Updated on 2025/10/03

写真a

 
UEKI Shoko
 
Organization
Scheduled update Associate Professor
Position
Associate Professor
External link

Degree

  • 博士(理学) ( 東京工業大学 )

Research Interests

  • Heterosigma akashiwo

  • ecophysiology

  • cell biology

  • molecular biology

  • microbial ecology

Research Areas

  • Environmental Science/Agriculture Science / Environmental agriculture  / 水圏生命科学

  • Life Science / Molecular biology

  • Life Science / Cell biology

Education

  • Tokyo Institute of Technology   大学院生命理工学研究科  

    1994.4 - 1997.3

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  • University of Tsukuba   環境科学研究科  

    1992.4 - 1994.7

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  • Nagoya University   理学部  

    1988.4 - 1992.3

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    Country: Japan

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Research History

  • Okayama University   Institute of Plant Science and Resources   Associate Professor

    2017.9

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  • Okayama University   Institute of Plant Science and Resources   Assistant Professor

    2011.9 - 2017.7

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  • State University of New York αt Stony Brook   Department of Biochemistry and Cell Biology   Research Assistant Professor

    2007.8 - 2011.8

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    Country:United States

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  • State University of New York at Stony Brook   Department of Biochemistry and Cell Biology

    1998.9 - 2007.7

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    Country:United States

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  • Japan Society for Promotion of Science   東京工業大学 生命理工学部

    1997.4 - 1998.8

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Professional Memberships

 

Papers

  • Differentiation of microbial community in coastal seawater samples before and during a Akashiwo sanguinea (Dinophyceae) bloom in urban area of Antofagasta city (northern Chile) Reviewed

    Jingming Hua, Henry Camerónc, Joaquín I. Rillingd, Marco Camposd, Tay Ruiz-Gild, Mariela A. Gonzaleze, Gonzalo Gajardo, Karen Vergarad, Leonardo Guzmán, Oscar Espinoza-González, Gonzalo Fuenzalida, Carlos Riquelme, Shoko Ueki, Satoshi Nagai, Fumito Maruyama, So Fujiyoshi, Kyoko Yarimizum, Ishara Pereram, Andrés Ávilae, Jacquelinne J. Acuñad, Qian Zhanga, Milko A. Jorquera

    Harmful Algae   2024.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.hal.2024.102782

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  • The dataset of de novo assembly and inferred functional annotation of the transcriptome of Heterosigma akashiwo, a bloom-forming, cosmopolitan raphidophyte. Reviewed International journal

    Masanao Sato, Masahide Seki, Yutaka Suzuki, Shoko Ueki

    Data in brief   48   109071 - 109071   2023.6

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    Heterosigma akashiwo is a eukaryotic, cosmopolitan, and unicellular alga (class: Raphidophyceae), and produces fish-killing blooms. There is a substantial scientific and practical interest in its ecophysiological characteristics that determine bloom dynamics and its adaptation to broad climate zones. A well-annotated genomic/genetic sequence information enables researchers to characterize organisms using modern molecular technology. In the present study, we conducted H. akashiwo RNA sequencing, a de novo transcriptome assembly of 84,693,530 high-quality deduplicated short-read sequences. Obtained RNA reads were assembled by Trinity assembler and 144,777 contigs were identified with N50 values of 1085. Total 60,877 open reading frames with the length of 150 bp or greater were predicted. For further analyses, top Gene Ontology terms, pfam hits, and blast hits were annotated for all the predicted genes. The raw data were deposited in the NCBI SRA database (BioProject PRJDB6241 and PRJDB15108), and the assemblies are available in NCBI TSA database (ICRV01). The annotation information can be obtained in Dryad and can be accessed via doi: 10.5061/dryad.m0cfxpp56.

    DOI: 10.1016/j.dib.2023.109071

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  • The holobiome of marine harmful algal blooms (HABs): A novel ecosystem-based approach for implementing predictive capabilities and managing decisions Reviewed

    Gonzalo Gajardo, Jesús Morón-López, Karen Vergara, Shoko Ueki, Leonardo Guzmán, Oscar Espinoza-González, Alondra Sandoval, Gonzalo Fuenzalida, Alejandro A. Murillo, Carlos Riquelme, Henry Camerón, Satoshi Nagai, Fumito Maruyama, So Fujiyoshi, Kyoko Yarimizu, Ishara Perera, Mikihiko Kawai, Andrés Ávila, Giovanni Larama, Mariela A. Gonzalez, Joaquín I. Rilling, Marco Campos, Tay Ruiz-Gil, Benjamin Durán-Vinet, Jacquelinne J. Acuña, Milko A. Jorquera

    Environmental Science & Policy   143   44 - 54   2023.5

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.envsci.2023.02.012

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  • Intraspecies variation of the mitochondrial genome: An evaluation for phylogenetic approaches based on the conventional choices of genes and segments on mitogenome. Reviewed International journal

