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  1. Article ; Online: Transgenerational acclimation to acidified seawater and gene expression patterns in a sea urchin.

    Iguchi, Akira / Gibu, Kodai / Yorifuji, Makiko / Nishijima, Miyuki / Suzuki, Atsushi / Ono, Tsuneo / Matsumoto, Yukio / Inoue, Mayuri / Fujii, Masahiko / Muraoka, Daisuke / Fujita, Yamato / Takami, Hideki

    The Science of the total environment

    2024  Volume 930, Page(s) 172616

    Abstract: Transgenerational responses of susceptible calcifying organisms to progressive ocean acidification are an important issue in reducing uncertainty of future predictions. In this study, a two-generation rearing experiment was conducted using mature ... ...

    Abstract Transgenerational responses of susceptible calcifying organisms to progressive ocean acidification are an important issue in reducing uncertainty of future predictions. In this study, a two-generation rearing experiment was conducted using mature Mesocentrotus nudus, a major edible sea urchin that occurs along the coasts of northern Japan. Morphological observations and comprehensive gene expression analysis (RNA-seq) of resulting larvae were performed to examine transgenerational acclimation to acidified seawater. Two generations of rearing experiments showed that larvae derived from parents acclimated to acidified seawater tended to have higher survival and show less reduction in body size when exposed to acidified seawater of the same pH, suggesting that a positive carry-over effect occurred. RNA-seq analysis showed that gene expression patterns of larvae originated from both acclimated and non-acclimated parents to acidified seawater tended to be different than control condition, and the gene expression pattern of larvae originated from acclimated parents was substantially different than that of larvae of non-acclimated and control parents.
    MeSH term(s) Animals ; Seawater ; Acclimatization ; Sea Urchins/genetics ; Sea Urchins/physiology ; Hydrogen-Ion Concentration ; Larva/genetics ; Gene Expression ; Japan
    Language English
    Publishing date 2024-04-19
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2024.172616
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Whole-Genome Sequencing Highlights Conservative Genomic Strategies of a Stress-Tolerant, Long-Lived Scleractinian Coral, Porites australiensis Vaughan, 1918.

    Shinzato, Chuya / Takeuchi, Takeshi / Yoshioka, Yuki / Tada, Ipputa / Kanda, Miyuki / Broussard, Cédric / Iguchi, Akira / Kusakabe, Makoto / Marin, Frédéric / Satoh, Noriyuki / Inoue, Mayuri

    Genome biology and evolution

    2022  Volume 13, Issue 12

    Abstract: Massive corals of the genus Porites, common, keystone reef builders in the Indo-Pacific Ocean, are distinguished by their relative stress tolerance and longevity. In order to identify genetic bases of these attributes, we sequenced the complete genome of ...

    Abstract Massive corals of the genus Porites, common, keystone reef builders in the Indo-Pacific Ocean, are distinguished by their relative stress tolerance and longevity. In order to identify genetic bases of these attributes, we sequenced the complete genome of a massive coral, Porites australiensis. We developed a genome assembly and gene models of comparable quality to those of other coral genomes. Proteome analysis identified 60 Porites skeletal matrix protein genes, all of which show significant similarities to genes from other corals and even to those from a sea anemone, which has no skeleton. Nonetheless, 30% of its skeletal matrix proteins were unique to Porites and were not present in the skeletons of other corals. Comparative genomic analyses showed that genes widely conserved among other organisms are selectively expanded in Porites. Specifically, comparisons of transcriptomic responses of P. australiensis and Acropora digitifera, a stress-sensitive coral, reveal significant differences in regard to genes that respond to increased water temperature, and some of the genes expanded exclusively in Porites may account for the different thermal tolerances of these corals. Taken together, widely shared genes may have given rise to unique biological characteristics of Porites, massive skeletons and stress tolerance.
    MeSH term(s) Animals ; Anthozoa/genetics ; Coral Reefs ; Genome ; Genomics ; Sea Anemones/genetics ; Whole Genome Sequencing
    Language English
    Publishing date 2022-01-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2495328-3
    ISSN 1759-6653 ; 1759-6653
    ISSN (online) 1759-6653
    ISSN 1759-6653
    DOI 10.1093/gbe/evab270
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  3. Article ; Online: A snapshot of a coral "holobiont": a transcriptome assembly of the scleractinian coral, porites, captures a wide variety of genes from both the host and symbiotic zooxanthellae.

    Shinzato, Chuya / Inoue, Mayuri / Kusakabe, Makoto

    PloS one

    2014  Volume 9, Issue 1, Page(s) e85182

    Abstract: Massive scleractinian corals of the genus Porites are important reef builders in the Indo-Pacific, and they are more resistant to thermal stress than other stony corals, such as the genus Acropora. Because coral health and survival largely depend on the ... ...

