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Wang H, Guo R, Ki JS. 6.0 K microarray reveals differential transcriptomic responses in the dinoflagellate Prorocentrum minimum exposed to polychlorinated biphenyl (PCB). CHEMOSPHERE 2018; 195:398-409. [PMID: 29274579 DOI: 10.1016/j.chemosphere.2017.12.066] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 10/23/2017] [Accepted: 12/11/2017] [Indexed: 06/07/2023]
Abstract
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. Many DEGs were involved in cell cycle progression, apoptosis, signal transduction, ion binding, and cellular transportation. In contrast, only a few genes related to photosynthesis and oxidative stress were expressed in response to PCB exposure. This was supported by that fact that there were no obvious changes in the photosynthetic efficiency and reactive oxygen species (ROS) production. These results suggest that PCB might not cause chloroplast and oxidative damage, but could lead to cell cycle arrest and apoptosis. In addition, various signal transduction and transport pathways might be disrupted in the cells, which could further contribute to cell death. These results expand the genomic understanding of the effects of EDCs on this dinoflagellate protist.
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Affiliation(s)
- Hui Wang
- Department of Biotechnology, Sangmyung University, Seoul 03016, South Korea
| | - Ruoyu Guo
- Department of Biotechnology, Sangmyung University, Seoul 03016, South Korea
| | - Jang-Seu Ki
- Department of Biotechnology, Sangmyung University, Seoul 03016, South Korea.
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Wiese M, Murray SA, Alvin A, Neilan BA. Gene expression and molecular evolution of sxtA4 in a saxitoxin producing dinoflagellate Alexandrium catenella. Toxicon 2014; 92:102-12. [PMID: 25301480 DOI: 10.1016/j.toxicon.2014.09.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 09/25/2014] [Indexed: 10/24/2022]
Abstract
Dinoflagellates of the genus Alexandrium produce the neurotoxin saxitoxin (STX), responsible for paralytic shellfish poisoning (PSP) and accumulates in marine invertebrates. The recent identification of STX biosynthesis genes allowed us to investigate the expression of sxtA4 at different growth stages in Alexandrium catenella Group IV. We found no significant differences in expression of sxtA4, despite significant differences in STX levels at different growth stages (P < 0.023). Three reference genes were tested for normalisation: actin, cytochrome b (cob), and the large subunit ribosomal RNA (LSU rDNA). cob was most stably expressed but the combination of two reference genes, actin and cob, resulted in the best stability factor. Most genomic sequences of sxtA4 from A. catenella were in a clade that included sequences from Alexandrium fundyense Group I, however, one paralogue was not related to the others, suggesting recombination or lateral transfer. A comparison of the sxtA4 cDNA sequences with genomic DNA sequences indicated the possibility of transcript editing and the preferential transcription of certain genomic DNA loci. The results show that, in dinoflagellates, post-transcriptional mechanisms play a major role in the regulation of saxitoxin biosynthesis.
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Affiliation(s)
- Maria Wiese
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Sydney Institute of Marine Science, Chowder Bay Rd, Mosman, NSW 2088, Australia.
| | - Shauna A Murray
- Sydney Institute of Marine Science, Chowder Bay Rd, Mosman, NSW 2088, Australia; Plant Functional Biology and Climate Change Cluster, University of Technology, Sydney, NSW 2007, Australia
| | - Alfonsus Alvin
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
| | - Brett A Neilan
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Sydney Institute of Marine Science, Chowder Bay Rd, Mosman, NSW 2088, Australia.
