measured by direct quantification of soluble phenolic compounds. In order to investigate earlier inducible responses involved in phlorotannin metabolism, Fucus vesiculosus was studied between 6 and 72 h of grazing by the sea snail Littorina littorea. In this study, the quantification of soluble phenolic compounds was complemented by a Quantitative real-time PCR (qRT-PCR) approach applied on genes that are potentially involved in either the phlorotannin metabolism or stress responses. Soluble phlorotannin levels remained stable during the kinetics and increased significantly only after 12 h in the presence of grazers, compared to the control, before decreasing to the initial steady state for the rest of the kinetics. Under grazing conditions, the expression of vbpo, cyp450 and ast6 genes was upregulated, respectively, at 6 h, 12 h and 24 h, and cyp450 gene was downregulated after 72 h. Interestingly, the pksIII gene involved in the synthesis of phloroglucinol was overexpressed under grazing conditions after 24 h and 72 h. This study supports the hypothesis that phlorotannins are able to provide an inducible chemical defense under grazing activity, which is regulated at different stages of the stress response.
Collapse
Affiliation(s)
- Creis Bendelac Emeline
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
- International Research Laboratory IRL 3614, CNRS, Sorbonne Université, PUC, UACH, Evolutionary Biology and Ecology of Algae, EBEA, Station Biologique, 29680 Roscoff, Brittany, France
| | - Delage Ludovic
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
| | - Vallet Laurent
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
| | - Leblanc Catherine
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
| | - Inken Kruse
- Helmholtz Centre for Ocean Research (GEOMAR), Düsternbrooker Weg 20, 24105 Kiel, Germany; (I.K.); (W.F.)
| | - Ar Gall Erwan
- Laboratoire des Sciences de l’Environnement Marin, UBO European Institute for Marine Studies IUEM, University of Brest—Western Brittany, UMR 6539 LEMAR, Technopôle Brest Iroise, Rue Dumont d’Urville, 29280 Plouzané, Brittany, France
| | - Weinberger Florian
- Helmholtz Centre for Ocean Research (GEOMAR), Düsternbrooker Weg 20, 24105 Kiel, Germany; (I.K.); (W.F.)
| | - Potin Philippe
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
| |
Collapse
|
8
|
Variation in Lipid Components from 15 Species of Tropical and Temperate Seaweeds. Mar Drugs 2019; 17:md17110630. [PMID: 31698797 PMCID: PMC6891767 DOI: 10.3390/md17110630] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 10/29/2019] [Accepted: 10/29/2019] [Indexed: 12/19/2022] Open
Abstract
The present study describes the variation in lipid components from 15 species of seaweeds belonging to the Chlorophyta, Ochrophyta, and Rhodophyta phyla collected in tropical (Indonesia) and temperate (Japan) areas. Analyses were performed of multiple components, including chlorophylls, carotenoids, n-3 and n-6 polyunsaturated fatty acids (PUFAs), and alpha tocopherol (α-Toc). Chlorophyll (Chl) and carotenoid contents varied among phyla, but not with the sampling location. Chl a and b were the major chlorophylls in Chlorophyta. Chl a and Chl c were the main chlorophylls in Ochrophyta, while Chl a was the dominant chlorophylls in Rhodophyta. β-Carotene and fucoxanthin were detected as major seaweed carotenoids. The former was present in all species in a variety of ranges, while the latter was mainly found in Ochrophyta and in small quantities in Rhodophyta, but not in Chlorophyta. The total lipids (TL) content and fatty acids composition were strongly affected by sampling location. The TL and n-3 PUFAs levels tended to be higher in temperate seaweeds compared with those in tropical seaweeds. The major n-3 PUFAs in different phyla, namely, eicosapentaenoic acid (EPA) and stearidonic acid (SDA) in Ochrophyta, α-linolenic acid (ALA) and SDA in Chlorophyta, and EPA in Rhodophyta, accumulated in temperate seaweeds. Chlorophylls, their derivatives, and carotenoids are known to have health benefits, such as antioxidant activities, while n-3 PUFAs are known to be essential nutrients that positively influence human nutrition and health. Therefore, seaweed lipids could be used as a source of ingredients with health benefits for functional foods and nutraceuticals.
Collapse
|
9
|
Arun A, Coelho SM, Peters AF, Bourdareau S, Pérès L, Scornet D, Strittmatter M, Lipinska AP, Yao H, Godfroy O, Montecinos GJ, Avia K, Macaisne N, Troadec C, Bendahmane A, Cock JM. Convergent recruitment of TALE homeodomain life cycle regulators to direct sporophyte development in land plants and brown algae. eLife 2019; 8:e43101. [PMID: 30644818 PMCID: PMC6368402 DOI: 10.7554/elife.43101] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 01/13/2019] [Indexed: 01/21/2023] Open
Abstract
Three amino acid loop extension homeodomain transcription factors (TALE HD TFs) act as life cycle regulators in green algae and land plants. In mosses these regulators are required for the deployment of the sporophyte developmental program. We demonstrate that mutations in either of two TALE HD TF genes, OUROBOROS or SAMSARA, in the brown alga Ectocarpus result in conversion of the sporophyte generation into a gametophyte. The OUROBOROS and SAMSARA proteins heterodimerise in a similar manner to TALE HD TF life cycle regulators in the green lineage. These observations demonstrate that TALE-HD-TF-based life cycle regulation systems have an extremely ancient origin, and that these systems have been independently recruited to regulate sporophyte developmental programs in at least two different complex multicellular eukaryotic supergroups, Archaeplastida and Chromalveolata.
Collapse
Affiliation(s)
- Alok Arun
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Susana M Coelho
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | | | - Simon Bourdareau
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Laurent Pérès
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Delphine Scornet
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Martina Strittmatter
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Agnieszka P Lipinska
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Haiqin Yao
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Olivier Godfroy
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Gabriel J Montecinos
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Komlan Avia
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Nicolas Macaisne
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| | - Christelle Troadec
- Institut National de la Recherche Agronomique (INRA), Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-SudOrsayFrance
| | - Abdelhafid Bendahmane
- Institut National de la Recherche Agronomique (INRA), Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-SudOrsayFrance
| | - J Mark Cock
- Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)RoscoffFrance
| |
Collapse
|
10
|
Streckaite S, Gardian Z, Li F, Pascal AA, Litvin R, Robert B, Llansola-Portoles MJ. Pigment configuration in the light-harvesting protein of the xanthophyte alga Xanthonema debile. PHOTOSYNTHESIS RESEARCH 2018; 138:139-148. [PMID: 30006883 DOI: 10.1007/s11120-018-0557-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 07/09/2018] [Indexed: 06/08/2023]
Abstract
The soil chromophyte alga Xanthonema (X.) debile contains only non-carbonyl carotenoids and Chl-a. X. debile has an antenna system denoted Xanthophyte light-harvesting complex (XLH) that contains the carotenoids diadinoxanthin, heteroxanthin, and vaucheriaxanthin. The XLH pigment stoichiometry was calculated by chromatographic techniques and the pigment-binding structure studied by resonance Raman spectroscopy. The pigment ratio obtained by HPLC was found to be close to 8:1:2:1 Chl-a:heteroxanthin:diadinoxanthin:vaucheriaxanthin. The resonance Raman spectra suggest the presence of 8-10 Chl-a, all of which are 5-coordinated to the central Mg, with 1-3 Chl-a possessing a macrocycle distorted from the relaxed conformation. The three populations of carotenoids are in the all-trans configuration. Vaucheriaxanthin absorbs around 500-530 nm, diadinoxanthin at 494 nm and heteroxanthin at 487 nm at 4.5 K. The effective conjugation length of heteroxanthin and diadinoxanthin has been determined as 9.4 in both cases; the environment polarizability of the heteroxanthin and diadinoxanthin binding pockets is 0.270 and 0.305, respectively.
Collapse
Affiliation(s)
- Simona Streckaite
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Saclay, 91198, Gif-sur-Yvette cedex, France
| | - Zdenko Gardian
- Biology Centre, Czech Academy of Sciences, Branisovska 31, 370 05, Ceske Budejovice, Czech Republic
- Faculty of Science, University of South Bohemia, Branisovska 1760, 370 05, Ceske Budejovice, Czech Republic
| | - Fei Li
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Saclay, 91198, Gif-sur-Yvette cedex, France
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, People's Republic of China
| | - Andrew A Pascal
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Saclay, 91198, Gif-sur-Yvette cedex, France
| | - Radek Litvin
- Biology Centre, Czech Academy of Sciences, Branisovska 31, 370 05, Ceske Budejovice, Czech Republic
- Faculty of Science, University of South Bohemia, Branisovska 1760, 370 05, Ceske Budejovice, Czech Republic
| | - Bruno Robert
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Saclay, 91198, Gif-sur-Yvette cedex, France
| | - Manuel J Llansola-Portoles
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Saclay, 91198, Gif-sur-Yvette cedex, France.
| |
Collapse
|
11
|
Waldron FM, Stone GN, Obbard DJ. Metagenomic sequencing suggests a diversity of RNA interference-like responses to viruses across multicellular eukaryotes. PLoS Genet 2018; 14:e1007533. [PMID: 30059538 PMCID: PMC6085071 DOI: 10.1371/journal.pgen.1007533] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 08/09/2018] [Accepted: 07/04/2018] [Indexed: 11/24/2022] Open
Abstract
RNA interference (RNAi)-related pathways target viruses and transposable element (TE) transcripts in plants, fungi, and ecdysozoans (nematodes and arthropods), giving protection against infection and transmission. In each case, this produces abundant TE and virus-derived 20-30nt small RNAs, which provide a characteristic signature of RNAi-mediated defence. The broad phylogenetic distribution of the Argonaute and Dicer-family genes that mediate these pathways suggests that defensive RNAi is ancient, and probably shared by most animal (metazoan) phyla. Indeed, while vertebrates had been thought an exception, it has recently been argued that mammals also possess an antiviral RNAi pathway, although its immunological relevance is currently uncertain and the viral small RNAs (viRNAs) are not easily detectable. Here we use a metagenomic approach to test for the presence of viRNAs in five species from divergent animal phyla (Porifera, Cnidaria, Echinodermata, Mollusca, and Annelida), and in a brown alga-which represents an independent origin of multicellularity from plants, fungi, and animals. We use metagenomic RNA sequencing to identify around 80 virus-like contigs in these lineages, and small RNA sequencing to identify viRNAs derived from those viruses. We identified 21U small RNAs derived from an RNA virus in the brown alga, reminiscent of plant and fungal viRNAs, despite the deep divergence between these lineages. However, contrary to our expectations, we were unable to identify canonical (i.e. Drosophila- or nematode-like) viRNAs in any of the animals, despite the widespread presence of abundant micro-RNAs, and somatic transposon-derived piwi-interacting RNAs. We did identify a distinctive group of small RNAs derived from RNA viruses in the mollusc. However, unlike ecdysozoan viRNAs, these had a piRNA-like length distribution but lacked key signatures of piRNA biogenesis. We also identified primary piRNAs derived from putatively endogenous copies of DNA viruses in the cnidarian and the echinoderm, and an endogenous RNA virus in the mollusc. The absence of canonical virus-derived small RNAs from our samples may suggest that the majority of animal phyla lack an antiviral RNAi response. Alternatively, these phyla could possess an antiviral RNAi response resembling that reported for vertebrates, with cryptic viRNAs not detectable through simple metagenomic sequencing of wild-type individuals. In either case, our findings show that the antiviral RNAi responses of arthropods and nematodes, which are highly divergent from each other and from that of plants and fungi, are also highly diverged from the most likely ancestral metazoan state.