    Jesús Morón-López, Karen Vergara, Masanao Sato, Gonzalo Gajardo, Shoko Ueki

    PloS one   17 ( 8 )   e0273330   2022

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    Intraspecies nucleotide sequence variation is a key to understanding the evolutionary history of a species, such as the geographic distribution and population structure. To date, numerous phylogenetic and population genetics studies have been conducted based on the sequences of a gene or an intergenic region on the mitochondrial genome (mtDNA), such as cytochrome c oxidase subunits or the D-loop. To evaluate the credibility of the usage of such 'classic' markers, we compared the phylogenetic inferences based on the analyses of the partial and entire mtDNA sequences. Importantly, the phylogenetic reconstruction based on the short marker sequences did not necessarily reproduce the tree topologies based on the analyses of the entire mtDNA. In addition, analyses on the datasets of various organisms revealed that the analyses based on the classic markers yielded phylogenetic trees with poor confidence in all tested cases compared to the results based on full-length mtDNA. These results demonstrated that phylogenetic analyses based on complete mtDNA sequences yield more insightful results compared to those based on mitochondrial genes and segments. To ameliorate the shortcomings of the classic markers, we identified a segment of mtDNA that may be used as an 'approximate marker' to closely reproduce the phylogenetic inference obtained from the entire mtDNA in the case of mammalian species, which can be utilized to design amplicon-seq-based studies. Our study demonstrates the importance of the choice of mitochondrial markers for phylogenetic analyses and proposes a novel approach to choosing appropriate markers for mammalian mtDNA that reproduces the phylogenetic inferences obtained from full-length mtDNA.

    DOI: 10.1371/journal.pone.0273330

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  • Suitcase Lab: new, portable, and deployable equipment for rapid detection of specific harmful algae in Chilean coastal waters Reviewed

    So Fujiyoshi, Kyoko Yarimizu, Yohei Miyashita, Joaquín Rilling, Jacquelinne J. Acuña, Shoko Ueki, Gonzalo Gajardo, Oscar Espinoza-González, Leonardo Guzmán, Milko A. Jorquera, Satoshi Nagai, Fumito Maruyama

    Environmental Science and Pollution Research   2020.11

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    <title>Abstract</title>Phytoplankton blooms, including harmful algal blooms (HABs), have serious impacts on ecosystems, public health, and productivity activities. Rapid detection and monitoring of marine microalgae are important in predicting and managing HABs. We developed a toolkit, the Suitcase Lab, to detect harmful algae species in the field. We demonstrated the Suitcase Lab’s capabilities for sampling, filtration, DNA extraction, and loop-mediated isothermal amplification (LAMP) detection in cultured <italic>Alexandrium catenella</italic> cells as well as Chilean coastal waters from four sites: Repollal, Isla García, Puerto Montt, and Metri. A LAMP assay using the Suitcase Lab in the field confirmed microscopic observations of <italic>A. catenella</italic> in samples from Repollal and Isla García. The Suitcase Lab allowed the rapid detection of <italic>A. catenella</italic>, within 2 h from the time of sampling, even at a single cell per milliliter concentrations, demonstrating its usefulness for quick and qualitative on-site diagnosis of target toxic algae species. This method is applicable not only to detecting harmful algae but also to other field studies that seek a rapid molecular diagnostic test.

    DOI: 10.1007/s11356-020-11567-5

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    Other Link: http://link.springer.com/article/10.1007/s11356-020-11567-5/fulltext.html

  • Protocols for Monitoring Harmful Algal Blooms for Sustainable Aquaculture and Coastal Fisheries in Chile Reviewed

    Kyoko Yarimizu, So Fujiyoshi, Mikihiko Kawai, Luis Norambuena-Subiabre, Emma-Karin Cascales, Joaquin-Ignacio Rilling, Jonnathan Vilugrón, Henry Cameron, Karen Vergara, Jesus Morón-López, Jacquelinne J. Acuña, Gonzalo Gajardo, Oscar Espinoza-González, Leonardo Guzmán, Milko A. Jorquera, Satoshi Nagai, Gemita Pizarro, Carlos Riquelme, Shoko Ueki, Fumito Maruyama

    International Journal of Environmental Research and Public Health   17 ( 20 )   7642 - 7642   2020.10

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    Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Harmful algae blooms (HABs) cause acute effects on marine ecosystems due to their production of endogenous toxins or their enormous biomass, leading to significant impacts on local economies and public health. Although HAB monitoring has been intensively performed at spatiotemporal scales in coastal areas of the world over the last decades, procedures have not yet been standardized. HAB monitoring procedures are complicated and consist of many methodologies, including physical, chemical, and biological water sample measurements. Each monitoring program currently uses different combinations of methodologies depending on site specific purposes, and many prior programs refer to the procedures in quotations. HAB monitoring programs in Chile have adopted the traditional microscopic and toxin analyses but not molecular biology and bacterial assemblage approaches. Here we select and optimize the HAB monitoring methodologies suitable for Chilean geography, emphasizing on metabarcoding analyses accompanied by the classical tools with considerations including cost, materials and instrument availability, and easiness and efficiency of performance. We present results from a pilot study using the standardized stepwise protocols, demonstrating feasibility and plausibility for sampling and analysis for the HAB monitoring. Such specific instructions in the standardized protocol are critical obtaining quality data under various research environments involving multiple stations, different analysts, various time-points, and long HAB monitoring duration.