    Abstract Massive scleractinian corals of the genus Porites are important reef builders in the Indo-Pacific, and they are more resistant to thermal stress than other stony corals, such as the genus Acropora. Because coral health and survival largely depend on the interaction between a coral host and its symbionts, it is important to understand the molecular interactions of an entire "coral holobiont". We simultaneously sequenced transcriptomes of Porites australiensis and its symbionts using the Illumina Hiseq2000 platform. We obtained 14.3 Gbp of sequencing data and assembled it into 74,997 contigs (average: 1,263 bp, N50 size: 2,037 bp). We successfully distinguished contigs originating from the host (Porites) and the symbiont (Symbiodinium) by aligning nucleotide sequences with the decoded Acropora digitifera and Symbiodinium minutum genomes. In contrast to previous coral transcriptome studies, at least 35% of the sequences were found to have originated from the symbionts, indicating that it is possible to analyze both host and symbiont transcriptomes simultaneously. Conserved protein domain and KEGG analyses showed that the dataset contains broad gene repertoires of both Porites and Symbiodinium. Effective utilization of sequence reads revealed that the polymorphism rate in P. australiensis is 1.0% and identified the major symbiotic Symbiodinium as Type C15. Analyses of amino acid biosynthetic pathways suggested that this Porites holobiont is probably able to synthesize most of the common amino acids and that Symbiodinium is potentially able to provide essential amino acids to its host. We believe this to be the first molecular evidence of complementarity in amino acid metabolism between coral hosts and their symbionts. We successfully assembled genes originating from both the host coral and the symbiotic Symbiodinium to create a snapshot of the coral holobiont transcriptome. This dataset will facilitate a deeper understanding of molecular mechanisms of coral symbioses and stress responses.
    MeSH term(s) Animals ; Anthozoa/genetics ; Polymorphism, Genetic ; Symbiosis ; Transcriptome
    Language English
    Publishing date 2014-01-15
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0085182
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: An aposymbiotic primary coral polyp counteracts acidification by active pH regulation.

    Ohno, Yoshikazu / Iguchi, Akira / Shinzato, Chuya / Inoue, Mayuri / Suzuki, Atsushi / Sakai, Kazuhiko / Nakamura, Takashi

    Scientific reports

    2017  Volume 7, Page(s) 40324

    Abstract: Corals build their skeletons using extracellular calcifying fluid located in the tissue-skeleton interface. However, the mechanism by which corals control the transport of calcium and other ions from seawater and the mechanism of constant alkalization of ...

    Abstract Corals build their skeletons using extracellular calcifying fluid located in the tissue-skeleton interface. However, the mechanism by which corals control the transport of calcium and other ions from seawater and the mechanism of constant alkalization of calcifying fluid are largely unknown. To address these questions, we performed direct pH imaging at calcification sites (subcalicoblastic medium, SCM) to visualize active pH upregulation in live aposymbiotic primary coral polyps treated with HCl-acidified seawater. Active alkalization was observed in all individuals using vital staining method while the movement of HPTS and Alexa Fluor to SCM suggests that certain ions such as H
    MeSH term(s) Acids/metabolism ; Animals ; Anthozoa/physiology ; Glass ; Hydrogen-Ion Concentration ; Imaging, Three-Dimensional ; Osteogenesis ; Pyrenes/metabolism ; Seawater ; Sulfonic Acids/metabolism ; Symbiosis ; Up-Regulation
    Chemical Substances 8-hydroxy-1,3,6-pyrenetrisulfonic acid ; Acids ; Pyrenes ; Sulfonic Acids
    Language English
    Publishing date 2017-01-18
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/srep40324
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  5. Article: Anthropogenic lead inputs to the western Pacific during the 20th century.

    Inoue, Mayuri / Tanimizu, Masaharu

    The Science of the total environment

    2008  Volume 406, Issue 1-2, Page(s) 123–130

    Abstract: Unlike in the North Atlantic, no continuous record of anthropogenic lead (Pb) has been available in the western Pacific. We reconstructed historical changes in anthropogenic Pb on the basis of Pb isotope ratios recorded in annually-banded coral retrieved ...