Collapse
Affiliation(s)
- Fergal M. Waldron
- Institute of Evolutionary Biology, University of Edinburgh, Ashworth Laboratories, Edinburgh, United Kingdom
| | - Graham N. Stone
- Institute of Evolutionary Biology, University of Edinburgh, Ashworth Laboratories, Edinburgh, United Kingdom
| | - Darren J. Obbard
- Institute of Evolutionary Biology, University of Edinburgh, Ashworth Laboratories, Edinburgh, United Kingdom
- Centre for Immunity Infection and Evolution, University of Edinburgh, Ashworth Laboratories, Edinburgh, United Kingdom
| |
Collapse
|
12
|
Wever R, Krenn BE, Renirie R. Marine Vanadium-Dependent Haloperoxidases, Their Isolation, Characterization, and Application. Methods Enzymol 2018; 605:141-201. [PMID: 29909824 DOI: 10.1016/bs.mie.2018.02.026] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Vanadium-dependent haloperoxidases in seaweeds, cyanobacteria, fungi, and possibly phytoplankton play an important role in the release of halogenated volatile compounds in the environment. These halocarbons have effects on atmospheric chemistry since they cause ozone depletion. In this chapter, a survey is given of the different sources of these enzymes, some of their properties, the various methods to isolate them, and the bottlenecks in purification. The assays to detect and quantify haloperoxidase activity are described as well as their kinetic properties. Several practical tips and pitfalls are given which have not yet been published explicitly. Recent developments in research on structure and function of these enzymes are reviewed. Finally, the application of vanadium-dependent haloperoxidases in the biosynthesis of brominated and other compounds is discussed.
Collapse
Affiliation(s)
- Ron Wever
- University of Amsterdam, Van't Hoff Institute for Molecular Sciences, Amsterdam, The Netherlands.
| | - Bea E Krenn
- University of Amsterdam, Innovation Exchange Amsterdam, Amsterdam, The Netherlands
| | - Rokus Renirie
- University of Amsterdam, Van't Hoff Institute for Molecular Sciences, Amsterdam, The Netherlands
| |
Collapse
|
13
|
Bernard M, Rousvoal S, Jacquemin B, Ballenghien M, Peters AF, Leblanc C. qPCR-based relative quantification of the brown algal endophyte Laminarionema elsbetiae in Saccharina latissima: variation and dynamics of host-endophyte interactions. JOURNAL OF APPLIED PHYCOLOGY 2018; 30:2901-2911. [PMID: 30416259 PMCID: PMC6208874 DOI: 10.1007/s10811-017-1367-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 12/06/2017] [Accepted: 12/06/2017] [Indexed: 05/11/2023]
Abstract
Morphological changes-such as dark spots, twisted stipes and deformed blades-have been observed in wild and cultivated Saccharina latissima. The putative cause for the disease symptoms is the filamentous endophytic brown alga Laminarionema elsbetiae, which is known to invade stipes and fronds of its hosts. Little is known about this interaction and its occurrence in the field, although former studies indicated high endophyte prevalence in kelp populations. Previous epidemiological studies on kelp endophytes were mainly based on the examination of microscopic sections, followed by time-consuming isolation and cultivation steps in order to identify the endophyte and a reliable method to quantify endophyte infections was missing. As a novel approach, we established and validated a qPCR assay for relative quantification of the endophyte L. elsbetiae within its host S. latissima, which allows to examine both, the prevalence of endophytic algae and the severity of infections. The assay was shown to be highly specific and suitable to reliably detect small amounts of endophyte DNA in the host. Using this method, we detected very high endophyte prevalence in the investigated kelp populations, up to 100% in young S. latissima sporophytes in Brittany during spring. Furthermore, our results suggest that Saccharina sporophytes are infected early in their life and that seasonality and environmental factors have a significant impact on infection rates. In the future, this approach could also be applied to study other host-endophyte pairs using specific primers.
Collapse
Affiliation(s)
- Miriam Bernard
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ. Paris 06, 29680 Roscoff, France
| | - Sylvie Rousvoal
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ. Paris 06, 29680 Roscoff, France
| | - Bertrand Jacquemin
- CNRS, UMI 3614, Evolutionary Biology and Ecology of Algae, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ. Paris 06, 29680 Roscoff, France
- Present Address: CEVA, 22610 Pleubian, France
| | - Marion Ballenghien
- CNRS, UMI 3614, Evolutionary Biology and Ecology of Algae, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ. Paris 06, 29680 Roscoff, France
| | | | - Catherine Leblanc
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ. Paris 06, 29680 Roscoff, France
| |
Collapse
|
14
|
Llansola-Portoles MJ, Litvin R, Ilioaia C, Pascal AA, Bina D, Robert B. Pigment structure in the violaxanthin-chlorophyll-a-binding protein VCP. PHOTOSYNTHESIS RESEARCH 2017; 134:51-58. [PMID: 28677008 DOI: 10.1007/s11120-017-0407-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 05/23/2017] [Indexed: 06/07/2023]
Abstract
Resonance Raman spectroscopy was used to evaluate pigment-binding site properties in the violaxanthin-chlorophyll-a-binding protein (VCP) from Nannochloropsis oceanica. The pigments bound to this antenna protein are chlorophyll-a, violaxanthin, and vaucheriaxanthin. The molecular structures of bound Chl-a molecules are discussed with respect to those of the plant antenna proteins LHCII and CP29, the crystal structures of which are known. We show that three populations of carotenoid molecules are bound by VCP, each of which is in an all-trans configuration. We assign the lower-energy absorption transition of each of these as follows. One violaxanthin population absorbs at 485 nm, while the second population is red-shifted and absorbs at 503 nm. The vaucheriaxanthin population absorbs at 525 nm, a position red-shifted by 2138 cm-1 as compared to isolated vaucheriaxanthin in n-hexane. The red-shifted violaxanthin is slightly less planar than the blue-absorbing one, as observed for the two central luteins in LHCII, and we suggest that these violaxanthins occupy the two equivalent binding sites in VCP at the centre of the cross-brace. The presence of a highly red-shifted vaucheriaxanthin in VCP is reminiscent of the situation of FCP, in which (even more) highly red-shifted populations of fucoxanthin are present. Tuning carotenoids to absorb in the green-yellow region of the visible spectrum appears to be a common evolutionary response to competition with other photosynthetic species in the aquatic environment.
Collapse
Affiliation(s)
- Manuel J Llansola-Portoles
- Institute for Integrative Biology of the Cell (I2BC), IBITECS, CEA, CNRS, Université Paris-Saclay, 91198, Gif-sur-Yvette Cedex, France.
| | - Radek Litvin
- Institute of Plant Molecular Biology, Biology Centre CAS, Branisovska 31, 370 05, Ceske Budejovice, Czech Republic
- Faculty of Science, University of South Bohemia, Branisovska 1760, 370 05, Ceske Budejovice, Czech Republic
| | - Cristian Ilioaia
- Institute for Integrative Biology of the Cell (I2BC), IBITECS, CEA, CNRS, Université Paris-Saclay, 91198, Gif-sur-Yvette Cedex, France
| | - Andrew A Pascal
- Institute for Integrative Biology of the Cell (I2BC), IBITECS, CEA, CNRS, Université Paris-Saclay, 91198, Gif-sur-Yvette Cedex, France
| | - David Bina
- Institute of Plant Molecular Biology, Biology Centre CAS, Branisovska 31, 370 05, Ceske Budejovice, Czech Republic
- Faculty of Science, University of South Bohemia, Branisovska 1760, 370 05, Ceske Budejovice, Czech Republic
| | - Bruno Robert
- Institute for Integrative Biology of the Cell (I2BC), IBITECS, CEA, CNRS, Université Paris-Saclay, 91198, Gif-sur-Yvette Cedex, France
| |
Collapse
|
15
|
Ritter A, Cabioch L, Brillet-Guéguen L, Corre E, Cosse A, Dartevelle L, Duruflé H, Fasshauer C, Goulitquer S, Thomas F, Correa JA, Potin P, Faugeron S, Leblanc C. Herbivore-induced chemical and molecular responses of the kelps Laminaria digitata and Lessonia spicata. PLoS One 2017; 12:e0173315. [PMID: 28253346 PMCID: PMC5333891 DOI: 10.1371/journal.pone.0173315] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2016] [Accepted: 02/17/2017] [Indexed: 01/04/2023] Open
Abstract
Kelps are founding species of temperate marine ecosystems, living in intertidal coastal areas where they are often challenged by generalist and specialist herbivores. As most sessile organisms, kelps develop defensive strategies to restrain grazing damage and preserve their own fitness during interactions with herbivores. To decipher some inducible defense and signaling mechanisms, we carried out metabolome and transcriptome analyses in two emblematic kelp species, Lessonia spicata from South Pacific coasts and Laminaria digitata from North Atlantic, when challenged with their main specialist herbivores. Mass spectrometry based metabolomics revealed large metabolic changes induced in these two brown algae following challenges with their own specialist herbivores. Targeted metabolic profiling of L. spicata further showed that free fatty acid (FFA) and amino acid (AA) metabolisms were particularly regulated under grazing. An early stress response was illustrated by the accumulation of Sulphur containing amino acids in the first twelve hours of herbivory pressure. At latter time periods (after 24 hours), we observed FFA liberation and eicosanoid oxylipins synthesis likely representing metabolites related to stress. Global transcriptomic analysis identified sets of candidate genes specifically induced by grazing in both kelps. qPCR analysis of the top candidate genes during a 48-hours time course validated the results. Most of these genes were particularly activated by herbivore challenge after 24 hours, suggesting that transcriptional reprogramming could be operated at this time period. We demonstrated the potential utility of these genes as molecular markers for herbivory by measuring their inductions in grazed individuals of field harvested L. digitata and L. spicata. By unravelling the regulation of some metabolites and genes following grazing pressure in two kelps representative of the two hemispheres, this work contributes to provide a set of herbivore-induced chemical and molecular responses in kelp species, showing similar inducible responses upon specialist herbivores in their respective ecosystems.
Collapse
Affiliation(s)
- Andrés Ritter
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
- Centro de Conservación Marina and CeBiB, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Léa Cabioch
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
- Centro de Conservación Marina and CeBiB, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Loraine Brillet-Guéguen
- Sorbonne Universités, UPMC University Paris 06, CNRS, FR2424, Analysis and Bioinformatics for Marine Science, Station Biologique, Roscoff, France
| | - Erwan Corre
- Sorbonne Universités, UPMC University Paris 06, CNRS, FR2424, Analysis and Bioinformatics for Marine Science, Station Biologique, Roscoff, France
| | - Audrey Cosse
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
| | - Laurence Dartevelle
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
| | - Harold Duruflé
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
| | - Carina Fasshauer
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
| | - Sophie Goulitquer
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
| | - François Thomas
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
| | - Juan A. Correa
- Centro de Conservación Marina and CeBiB, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMI 3614, Evolutionary Biology and Ecology of Algae, Station Biologique, Roscoff, France
| | - Philippe Potin
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
| | - Sylvain Faugeron
- Centro de Conservación Marina and CeBiB, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMI 3614, Evolutionary Biology and Ecology of Algae, Station Biologique, Roscoff, France
| | - Catherine Leblanc
- Sorbonne Universités, UPMC University Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique, Roscoff, France
| |
Collapse
|
16
|
Rousvoal S, Bouyer B, López-Cristoffanini C, Boyen C, Collén J. Mutant swarms of a totivirus-like entities are present in the red macroalga Chondrus crispus and have been partially transferred to the nuclear genome. JOURNAL OF PHYCOLOGY 2016; 52:493-504. [PMID: 27151076 DOI: 10.1111/jpy.12427] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 03/15/2016] [Indexed: 06/05/2023]
Abstract
Chondrus crispus Stackhouse (Gigartinales) is a red seaweed found on North Atlantic rocky shores. Electrophoresis of RNA extracts showed a prominent band with a size of around 6,000 bp. Sequencing of the band revealed several sequences with similarity to totiviruses, double-stranded RNA viruses that normally infect fungi. This virus-like entity was named C. crispus virus (CcV). It should probably be regarded as an extreme viral quasispecies or a mutant swarm since low identity (<65%) was found between sequences. Totiviruses typically code for two genes: one capsid gene (gag) and one RNA-dependent RNA polymerase gene (pol) with a pseudoknot structure between the genes. Both the genes and the intergenic structures were found in the CcV sequences. A nonidentical gag gene was also found in the nuclear genome of C. crispus, with associated expressed sequence tags (EST) and upstream regulatory features. The gene was presumably horizontally transferred from the virus to the alga. Similar dsRNA bands were seen in extracts from different life cycle stages of C. crispus and from all geographic locations tested. In addition, similar bands were also observed in RNA extractions from other red algae; however, the significance of this apparently widespread phenomenon is unknown. Neither phenotype caused by the infection nor any virus particles or capsid proteins were identified; thus, the presence of viral particles has not been validated. These findings increase the known host range of totiviruses to include marine red algae.