    DOI: 10.3390/ijerph17207642

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  • Phylogeographic characteristics of hypervariable regions in the mitochondrial genome of a cosmopolitan, bloom-forming raphidophyte, Heterosigma akashiwo Reviewed

    Shoko Ueki

    J Phycology   2019

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  • A unique, highly variable mitochondrial gene with coding capacity of Heterosigma akashiwo, class Raphidophyceae Reviewed

    Aiko Higashi, Satoshi Nagai, Paulo S. Salomon, Shoko Ueki

    JOURNAL OF APPLIED PHYCOLOGY   29 ( 6 )   2961 - 2969   2017.12

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    DOI: 10.1007/s10811-017-1142-2

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  • A hypervariable mitochondrial protein coding sequence associated with geographical origin in a cosmopolitan bloom-forming alga, Heterosigma akashiwo Reviewed

    Aiko Higashi, Satoshi Nagai, Sergio Seone, Shoko Ueki

    BIOLOGY LETTERS   13 ( 4 )   2017.4

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1098/rsbl.2016.0976

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  • Chloroplast genome sequences of seven strains of the bloom-forming raphidophyte Heterosigma akashiwo Reviewed

    Sergio Seoane, Kiwamu Hyodo, Shoko Ueki

    Genome Announcements   5 ( 41 )   2017

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Society for Microbiology  

    DOI: 10.1128/genomeA.01030-17

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  • Selective growth promotion of bloom-forming raphidophyte Heterosigma akashiwo by a marine bacterial strain Reviewed

    Aiko Higashi, Yoshiko Fujitani, Natsuko Nakayama, Akio Tani, Shoko Ueki

    HARMFUL ALGAE   60   150 - 156   2016.12

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.hal.2016.11.009

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  • Evolution and Phylogeny of Large DNA Viruses, Mimiviridae and Phycodnaviridae Including Newly Characterized Heterosigma akashiwo Virus Reviewed

    Fumito Maruyama, Shoko Ueki

    FRONTIERS IN MICROBIOLOGY   7   1942   2016.11

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3389/micb.2016.01942

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  • Mitochondrial genome sequences of four strains of the bloom-forming raphidophyte Heterosigma akashiwo Reviewed

    Yoshitoshi Ogura, Natsuko Nakayama, Tetsuya Hayashi, Shoko Ueki

    Genome Announcements   4 ( 6 )   2016

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Society for Microbiology  

    DOI: 10.1128/genomeA.01288-16

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  • Complete genome sequence of a phycodnavirus, Heterosigma akashiwo virus strain 53 Reviewed

    Yoshitoshi Ogura, Tetsuya Hayashi, Shoko Ueki

    Genome Announcements   4 ( 6 )   2016

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Society for Microbiology  

    DOI: 10.1128/genomeA.01279-16

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  • Plasmodesmata-associated proteins: Can we see the whole elephant? Reviewed

    Shoko Ueki, Vitaly Citovsky

    Plant Signaling and Behavior   9 ( 2 )   e27899   2014

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Landes Bioscience  

    DOI: 10.4161/psb.27899

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  • Identification of a movement protein of Mirafiori lettuce big-vein ophiovirus Reviewed

    Akihiro Hiraguri, Shoko Ueki, Hideki Kondo, Koji Nomiyama, Takumi Shimizu, Tamaki Ichiki-Uehara, Toshihiro Omura, Nobumitsu Sasaki, Hiroshi Nyunoya, Takahide Sasaya

    Journal of General Virology   94 ( 5 )   1145 - 1150   2013.5

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    DOI: 10.1099/vir.0.050005-0

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  • Transient gene expression in epidermal cells of plant leaves by biolistic DNA delivery Reviewed

    Shoko Ueki, Shimpei Magori, Benoît Lacroix, Vitaly Citovsky

    Methods in Molecular Biology   940   17 - 26   2013

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/978-1-62703-110-3_2

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  • To Gate, or Not to Gate: Regulatory Mechanisms for Intercellular Protein Transport and Virus Movement in Plants Reviewed

    Shoko Ueki, Vitaly Citovsky

    MOLECULAR PLANT   4 ( 5 )   782 - 793   2011.9

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    Authorship:Lead author, Corresponding author   Language:English  

    DOI: 10.1093/mp/ssr060

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  • Protein Membrane Overlay Assay: A Protocol to Test Interaction Between Soluble and Insoluble Proteins in vitro Reviewed

    Shoko Ueki, Benoit Lacroix, Vitaly Citovsky

    JOVE-JOURNAL OF VISUALIZED EXPERIMENTS   ( 54 )   2011.8

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3791/2961

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  • Biology of callose (beta-1,3-glucan) turnover at plasmodesmata Reviewed

    Raul Zavaliev, Shoko Ueki, Bernard L. Epel, Vitaly Citovsky

    PROTOPLASMA   248 ( 1 )   117 - 130   2011.1

  • ANK, a Host Cytoplasmic Receptor for the Tobacco mosaic virus Cell-to-Cell Movement Protein, Facilitates Intercellular Transport through Plasmodesmata Reviewed

    Shoko Ueki, Roman Spektor, Danielle M. Natale, Vitaly Citovsky

    PLOS PATHOGENS   6 ( 11 )   e1001201   2010.11

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    DOI: 10.1371/journal.ppat.1001201

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  • A cell-to-cell macromolecular transport assay in Planta utilizing biolistic bombardment. Reviewed

    Ueki S, Meyers BL, Yasmin F, Citovsky V

    Journal of visualized experiments : JoVE   ( 42 )   2010.8

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    DOI: 10.3791/2208

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  • Functional transient genetic transformation of Arabidopsis leaves by biolistic bombardment Reviewed

    Shoko Ueki, Benoit Lacroix, Alexander Krichevsky, Sondra G. Lazarowitz, Vitaly Citovsky

    NATURE PROTOCOLS   4 ( 1 )   71 - 77   2009

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    DOI: 10.1038/nprot.2008.217

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  • Identification of an interactor of cadmium ion-induced glycine-rich protein involved in regulation of callose levels in plant vasculature Reviewed

    S Ueki, Citovsky, V

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   102 ( 34 )   12089 - 12094   2005.8

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    DOI: 10.1073/pnas.0505927102