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Wiese M, Murray SA, Alvin A, Neilan BA. WITHDRAWN: Gene expression and molecular evolution of sxtA4 in a saxitoxin producing dinoflagellate Alexandrium catenella. Toxicon 2014:S0041-0101(14)00193-7. [PMID: 25080311 DOI: 10.1016/j.toxicon.2014.07.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 07/08/2014] [Accepted: 07/15/2014] [Indexed: 10/25/2022]
Abstract
This article has been withdrawn at the request of the authors and editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
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Affiliation(s)
- Maria Wiese
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Sydney Institute of Marine Science, Chowder Bay Rd, Mosman, NSW 2088, Australia
| | - Shauna A Murray
- Sydney Institute of Marine Science, Chowder Bay Rd, Mosman, NSW 2088, Australia; Plant Functional Biology and Climate Change Cluster, University of Technology, Sydney, NSW 2007, Australia
| | - Alfonsus Alvin
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Sydney Institute of Marine Science, Chowder Bay Rd, Mosman, NSW 2088, Australia
| | - Brett A Neilan
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Sydney Institute of Marine Science, Chowder Bay Rd, Mosman, NSW 2088, Australia
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Guo R, Ki JS. Evaluation and validation of internal control genes for studying gene expression in the dinoflagellate Prorocentrum minimum using real-time PCR. Eur J Protistol 2011; 48:199-206. [PMID: 22209541 DOI: 10.1016/j.ejop.2011.11.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2011] [Revised: 11/01/2011] [Accepted: 11/07/2011] [Indexed: 10/14/2022]
Abstract
Housekeeping genes (HKGs) are required for the normalization of expression levels in real-time PCR, and their selection is critical for gene expression studies. However, stable expressions of candidate HKGs vary among organisms and tissues and even according to environmental conditions. Here, we evaluated the gene expressions of 10 frequently used HKGs, including 18S rRNA, P2, ACT, TUA, TUB, CYC, eIF4E, MDH, UBQ, and GAPDH, with a total of 17 RNA samples extracted from the dinoflagellate Prorocentrum minimum. All the RNAs were prepared from various cells cultured under different conditions, including thermal shocks, toxic chemical exposures, and different life stages. Via C(T) analyses of the 10 HKGs using the geNorm software, TUA was selected as the most stable HKG for gene expression studies of the dinoflagellate, followed by MDH. Pair-wise variation (V) analysis showed that at least 2 genes were required for accurate normalization of gene expression studies depending on the experimental conditions. These HKGs are useful internal controls for the normalization of gene expression in P. minimum.
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Affiliation(s)
- Ruoyu Guo
- Department of Green Life Science, Sangmyung University, Seoul 110-743, South Korea
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Kellmann R, Stüken A, Orr RJS, Svendsen HM, Jakobsen KS. Biosynthesis and molecular genetics of polyketides in marine dinoflagellates. Mar Drugs 2010; 8:1011-48. [PMID: 20479965 PMCID: PMC2866473 DOI: 10.3390/md8041011] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Revised: 03/17/2010] [Accepted: 03/26/2010] [Indexed: 11/20/2022] Open
Abstract
Marine dinoflagellates are the single most important group of algae that produce toxins, which have a global impact on human activities. The toxins are chemically diverse, and include macrolides, cyclic polyethers, spirolides and purine alkaloids. Whereas there is a multitude of studies describing the pharmacology of these toxins, there is limited or no knowledge regarding the biochemistry and molecular genetics involved in their biosynthesis. Recently, however, exciting advances have been made. Expressed sequence tag sequencing studies have revealed important insights into the transcriptomes of dinoflagellates, whereas other studies have implicated polyketide synthase genes in the biosynthesis of cyclic polyether toxins, and the molecular genetic basis for the biosynthesis of paralytic shellfish toxins has been elucidated in cyanobacteria. This review summarises the recent progress that has been made regarding the unusual genomes of dinoflagellates, the biosynthesis and molecular genetics of dinoflagellate toxins. In addition, the evolution of these metabolic pathways will be discussed, and an outlook for future research and possible applications is provided.
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Affiliation(s)
- Ralf Kellmann
- University of Bergen, Department of Molecular Biology, 5020 Bergen, Norway; E-Mail:
| | - Anke Stüken
- University of Oslo, Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), 0316 Oslo, Norway; E-Mails:
(A.S.);
(K.S.J.)
- University of Oslo, Department of Biology, Microbial Evolution Research Group (MERG), 0316 Oslo, Norway; E-Mail:
| | - Russell J. S. Orr
- University of Oslo, Department of Biology, Microbial Evolution Research Group (MERG), 0316 Oslo, Norway; E-Mail:
| | - Helene M. Svendsen
- University of Bergen, Department of Molecular Biology, 5020 Bergen, Norway; E-Mail:
| | - Kjetill S. Jakobsen
- University of Oslo, Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), 0316 Oslo, Norway; E-Mails:
(A.S.);
(K.S.J.)