    Abstract Unlike in the North Atlantic, no continuous record of anthropogenic lead (Pb) has been available in the western Pacific. We reconstructed historical changes in anthropogenic Pb on the basis of Pb isotope ratios recorded in annually-banded coral retrieved from Ogasawara Island, Japan. Whereas the predominant natural source of Pb to the surface of the western Pacific apparently is Chinese loess, anthropogenic Pb has affected the western Pacific at least since the late 19th century. From the late 19th to the early 20th century, Australian Pb used in Japan was an important source of anthropogenic Pb. During 1920-1940, Pb emitted from parts of the world other than Japan contributed somewhat to the western Pacific, and the amount of Pb imported from Australia declined. Alkyl Pb used in Japan became the main source from 1950 until the mid-1970s, when leaded gasoline began to be regulated in Japan. Since the mid-1980s, aerosols from China have been the predominant source of Pb in the western Pacific. During the 1990s, around 60% of Pb in the surface of the western Pacific was from Chinese aerosols. We also investigated the present spatial distribution and likely sources of Pb in the western Pacific by using coral samples. Enrichment in 208Pb, which is a characteristic of Pb from China, was found in all coral samples except that from Pohnpei, Micronesia, suggesting that at present anthropogenic Pb is transported to the western Pacific mainly from China via westerly winds.
    MeSH term(s) Animals ; Anthozoa/chemistry ; Australia ; China ; Environmental Monitoring ; Geography ; History, 20th Century ; Human Activities ; Japan ; Lead/analysis ; Lead/history ; Lead Radioisotopes/analysis ; Lead Radioisotopes/history ; Micronesia ; Mining ; Oceans and Seas ; Time Factors ; Water Pollutants, Chemical/analysis ; Water Pollutants, Chemical/history
    Chemical Substances Lead Radioisotopes ; Water Pollutants, Chemical ; Lead (2P299V784P)
    Language English
    Publishing date 2008-11-15
    Publishing country Netherlands
    Document type Historical Article ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2008.07.032
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  6. Article: Anthropogenic lead inputs to the western Pacific during the 20th century

    Inoue, Mayuri / Tanimizu, Masaharu

    Science of the total environment. 2008 Nov. 15, v. 406, no. 1-2

    2008  

    Abstract: Unlike in the North Atlantic, no continuous record of anthropogenic lead (Pb) has been available in the western Pacific. We reconstructed historical changes in anthropogenic Pb on the basis of Pb isotope ratios recorded in annually-banded coral retrieved ...

    Abstract Unlike in the North Atlantic, no continuous record of anthropogenic lead (Pb) has been available in the western Pacific. We reconstructed historical changes in anthropogenic Pb on the basis of Pb isotope ratios recorded in annually-banded coral retrieved from Ogasawara Island, Japan. Whereas the predominant natural source of Pb to the surface of the western Pacific apparently is Chinese loess, anthropogenic Pb has affected the western Pacific at least since the late 19th century. From the late 19th to the early 20th century, Australian Pb used in Japan was an important source of anthropogenic Pb. During 1920-1940, Pb emitted from parts of the world other than Japan contributed somewhat to the western Pacific, and the amount of Pb imported from Australia declined. Alkyl Pb used in Japan became the main source from 1950 until the mid-1970s, when leaded gasoline began to be regulated in Japan. Since the mid-1980s, aerosols from China have been the predominant source of Pb in the western Pacific. During the 1990s, around 60% of Pb in the surface of the western Pacific was from Chinese aerosols. We also investigated the present spatial distribution and likely sources of Pb in the western Pacific by using coral samples. Enrichment in ²⁰⁸Pb, which is a characteristic of Pb from China, was found in all coral samples except that from Pohnpei, Micronesia, suggesting that at present anthropogenic Pb is transported to the western Pacific mainly from China via westerly winds.
    Keywords lead ; pollution ; corals ; geographical distribution ; anthropogenic activities ; temporal variation ; history ; Pacific Ocean ; China ; Japan
    Language English
    Dates of publication 2008-1115
    Size p. 123-130.
    Publishing place [Amsterdam; New York]: Elsevier Science
    Document type Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2008.07.032
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  7. Article ; Online: Calcification process dynamics in coral primary polyps as observed using a calcein incubation method.

    Ohno, Yoshikazu / Iguchi, Akira / Shinzato, Chuya / Gushi, Mikako / Inoue, Mayuri / Suzuki, Atsushi / Sakai, Kazuhiko / Nakamura, Takashi

    Biochemistry and biophysics reports

    2017  Volume 9, Page(s) 289–294

    Abstract: Calcification processes are largely unknown in scleractinian corals. In this study, live confocal imaging was used to elucidate the spatiotemporal dynamics of the calcification process in aposymbiotic primary polyps of the coral ... ...