Collapse
Affiliation(s)
- Sylvie Rousvoal
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France
- UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France
| | - Betty Bouyer
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France
- UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France
| | - Camilo López-Cristoffanini
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France
- UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France
| | - Catherine Boyen
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France
- UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France
| | - Jonas Collén
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France
- UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France
| |
Collapse
|
17
|
A sex-inducing pheromone triggers cell cycle arrest and mate attraction in the diatom Seminavis robusta. Sci Rep 2016; 6:19252. [PMID: 26786712 PMCID: PMC4726125 DOI: 10.1038/srep19252] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 12/04/2015] [Indexed: 01/15/2023] Open
Abstract
Although sexual reproduction is believed to play a major role in the high diversification rates and species richness of diatoms, a mechanistic understanding of diatom life cycle control is virtually lacking. Diatom sexual signalling is controlled by a complex, yet largely unknown, pheromone system. Here, a sex-inducing pheromone (SIP+) of the benthic pennate diatom Seminavis robusta was identified by comparative metabolomics, subsequently purified, and physicochemically characterized. Transcriptome analysis revealed that SIP+ triggers the switch from mitosis-to-meiosis in the opposing mating type, coupled with the transcriptional induction of proline biosynthesis genes, and the release of the proline-derived attraction pheromone. The induction of cell cycle arrest by a pheromone, chemically distinct from the one used to attract the opposite mating type, highlights the existence of a sophisticated mechanism to increase chances of mate finding, while keeping the metabolic losses associated with the release of an attraction pheromone to a minimum.
Collapse
|
18
|
Creis E, Delage L, Charton S, Goulitquer S, Leblanc C, Potin P, Ar Gall E. Constitutive or Inducible Protective Mechanisms against UV-B Radiation in the Brown Alga Fucus vesiculosus? A Study of Gene Expression and Phlorotannin Content Responses. PLoS One 2015; 10:e0128003. [PMID: 26030665 PMCID: PMC4452539 DOI: 10.1371/journal.pone.0128003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 04/21/2015] [Indexed: 11/18/2022] Open
Abstract
A role as UV sunscreens has been suggested for phlorotannins, the phenolic compounds that accumulate in brown algae in response to a number of external stimuli and take part in cell wall structure. After exposure of the intertidal brown alga Fucus vesiculosus to artificial UV-B radiation, we examined its physiological responses by following the transcript level of the pksIII gene encoding a phloroglucinol synthase, likely to be involved in the first step of phlorotannins biosynthesis. We also monitored the expression of three targeted genes, encoding a heat shock protein (hsp70), which is involved in global stress responses, an aryl sulfotransferase (ast), which could be involved in the sulfation of phlorotannins, and a vanadium bromoperoxidase (vbpo), which can potentially participate in the scavenging of Reactive Oxygen Species (ROS) and in the cross-linking and condensation of phlorotannins. We investigated whether transcriptional regulation of these genes is correlated with an induction of phlorotannin accumulation by establishing metabolite profiling of purified fractions of low molecular weight phlorotannins. Our findings demonstrated that a high dose of UV-B radiation induced a significant overexpression of hsp70 after 12 and 24 hours following the exposure to the UV-B treatment, compared to control treatment. The physiological performance of algae quantified by the photosynthetic efficiency (Fv/Fm) was slightly reduced. However UV-B treatment did not induce the accumulation of soluble phlorotannins in F. vesiculosus during the kinetics of four weeks, a result that may be related to the lack of induction of the pksIII gene expression. Taken together these results suggest a constitutive accumulation of phlorotannins occurring during the development of F.vesiculosus, rather than inducible processes. Gene expression studies and phlorotannin profiling provide here complementary approaches to global quantifications currently used in studies of phenolic compounds in brown algae.
Collapse
Affiliation(s)
- Emeline Creis
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Ludovic Delage
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Sophie Charton
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Sophie Goulitquer
- Centre de Ressources de Biologie Marine, MetaboMer Mass Spectrometry Core Facility, CNRS FR2424, Station Biologique de Roscoff, 29688, Roscoff cedex, Brittany, France
| | - Catherine Leblanc
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Philippe Potin
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Erwan Ar Gall
- Université Européenne de Bretagne, Université de Bretagne Occidentale, Laboratoire des Sciences de l’Environnement Marin, Unité Mixte de Recherche, Centre National de la Recherche Scientifique 6539, Institut Européen d’Etudes Marines-IUEM, 29280, Plouzané, Brittany, France
| |
Collapse
|
19
|
Lipinska A, Cormier A, Luthringer R, Peters AF, Corre E, Gachon CMM, Cock JM, Coelho SM. Sexual dimorphism and the evolution of sex-biased gene expression in the brown alga ectocarpus. Mol Biol Evol 2015; 32:1581-97. [PMID: 25725430 DOI: 10.1093/molbev/msv049] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Males and females often have marked phenotypic differences, and the expression of these dissimilarities invariably involves sex differences in gene expression. Sex-biased gene expression has been well characterized in animal species, where a high proportion of the genome may be differentially regulated in males and females during development. Male-biased genes tend to evolve more rapidly than female-biased genes, implying differences in the strength of the selective forces acting on the two sexes. Analyses of sex-biased gene expression have focused on organisms that exhibit separate sexes during the diploid phase of the life cycle (diploid sexual systems), but the genetic nature of the sexual system is expected to influence the evolutionary trajectories of sex-biased genes. We analyze here the patterns of sex-biased gene expression in Ectocarpus, a brown alga with haploid sex determination (dioicy) and a low level of phenotypic sexual dimorphism. In Ectocarpus, female-biased genes were found to be evolving as rapidly as male-biased genes. Moreover, genes expressed at fertility showed faster rates of evolution than genes expressed in immature gametophytes. Both male- and female-biased genes had a greater proportion of sites experiencing positive selection, suggesting that their accelerated evolution is at least partly driven by adaptive evolution. Gene duplication appears to have played a significant role in the generation of sex-biased genes in Ectocarpus, expanding previous models that propose this mechanism for the resolution of sexual antagonism in diploid systems. The patterns of sex-biased gene expression in Ectocarpus are consistent both with predicted characteristics of UV (haploid) sexual systems and with the distinctive aspects of this organism's reproductive biology.
Collapse
Affiliation(s)
- Agnieszka Lipinska
- Sorbonne Université, UPMC Univ Paris 06, CNRS, Algal Genetics Group, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff, France
| | - Alexandre Cormier
- Sorbonne Université, UPMC Univ Paris 06, CNRS, Algal Genetics Group, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff, France
| | - Rémy Luthringer
- Sorbonne Université, UPMC Univ Paris 06, CNRS, Algal Genetics Group, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff, France
| | | | - Erwan Corre
- Abims Platform, CNRS-UPMC, FR2424, Station Biologique de Roscoff, Roscoff, France
| | - Claire M M Gachon
- Microbial and Molecular Biology Department, Scottish Marine Institute, Scottish Association for Marine Science, Oban, United Kingdom
| | - J Mark Cock
- Sorbonne Université, UPMC Univ Paris 06, CNRS, Algal Genetics Group, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff, France
| | - Susana M Coelho
- Sorbonne Université, UPMC Univ Paris 06, CNRS, Algal Genetics Group, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff, France
| |
Collapse
|
20
|
Roncarati F, Sáez CA, Greco M, Gledhill M, Bitonti MB, Brown MT. Response differences between Ectocarpus siliculosus populations to copper stress involve cellular exclusion and induction of the phytochelatin biosynthetic pathway. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2015; 159:167-75. [PMID: 25546007 DOI: 10.1016/j.aquatox.2014.12.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 12/09/2014] [Accepted: 12/10/2014] [Indexed: 06/04/2023]
Abstract
Some populations of brown seaweed species inhabit metal-polluted environments and can develop tolerance to metal stress, but the mechanisms by which this is accomplished are still to be elucidated. To address this, the responses of two strains of the model brown alga Ectocarpus siliculosus isolated from sites with different histories of metal contamination exposed to total copper (CuT) concentrations ranging between 0 and 2.4 μM for 10 days were investigated. The synthesis of the metal-chelator phytochelatin (PCs) and relative levels of transcripts encoding the enzymes γ-glutamylcysteine synthetase (γ-GCS), glutathione synthase (GS) and phytochelatin synthase (PCS) that participate in the PC biosynthetic pathway were measured, along with the effects on growth, and adsorption and uptake of Cu. Growth of strain LIA, from a pristine site in Scotland, was inhibited to a greater extent, and at lower concentrations, than that of Es524, isolated from a Cu-contaminated site in Chile. Concentrations of intra-cellular Cu were higher and the exchangeable fraction was lower in LIA than Es524, especially at the highest exposure levels. Total glutathione concentrations increased in both strains with Cu exposure, whereas total PCs levels were higher in Es524 than LIA; PC2 and PC3 were detected in Es524 but PC2 only was found in LIA. The greater production and levels of polymerisation of PCs in Es524 can be explained by the up-regulation of genes encoding for key enzymes involved in the synthesis of PCs. In Es524 there was an increase in the transcripts of γ-GCS, GS and PCS, particularly under high Cu exposure, whereas in LIA4 transcripts of γ-GCS1 increased only slightly, γ-GCS2 and GS decreased and PCS did not change. The consequences of higher intra-cellular concentrations of Cu, lower production of PCs, and lower expression of enzymes involved in GSH-PCs synthesis may be contributing to an induced oxidative stress condition in LIA, which explains, at least in part, the observed sensitivity of LIA to Cu. Therefore, responses to Cu exposure in E. siliculosus relate to the contamination histories of the locations from where the strains were isolated and differences in Cu exclusion and PCs production are in part responsible for the development of intra-specific resistance.
Collapse
Affiliation(s)
- Francesca Roncarati
- School of Marine Science and Engineering, Faculty of Science and Environment, Plymouth University, Drake Circus, Plymouth PL4 8AA, UK
| | - Claudio A Sáez
- School of Marine Science and Engineering, Faculty of Science and Environment, Plymouth University, Drake Circus, Plymouth PL4 8AA, UK; Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, casilla 40 correo 33, Santiago, Chile; Departamento de Medio Ambiente, Facultad de Ingeniería, Universidad de Playa Ancha, Casilla 34-V, Valparaíso, Chile
| | - Maria Greco
- Laboratory of Plant Cyto-Physiology, University of Calabria, Arcavata di Rende, Cosenza 87036, Italy
| | - Martha Gledhill
- Helmholtz Centre for Ocean Research, GEOMAR, Wischhofstrasse 1-3, Build. 12, D-24148 Kiel, Germany
| | - Maria B Bitonti
- Laboratory of Plant Cyto-Physiology, University of Calabria, Arcavata di Rende, Cosenza 87036, Italy
| | - Murray T Brown
- School of Marine Science and Engineering, Faculty of Science and Environment, Plymouth University, Drake Circus, Plymouth PL4 8AA, UK.
| |
Collapse
|
21
|
Thomas F, Cosse A, Le Panse S, Kloareg B, Potin P, Leblanc C. Kelps feature systemic defense responses: insights into the evolution of innate immunity in multicellular eukaryotes. THE NEW PHYTOLOGIST 2014; 204:567-576. [PMID: 25041157 DOI: 10.1111/nph.12925] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 06/09/2014] [Indexed: 06/03/2023]
Abstract
Brown algae are one of the few eukaryotic lineages that have evolved complex multicellularity, together with Opisthokonts (animals, fungi) and Plantae (land plants, green and red algae). In these three lineages, biotic stresses induce similar local defense reactions. Animals and land plants also feature a systemic immune response, protecting the whole organism after an attack on one of its parts. However, the occurrence of systemic defenses has never been investigated in brown algae. We elicited selected parts of the kelp Laminaria digitata and monitored distant, nonchallenged areas of the same individual for subsequent defense reactions. A systemic reaction was detected following elicitation on a distant area, including an oxidative response, an increase in haloperoxidase activities and a stronger resistance against herbivory. Based on experiments with pharmacological inhibitors, the liberation of free fatty acids is proposed to play a key role in systemic signaling, reminiscent of what is known in land plants. This study is the first report, outside the phyla of Opisthokonts and Plantae, of an intraorganism communication leading to defense reactions. These findings indicate that systemic immunity emerged independently at least three times, as a consequence of convergent evolution in multicellular eukaryotic lineages.