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Hou Y, Zhang H, Miranda L, Lin S. Serious overestimation in quantitative PCR by circular (supercoiled) plasmid standard: microalgal pcna as the model gene. PLoS One 2010; 5:e9545. [PMID: 20221433 PMCID: PMC2832698 DOI: 10.1371/journal.pone.0009545] [Citation(s) in RCA: 158] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2009] [Accepted: 02/14/2010] [Indexed: 12/02/2022] Open
Abstract
Quantitative real-time PCR (qPCR) has become a gold standard for the quantification of nucleic acids and microorganism abundances, in which plasmid DNA carrying the target genes are most commonly used as the standard. A recent study showed that supercoiled circular confirmation of DNA appeared to suppress PCR amplification. However, to what extent to which different structural types of DNA (circular versus linear) used as the standard may affect the quantification accuracy has not been evaluated. In this study, we quantitatively compared qPCR accuracies based on circular plasmid (mostly in supercoiled form) and linear DNA standards (linearized plasmid DNA or PCR amplicons), using proliferating cell nuclear gene (pcna), the ubiquitous eukaryotic gene, in five marine microalgae as a model gene. We observed that PCR using circular plasmids as template gave 2.65-4.38 more of the threshold cycle number than did equimolar linear standards. While the documented genome sequence of the diatom Thalassiosira pseudonana shows a single copy of pcna, qPCR using the circular plasmid as standard yielded an estimate of 7.77 copies of pcna per genome whereas that using the linear standard gave 1.02 copies per genome. We conclude that circular plasmid DNA is unsuitable as a standard, and linear DNA should be used instead, in absolute qPCR. The serious overestimation by the circular plasmid standard is likely due to the undetected lower efficiency of its amplification in the early stage of PCR when the supercoiled plasmid is the dominant template.
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Affiliation(s)
- Yubo Hou
- Department of Marine Sciences, University of Connecticut, Groton, Connecticut, United States of America.
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Chung CC, Hwang SPL, Chang J. The identification of three novel genes involved in the rapid-growth regulation in a marine diatom, Skeletonema costatum. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2009; 11:356-367. [PMID: 18841415 DOI: 10.1007/s10126-008-9150-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Accepted: 09/20/2008] [Indexed: 05/26/2023]
Abstract
In order to understand the molecular mechanism of growth regulation in phytoplankton and to develop novel growth-status indicators, a subtraction cDNA library was constructed by using the mRNA extracted from Skeletonema costatum in the rapid-growth stage (RG stage), and three RG-stage-related cDNA fragments, RG#14, RG#25, and RG#42, were obtained. According to the results of sequence analysis, RG#42 belonged to the MCM2-7 protein family, and the other two fragments, RG#14 and RG#25, were novel molecules. Under continuous illumination, these RG-stage-related mRNA expression levels increased from 100- (RG#14 and RG#42) to 1,000-fold (RG#25) with increasing growth rate. Furthermore, under a diel rhythm of light (light-dark = 12:12 h), the daily mean mRNA abundances of RG#14 and RG#25 in the exponential phase also differed from those in the late-stationary phase. However, such differences between these growth phases were not observed in the mRNA levels of RG#42 and PCNA. This study not only provided a new way to investigate the regulatory mechanisms of cell growth but also offered a possibility of employing these gene fragments as indicators to monitor the growth status of phytoplankton in the marine environment.
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Affiliation(s)
- Chih-Ching Chung
- Center for Marine Bioscience and Biotechnology, National Taiwan Ocean University, Keelung, Taiwan, Republic of China.