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  • Control improves with age: Intercellular transport in plant embryos and adults Reviewed

    S Ueki, Citovsky, V

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   102 ( 6 )   1817 - 1818   2005.2

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  • The systemic movement of a tobamovirus is inhibited by a cadmium-ion-induced glycine-rich protein Reviewed

    S Ueki, Citovsky, V

    NATURE CELL BIOLOGY   4 ( 7 )   478 - 485   2002.7

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    DOI: 10.1038/ncb806

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  • RNA commutes to work: regulation of plant gene expression by systemically transported RNA molecules Reviewed

    S Ueki, Citovsky, V

    BIOESSAYS   23 ( 12 )   1087 - 1090   2001.12

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    DOI: 10.1002/bies.10027

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  • Inhibition of systemic onset of post-transcriptional gene silencing by non-toxic concentrations of cadmium Reviewed

    S Ueki, Citovsky, V

    PLANT JOURNAL   28 ( 3 )   283 - 291   2001.11

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    DOI: 10.1046/j.1365-313X.2001.01145.x

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  • Activity-independent cell adhesion to tissue-type transglutaminase is mediated by alpha 4 beta 1 integrin Reviewed

    T Isobe, H Takahashi, S Ueki, J Takagi, Y Saito

    EUROPEAN JOURNAL OF CELL BIOLOGY   78 ( 12 )   876 - 883   1999.12

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  • 12-hydroxy-5Z,8Z,10E,14Z, eicosatetraenoic acid (12-HETE) stimulates cAMP production in normal human fibroblasts Reviewed

    S Ueki, J Takagi, Y Kobayashi, F Sato, Y Saito

    JOURNAL OF CELLULAR PHYSIOLOGY   178 ( 1 )   63 - 68   1999.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/(SICI)1097-4652(199901)178:1<63::AID-JCP8>3.0.CO;2-J

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  • The 'ligand-induced conformational change' of alpha 5 beta 1 integrin - Relocation of alpha 5 subunit to uncover the beta 1 stalk region Reviewed

    J Tsuchida, S Ueki, Y Takada, Y Saito, J Takagi

    JOURNAL OF CELL SCIENCE   111   1759 - 1766   1998.6

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  • Classification of 'activation' antibodies against integrin beta 1 chain Reviewed

    J Tsuchida, S Ueki, Y Saito, J Takagi

    FEBS LETTERS   416 ( 2 )   212 - 216   1997.10

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    DOI: 10.1016/S0014-5793(97)01206-4

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  • Dual functions of transglutaminase in novel cell adhesion Reviewed

    S Ueki, J Takagi, Y Saito

    JOURNAL OF CELL SCIENCE   109   2727 - 2735   1996.11

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  • Identification of factor-XIIIa-reactive glutaminyl residues in the propolypeptide of bovine von Willebrand factor.

    Takagi J, Aoyama T, Ueki S, Ohba H, Saito Y, Lorand L

    1995.9

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    DOI: 10.1111/j.1432-1033.1995.773zz.x

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Presentations

  • Study on bacterivory and nutrition acquisition of Heterosigma akashiwo

    Shoko Ueki

    2024.12.4 

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    Event date: 2024.12.3 - 2024.12.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • リン⽋乏状態における海洋細菌による⾚潮原因藻の増殖促進機構の解明

    福山 誠也, 宇佐美 文子, 小原 静香, 隠塚 俊光, 近藤 健, 小池 和彦, 植木 尚子

    おかやまバイオアクティブ研究会  2024.6.6 

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    Event date: 2024.6.6

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  • A marine bacterium promotes the growth of a bloom-forming phytoplankton under phosphorus-depletion

    Seiya Fukuyama, Fumiko Usami, Shizuka Ohara, Toshimitsu Onduka, Ken Kondo, Kazuhiko Koike, Shoko Ueki

    2023.11.28 

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    Event date: 2023.11.28 - 2023.11.30

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  • Characterization of marine bacteria that support growth of Heterosigma akashiwo under phosphate-limiting conditions

    Shoko Ueki

    International Conference on Harmful Algae 2023  2023.11.6 

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    Event date: 2023.11.6 - 2023.11.10

    Language:English   Presentation type:Oral presentation (general)  

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  • Characterization of Marine Bacteria That Support Growth of Harmful Algae Under Nutritionally Limiting Conditions. Invited

    Shoko Ueki

    Annual Meeting of Society of Microbiology in Chile  2021.11.30 

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    Event date: 2021.11.29 - 2021.11.30

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • リン欠乏条件下においてHeterosigma akashiwoがリン源とするポリリン酸合成細菌の発見.

    宇佐美文子, 小原静香, 隠塚俊満, 近藤健, 中嶋昌紀, 小池一彦, 植木尚子

    微生物生態学会年会  2021.10.30 

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    Event date: 2021.10.30 - 2021.11.2

    Language:Japanese   Presentation type:Poster presentation  

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  • Gene Manipulation Techniques in Heterosigma Akashiwo

    Nanami Nakayama , Shoko Ueki , Ayano Satoh

    日本分子生物学会年会  日本分子生物学会

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    Event date: 2020.12.2 - 2020.12.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:online  

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  • 赤潮原因種Heterosigma akashiwoの遺伝子操作技術

    中山七海,植木尚子,佐藤あやの

    日本生物工学会西日本支部大会(第5回講演会)  日本生物工学会

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    Event date: 2020.11.14

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山理科大学  

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  • 赤潮原因藻ヘテロシグマの系統地理学的マーカーの確立を目指した研究