Collapse
Affiliation(s)
- François Thomas
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
| | - Audrey Cosse
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
| | - Sophie Le Panse
- Sorbonne Universités, UPMC Univ Paris 06, FR 2424, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
- CNRS, FR 2424, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
| | - Bernard Kloareg
- Sorbonne Universités, UPMC Univ Paris 06, FR 2424, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
- CNRS, FR 2424, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
| | - Philippe Potin
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
| | - Catherine Leblanc
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff Cedex, France
| |
Collapse
|
22
|
Flöthe CR, Molis M, John U. Induced resistance to periwinkle grazing in the brown seaweed Fucus vesiculosus (Phaeophyceae): molecular insights and seaweed-mediated effects on herbivore interactions. JOURNAL OF PHYCOLOGY 2014; 50:564-576. [PMID: 26988328 DOI: 10.1111/jpy.12186] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 03/20/2014] [Indexed: 06/05/2023]
Abstract
Herbivory is a key factor for controlling seaweed biomass and community structure. To cope with grazers, constitutive and inducible defenses have evolved in macroalgae. Inducible chemical defenses show grazer-specificity and, at the same time, have the potential to mediate interactions among different herbivores. Furthermore, temporal variations in defense patterns, which may adjust antiherbivory responses to grazing pressure, were reported in two brown seaweeds. However, underlying cellular processes are only rudimentarily characterized. To investigate the response of Fucus vesiculosus (L.) to periwinkle (Littorina obtusata) grazing, feeding assays were conducted at several times during a 33 d induction experiment. Underlying cellular processes were analyzed through gene expression profiling. Furthermore, direct processes driving the antiherbivory response to periwinkle grazing and indirect effects on another herbivore, the isopod Idotea baltica, were elucidated. F. vesiculosus showed multiple defense pulses in response to periwinkle grazing, suggesting a high level of temporal variability in antiherbivory traits. Defense induction was accompanied by extensive transcriptome changes. Approximately 400 genes were significantly up-/down-regulated relative to controls, including genes relevant for translation and the cytoskeleton. Genes involved in photosynthesis were mostly down-regulated, while genes related to the respiratory chain were up-regulated, indicating alterations in resource allocation. The comparison of genes regulated in response to isopod (previous study) and periwinkle grazing suggests specific induction of several genes by each herbivore. However, grazing by both herbivores induced similar metabolic processes in F. vesiculosus. These common defense-related processes reflected in strong indirect effects as isopods were also repelled after previous grazing by L. obtusata.
Collapse
Affiliation(s)
- Carla R Flöthe
- Section Ecological Chemistry, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, Bremerhaven, 27570, Germany
| | - Markus Molis
- Section Functional Ecology, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, Bremerhaven, 27570, Germany
| | - Uwe John
- Section Ecological Chemistry, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, Bremerhaven, 27570, Germany
| |
Collapse
|
23
|
Ritter A, Dittami SM, Goulitquer S, Correa JA, Boyen C, Potin P, Tonon T. Transcriptomic and metabolomic analysis of copper stress acclimation in Ectocarpus siliculosus highlights signaling and tolerance mechanisms in brown algae. BMC PLANT BIOLOGY 2014; 14:116. [PMID: 24885189 PMCID: PMC4108028 DOI: 10.1186/1471-2229-14-116] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 04/22/2014] [Indexed: 05/23/2023]
Abstract
BACKGROUND Brown algae are sessile macro-organisms of great ecological relevance in coastal ecosystems. They evolved independently from land plants and other multicellular lineages, and therefore hold several original ontogenic and metabolic features. Most brown algae grow along the coastal zone where they face frequent environmental changes, including exposure to toxic levels of heavy metals such as copper (Cu). RESULTS We carried out large-scale transcriptomic and metabolomic analyses to decipher the short-term acclimation of the brown algal model E. siliculosus to Cu stress, and compared these data to results known for other abiotic stressors. This comparison demonstrates that Cu induces oxidative stress in E. siliculosus as illustrated by the transcriptomic overlap between Cu and H2O2 treatments. The common response to Cu and H2O2 consisted in the activation of the oxylipin and the repression of inositol signaling pathways, together with the regulation of genes coding for several transcription-associated proteins. Concomitantly, Cu stress specifically activated a set of genes coding for orthologs of ABC transporters, a P1B-type ATPase, ROS detoxification systems such as a vanadium-dependent bromoperoxidase, and induced an increase of free fatty acid contents. Finally we observed, as a common abiotic stress mechanism, the activation of autophagic processes on one hand and the repression of genes involved in nitrogen assimilation on the other hand. CONCLUSIONS Comparisons with data from green plants indicate that some processes involved in Cu and oxidative stress response are conserved across these two distant lineages. At the same time the high number of yet uncharacterized brown alga-specific genes induced in response to copper stress underlines the potential to discover new components and molecular interactions unique to these organisms. Of particular interest for future research is the potential cross-talk between reactive oxygen species (ROS)-, myo-inositol-, and oxylipin signaling.
Collapse
Affiliation(s)
- Andrés Ritter
- UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, CS 90074, F-29688 Roscoff cedex, France
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
- Departamento de Ecología, Center of Applied Ecology & Sustainability, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
- Present addresses: Department of Plant Systems Biology, VIB and Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, Ghent B-9052, Belgium
| | - Simon M Dittami
- UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, CS 90074, F-29688 Roscoff cedex, France
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
| | - Sophie Goulitquer
- Plate-forme MetaboMER, CNRS & UPMC, FR2424, Station Biologique, 29680 Roscoff, France
| | - Juan A Correa
- Departamento de Ecología, Center of Applied Ecology & Sustainability, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Catherine Boyen
- UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, CS 90074, F-29688 Roscoff cedex, France
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
| | - Philippe Potin
- UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, CS 90074, F-29688 Roscoff cedex, France
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
| | - Thierry Tonon
- UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, CS 90074, F-29688 Roscoff cedex, France
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
| |
Collapse
|
24
|
Bodyl A. Mechanism of Protein Targeting to the Chlorarachniophyte Plastids and the Evolution of Complex Plastids with Four Membranes - A Hypothesis. ACTA ACUST UNITED AC 2014. [DOI: 10.1111/j.1438-8677.1997.tb00655.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
25
|
Rhiel E, Marquardt J, Eppard M, Mörschel E, Krumbein WE. The Light Harvesting System of the DiatomCyclotella cryptica. Isolation and Characterization of the Main Light Harvesting Complex and Evidence for the Existence of Minor Pigment Proteins*. ACTA ACUST UNITED AC 2014. [DOI: 10.1111/j.1438-8677.1997.tb00617.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
26
|
Konotchick T, Dupont CL, Valas RE, Badger JH, Allen AE. Transcriptomic analysis of metabolic function in the giant kelp, Macrocystis pyrifera, across depth and season. THE NEW PHYTOLOGIST 2013; 198:398-407. [PMID: 23488966 PMCID: PMC3644879 DOI: 10.1111/nph.12160] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 12/10/2012] [Indexed: 05/30/2023]
Abstract
To increase knowledge of transcript diversity for the giant kelp, Macrocystis pyrifera, and assess gene expression across naturally occurring depth gradients in light, temperature and nutrients, we sequenced four cDNA libraries created from blades collected at the sea surface and at 18 m depth during the winter and summer. Comparative genomics cluster analyses revealed novel gene families (clusters) in existing brown alga expressed sequence tag data compared with other related algal groups, a pattern also seen with the addition of M. pyrifera sequences. Assembly of 228 Mbp of sequence generated c. 9000 isotigs and c. 12,000 open reading frames. Annotations were assigned using families of hidden Markov models for c. 11% of open reading frames; M. pyrifera had highest similarity to other members of the Phaeophyceae, namely Ectocarpus siliculosus and Laminaria digitata. Quantitative polymerase chain reaction of transcript targets verified depth-related differences in gene expression; stress response and light-harvesting transcripts, especially members of the LI818 (also known as LHCSR) family, showed high expression in the surface compared with 18 m depth, while some nitrogen acquisition transcripts (e.g. nitrite reductase) were upregulated at depth compared with the surface, supporting a conceptual biological model of depth-dependent physiology.
Collapse
Affiliation(s)
- Talina Konotchick
- J. Craig Venter Institute, 10355 Science Center Drive, San Diego, CA, USA
| | | | - Ruben E Valas
- J. Craig Venter Institute, 10355 Science Center Drive, San Diego, CA, USA
| | - Jonathan H Badger
- J. Craig Venter Institute, 10355 Science Center Drive, San Diego, CA, USA
| | - Andrew E Allen
- J. Craig Venter Institute, 10355 Science Center Drive, San Diego, CA, USA
| |
Collapse
|
27
|
Wischang D, Radlow M, Schulz H, Vilter H, Viehweger L, Altmeyer MO, Kegler C, Herrmann J, Müller R, Gaillard F, Delage L, Leblanc C, Hartung J. Molecular cloning, structure, and reactivity of the second bromoperoxidase from Ascophyllum nodosum. Bioorg Chem 2012; 44:25-34. [PMID: 22884431 DOI: 10.1016/j.bioorg.2012.05.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 04/30/2012] [Accepted: 05/21/2012] [Indexed: 11/16/2022]
Abstract
The sequence of bromoperoxidase II from the brown alga Ascophyllum nodosum was determined from a full length cloned cDNA, obtained from a tandem mass spectrometry RT-PCR-approach. The clone encodes a protein composed of 641 amino-acids, which provides a mature 67.4 kDa-bromoperoxidase II-protein (620 amino-acids). Based on 43% sequence homology with the previously characterized bromoperoxidase I from A. nodosum, a tertiary structure was modeled for the bromoperoxidase II. The structural model was refined on the basis of results from gel filtration and vanadate-binding studies, showing that the bromoperoxidase II is a hexameric metalloprotein, which binds 0.5 equivalents of vanadate as cofactor per 67.4 kDa-subunit, for catalyzing oxidation of bromide by hydrogen peroxide in a bi-bi-ping-pong mechanism (k(cat) = 153 s(-1), 22 °C, pH 5.9). Bromide thereby is converted into a bromoelectrophile of reactivity similar to molecular bromine, based on competition kinetic data on phenol bromination and correlation analysis. Reactivity provided by the bromoperoxidase II mimics biosynthesis of methyl 4-bromopyrrole-2-carboxylate, a natural product isolated from the marine sponge Axinella tenuidigitata.