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Zhang H, Hou Y, Miranda L, Campbell DA, Sturm NR, Gaasterland T, Lin S. Spliced leader RNA trans-splicing in dinoflagellates. Proc Natl Acad Sci U S A 2007; 104:4618-23. [PMID: 17360573 PMCID: PMC1838650 DOI: 10.1073/pnas.0700258104] [Citation(s) in RCA: 290] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2006] [Indexed: 12/31/2022] Open
Abstract
Through the analysis of hundreds of full-length cDNAs from fifteen species representing all major orders of dinoflagellates, we demonstrate that nuclear-encoded mRNAs in all species, from ancestral to derived lineages, are trans-spliced with the addition of the 22-nt conserved spliced leader (SL), DCCGUAGCCAUUUUGGCUCAAG (D = U, A, or G), to the 5' end. SL trans-splicing has been documented in a limited but diverse number of eukaryotes, in which this process makes it possible to translate polycistronically transcribed nuclear genes. In SL trans-splicing, SL-donor transcripts (SL RNAs) contain two functional domains: an exon that provides the SL for mRNA and an intron that contains a spliceosomal (Sm) binding site. In dinoflagellates, SL RNAs are unusually short at 50-60 nt, with a conserved Sm binding motif (AUUUUGG) located in the SL (exon) rather than the intron. The initiation nucleotide is predominantly U or A, an unusual feature that may affect capping, and hence the translation and stability of the recipient mRNA. The core SL element was found in mRNAs coding for a diverse array of proteins. Among the transcripts characterized were three homologs of Sm-complex subunits, indicating that the role of the Sm binding site is conserved, even if the location on the SL is not. Because association with an Sm-complex often signals nuclear import for U-rich small nuclear RNAs, it is unclear how this Sm binding site remains on mature mRNAs without impeding cytosolic localization or translation of the latter. The sequences reported in this paper have been deposited in the GenBank database (accession nos. AF 512889, DQ 864761-DQ 864971, DQ 867053-DQ 867070, DQ 884413-DQ 884451, EF 133854-EF 133905, EF 133961-EF 134003, EF 134083-EF 134402, EF 141835, and EF 143070-EF 143105).
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Affiliation(s)
- Huan Zhang
- *Department of Marine Sciences, University of Connecticut, 1080 Shennecossett Road, Groton, CT 06340
| | - Yubo Hou
- *Department of Marine Sciences, University of Connecticut, 1080 Shennecossett Road, Groton, CT 06340
| | - Lilibeth Miranda
- *Department of Marine Sciences, University of Connecticut, 1080 Shennecossett Road, Groton, CT 06340
| | - David A. Campbell
- Department of Microbiology, Immunology and Molecular Genetics, David Geffen School of Medicine, University of California, 609 Charles Young Drive, Los Angeles, CA 90095; and
| | - Nancy R. Sturm
- Department of Microbiology, Immunology and Molecular Genetics, David Geffen School of Medicine, University of California, 609 Charles Young Drive, Los Angeles, CA 90095; and
| | - Terry Gaasterland
- Scripps Institution of Oceanography, University of California at San Diego, 8602 La Jolla Shores Drive, La Jolla, CA 92037
| | - Senjie Lin
- *Department of Marine Sciences, University of Connecticut, 1080 Shennecossett Road, Groton, CT 06340
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Mayfield AB, Gates RD. Osmoregulation in anthozoan-dinoflagellate symbiosis. Comp Biochem Physiol A Mol Integr Physiol 2007; 147:1-10. [PMID: 17317249 DOI: 10.1016/j.cbpa.2006.12.042] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2006] [Revised: 12/14/2006] [Accepted: 12/15/2006] [Indexed: 01/17/2023]
Abstract
Endosymbiosis creates a unique osmotic circumstance. Hosts are not only responsible for balancing their internal osmolarity with respect to the external environment, but they must also maintain a compatible osmotic environment for their endosymbionts, which may themselves contribute to the net osmolarity of the host cell through molecular fluxes and/or exchange. Cnidarian hosts that harbor intracellular dinoflagellates (zooxanthellae) are excellent examples of such a symbiosis. These associations are characterized by the exchange of osmotically active compounds, but they are temporally stable under normal environmental conditions indicating that these osmotically driven exchanges are effectively and rapidly regulated. Although we have some knowledge about how asymbiotic anthozoans and algae osmoregulate, our understanding of the physiological mechanisms involved in regulating an intact anthozoan-dinoflagellate symbiosis is poor. Large-scale expulsion of endosymbiotic zooxanthellae, or bleaching, is currently considered to be one of the greatest threats to coral reefs worldwide. To date, there has been little consideration of the osmotic scenarios that occur when these symbioses are exposed to the conditions that normally elicit bleaching, such as increased seawater temperatures and UV radiation. Here we review what is known about osmoregulation and osmotic stress in anthozoans and dinoflagellates and discuss the osmotic implications of exposure to environmental stress in these globally distributed and ecologically important symbioses.