    妹尾美紀, 平松諒也, Anette Engesmo, Brian D. Bill, Vera L. Trainer, 長井敏, 門田有希, 植木尚子

    日本育種学会・第 11 回中国地域育種談話会  岡山大学

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    Event date: 2019.12.21 - 2019.12.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山大学津島キャンパス自然科学研究科棟 大講義室  

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  • 赤潮原因藻ヘテロシグマのバイオテクノロジー的利用をめざした遺伝子導入法の検討

    佐藤あやの、楠本恭平、植木尚子

    赤潮原因藻ヘテロシグマのバイオテクノロジー的利用をめざした遺伝子導入法の検討  日本分子生物学会

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    Event date: 2019.12.3 - 2019.12.6

    Language:Japanese   Presentation type:Poster presentation  

    Venue:福岡国際会議場  

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  • Toward understanding ecophysiology of a bloom-forming alga, Heterosigma akashiwo Invited International conference

    Shoko Ueki

    International Symposium: “Advances in Environmental Microbiology and Microbial Biotechnology”  N?cleo Cient?fico Tecnol?gico de la Universidad de La Frontera BIOREN-UFRO

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    Event date: 2018.12.6 - 2018.12.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Pucon, Chile  

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  • A hypervariable mitochondrial gene associated with geographical origin in a cosmopolitan bloom-forming alga, Heterosigma akashiwo International conference

    Shoko Ueki

    International Conference for Harmful Algae  International Society for the Study of Harmful Algae

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    Event date: 2018.10.21 - 2018.10.26

    Language:English   Presentation type:Poster presentation  

    Venue:Nantes, France  

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  • 赤潮原因藻ヘテロシグマのミトコンドリア・ゲノム上に存在する水域特異的な超可変領域配列についての研究

    植木 尚子

    2017環境微生物学系学会合同年会  東北大学

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    Event date: 2017.8.29 - 2017.8.31

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学  

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  • Whole Genome sequence of Heterosigma akashiwo virus 53 International conference

    Shoko Ueki

    8th Aquatic Virus workshop  Plymouth University

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    Event date: 2016.7.10 - 2016.7.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Plymouth, Devon, UK  

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  • 大型二本鎖DNAウイルス:多因子・多層制御による宿主感染機序の理解を目指して

    植木尚子

    新学術領域研究『ゲノム支援』拡大班会議  新学術領域研究『ゲノム支援』遺伝研事務局

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    Event date: 2015.8.27 - 2015.8.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都国際会議場  

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  • 大型二本鎖DNAウイルス:多因子・多層制御による宿主感染機序の理解を目指して

    植木尚子

    ウイルス感染現象における宿主細胞コンピテンシーの分子基盤 第6回領域会議  ウイルス感染現象における宿主細胞コンピテンシーの分子基盤 領域事務局

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    Event date: 2015.5.24 - 2015.5.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Growth promotion of Heterosigma akashiwo by marine microorganisms; implication of marine bacterium in bloom formation International conference

    Shoko Ueki

    16th International Conference of Harmful Algae 

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    Event date: 2014.10.26 - 2014.10.31

    Language:English   Presentation type:Oral presentation (general)  

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  • ウイルス・宿主共存機構:宿主個体群構造ダイナミクスの生理生態学的・数理学的解析

    植木 尚子

    新学術領域研究『ゲノム支援』拡大班会議 

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    Event date: 2014.8.20 - 2014.8.21

    Language:Japanese   Presentation type:Poster presentation  

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Awards

  • 長瀬研究振興賞

    2013.3   公益財団法人長瀬科学技術振興財団  

    植木尚子

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Research Projects

  • ラフィド藻ヘテロシグマをモデルとした赤潮形成を支える増殖加速と代謝機構の解明

    Grant number:25K02346  2025.04 - 2029.03

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    植木 尚子

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    Authorship:Principal investigator 

    Grant amount:\18720000 ( Direct expense: \14400000 、 Indirect expense:\4320000 )

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  • 赤潮原因藻ヘテロシグマの赤潮形成期における増殖加速機構の解明を目指した研究

    Grant number:24K21840  2024.06 - 2026.03

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

    植木 尚子

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    Authorship:Principal investigator 

    Grant amount:\6370000 ( Direct expense: \4900000 、 Indirect expense:\1470000 )

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  • Characterization of a novel bloom-forming mechanism based on interaction between astaxanthin-producing marine bacteria and a bloom-forming alga

    Grant number:21K19148  2021.07 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

    植木 尚子

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    Authorship:Principal investigator 

    Grant amount:\6240000 ( Direct expense: \4800000 、 Indirect expense:\1440000 )

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  • Characterization of the nutritional complementation by marine bacteria in the process of algal bloom formation

    Grant number:21H02285  2021.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    植木 尚子, 隠塚 俊満, 小原 静夏, 近藤 健

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    Authorship:Principal investigator 

    Grant amount:\17160000 ( Direct expense: \13200000 、 Indirect expense:\3960000 )

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  • Effect of anthropogenic chemicals on primary production in coastal areas: elucidation of combined effects of limiting nutrient and strong light

    Grant number:20H03067  2020.04 - 2023.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    隠塚 俊満, 小池 一彦, 植木 尚子, 小原 静夏

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    Authorship:Coinvestigator(s) 

    Grant amount:\17550000 ( Direct expense: \13500000 、 Indirect expense:\4050000 )

