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dinoflagellate

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https://www.readbyqxmd.com/read/29339342/transgenerational-impairments-of-reproduction-and-development-of-the-marine-invertebrate-crepidula-onyx-resulted-from-long-term-dietary-exposure-of-2-2-4-4-tetrabromodiphenyl-ether-bde-47
#1
Beverly H K Po, Jill M Y Chiu
Polybrominated diphenyl ethers have become ubiquitous in the environment and elevated concentrations have often been found in marine organisms. Using the gastropod Crepidula onyx as a study model, this multigenerational study sets out to test the hypotheses that 1) parental dietary exposure to environmentally realistic levels of 2,2',4,4'-tetrabrominated diphenyl ether (BDE-47) would lead to transgenerational impairments on fitness traits of marine invertebrates, and 2) the organisms might develop adaptation/acclimation after exposure for one or more generations...
January 12, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29338050/correction-utilization-of-urea-and-expression-profiles-of-related-genes-in-the-dinoflagellate-prorocentrum-donghaiense
#2
Xiaoli Jing, Senjie Lin, Huan Zhang, Claudia Koerting, Zhigang Yu
[This corrects the article DOI: 10.1371/journal.pone.0187837.].
2018: PloS One
https://www.readbyqxmd.com/read/29331827/pilot-scale-outdoor-photobioreactor-culture-of-the-marine-dinoflagellate-karlodinium-veneficum-production-of-a-karlotoxins-rich-extract
#3
L López-Rosales, A Sánchez-Mirón, F García-Camacho, A R Place, Yusuf Chisti, E Molina-Grima
A pilot-scale bioprocess was developed for the production of karlotoxin-enriched extracts of the marine algal dinoflagellate Karlodinium veneficum. A bubble column and a flat-panel photobioreactors (80-281 L) were used for comparative assessment of growth. Flow hydrodynamics and energy dissipation rates (EDR) in the bioreactors were characterized through robust computational fluid dynamic simulations. All cultures were conducted monoseptically outdoors. Bubble column (maximum cell productivity in semicontinuous operation of 58 × 103 cell mL-1 day-1) proved to be a better culture system for this alga...
December 30, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29330535/the-stoichiometry-of-coral-dinoflagellate-symbiosis-carbon-and-nitrogen-cycles-are-balanced-in-the-recycling-and-double-translocation-system
#4
Yasuaki Tanaka, Atsushi Suzuki, Kazuhiko Sakai
Symbioses between microalgae and animal hosts have the advantage of acquiring and sharing autotrophically produced organic carbon (C) as their energy source. However, the stoichiometry and turnover rates of biological elements in symbioses are not fully understood because of complicated metabolic interactions. We report the first comprehensive and simultaneous measurement of C and nitrogen (N) flows through coral-dinoflagellate symbiosis by using the unique approach of dual-isotope labeling with 13C and 15N, in situ chasing, and isotope-mixing models...
January 12, 2018: ISME Journal
https://www.readbyqxmd.com/read/29321691/deciphering-the-nature-of-the-coral-chromera-association
#5
Amin R Mohamed, Vivian R Cumbo, Saki Harii, Chuya Shinzato, Cheong Xin Chan, Mark A Ragan, Nori Satoh, Eldon E Ball, David J Miller
Since the discovery of Chromera velia as a novel coral-associated microalga, this organism has attracted interest because of its unique evolutionary position between the photosynthetic dinoflagellates and the parasitic apicomplexans. The nature of the relationship between Chromera and its coral host is controversial. Is it a mutualism, from which both participants benefit, a parasitic relationship, or a chance association? To better understand the interaction, larvae of the common Indo-Pacific reef-building coral Acropora digitifera were experimentally infected with Chromera, and the impact on the host transcriptome was assessed at 4, 12, and 48 h post-infection using Illumina RNA-Seq technology...
January 10, 2018: ISME Journal
https://www.readbyqxmd.com/read/29316019/cell-cycle-dynamics-of-cultured-coral-endosymbiotic-microalgae-symbiodinium-across-different-types-species-under-alternate-light-and-temperature-conditions
#6
Lisa Fujise, Matthew R Nitschke, Jörg C Frommlet, João Serôdio, Stephen Woodcock, Peter J Ralph, David J Suggett
Dinoflagellates of the genus Symbiodinium live in symbiosis with many invertebrates, including reef-building corals. Hosts maintain this symbiosis through continuous regulation of Symbiodinium cell density via expulsion and degradation (post-mitotic) and/or constraining cell growth and division through manipulation of the symbiont cell cycle (pre-mitotic). Importance of pre-mitotic regulation is unknown since little data exists on cell cycles for the immense genetic diversity of Symbiodinium. We therefore examined cell cycle progression for several distinct Symbiodinium ITS2-types (B1, C1, D1a)...