Collapse
Affiliation(s)
- Diana Wischang
- Fachbereich Chemie, Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, D-67663 Kaiserslautern, Germany
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Dittami SM, Gravot A, Goulitquer S, Rousvoal S, Peters AF, Bouchereau A, Boyen C, Tonon T. Towards deciphering dynamic changes and evolutionary mechanisms involved in the adaptation to low salinities in Ectocarpus (brown algae). THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2012; 71:366-77. [PMID: 22394375 DOI: 10.1111/j.1365-313x.2012.04982.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Colonizations of freshwater by marine species are rare events, and little information is known about the underlying mechanisms. Brown algae are an independent lineage of photosynthetic and multicellular organisms from which few species inhabit freshwater. As a marine alga that is also found in freshwater, Ectocarpus is of particular interest for studying the transition between these habitats. To gain insights into mechanisms of the transition, we examined salinity tolerance and adaptations to low salinities in a freshwater strain of Ectocarpus on physiological and molecular levels. We show that this isolate belongs to a widely distributed and highly stress-resistant clade, and differed from the genome-sequenced marine strain in its tolerance of low salinities. It also exhibited profound, but reversible, morphological, physiological, and transcriptomic changes when transferred to seawater. Although gene expression profiles were similar in both strains under identical conditions, metabolite and ion profiles differed strongly, the freshwater strain exhibiting e.g. higher cellular contents of amino acids and nitrate, higher contents of n-3 fatty acids, and lower intracellular mannitol and sodium concentrations. Moreover, several stress markers were noted in the freshwater isolate in seawater. This finding suggests that, while high stress tolerance and plasticity may be prerequisites for the colonization of freshwater, genomic alterations have occurred that produced permanent changes in the metabolite profiles to stabilize the transition.
Collapse
Affiliation(s)
- Simon M Dittami
- UPMC Univ Paris 6, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680, Roscoff, France
| | | | | | | | | | | | | | | |
Collapse
|
29
|
Fujii R, Kita M, Iinuma Y, Oka N, Takaesu Y, Taira T, Iha M, Cogdell RJ, Hashimoto H. Isolation and purification of the major photosynthetic antenna, fucoxanthin-Chl a/c protein, from cultured discoid germilings of the brown Alga, Cladosiphon okamuranus TOKIDA (Okinawa Mozuku). PHOTOSYNTHESIS RESEARCH 2012; 111:157-63. [PMID: 21948618 DOI: 10.1007/s11120-011-9688-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Accepted: 09/12/2011] [Indexed: 05/31/2023]
Abstract
A chlorophyll c binding membrane intrinsic light-harvesting complex, the fucoxanthin-chlorophyll a/c protein (FCP), was isolated from cultured discoid germilings of an edible Japanese brown alga, Cladosiphon (C.) okamuranus TOKIDA (Okinawa Mozuku in Japanese). The discoid germiling is an ideal source of brown algal photosynthetic pigment-protein complexes in terms of its size and easiness of cultivation on a large scale. Ion-exchange chromatography was crucial for the purification of FCP from solubilized thylakoid proteins. The molecular weight of the purified FCP assembly was estimated to be ~56 kDa using blue native-PAGE. Further subunit analyses using 2D-PAGE revealed that the FCP assembled as a trimer consisting of two distinguishable subunits having molecular weights of 18.2 (H) and 17.5 (L) kDa. Fluorescence and fluorescence-excitation spectra confirmed that the purified FCP assembly was functionally intact.
Collapse
Affiliation(s)
- Ritsuko Fujii
- The OCU Advanced Research Institute for Natural Science and Technology (OCARINA), 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Minami S, Sato M, Shiraiwa Y, Iwamoto K. Molecular characterization of adenosine 5'-monophosphate deaminase--the key enzyme responsible for the umami taste of nori (Porphyra yezoensis Ueda, Rhodophyta). MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2011; 13:1140-1147. [PMID: 21519809 DOI: 10.1007/s10126-011-9377-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Accepted: 03/22/2011] [Indexed: 05/30/2023]
Abstract
The enzyme adenosine 5'-monophosphate deaminase (AMPD, EC 3.5.4.6) catalyzes the conversion of adenosine 5'-monophosphate to inosine 5'-mononucleotide (IMP). IMP is generally known as the compound responsible for the umami taste of the edible red alga Porphyra yezoensis Ueda that is known in Japan as nori. Therefore, we suspect that AMPD plays a key role in providing a favorable nori taste. In this study, we undertake the molecular characterization of nori-derived AMPD. The nori AMPD protein has a molecular mass of 55 kDa as estimated from both gel filtration and sodium dodecyl sulfate polyacrylamide gel electrophoresis. The calculated molecular mass from the amino acid sequence deduced from cDNA is 57.1 kDa. The isoelectric point is 5.71. The coding region of AMPD consists of 1,566 bp encoding 522 amino acids and possesses a transmembrane domain and two N-glycosylation sites. The sequence identity of nori AMPD in human and yeast AMPDs was found to be less than 50% and 20% in DNA and amino acid sequences, respectively. Proline in the conserved motif of [SA]-[LIVM]-[NGS]-[STA]-D-D-P was found to be converted to glutamate. These results indicate that nori AMPD is a novel type of AMPD.
Collapse
Affiliation(s)
- Seiko Minami
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 985-8555, Japan
| | | | | | | |
Collapse
|
31
|
Thomas F, Cosse A, Goulitquer S, Raimund S, Morin P, Valero M, Leblanc C, Potin P. Waterborne signaling primes the expression of elicitor-induced genes and buffers the oxidative responses in the brown alga Laminaria digitata. PLoS One 2011; 6:e21475. [PMID: 21731761 PMCID: PMC3123347 DOI: 10.1371/journal.pone.0021475] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Accepted: 06/01/2011] [Indexed: 12/23/2022] Open
Abstract
As marine sessile organisms, seaweeds must respond efficiently to biotic and abiotic challenges in their natural environment to reduce the fitness consequences of wounds and oxidative stress. This study explores the early steps of the defense responses of a large marine brown alga (the tangle kelp Laminaria digitata) and investigates its ability to transmit a warning message to neighboring conspecifics. We compared the early responses to elicitation with oligoguluronates in laboratory-grown and harvested wild individuals of L. digitata. We followed the release of H₂O₂ and the concomitant production of volatile organic compounds. We also monitored the kinetics of expression of defense-related genes following the oxidative burst. Laboratory-grown algae were transplanted in kelp habitats to further evaluate their responses to elicitation after a transient immersion in natural seawater. In addition, a novel conditioning procedure was established to mimic field conditions in the laboratory. Our experiments showed that L. digitata integrates waterborne cues present in the kelp bed and/or released from elicited neighboring plants. Indeed, the exposure to elicited conspecifics changes the patterns of oxidative burst and volatile emissions and potentiates this kelp for faster induction of genes specifically regulated in response to oligoguluronates. Thus, waterborne signals shape the elicitor-induced responses of kelps through a yet unknown mechanism reminiscent of priming in land plants.
Collapse
Affiliation(s)
- François Thomas
- Marine Plants and Biomolecules Laboratory, Unité Mixte de Recherche 7139, Station Biologique de Roscoff, Université Pierre et Marie Curie, Roscoff, France
- Unité Mixte de Recherche 7139, Station Biologique, Centre National de la Recherche Scientifique (CNRS), Roscoff, France
| | - Audrey Cosse
- Marine Plants and Biomolecules Laboratory, Unité Mixte de Recherche 7139, Station Biologique de Roscoff, Université Pierre et Marie Curie, Roscoff, France
- Unité Mixte de Recherche 7139, Station Biologique, Centre National de la Recherche Scientifique (CNRS), Roscoff, France
| | - Sophie Goulitquer
- Laboratoire de Biochimie, Epissage, Cancer, Lipides et Apoptose, Unit 613, Institut National de la Santé et de la Recherche Médicale, Faculté de Médecine, Université de Bretagne Occidentale, Brest, France
| | - Stefan Raimund
- Adaptation et Diversité en Milieu Marin, Unité Mixte de Recherche 7144, Station Biologique, Université Pierre et Marie Curie, Roscoff, France
- Unité Mixte de Recherche 7144, Adaptation et Diversité en Milieu Marin, Station Biologique, Centre National de la Recherche Scientifique (CNRS), Roscoff, France
| | - Pascal Morin
- Adaptation et Diversité en Milieu Marin, Unité Mixte de Recherche 7144, Station Biologique, Université Pierre et Marie Curie, Roscoff, France
- Unité Mixte de Recherche 7144, Adaptation et Diversité en Milieu Marin, Station Biologique, Centre National de la Recherche Scientifique (CNRS), Roscoff, France
| | - Myriam Valero
- Adaptation et Diversité en Milieu Marin, Unité Mixte de Recherche 7144, Station Biologique, Université Pierre et Marie Curie, Roscoff, France
- Unité Mixte de Recherche 7144, Adaptation et Diversité en Milieu Marin, Station Biologique, Centre National de la Recherche Scientifique (CNRS), Roscoff, France
| | - Catherine Leblanc
- Marine Plants and Biomolecules Laboratory, Unité Mixte de Recherche 7139, Station Biologique de Roscoff, Université Pierre et Marie Curie, Roscoff, France
- Unité Mixte de Recherche 7139, Station Biologique, Centre National de la Recherche Scientifique (CNRS), Roscoff, France
| | - Philippe Potin
- Marine Plants and Biomolecules Laboratory, Unité Mixte de Recherche 7139, Station Biologique de Roscoff, Université Pierre et Marie Curie, Roscoff, France
- Unité Mixte de Recherche 7139, Station Biologique, Centre National de la Recherche Scientifique (CNRS), Roscoff, France
| |
Collapse
|
32
|
Evolution of light-harvesting complex proteins from Chl c-containing algae. BMC Evol Biol 2011; 11:101. [PMID: 21496217 PMCID: PMC3096602 DOI: 10.1186/1471-2148-11-101] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Accepted: 04/15/2011] [Indexed: 11/10/2022] Open
Abstract
Background Light harvesting complex (LHC) proteins function in photosynthesis by binding chlorophyll (Chl) and carotenoid molecules that absorb light and transfer the energy to the reaction center Chl of the photosystem. Most research has focused on LHCs of plants and chlorophytes that bind Chl a and b and extensive work on these proteins has uncovered a diversity of biochemical functions, expression patterns and amino acid sequences. We focus here on a less-studied family of LHCs that typically bind Chl a and c, and that are widely distributed in Chl c-containing and other algae. Previous phylogenetic analyses of these proteins suggested that individual algal lineages possess proteins from one or two subfamilies, and that most subfamilies are characteristic of a particular algal lineage, but genome-scale datasets had revealed that some species have multiple different forms of the gene. Such observations also suggested that there might have been an important influence of endosymbiosis in the evolution of LHCs. Results We reconstruct a phylogeny of LHCs from Chl c-containing algae and related lineages using data from recent sequencing projects to give ~10-fold larger taxon sampling than previous studies. The phylogeny indicates that individual taxa possess proteins from multiple LHC subfamilies and that several LHC subfamilies are found in distantly related algal lineages. This phylogenetic pattern implies functional differentiation of the gene families, a hypothesis that is consistent with data on gene expression, carotenoid binding and physical associations with other LHCs. In all probability LHCs have undergone a complex history of evolution of function, gene transfer, and lineage-specific diversification. Conclusion The analysis provides a strikingly different picture of LHC diversity than previous analyses of LHC evolution. Individual algal lineages possess proteins from multiple LHC subfamilies. Evolutionary relationships showed support for the hypothesized origin of Chl c plastids. This work also allows recent experimental findings about molecular function to be understood in a broader phylogenetic context.
Collapse
|
33
|
Sato S. The apicomplexan plastid and its evolution. Cell Mol Life Sci 2011; 68:1285-96. [PMID: 21380560 PMCID: PMC3064897 DOI: 10.1007/s00018-011-0646-1] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Revised: 02/15/2011] [Accepted: 02/15/2011] [Indexed: 11/24/2022]
Abstract
Protistan species belonging to the phylum Apicomplexa have a non-photosynthetic secondary plastid-the apicoplast. Although its tiny genome and even the entire nuclear genome has been sequenced for several organisms bearing the organelle, the reason for its existence remains largely obscure. Some of the functions of the apicoplast, including housekeeping ones, are significantly different from those of other plastids, possibly due to the organelle's unique symbiotic origin.