    和歌山市から広島県呉市にかけて陸域から瀬戸内海本州側の採水調査を実施し,昨年度確立した人為起源化学物質(AC)である抗生物質および除草剤の分析法を用いて環境水中濃度を測定した。その結果,広島県三原市,兵庫県姫路市,大阪府忠岡町から合計濃度100-250ng/Lと,比較的高濃度でACが検出された。これらの調査地点は下水処理場や下水汚泥処理場から直線距離で概ね500m未満であり,これらの処理水の影響が推定された。
    瀬戸内海で検出されるACと本海域で優占する植物プランクトン種を用いて影響試験を行った。除草剤ジウロンとブロマシルの50%光合成阻害濃度(EC50-ETR)は珪藻2種よりも鞭毛藻2種で低くかった一方で,50%増殖阻害濃度(EC50-μ)は種間差がほぼ無いか,寧ろ珪藻2種の方が低かった。これは珪藻が除草剤による光合成阻害によって増殖も阻害される一方で,鞭毛藻は光合成を阻害されても増殖速度をある程度維持できることを示唆した。抗生物質クラリスロマイシン,クリンダマイシン,アジスロマイシンのEC50-ETRおよびEC50-μはどちらも珪藻2種の方が鞭毛藻2種よりも低く,光合成阻害と増殖阻害で同じ傾向を示した。これは抗生物質が光合成だけでなく他の代謝経路(呼吸など)も阻害する可能性を示唆した。植物プランクトン種ごとに比較すると,何れの指標を用いても珪藻Skeletonema costatumは抗生物質に対する感受性が特に高かった。
    2021年6-10月に月1回,広島県福山市の一級河川芦田川河口と河口近くに位置する田尻港の表層水を採取し,現場海水の化学物質を等倍,5倍,10倍,50倍に濃縮した濃縮液を珪藻S. costatumに曝露し培養試験を行った。芦田川河口試水では6月の10, 50倍,8月の50倍で,田尻港試水では7, 8, 10月の50倍濃縮区で50%以上増殖が阻害された。

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  • 赤潮形成を促進する海洋細菌の単離同定と、赤潮動態予測法の開発

    2019.04 - 2022.03

    特定非営利活動法人 瀬戸内海研究会議  大阪湾圏域の海域環境再生・創造に関する研究助成制度 

    植木尚子

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  • 赤潮発生の謎を解く 〜赤潮原因藻の増殖速度制御機構の解明〜

    2018.10 - 2019.09

    積水化学工業株式会社  積水化学 自然に学ぶものづくり助成 

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    Authorship:Principal investigator 

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  • チリにおける持続可能な沿岸漁業及び養殖に資する赤潮早期予測システムの構築と運用

    2018.04 - 2023.03

    Japan Science and Technology Agency  Science and Technology Research Partnership for Sustainable Development  生物資源

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    Authorship:Principal investigator 

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  • 大型二本鎖DNAウイルス:多因子・多層制御による宿主感染機序の理解を目指して

    Grant number:15H01263  2015.04 - 2017.03

    日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

    植木 尚子

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    Grant amount:\5850000 ( Direct expense: \4500000 、 Indirect expense:\1350000 )

    本研究は、赤潮原因藻ヘテロシグマ(学名 Heterosigma akashiwo)に感染する大型二本鎖DNAウイルス( 以下GDNAVと略)であるHeterosigma akashiwo virus(HaV)の特性を明らかにし、また、その感染戦略を理解するために行った。まず、HaVの1系統であるHaV53の全長配列を解読し、遺伝子予測を行ったところ、HaV53は247遺伝子を持ち、また、3つのtRNAをコードすることが明らかになった。その遺伝子配列を、他のGDNAVゲノムと比較・精査したところ、HaV53は、他のGDNAVとは異なる特徴を持ったウイルスであることが明らかとなった。
    GDNAは、Nucleocytoplasmic large dsDNA virusとも呼ばれ、その増幅・転写は、多くは宿主核周辺で、その機能を利用して起こると理解されてきた。例えば、ウイルスゲノムが増殖する際に見られる「ウイルス工場」は、核内、あるいは核に隣接して観察され、また、これまで発表されたケースでは、感染過程で検出されるRNAはポリアデニル化されたものであることが知られてきた。しかし、HaVが感染した宿主のRNAをpolyAセレクション後にRNAseqした場合には、ウイルス由来の転写物はほとんど見出されなかった。一方、total RNAからribosomal RNAを除去したものをRNAseqした場合には、ウイルス由来転写物が検出された。つまり、HaV53感染時に検出されるウイルス遺伝子由来のRNAは、HaV53感染時の遺伝子転写は、核内RNAポリメラーゼ以外の機構を利用していることを示唆している。このような例は、GDNAVでは初めての報告であり、HaVの独自性を示すものであり、また、GDNAVの多様な感染戦略の一端を明らかにしたものと言える。

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  • Study of population dynamics of host population during viral infection

    Grant number:26291092  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Ueki Shoko, Higashi Aiko, Kobashi Rieko

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    Authorship:Principal investigator 

    Grant amount:\15990000 ( Direct expense: \12300000 、 Indirect expense:\3690000 )

    The initial goal of the project was to analyze the infection process of Heterosigma akashiwo virus (HaV) to its host population, bloom-forming algae, Heterosigma akashiwo, that consisted from strains showing the different reactions to HaV infection. During the project, we completed the whole genome sequencing and gene predictions of HaV, and obtained the insights into the evolutionary and phylogenetical position to other giant double-stranded DNA viruses. In addition, contradicting to the initial understanding, we found out that the host reactions to HaV infection were not only determined by the host genotypes, but also by the presence/absence or the species of the accomplice bacteria associating to the host. The project developed into direction unpredicted when it was initially planed: however, the insights obtained by the project will provide infrastructure for future studies about H. akashiwo and its virus from cellular and molecular biology view points.