January 8, 2018: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/29306662/ciguatoxins-activate-the-calcineurin-signalling-pathway-in-yeasts-potential-for-development-of-an-alternative-detection-tool
#7
Hélène Martin-Yken, Camille Gironde, Sylvain Derick, Hélène Taiana Darius, Christophe Furger, Dominique Laurent, Mireille Chinain
Ciguatoxins (CTXs) are lipid-soluble polyether compounds produced by dinoflagellates from the genus Gambierdiscus spp. typically found in tropical and subtropical zones. This endemic area is however rapidly expanding due to environmental perturbations, and both toxic Gambierdiscus spp. and ciguatoxic fishes have been recently identified in the North Atlantic Ocean (Madeira and Canary islands) and Mediterranean Sea. Ciguatoxins bind to Voltage Gated Sodium Channels on the membranes of sensory neurons, causing Ciguatera Fish Poisoning (CFP) in humans, a disease characterized by a complex array of gastrointestinal, neurological, neuropsychological, and cardiovascular symptoms...
January 4, 2018: Environmental Research
https://www.readbyqxmd.com/read/29306398/intraspecific-bloom-succession-in-the-harmful-dinoflagellate-cochlodinium-polykrikoides-dinophyceae-extended-the-blooming-period-in-korean-coastal-waters-in-2009
#8
Bum Soo Park, Jin Ho Kim, Joo-Hwan Kim, Seung Ho Baek, Myung-Soo Han
Although there have been extensive studies on dinoflagellate blooms in recent decades, the mechanism that allows the maintenance of blooms over long periods remains uncertain, and studies on genetically differentiated subpopulations may provide insights into this mechanism. In this study, the influence of two genetically distinct subpopulations of the dinoflagellate Cochlodinium polykrikoides, referred to as Group I and IV, on bloom duration in Korean coastal waters (KCW) was examined using a quantitative PCR (qPCR) assay...
January 2018: Harmful Algae
https://www.readbyqxmd.com/read/29306397/pentaplacodinium-saltonense-gen-et-sp-nov-dinophyceae-and-its-relationship-to-the-cyst-defined-genus-operculodinium-and-yessotoxin-producing-protoceratium-reticulatum
#9
Kenneth Neil Mertens, M Consuelo Carbonell-Moore, Vera Pospelova, Martin J Head, Andrea Highfield, Declan Schroeder, Haifeng Gu, Karl B Andree, Margarita Fernandez, Aika Yamaguchi, Yoshihito Takano, Kazumi Matsuoka, Elisabeth Nézan, Gwenael Bilien, Yuri Okolodkov, Kazuhiko Koike, Mona Hoppenrath, Maya Pfaff, Grant Pitcher, Abdulrahman Al-Muftah, André Rochon, Po Teen Lim, Chui Pin Leaw, Zhen Fei Lim, Marianne Ellegaard
Strains of a dinoflagellate from the Salton Sea, previously identified as Protoceratium reticulatum and yessotoxin producing, have been reexamined morphologically and genetically and Pentaplacodinium saltonense n. gen. et sp. is erected to accommodate this species. Pentaplacodinium saltonense differs from Protoceratium reticulatum (Claparède et Lachmann 1859) Bütschli 1885 in the number of precingular plates (five vs. six), cingular displacement (two widths vs. one), and distinct cyst morphology. Incubation experiments (excystment and encystment) show that the resting cyst of Pentaplacodinium saltonense is morphologically most similar to the cyst-defined species Operculodinium israelianum (Rossignol, 1962) Wall (1967) and O...
January 2018: Harmful Algae
https://www.readbyqxmd.com/read/29306396/variable-allelopathy-among-phytoplankton-reflected-in-red-tide-metabolome
#10
Remington X Poulin, Kelsey L Poulson-Ellestad, Jessie S Roy, Julia Kubanek
Harmful algae are known to utilize allelopathy, the release of compounds that inhibit competitors, as a form of interference competition. Competitor responses to allelopathy are species-specific and allelopathic potency of producing algae is variable. In the current study, the biological variability in allelopathic potency was mapped to the underlying chemical variation in the exuded metabolomes of five genetic strains of the red tide dinoflagellate Karenia brevis using 1H nuclear magnetic resonance (NMR) spectroscopy...