Collapse
Affiliation(s)
- Shigeharu Sato
- Division of Parasitology, MRC National Institute for Medical Research, Mill Hill, London, UK.
| |
Collapse
|
34
|
Dittami SM, Proux C, Rousvoal S, Peters AF, Cock JM, Coppée JY, Boyen C, Tonon T. Microarray estimation of genomic inter-strain variability in the genus Ectocarpus (Phaeophyceae). BMC Mol Biol 2011; 12:2. [PMID: 21226968 PMCID: PMC3027116 DOI: 10.1186/1471-2199-12-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Accepted: 01/13/2011] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Brown algae of the genus Ectocarpus exhibit high levels of genetic diversity and variability in morphological and physiological characteristics. With the establishment of E. siliculosus as a model and the availability of a complete genome sequence, it is now of interest to analyze variability among different species, ecotypes, and strains of the genus Ectocarpus both at the genome and the transcriptome level. RESULTS We used an E. siliculosus gene expression microarray based on EST sequences from the genome-sequenced strain (reference strain) to carry out comparative genome hybridizations for five Ectocarpus strains: four E. siliculosus isolates (the male genome strain, a female strain used for outcrosses with the genome strain, a strain isolated from freshwater, and a highly copper-tolerant strain), as well as one strain of the sister species E. fasciculatus. Our results revealed significant genomic differences between ecotypes of the same species, and enable the selection of conserved probes for future microarray experiments with these strains. In the two closely related strains (a male and a female strain used for crosses), genomic differences were also detected, but concentrated in two smaller genomic regions, one of which corresponds to a viral insertion site. CONCLUSION The high variability between strains supports the concept of E. siliculosus as a complex of cryptic species. Moreover, our data suggest that several parts of the Ectocarpus genome may have evolved at different rates: high variability was detected particularly in transposable elements and fucoxanthin chlorophyll a/c binding proteins.
Collapse
Affiliation(s)
- Simon M Dittami
- UPMC Univ Paris 6, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
- Current Address: Department of Biology, University of Oslo, P.O. Box 1066 Blindern, N-0316 Oslo, Norway
| | - Caroline Proux
- Institut Pasteur, Plate-Forme 2- Puces à ADN, 25 rue du docteur Roux, 75724 Paris Cedex 15, France
| | - Sylvie Rousvoal
- UPMC Univ Paris 6, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
| | - Akira F Peters
- BEZHIN ROSKO, 40 rue des pêcheurs, 29250 Santec, France
- MBA Laboratory, Citadel Hill, Plymouth PL1 2PB, UK
| | - J Mark Cock
- UPMC Univ Paris 6, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
| | - Jean-Yves Coppée
- Institut Pasteur, Plate-Forme 2- Puces à ADN, 25 rue du docteur Roux, 75724 Paris Cedex 15, France
| | - Catherine Boyen
- UPMC Univ Paris 6, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
| | - Thierry Tonon
- UPMC Univ Paris 6, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Marine Plants and Biomolecules, Station Biologique, 29680 Roscoff, France
| |
Collapse
|
35
|
Pearson GA, Hoarau G, Lago-Leston A, Coyer JA, Kube M, Reinhardt R, Henckel K, Serrão ETA, Corre E, Olsen JL. An expressed sequence tag analysis of the intertidal brown seaweeds Fucus serratus (L.) and F. vesiculosus (L.) (Heterokontophyta, Phaeophyceae) in response to abiotic stressors. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2010; 12:195-213. [PMID: 19609612 DOI: 10.1007/s10126-009-9208-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Accepted: 05/06/2009] [Indexed: 05/26/2023]
Abstract
In order to aid gene discovery and uncover genes responding to abiotic stressors in stress-tolerant brown algae of the genus Fucus, expressed sequence tags (ESTs) were studied in two species, Fucus serratus and Fucus vesiculosus. Clustering of over 12,000 ESTs from three libraries for heat shock/recovery and desiccation/rehydration resulted in identification of 2,503, 1,290, and 2,409 unigenes from heat-shocked F. serratus, desiccated F. serratus, and desiccated F. vesiculosus, respectively. Low overall annotation rates (18-31%) were strongly associated with the presence of long 3' untranslated regions in Fucus transcripts, as shown by analyses of predicted protein-coding sequence in annotated and nonannotated tentative consensus sequences. Posttranslational modification genes were overrepresented in the heat shock/recovery library, including many chaperones, the most abundant of which were a family of small heat shock protein transcripts, Hsp90 and Hsp70 members. Transcripts of LI818-like light-harvesting genes implicated in photoprotection were also expressed during heat shock in high light. The expression of several heat-shock-responsive genes was confirmed by quantitative reverse transcription polymerase chain reaction. However, candidate genes were notably absent from both desiccation/rehydration libraries, while the responses of the two species to desiccation were divergent, perhaps reflecting the species-specific physiological differences in stress tolerance previously established. Desiccation-tolerant F. vesiculosus overexpressed at least 17 ribosomal protein genes and two ubiquitin-ribosomal protein fusion genes, suggesting that ribosome function and/or biogenesis are important during cycles of rapid desiccation and rehydration in the intertidal zone and possibly indicate parallels with other poikilohydric organisms such as desiccation-tolerant bryophytes.
Collapse
Affiliation(s)
- Gareth A Pearson
- CCMAR, CIMAR-Laboratório Associado, FCMA, Universidade do Algarve, Gambelas, Faro, 8005-139, Portugal.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Le Corguillé G, Pearson G, Valente M, Viegas C, Gschloessl B, Corre E, Bailly X, Peters AF, Jubin C, Vacherie B, Cock JM, Leblanc C. Plastid genomes of two brown algae, Ectocarpus siliculosus and Fucus vesiculosus: further insights on the evolution of red-algal derived plastids. BMC Evol Biol 2009; 9:253. [PMID: 19835607 PMCID: PMC2765969 DOI: 10.1186/1471-2148-9-253] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2009] [Accepted: 10/16/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Heterokont algae, together with cryptophytes, haptophytes and some alveolates, possess red-algal derived plastids. The chromalveolate hypothesis proposes that the red-algal derived plastids of all four groups have a monophyletic origin resulting from a single secondary endosymbiotic event. However, due to incongruence between nuclear and plastid phylogenies, this controversial hypothesis remains under debate. Large-scale genomic analyses have shown to be a powerful tool for phylogenetic reconstruction but insufficient sequence data have been available for red-algal derived plastid genomes. RESULTS The chloroplast genomes of two brown algae, Ectocarpus siliculosus and Fucus vesiculosus, have been fully sequenced. These species represent two distinct orders of the Phaeophyceae, which is a major group within the heterokont lineage. The sizes of the circular plastid genomes are 139,954 and 124,986 base pairs, respectively, the size difference being due principally to the presence of longer inverted repeat and intergenic regions in E. siliculosus. Gene contents of the two plastids are similar with 139-148 protein-coding genes, 28-31 tRNA genes, and 3 ribosomal RNA genes. The two genomes also exhibit very similar rearrangements compared to other sequenced plastid genomes. The tRNA-Leu gene of E. siliculosus lacks an intron, in contrast to the F. vesiculosus and other heterokont plastid homologues, suggesting its recent loss in the Ectocarpales. Most of the brown algal plastid genes are shared with other red-algal derived plastid genomes, but a few are absent from raphidophyte or diatom plastid genomes. One of these regions is most similar to an apicomplexan nuclear sequence. The phylogenetic relationship between heterokonts, cryptophytes and haptophytes (collectively referred to as chromists) plastids was investigated using several datasets of concatenated proteins from two cyanobacterial genomes and 18 plastid genomes, including most of the available red algal and chromist plastid genomes. CONCLUSION The phylogenetic studies using concatenated plastid proteins still do not resolve the question of the monophyly of all chromist plastids. However, these results support both the monophyly of heterokont plastids and that of cryptophyte and haptophyte plastids, in agreement with nuclear phylogenies.
Collapse
Affiliation(s)
- Gildas Le Corguillé
- CNRS, FR2424, Computer and Genomics Resource Centre, Station Biologique, Roscoff, France
- UPMC Univ. Paris 06, FR2424, Computer and Genomics Resource Centre, Station Biologique, Roscoff, France
| | - Gareth Pearson
- Centre of Marine Sciences, University of Algarve, Marine Ecology and Evolution, Faro, Portugal
| | - Marta Valente
- Centre of Marine Sciences, University of Algarve, Marine Ecology and Evolution, Faro, Portugal
| | - Carla Viegas
- Centre of Marine Sciences, University of Algarve, Marine Ecology and Evolution, Faro, Portugal
| | - Bernhard Gschloessl
- CNRS, UMR7139, Marine Plants and Biomolecules, Station Biologique, Roscoff, France
- UPMC Univ. Paris 06, UMR7139, Marine Plants and Biomolecules, Station Biologique, Roscoff, France
| | - Erwan Corre
- CNRS, FR2424, Computer and Genomics Resource Centre, Station Biologique, Roscoff, France
- UPMC Univ. Paris 06, FR2424, Computer and Genomics Resource Centre, Station Biologique, Roscoff, France
| | - Xavier Bailly
- CNRS, FR2424, Computer and Genomics Resource Centre, Station Biologique, Roscoff, France
- UPMC Univ. Paris 06, FR2424, Computer and Genomics Resource Centre, Station Biologique, Roscoff, France
| | - Akira F Peters
- CNRS, UMR7139, Marine Plants and Biomolecules, Station Biologique, Roscoff, France
- UPMC Univ. Paris 06, UMR7139, Marine Plants and Biomolecules, Station Biologique, Roscoff, France
| | - Claire Jubin
- CEA, DSV, Institut de Génomique, Genoscope, Evry, France
- CNRS, UMR 8030, Evry, France
- Université d'Evry, Evry, France
| | | | - J Mark Cock
- CNRS, UMR7139, Marine Plants and Biomolecules, Station Biologique, Roscoff, France
- UPMC Univ. Paris 06, UMR7139, Marine Plants and Biomolecules, Station Biologique, Roscoff, France
| | - Catherine Leblanc
- CNRS, UMR7139, Marine Plants and Biomolecules, Station Biologique, Roscoff, France
- UPMC Univ. Paris 06, UMR7139, Marine Plants and Biomolecules, Station Biologique, Roscoff, France
| |
Collapse
|
37
|
Dittami SM, Scornet D, Petit JL, Ségurens B, Da Silva C, Corre E, Dondrup M, Glatting KH, König R, Sterck L, Rouzé P, Van de Peer Y, Cock JM, Boyen C, Tonon T. Global expression analysis of the brown alga Ectocarpus siliculosus (Phaeophyceae) reveals large-scale reprogramming of the transcriptome in response to abiotic stress. Genome Biol 2009; 10:R66. [PMID: 19531237 PMCID: PMC2718500 DOI: 10.1186/gb-2009-10-6-r66] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2008] [Revised: 02/04/2009] [Accepted: 06/16/2009] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Brown algae (Phaeophyceae) are phylogenetically distant from red and green algae and an important component of the coastal ecosystem. They have developed unique mechanisms that allow them to inhabit the intertidal zone, an environment with high levels of abiotic stress. Ectocarpus siliculosus is being established as a genetic and genomic model for the brown algal lineage, but little is known about its response to abiotic stress. RESULTS Here we examine the transcriptomic changes that occur during the short-term acclimation of E. siliculosus to three different abiotic stress conditions (hyposaline, hypersaline and oxidative stress). Our results show that almost 70% of the expressed genes are regulated in response to at least one of these stressors. Although there are several common elements with terrestrial plants, such as repression of growth-related genes, switching from primary production to protein and nutrient recycling processes, and induction of genes involved in vesicular trafficking, many of the stress-regulated genes are either not known to respond to stress in other organisms or are have been found exclusively in E. siliculosus. CONCLUSIONS This first large-scale transcriptomic study of a brown alga demonstrates that, unlike terrestrial plants, E. siliculosus undergoes extensive reprogramming of its transcriptome during the acclimation to mild abiotic stress. We identify several new genes and pathways with a putative function in the stress response and thus pave the way for more detailed investigations of the mechanisms underlying the stress tolerance of brown algae.