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Affiliation(s)
- Anderson B Mayfield
- University of Hawaii, Hawaii Institute of Marine Biology, PO Box 1346, Kaneohe, HI 96744, USA.
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Zhang H, Hou Y, Lin S. Isolation and characterization of proliferating cell nuclear antigen from the dinoflagellate Pfiesteria piscicida. J Eukaryot Microbiol 2006; 53:142-50. [PMID: 16579817 DOI: 10.1111/j.1550-7408.2005.00085.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Proliferating cell nuclear antigen (PCNA), a co-factor of DNA polymerases delta and epsilon, is essential for DNA replication and repair. Understanding the structure and expression characteristics of this gene in dinoflagellates would enable us to gain insights into how the cell cycle in these enigmatic eukaryotes is regulated and whether this gene can be a growth marker of these ecologically important organisms. We analyzed pcna and its encoded protein from Pfiesteria piscicida (Ppi_PCNA). Using reverse transcription-polymerase chain reaction (RT-PCR) and RNA ligase mediated-rapid amplification of cDNA ends (RLM-RACE) methods, Ppi_pcna cDNA was isolated; it contained a coding region for 258 amino acid residues (aa) preceded by various 5'- and 3'-untranslated ends. The deduced protein length was similar to that of typical vertebrate and plant PCNA. PCR using genomic DNA as the template yielded multiple products whose sequences revealed multiple copies of pcna in tandem repeats separated by an unknown sequence. Using real-time PCR, we estimated 41+/-7 copies of this gene in each P. piscicida cell. Reverse transcription real-time PCR indicated a similar pcna mRNA level between the exponential and the stationary growth phases. Western blot analysis revealed a slightly higher PCNA level (<2-fold) in the exponential than in the stationary growth phases. We conclude that (1) P. piscicida possesses a typical eukaryote PCNA; (2) unlike in other eukaryotes, pcna in P. piscicida occurs in multiple copies arranged in tandem; and (3) regulation of P. piscicida PCNA probably lies in post-translational modification.
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Affiliation(s)
- Huan Zhang
- Department of Marine Sciences, University of Connecticut, Groton, Connecticut 06340, USA
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Lidie KB, Ryan JC, Barbier M, Van Dolah FM. Gene expression in Florida red tide dinoflagellate Karenia brevis: analysis of an expressed sequence tag library and development of DNA microarray. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2005; 7:481-93. [PMID: 15976935 DOI: 10.1007/s10126-004-4110-6] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2004] [Accepted: 12/15/2004] [Indexed: 05/03/2023]
Abstract
Karenia brevis (Davis) is the dinoflagellate responsible for nearly annual red tides in the Gulf of Mexico. Although the mechanisms regulating the growth and toxicity of this problematic organism are of considerable interest, little information is available on its molecular biology. We therefore constructed a complementary DNA library from which to gain insight into its expressed genome and to develop tools for studying its gene expression. Large-scale sequencing yielded 7001 high-quality expressed sequence tags (ESTs), which clustered into 5280 unique gene groups. The vast majority of genes expressed fell into a low-abundance class, with the highest expressed gene accounting for only 1% of the total ESTs. Approximately 29% of genes were found to have similarity to known sequences in other organisms after BLAST similarity comparisons to the GenBank public protein database using a cutoff of P < 10e(-4). We identified for the first time in a dinoflagellate a suite of conserved eukaryotic genes involved in cell cycle control, intracellular signaling, and the transcription and translation machinery. At least 40% of gene clusters displayed single nucleotide polymorphisms, suggesting the presence of multiple gene copies. The average GC content of ESTs was 51%, with a slight preference for G or C in the third codon position (53.5%). The ESTs were used to develop an oligonucleotide microarray containing 4629 unique features and 3462 replicate probes. Microarray labeling has been optimized, and the microarray has been validated for probe specificity and reproducibility. This is the first information to be developed on the expressed genome of K. brevis and provides the basis from which to begin functional genomic studies on this harmful algal bloom species.
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Affiliation(s)
- Kristy B Lidie
- Marine Biotoxins Program, NOAA Center for Coastal Environmental and Biomolecular Research, SC 29412, USA
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