January 2018: Harmful Algae
https://www.readbyqxmd.com/read/29306395/application-of-solid-phase-adsorption-toxin-tracking-spatt-devices-for-the-field-detection-of-gambierdiscus-toxins
#11
Mélanie Roué, Hélène Taiana Darius, Jérôme Viallon, André Ung, Clémence Gatti, D Tim Harwood, Mireille Chinain
Ciguatera fish poisoning is a food-borne illness caused by the consumption of seafood contaminated with ciguatoxins (CTXs) produced by dinoflagellates in the Gambierdiscus genus. Since most surveillance programs currently rely on the survey of Gambierdiscus cell densities and species composition, supplementary toxin-based methods allowing the time- and spatially integrated sampling of toxins in ciguateric environments are needed for a more reliable assessment and management of the risks associated with Gambierdiscus proliferation...
January 2018: Harmful Algae
https://www.readbyqxmd.com/read/29306394/brevetoxin-pbtx-2-influences-the-redox-status-and-npq-of-karenia-brevis-by-way-of-thioredoxin-reductase
#12
Wei Chen, Ricardo Colon, J William Louda, Freddy Rodriguez Del Rey, Michaella Durham, Kathleen S Rein
The Florida red tide dinoflagellate, Karenia brevis, is the major harmful algal bloom dinoflagellate of the Gulf of Mexico and plays a destructive role in the region. Blooms of K. brevis can produce brevetoxins: ladder-shaped polyether (LSP) compounds, which can lead to adverse human health effects, such as reduced respiratory function through inhalation exposure, or neurotoxic shellfish poisoning through consumption of contaminated shellfish. The endogenous role of the brevetoxins remains uncertain. Recent work has shown that some forms of NADPH dependent thioredoxin reductase (NTR) are inhibited by brevetoxin-2 (PbTx-2)...
January 2018: Harmful Algae
https://www.readbyqxmd.com/read/29302268/time-capsules-in-natural-sediment-archives-tracking-phytoplankton-population-genetic-diversity-and-adaptation-over-multidecadal-timescales-in-the-face-of-environmental-change
#13
REVIEW
Marianne Ellegaard, Anna Godhe, Sofia Ribeiro
Undisturbed records of resting stages produced in the past and stored in coastal sediments are very valuable to science, because they may provide unique insights into past evolutionary and ecological trajectories. Within marine phytoplankton, multidecadal time series of monoclonal strains germinated from resting stages have been established for diatoms (Skeletonema marinoi) and dinoflagellates (Pentapharsodinium dalei), spanning ca. a century. Phenotypic and genotypic analyses of these time series have revealed effects of past environmental changes on population genetic structure...
January 2018: Evolutionary Applications
https://www.readbyqxmd.com/read/29301247/toxicology-of-gambierdiscus-spp-dinophyceae-from-tropical-and-temperate-australian-waters
#14
Michaela E Larsson, Olivier F Laczka, D Tim Harwood, Richard J Lewis, S W A Himaya, Shauna A Murray, Martina A Doblin
Ciguatera Fish Poisoning (CFP) is a human illness caused by the consumption of marine fish contaminated with ciguatoxins (CTX) and possibly maitotoxins (MTX), produced by species from the benthic dinoflagellate genus Gambierdiscus. Here, we describe the identity and toxicology of Gambierdiscus spp. isolated from the tropical and temperate waters of eastern Australia. Based on newly cultured strains, we found that four Gambierdiscus species were present at the tropical location, including G. carpenteri, G. lapillus and two others which were not genetically identical to other currently described species within the genus, and may represent new species...
January 1, 2018: Marine Drugs
https://www.readbyqxmd.com/read/29286547/explaining-the-origin-of-three-membrane-bound-plastids-in-dinoflagellates-and-euglenophytes-kleptoplastidy-via-myzocytosis
#15
Daniel Moog, Uwe G Maier
No abstract text is available yet for this article.