Collapse
Affiliation(s)
- Simon M Dittami
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
| | - Delphine Scornet
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
| | - Jean-Louis Petit
- CEA, DSV, Institut de Génomique, Génoscope, rue Gaston Crémieux, CP5706, 91057 Evry, France
- CNRS, UMR 8030 Génomique métabolique des genomes, rue Gaston Crémieux, CP5706, 91057 Evry, France
- Université d'Evry, UMR 8030 Génomique métabolique des genomes, 91057 Evry, France
| | - Béatrice Ségurens
- CEA, DSV, Institut de Génomique, Génoscope, rue Gaston Crémieux, CP5706, 91057 Evry, France
- CNRS, UMR 8030 Génomique métabolique des genomes, rue Gaston Crémieux, CP5706, 91057 Evry, France
- Université d'Evry, UMR 8030 Génomique métabolique des genomes, 91057 Evry, France
| | - Corinne Da Silva
- CEA, DSV, Institut de Génomique, Génoscope, rue Gaston Crémieux, CP5706, 91057 Evry, France
- CNRS, UMR 8030 Génomique métabolique des genomes, rue Gaston Crémieux, CP5706, 91057 Evry, France
- Université d'Evry, UMR 8030 Génomique métabolique des genomes, 91057 Evry, France
| | - Erwan Corre
- SIG-FR 2424 CNRS UPMC, Station Biologique, 29680 Roscoff, France
| | - Michael Dondrup
- Center for Biotechnology (CeBiTec), University of Bielefeld, 33594 Bielefeld, Germany
| | - Karl-Heinz Glatting
- German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120 Heidelberg, Germany
| | - Rainer König
- German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120 Heidelberg, Germany
| | - Lieven Sterck
- VIB Department of Plant Systems Biology, Ghent University, 9052 Ghent, Belgium
| | - Pierre Rouzé
- VIB Department of Plant Systems Biology, Ghent University, 9052 Ghent, Belgium
| | - Yves Van de Peer
- VIB Department of Plant Systems Biology, Ghent University, 9052 Ghent, Belgium
| | - J Mark Cock
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
| | - Catherine Boyen
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
| | - Thierry Tonon
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, 29680 Roscoff, France
| |
Collapse
|
38
|
Rapid and Effective Method of RNA Isolation from Green Microalga Ankistrodesmus convolutus. Mol Biotechnol 2009; 43:148-53. [DOI: 10.1007/s12033-009-9182-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2009] [Accepted: 05/04/2009] [Indexed: 11/25/2022]
|
39
|
Cosse A, Potin P, Leblanc C. Patterns of gene expression induced by oligoguluronates reveal conserved and environment-specific molecular defense responses in the brown alga Laminaria digitata. THE NEW PHYTOLOGIST 2009; 182:239-250. [PMID: 19192194 DOI: 10.1111/j.1469-8137.2008.02745.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
* Until now, no information has been available on the transcriptional response to the transduction of defense signals in brown seaweeds that leads to active resistance against pathogens or grazers. * Using a polymerase chain reaction (PCR)-based, subtractive cDNA approach combined with filter arrays we demonstrated that Laminaria digitata exhibits a rapid response to oligoguluronate elicitors. The transcription levels of several genes were validated by quantitative real-time reverse-transcription PCR and further analysed using pharmacological approaches. * Fifty upregulated genes were identified by differential screening in elicited algae over a 24-h time-course. These genes were related to oxidative stress responses, production of antimicrobial secondary compounds or cell wall strengthening. Moreover, pharmacological tests showed that intracellular signal transduction is likely to involve reactive oxygen species. A new oligoguluronate-inducible vanadium-dependent haloperoxidase (vHPO), specific to iodide was also characterized. The transcription of several vHPO genes was shown to be tightly regulated. * Taken together, our data show that early transcriptional defense responses in L. digitata are similar to those in land plants but also include novel defense responses that involve tightly regulated iodine metabolism.
Collapse
Affiliation(s)
- Audrey Cosse
- Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie et Curie (UPMC)-Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, BP 74, F-29682, Roscoff, France
| | - Philippe Potin
- Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie et Curie (UPMC)-Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, BP 74, F-29682, Roscoff, France
| | - Catherine Leblanc
- Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie et Curie (UPMC)-Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, BP 74, F-29682, Roscoff, France
| |
Collapse
|
40
|
Tonon T, Rousvoal S, Roeder V, Boyen C. EXPRESSION PROFILING OF THE MANNURONAN C5-EPIMERASE MULTIGENIC FAMILY IN THE BROWN ALGA LAMINARIA DIGITATA (PHAEOPHYCEAE) UNDER BIOTIC STRESS CONDITIONS(1). JOURNAL OF PHYCOLOGY 2008; 44:1250-6. [PMID: 27041721 DOI: 10.1111/j.1529-8817.2008.00580.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The aim of this study was to profile expression of mannuronan C5-epimerase (ManC5-E) genes of Laminaria digitata (Huds.) J. V. Lamour. under treatment with brown alga cell wall components known to induce defense reaction in this organism. After determining that incubation in the presence of homo-guluronates increased the accumulation of ManC5-E transcripts, we cloned a number of partial ManC5-E genes from nonelicited and elicited specimens. In addition to these fragments, previously identified genes from sporophyte and protoplast cDNA libraries were considered for a clustering analysis. Several groups of ManC5-E genes were observed, including groups containing sequences specific from nonelicited and elicited sporophytes, and sequences isolated from protoplasts. Quantitative real-time PCR experiments were then carried out using genes representative of different groups. Results of transcript accumulation during protoplast regeneration and sporophyte elicitation supported the hypothesis that specific C5-epimerase genes are recruited under pathogen attack, enabling L. digitata to modify its cell wall in response to environmental stimuli.
Collapse
Affiliation(s)
- Thierry Tonon
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F-29682, Roscoff, France CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F-29682, Roscoff, France
| | - Sylvie Rousvoal
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F-29682, Roscoff, France CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F-29682, Roscoff, France
| | - Vincent Roeder
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F-29682, Roscoff, France CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F-29682, Roscoff, France
| | - Catherine Boyen
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F-29682, Roscoff, France CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F-29682, Roscoff, France
| |
Collapse
|
41
|
Ritter A, Goulitquer S, Salaün JP, Tonon T, Correa JA, Potin P. Copper stress induces biosynthesis of octadecanoid and eicosanoid oxygenated derivatives in the brown algal kelp Laminaria digitata. THE NEW PHYTOLOGIST 2008; 180:809-21. [PMID: 18823315 DOI: 10.1111/j.1469-8137.2008.02626.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
To better understand the toxicity and the orchestration of antioxidant defenses of marine brown algae in response to copper-induced stress, lipid peroxidation processes were investigated in the brown alga Laminaria digitata. The expression of genes involved in cell protection and anti-oxidant responses were monitored by semi-quantitative reverse transcriptase polymerase chain reaction and the lipid peroxidation products were further characterized by profiling oxylipin signatures using high-pressure liquid chromatography-mass spectrometry. Exposure to copper excess triggers lipoperoxide accumulation and upregulates the expression of stress related genes. It also increases the release of free polyunsaturated fatty acids, leading to an oxidative cascade through at least two distinct mechanisms. Incubations in presence of inhibitors of lipoxygenases and cycloxygenases showed that in addition to the reactive oxygen species-mediated processes, copper stress induces the synthesis of oxylipins through enzymatic mechanisms. Among complex oxylipins, cyclopentenones from C18 and C20 fatty acids such as 12-oxo-PDA and prostaglandins were detected for the first time in brown algae, as well as unique compounds such as the 18-hydroxy-17-oxo-eicosatetraenoic acid. These results suggest that lipid peroxidation participates in the toxic effects of copper and that lipid peroxidation derivatives may regulate protective mechanisms by employing plant-like octadecanoid signals but also eicosanoid oxylipins which are absent in vascular plants.
Collapse
Affiliation(s)
- Andrés Ritter
- Université Pierre et Marie Curie-Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F-29682, Roscoff, France
| | | | | | | | | | | |
Collapse
|
42
|
Le Bail A, Dittami SM, de Franco PO, Rousvoal S, Cock MJ, Tonon T, Charrier B. Normalisation genes for expression analyses in the brown alga model Ectocarpus siliculosus. BMC Mol Biol 2008; 9:75. [PMID: 18710525 PMCID: PMC2546422 DOI: 10.1186/1471-2199-9-75] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2008] [Accepted: 08/18/2008] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Brown algae are plant multi-cellular organisms occupying most of the world coasts and are essential actors in the constitution of ecological niches at the shoreline. Ectocarpus siliculosus is an emerging model for brown algal research. Its genome has been sequenced, and several tools are being developed to perform analyses at different levels of cell organization, including transcriptomic expression analyses. Several topics, including physiological responses to osmotic stress and to exposure to contaminants and solvents are being studied in order to better understand the adaptive capacity of brown algae to pollution and environmental changes. A series of genes that can be used to normalise expression analyses is required for these studies. RESULTS We monitored the expression of 13 genes under 21 different culture conditions. These included genes encoding proteins and factors involved in protein translation (ribosomal protein 26S, EF1alpha, IF2A, IF4E) and protein degradation (ubiquitin, ubiquitin conjugating enzyme) or folding (cyclophilin), and proteins involved in both the structure of the cytoskeleton (tubulin alpha, actin, actin-related proteins) and its trafficking function (dynein), as well as a protein implicated in carbon metabolism (glucose 6-phosphate dehydrogenase). The stability of their expression level was assessed using the Ct range, and by applying both the geNorm and the Normfinder principles of calculation. CONCLUSION Comparisons of the data obtained with the three methods of calculation indicated that EF1alpha (EF1a) was the best reference gene for normalisation. The normalisation factor should be calculated with at least two genes, alpha tubulin, ubiquitin-conjugating enzyme or actin-related proteins being good partners of EF1a. Our results exclude actin as a good normalisation gene, and, in this, are in agreement with previous studies in other organisms.
Collapse
Affiliation(s)
- Aude Le Bail
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
| | - Simon M Dittami
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
| | - Pierre-Olivier de Franco
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
| | - Sylvie Rousvoal
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
| | - Mark J Cock
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
| | - Thierry Tonon
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
| | - Bénédicte Charrier
- UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France
| |
Collapse
|
43
|
Peters AF, Scornet D, Ratin M, Charrier B, Monnier A, Merrien Y, Corre E, Coelho SM, Cock JM. Life-cycle-generation-specific developmental processes are modified in the immediate upright mutant of the brown alga Ectocarpus siliculosus. Development 2008; 135:1503-12. [PMID: 18339673 DOI: 10.1242/dev.016303] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Development of the sporophyte and gametophyte generations of the brown alga E. siliculosus involves two different patterns of early development, which begin with either a symmetric or an asymmetric division of the initial cell, respectively. A mutant, immediate upright (imm), was isolated that exhibited several characteristics typical of the gametophyte during the early development of the sporophyte generation. Genetic analyses showed that imm is a recessive, single-locus Mendelian factor and analysis of gene expression in this mutant indicated that the regulation of a number of life-cycle-regulated genes is specifically modified in imm mutant sporophytes. Thus, IMM appears to be a regulatory locus that controls part of the sporophyte-specific developmental programme, the mutant exhibiting partial homeotic conversion of the sporophyte into the gametophyte, a phenomenon that has not been described previously.