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  • Regulation mechanism of propagation of Heterosigma akashiwo in environment

    Grant number:26660153  2014.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    Ueki Shoko, Nakayama Natsuko

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    Grant amount:\3900000 ( Direct expense: \3000000 、 Indirect expense:\900000 )

    Algal bloom is typically caused by aberrant propagation of a single species, resulting in its predomination in the local population. While environmental factors including temperature and eutrophication are linked to bloom, the precise mechanism of its formation process is still unknown. We isolated several bactaria that promote growth of the bloom-forming alga, Heterosigma akashiwo. One of the strains, YF1, did not affect the growth of another alga, Chattonella, indicating YF1 promote growth of H. akashiwo in selective manner. H. akashiwo is known to outcompete C. ovate, resulting in dominance of the former. Adding YF1 to the co-culture of H. akashiwo and C. ovate promoted growth of H. akashiwo while further suppressing the growth of C. ovate, resulting in enhanced predominance of the former. Such selective growth promotion of algae by a mutualistic bacterium, in combination with its innate competitiveness to other algae, may underlie the single species dominance in algal blooms.

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  • 赤潮発生メカニズムの環境微生物学的理解を目指した研究

    2013.11 - 2014.10

    住友財団  環境研究助成 

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    Authorship:Principal investigator 

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  • 赤潮原因害藻ヘテロシグマの産業利用を可能にする基盤技術の確立

    2012.12 - 2013.11

    カシオ科学振興研究助成金 

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  • 赤潮プランクトンの驚異的な増殖能力を有用物質生産に利用するための基礎的研究

    2012.04 - 2013.03

    長瀬科学技術振興財団  長瀬科学技術振興財団研究助成金 

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  • トランスグルタミナーゼによる細胞接着反応に関する基礎的研究

    Grant number:97J04169  1998 - 1999

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    植木 尚子

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    Grant amount:\2400000 ( Direct expense: \2400000 )

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  • Toward the understanding of the contribution of marine bacterial metabolism on nutritional requirement for algal bloom formation

    Grant number:23K21236  2021.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    植木 尚子, 隠塚 俊満, 小原 静夏, 近藤 健, 小池 一彦

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    Grant amount:\17160000 ( Direct expense: \13200000 、 Indirect expense:\3960000 )

    本研究は、赤潮発生に必要な栄養条件の形成における環境細菌の役割解明を目指す。赤潮発生は、窒素、リン、鉄などに制限され、これらが高濃度に達する場合に赤潮が発生するとされる。一方、赤潮原因藻を自然界での赤潮に匹敵する密度まで培養するには、自然界での実測値に比べて高い濃度の栄養塩が必要となる。また、培地中の栄養塩は、藻類に利用されやすい形態である一方、環境中には藻類が直接利用できない形態の物質を多く含む。つまり、赤潮形成には、全必要栄養素が自然界ではほとんど観測されない高濃度で揃う必要があることから、自然界で、赤潮原因藻は、どのように赤潮形成に必要な栄養素を獲得するのか?という点に疑問が湧く。本研究は、環境中の細菌が、赤潮原因藻増殖に必要な栄養摂取を補完する可能性に着目し、赤潮原因藻の一種ヘテロシグマの増殖を栄養欠損 下で可能にする細菌の同定と、その機序解明を目指す。
    現在まで、ヘテロシグマ赤潮を採取し、溶存栄養濃度を測定し、ヘテロシグマ随伴細菌を単離同定した。また、赤潮が発生している海域の底泥中の細菌が、ヘテロシグマ栄養摂取に貢献する可能性に着目して、海底泥より細菌を単離した。その結果、ヘテロシグマに随伴する細菌及び底泥中の細菌について、異なるサンプリング地点より数種の共通した細菌種が単離された。特に、ヘテロシグマと共存することで、可溶性鉄の欠乏を補完する、Siderophore産生能を持つ細菌が数多く単離された。また、底泥中より、リン欠乏下でヘテロシグマ増殖を促進する細菌を二種単離した。 Siderophore産生細菌が、藻類の鉄取り込みを促進するという報告は多数ある。一方、リン欠乏条件下で藻類増殖を促進する細菌についての報告は存在しないため、特に重点を置いて研究を進めている。

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  • Engineered biosynthesis of new natural products for innovative drug discovery

    Grant number:16H06449  2016.06 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Watanabe Kenji

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    Grant amount:\72020000 ( Direct expense: \55400000 、 Indirect expense:\16620000 )

    By structural characterizations, in vitro assays of CghA and its mutants and computational analyses, we determined how a Diels-Alderase (DAase) could evade product inhibition and how CghA exerts diastereoselectivity over the [4+2] cycloaddition reaction. CghA assumes a unique fold comprised of two flattened lipocalin-like beta-barrel domains. Structural analyses combined with in vitro assays of CghA mutants permitted rational engineering of CghA to favor the disfavored exo adduct formation, indicating that subtle tuning of the shape complementarity of the binding pocket to the reaction transition state is key to establishing desired diastereoselectivity in octalin-forming DAases. The CghA and 1 complex structure and computational analyses of the CghA catalyzed reaction show that CghA is optimized to bind higher-energy transition states than those involved in the nonenzymatic reaction pathways that give alternate isomers.