December 29, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/29274579/6-0%C3%A2-k-microarray-reveals-differential-transcriptomic-responses-in-the-dinoflagellate-prorocentrum-minimum-exposed-to-polychlorinated-biphenyl-pcb
#16
Hui Wang, Ruoyu Guo, Jang-Seu Ki
Endocrine disrupting chemicals (EDCs) have toxic effects on algae; however, their molecular genomic responses have not been sufficiently elucidated. Here, we evaluated genome-scaled responses of the dinoflagellate alga Prorocentrum minimum exposed to an EDC, polychlorinated biphenyl (PCB), using a 6.0 K microarray. Based on two-fold change cut-off, we identified that 609 genes (∼10.2%) responded to the PCB treatment. KEGG pathway analysis showed that differentially expressed genes (DEGs) were related to ribosomes, biosynthesis of amino acids, spliceosomes, and cellular processes...
December 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/29261163/biotechnological-and-pharmacological-applications-of-biotoxins-and-other-bioactive-molecules-from-dinoflagellates
#17
REVIEW
Joana Assunção, A Catarina Guedes, F Xavier Malcata
The long-lasting interest in bioactive molecules (namely toxins) produced by (microalga) dinoflagellates has risen in recent years. Exhibiting wide diversity and complexity, said compounds are well-recognized for their biological features, with great potential for use as pharmaceutical therapies and biological research probes. Unfortunately, provision of those compounds is still far from sufficient, especially in view of an increasing demand for preclinical testing. Despite the difficulties to establish dinoflagellate cultures and obtain reasonable productivities of such compounds, intensive research has permitted a number of advances in the field...
December 20, 2017: Marine Drugs
https://www.readbyqxmd.com/read/29258236/lc-ms-ms-detection-of-karlotoxins-reveals-new-variants-in-strains-of-the-marine-dinoflagellate-karlodinium-veneficum-from-the-ebro-delta-nw-mediterranean
#18
Bernd Krock, Julia A Busch, Urban Tillmann, Francisco García-Camacho, Asterio Sánchez-Mirón, Juan J Gallardo-Rodríguez, Lorenzo López-Rosales, Karl B Andree, Margarita Fernández-Tejedor, Matthias Witt, Allan D Cembella, Allen R Place
A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the detection and quantitation of karlotoxins in the selected reaction monitoring (SRM) mode. This novel method was based upon the analysis of purified karlotoxins (KcTx-1, KmTx-2, 44-oxo-KmTx-2, KmTx-5), one amphidinol (AM-18), and unpurified extracts of bulk cultures of the marine dinoflagellate Karlodinium veneficum strain CCMP2936 from Delaware (Eastern USA), which produces KmTx-1 and KmTx-3. The limit of detection of the SRM method for KmTx-2 was determined as 2...
December 18, 2017: Marine Drugs
https://www.readbyqxmd.com/read/29242500/comparative-analysis-of-the-genomes-of-stylophora-pistillata-and-acropora-digitifera-provides-evidence-for-extensive-differences-between-species-of-corals
#19
Christian R Voolstra, Yong Li, Yi Jin Liew, Sebastian Baumgarten, Didier Zoccola, Jean-François Flot, Sylvie Tambutté, Denis Allemand, Manuel Aranda
Stony corals form the foundation of coral reef ecosystems. Their phylogeny is characterized by a deep evolutionary divergence that separates corals into a robust and complex clade dating back to at least 245 mya. However, the genomic consequences and clade-specific evolution remain unexplored. In this study we have produced the genome of a robust coral, Stylophora pistillata, and compared it to the available genome of a complex coral, Acropora digitifera. We conducted a fine-scale gene-based analysis focusing on ortholog groups...
December 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29235023/dinoflagellate-cyst-abundance-is-positively-correlated-to-sediment-organic-carbon-in-sydney-harbour-and-botany-bay-nsw-australia
#20
Chang Tian, Martina A Doblin, Katherine A Dafforn, Emma L Johnston, Haiyan Pei, Wenrong Hu
There is growing public concern about the global expansion of harmful algal bloom species (HABs), with dinoflagellate microalgae comprising the major portion of the harmful taxa. These motile, unicellular organisms have a lifecycle involving sexual reproduction and resting cyst formation whereby cysts can germinate from sediments and 'seed' planktonic populations. Thus, investigation of dinoflagellate cyst (dinocyst) distribution in sediments can provide significant insights into HAB dynamics and contribute to indices of habitat quality...
December 12, 2017: Environmental Science and Pollution Research International
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