Collapse
Affiliation(s)
- Akira F Peters
- UPMC Université Paris 06, The Marine Plants and Biomolecules Laboratory, UMR 7139, Station Biologique de Roscoff, Place Georges Teissier, BP74, 29682 Roscoff Cedex, France
| | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Wong TKM, Ho CL, Lee WW, Rahim RA, Phang SM. ANALYSES OF EXPRESSED SEQUENCE TAGS FROM SARGASSUM BINDERI(PHAEOPHYTA). JOURNAL OF PHYCOLOGY 2007; 43:528-534. [DOI: 10.1111/j.1529-8817.2007.00349.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
|
45
|
Brakemann T, Schlörmann W, Marquardt J, Nolte M, Rhiel E. Association of Fucoxanthin Chlorophyll a/c-binding Polypeptides with Photosystems and Phosphorylation in the Centric Diatom Cyclotella cryptica. Protist 2006; 157:463-75. [PMID: 16904939 DOI: 10.1016/j.protis.2006.07.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2006] [Accepted: 07/02/2006] [Indexed: 10/24/2022]
Abstract
Solubilization of thylakoid membranes of Cyclotella cryptica with dodecyl-beta maltoside followed by sucrose density gradient centrifugation or deriphate polyacrylamide gel electrophoresis resulted in the isolation of pigment protein complexes. These complexes were characterized by absorption and fluorescence spectroscopy, sodium dodecyl sulfate polyacrylamide gel electrophoresis and Western immunoblotting using antisera against fucoxanthin chlorophyll a/c-binding proteins and the reaction center protein D2 of photosystem II. Sucrose density gradient centrifugation yielded four bands. Band 1 consisted of free pigments with minor amounts of fucoxanthin chlorophyll a/c-binding proteins. Bands 2, 3, and 4 represented a major fucoxanthin chlorophyll a/c-binding protein fraction, photosystem II, and photosystem I, respectively. Deriphate polyacrylamide gel electrophoresis gave rise to five bands, representing photosystem I, photosystem II, two fucoxanthin chlorophyll a/c-binding protein complexes, and a band mostly consisting of free pigments. In the Western immunoblotting experiments, the specific association of two fucoxanthin chlorophyll a/c-binding proteins, Fcp2 and Fcp4, to the photosystems could be demonstrated. In vivo experiments using antibodies against phosphothreonine residues and in vitro studies using [gamma-32P]ATP showed that fucoxanthin chlorophyll a/c binding-proteins of 22 kDa became phosphorylated.
Collapse
Affiliation(s)
- Tanja Brakemann
- Geomikrobiologie, ICBM, Carl-von-Ossietzky-Universität Oldenburg, POB. 2503, 26129 Oldenburg, Germany
| | | | | | | | | |
Collapse
|
46
|
Collén J, Hervé C, Guisle-Marsollier I, Léger JJ, Boyen C. Expression profiling of Chondrus crispus (Rhodophyta) after exposure to methyl jasmonate. JOURNAL OF EXPERIMENTAL BOTANY 2006; 57:3869-81. [PMID: 17043086 DOI: 10.1093/jxb/erl171] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Methyl jasmonate (MeJA) is a plant hormone important for the mediation of signals for developmental processes and defence reactions in higher plants. The effects of MeJA and the signalling pathways on other photosynthetic organism groups are largely unknown, even though MeJA may have very important roles. Therefore the effects of MeJA in a red alga were studied. A medium-scale expression profiling approach to identify genes regulated by MeJA in the red seaweed Chondrus crispus is described here. The expression profiles were studied 0, 2, 4, 6, 12, and 24 h after the addition of MeJA to the seawater surrounding the algae. The changes in the transcriptome were monitored using cDNA microarrays with 1920 different cDNA representing 1295 unique genes. The responses of selected genes were verified with real-time PCR and the correlation between the two methods was generally satisfying. The study showed that 6% of genes studied showed a response to the addition of MeJA and the most dynamic response was seen after 6 h. Genes that showed up-regulation included several glutathione S-transferases, heat shock protein 20, a xenobiotic reductase, and phycocyanin lyase. Down-regulated transcripts included glucose kinase, phosphoglucose isomerase, and a ribosomal protein. A comparison between different functional groups showed an up-regulation of stress-related genes and a down-regulation of genes involved in energy conversion and general metabolism. It is concluded that MeJA, or a related compound, has a physiological role as a stress hormone in red algae. This study represents to our knowledge the first analysis of gene expression using cDNA microarrays in a red macroalga.
Collapse
Affiliation(s)
- Jonas Collén
- Centre National de la Recherche Scientifique, Université Pierre et Marie Curie-Paris 6, Laboratoire International Associé-Dispersal and Adaptation in Marine Species, Unité Mixte de Recherche 7139, France.
| | | | | | | | | |
Collapse
|
47
|
Colin C, Leblanc C, Michel G, Wagner E, Leize-Wagner E, Van Dorsselaer A, Potin P. Vanadium-dependent iodoperoxidases in Laminaria digitata, a novel biochemical function diverging from brown algal bromoperoxidases. J Biol Inorg Chem 2005; 10:156-66. [PMID: 15747134 DOI: 10.1007/s00775-005-0626-8] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2004] [Accepted: 01/13/2005] [Indexed: 11/26/2022]
Abstract
The brown alga Laminaria digitata features a distinct vanadium-dependent iodoperoxidase (vIPO) activity, which has been purified to electrophoretic homogeneity. Steady-state analyses at pH 6.2 are reported for vIPO (K (m) (I-) = 2.5 mM; k (cat) (I-) = 462 s(-1)) and for the previously characterised vanadium-dependent bromoperoxidase in L. digitata (K (m) (I-) =18.1 mM; k (cat) (I-) = 38 s(-1)). Although the vIPO enzyme specifically oxidises iodide, competition experiments with halides indicate that bromide is a competitive inhibitor with respect to the fixation of iodide. A full-length complementary ANA (cDNA) was cloned and shown to be actively transcribed in L. digitata and to encode the vIPO enzyme. Mass spectrometry analyses of tryptic digests of vIPO indicated the presence of at least two very similar proteins, in agreement with Southern analyses showing that vIPOs are encoded by a multigenic family in L. digitata. Phylogenetic analyses indicated that vIPO shares a close common ancestor with brown algal vanadium-dependent bromoperoxidases. Based on a three-dimensional structure model of the vIPO active site and on comparisons with those of other vanadium-dependent haloperoxidases, we propose a hypothesis to explain the evolution of strict specificity for iodide in L. digitata vIPO.
Collapse
Affiliation(s)
- Carole Colin
- Station Biologique, UMR 7139 CNRS, Goëmar-Université Pierre & Marie Curie, Roscoff Cedex, France.
| | | | | | | | | | | | | |
Collapse
|
48
|
Fujita Y, Ohki K. On the 710 nm Fluorescence Emitted by the Diatom Phaeodactylum tricornutum at Room Temperature. ACTA ACUST UNITED AC 2004; 45:392-7. [PMID: 15111713 DOI: 10.1093/pcp/pch043] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The fluorescence emitted at 710 nm by Phaeodactylum tricornutum (F(710)) was characterized. Development of F(710) was found to be regulated by the quality of light needed for algal growth: weak red light absorbed mainly by Chl a induced its development, and weak blue-green light absorbed mainly by fucoxanthin and Chl c suppressed it. The difference spectra between cells grown under the two light conditions revealed two Chl a forms, absorption peaks of which were located at 692 nm (Chl a(692)) and at 703 nm (Chl a(703)), respectively, in red-light-grown cells. During cell growth under red light, the appearance and intensification of the emission correlated well with development of Chl a(692) and Chl a(703) suggesting that the two forms of Chl a are involved in the energy flow to F(710). A clear induction phenomenon characteristic of the PSII fluorescence was observed not only with the emission at 680 nm but also with F(710), indicating that F(710) is emitted by PSII Chl a. Development of F(710) under red light was sensitive to cycloheximide, indicating that the development of the energy flow to F(710) requires protein synthesis and that the emitter is installed in a protein encoded in the nuclear genome like the light-harvesting complex (LHC). Centrifugal fractionation of pigment-protein complexes revealed F(710) to be located at fractions slightly heavier than the major LHC. Development of F(710) was also found in red-light-grown cells of the diatom Nitzschia closterium.
Collapse
Affiliation(s)
- Yoshihiko Fujita
- Department of Marine Bioscience, Fukui Prefectural University, Obama, Fukui, 917 Japan.
| | | |
Collapse
|
49
|
Nyvall P, Corre E, Boisset C, Barbeyron T, Rousvoal S, Scornet D, Kloareg B, Boyen C. Characterization of mannuronan C-5-epimerase genes from the brown alga Laminaria digitata. PLANT PHYSIOLOGY 2003; 133:726-35. [PMID: 14526115 PMCID: PMC219047 DOI: 10.1104/pp.103.025981] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2003] [Revised: 06/09/2003] [Accepted: 07/11/2003] [Indexed: 05/07/2023]
Abstract
Alginate is an industrially important polysaccharide obtained commercially by harvesting brown algae. The final step in alginate biosynthesis, the epimerization of beta-1,4-d-mannuronic acid to alpha-1,4-l-guluronic acid, a structural change that controls the physicochemical properties of the alginate, is catalyzed by the enzyme mannuronan C-5-epimerase. Six different cDNAs with homology to bacterial mannuronan C-5-epimerases were isolated from the brown alga Laminaria digitata (Phaeophyceae). Hydrophobic cluster analysis indicated that the proteins encoded by the L. digitata sequences have important structural similarities to the bacterial mannuronan C-5-epimerases, including conservation of the catalytic site. The expression of the C-5-epimerase genes was examined by northern-blot analysis and reverse transcriptase-polymerase chain reaction in L. digitata throughout a year. Expression was also monitored in protoplast cultures by northern and western blot, reverse transcriptase-polymerase chain reaction, and activity measurements. From both the structural comparisons and the expression pattern, it appears that the cDNAs isolated from L. digitata encode functional mannuronan C-5-epimerases. The phylogenetic relationships of the bacterial and brown algal enzymes and the inferences on the origin of alginate biosynthetic machinery are discussed.
Collapse
Affiliation(s)
- Pi Nyvall
- Unité Mixte de Recherche 1931, Centre National de la Recherche Scientifique and Laboratoires Goëmar, Station Biologique de Roscoff, BP 74, 29682 Roscoff cedex, Brittany, France
| | | | | | | | | | | | | | | |
Collapse
|
50
|
Colin C, Leblanc C, Wagner E, Delage L, Leize-Wagner E, Van Dorsselaer A, Kloareg B, Potin P. The brown algal kelp Laminaria digitata features distinct bromoperoxidase and iodoperoxidase activities. J Biol Chem 2003; 278:23545-52. [PMID: 12697758 DOI: 10.1074/jbc.m300247200] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Different haloperoxidases, one specific for the oxidation of iodide and another that can oxidize both iodide and bromide, were separated from the sporophytes of the brown alga Laminaria digitata and purified to electrophoretic homogeneity. The iodoperoxidase activity was approximately seven times more efficient than the bromoperoxidase fraction in the oxidation of iodide. The two enzymes were markedly different in their molecular masses, trypsin digestion profiles, and immunological characteristics. Also, in contrast to the iodoperoxidase, bromoperoxidases were present in the form of multimeric aggregates of near-identical proteins. Two full-length haloperoxidase cDNAs were isolated from L. digitata, using haloperoxidase partial cDNAs that had been identified previously in an Expressed Sequence Tag analysis of the life cycle of this species (1). Sequence comparisons, mass spectrometry, and immunological analyses of the purified bromoperoxidase, as well as the activity of the protein expressed in Escherichia coli, all indicate that these almost identical cDNAs encode bromoperoxidases. Haloperoxidases form a large multigenic family in L. digitata, and the potential functions of haloperoxidases in this kelp are discussed.
Collapse
Affiliation(s)
- Carole Colin
- UMR 1931, CNRS-Laboratoires Goëmar, Station Biologique, BP 74, F-29682 Roscoff Cedex, France
| | | | | | | | | | | | | | | |
Collapse
|