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  • Validation of microbial safety in drinking water in the world by comparative genomics of Vibrio cholerae

    Grant number:16H05830  2016.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    MARUYAMA Fumito

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    Grant amount:\17420000 ( Direct expense: \13400000 、 Indirect expense:\4020000 )

    We have collected Vibrio cholerae bacteria from the natural environment in Vietnam and Japan and have used an epidemiological approach for comparative genomic analysis. In Vietnam, we isolated O1 and 139 strains, but the frequency of the isolation was less than 5% and it was almost impossible to obtain O1 and 139 strains. The strains isolated did not possess cholera toxin gene. The genomic phylogenetic tree revealed that its genomic sequence is very different from that of the clinical isolates. We also found that the dominant clones in environmental (river) isolates in Japan differed from season to season. In addition, we also performed comparative genomic analysis of cholera from "ayu" (Japanese) in Japan in the 1970s, and found that only two clones were likely to be causative ones of Japanese fish, ayu, disease.

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Other research activities

  • Heterosigma akashiwo transcriptome assembly and annotation

    2023.03

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    Transcriptome shotgun assembly (TSA) can be obateinded from https://www.ncbi.nlm.nih.gov/Traces/wgs/ICRV01
    Annotation for the TSAa can be obtained from 10.5061/dryad.m0cfxpp56

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  • ラボHP

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    https://www.rib.okayama-u.ac.jp/inv/index-j.html

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  • Topics in Plant Microbe Interactions (2024academic year) Prophase  - その他

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  • Seminar in Plant-Environmental Microbiology (2024academic year) Prophase  - その他

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  • Plant physiology 1 (2024academic year) Third semester  - 金1,金2

  • Plant-Virus/Bacteria Interactions (2024academic year) Prophase  - 木5~8

  • Advanced Study (2024academic year) Other  - その他

  • Topics in Plant Microbe Interactions (2023academic year) Prophase  - その他

  • Topics in Plant Microbe Interactions (2023academic year) Prophase  - その他

  • Seminar in Plant-Environmental Microbiology (2023academic year) Prophase  - その他

  • Seminar in Plant-Environmental Microbiology (2023academic year) Late  - その他

  • Seminar in Plant-Environmental Microbiology (2023academic year) Late  - その他

  • Seminar in Plant-Environmental Microbiology (2023academic year) Late  - その他

  • Seminar in Plant-Environmental Microbiology (2023academic year) Prophase  - その他

  • Seminar in Plant-Environmental Microbiology (2023academic year) Prophase  - その他

  • Seminar in Plant-Environmental Microbiology (2023academic year) Prophase  - その他

  • Plant physiology 1 (2023academic year) Third semester  - 金1,金2

  • Plant-Virus/Bacteria Interactions (2023academic year) Prophase  - 木5~8

  • Plant-Virus/Bacteria Interactions (2023academic year) Prophase  - 木9~12

  • Advanced Study (2023academic year) Other  - その他

  • Specific Research of Bioresources Science (2023academic year) Year-round  - その他

  • Topics in Plant Microbe Interactions (2022academic year) Prophase  - その他

  • Seminar in Plant-Environmental Microbiology (2022academic year) Prophase  - その他

  • Seminar in Plant-Environmental Microbiology (2022academic year) Late  - その他

  • Seminar in Plant-Environmental Microbiology (2022academic year) Late  - その他

  • Seminar in Plant-Environmental Microbiology (2022academic year) Prophase  - その他

  • Plant physiology 1 (2022academic year) Third semester  - 金1,金2

  • Plant-Virus/Bacteria Interactions (2022academic year) Prophase  - 木9~12

  • Specific Research of Bioresources Science (2022academic year) Year-round  - その他

  • Topics in Plant Microbe Interactions (2021academic year) Prophase  - その他

  • Seminar in Plant-Environmental Microbiology (2021academic year) Prophase  - その他

  • Seminar in Plant-Environmental Microbiology (2021academic year) Late  - その他

  • Seminar in Plant-Environmental Microbiology (2021academic year) Late  - その他

  • Seminar in Plant-Environmental Microbiology (2021academic year) Prophase  - その他

  • Plant physiology 1 (2021academic year) Third semester  - 金1,金2

  • Plant-Virus/Bacteria Interactions (2021academic year) Prophase  - 木9~12

  • Specific Research of Bioresources Science (2021academic year) Year-round  - その他

  • Seminar in Plant-Environmental Microbiology (2020academic year) Prophase  - その他

  • Seminar in Plant-Environmental Microbiology (2020academic year) Late  - その他

  • Plant-Virus/Bacteria Interactions (2020academic year) Prophase  - その他

  • Specific Research of Bioresources Science (2020academic year) Year-round  - その他

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Social Activities

  • Ohara Summer Science Internship

    Role(s):Planner, Organizing member

    Institute of Plant Science and Resources, Okayama University  2023.8.29 - 2023.9.1

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    Audience: College students

    Type:Other

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  • 大原サマーサイエンスインターンシップ

    Role(s):Planner, Organizing member

    岡山大学 資源植物科学研究所  大原サマーサイエンスインターンシップ  2022.9.5 - 2022.9.8

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    Type:Other

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Media Coverage

  • Dra Shoko Ueki, de la Univ. de Okayama y del Proyecto MACH, imparte charla sobre las algas nocivas. TV or radio program

    Colegio San Mateo de la Compañía de Jesús  Dra Shoko Ueki, de la Univ. de Okayama y del Proyecto MACH, imparte charla sobre las algas nocivas.  2023.3

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