    Abstract Calcification processes are largely unknown in scleractinian corals. In this study, live confocal imaging was used to elucidate the spatiotemporal dynamics of the calcification process in aposymbiotic primary polyps of the coral species
    Language English
    Publishing date 2017-01-24
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2831046-9
    ISSN 2405-5808 ; 2405-5808
    ISSN (online) 2405-5808
    ISSN 2405-5808
    DOI 10.1016/j.bbrep.2017.01.006
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  8. Article: Effects of acidified seawater on coral calcification and symbiotic algae on the massive coral Porites australiensis

    Iguchi, Akira / Ozaki, Saori / Nakamura, Takashi / Inoue, Mayuri / Tanaka, Yasuaki / Suzuki, Atsushi / Kawahata, Hodaka / Sakai, Kazuhiko

    Marine environmental research. 2012 Feb., v. 73

    2012  

    Abstract: We investigated the effect of acidified seawater on calcification and symbiotic algae (zooxanthellae density, chlorophyll content per single algal cell, fluorescence yield (Fv/Fm)) on a massive coral, Porites australiensis, a common species in the Ryukyu ...

    Abstract We investigated the effect of acidified seawater on calcification and symbiotic algae (zooxanthellae density, chlorophyll content per single algal cell, fluorescence yield (Fv/Fm)) on a massive coral, Porites australiensis, a common species in the Ryukyu Archipelago of Japan. We found that acidified seawater significantly decreased the calcification and fluorescence yield, but did not affect zooxanthellae density and chlorophyll content per single algal cell. This indicates low levels of photoacclimation to acidified seawater in this species, and this is contrary to the findings of previous studies of Acropora species. A significant correlation between calcification and fluorescence yield was observed, indicating the presence of a strong relationship between calcification and algal photosynthesis. Our results indicate that endosymbiont photosynthetic dysfunction may enhance the decrease of coral calcification in future acidified ocean conditions. Calcification and fluorescence yield among colonies clearly differed, showing that the response to acidified seawater is highly variable among colonies in natural coral populations.
    Keywords Acropora ; Algae ; calcification ; chlorophyll ; corals ; fluorescence ; photosynthesis ; seawater ; Japan ; Ryukyu Archipelago
    Language English
    Dates of publication 2012-02
    Size p. 32-36.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1502505-6
    ISSN 1879-0291 ; 0141-1136
    ISSN (online) 1879-0291
    ISSN 0141-1136
    DOI 10.1016/j.marenvres.2011.10.008
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  9. Article ; Online: Mg isotope fractionation in biogenic carbonates of deep-sea coral, benthic foraminifera, and hermatypic coral.

    Yoshimura, Toshihiro / Tanimizu, Masaharu / Inoue, Mayuri / Suzuki, Atsushi / Iwasaki, Nozomu / Kawahata, Hodaka

    Analytical and bioanalytical chemistry

    2011  Volume 401, Issue 9, Page(s) 2755–2769

    Abstract: High-precision Mg isotope measurements by multiple collector inductively coupled plasma mass spectrometry were applied for determinations of magnesium isotopic fractionation of biogenic calcium carbonates from seawater with a rapid Mg purification ... ...

    Abstract High-precision Mg isotope measurements by multiple collector inductively coupled plasma mass spectrometry were applied for determinations of magnesium isotopic fractionation of biogenic calcium carbonates from seawater with a rapid Mg purification technique. The mean δ(26)Mg values of scleractinian corals, giant clam, benthic foraminifera, and calcite deep-sea corals were -0.87‰, -2.57‰, -2.34‰, and -2.43‰, suggesting preferential precipitation of light Mg isotopes to produce carbonate skeleton in biomineralization. Mg isotope fractionation in deep-sea coral, which has high Mg calcite skeleton, showed a clear temperature (T) dependence from 2.5 °C to 19.5 °C: 1,000 × ln(α) = -2.63 (±0.076) + 0.0138 (±0.0051) × T(R(2) = 0.82, p < 0.01). The δ(26)Mg values of large benthic foraminifera, which are also composed of a high-Mg calcite skeleton, can be plotted on the same regression line as that for deep-sea coral. Since the precipitation rates of deep-sea coral and benthic foraminifera are several orders of magnitude different, the results suggest that kinetic isotope fractionation may not be a major controlling factor for high-Mg calcite. The Mg isotope fractionation factors and the slope of temperature dependence from deep-sea corals and benthic foraminifera are similar to that for an inorganically precipitated calcite speleothem. Taking into account element partitioning and the calcification rate of biogenic CaCO(3), the similarity among inorganic minerals, deep-sea corals, and benthic foraminiferas may indicate a strong mineralogical control on Mg isotope fractionation for high-Mg calcite. On the other hand, δ(26)Mg in hermatypic corals composed of aragonite has been comparable with previous data on biogenic aragonite of coral, sclerosponges, and scaphopad, regardless of species differences of samples.
    MeSH term(s) Animals ; Anthozoa/chemistry ; Anthozoa/classification ; Aquatic Organisms/chemistry ; Calcification, Physiologic ; Calcium Carbonate/analysis ; Chemical Fractionation/methods ; Foraminifera/chemistry ; Isotopes/analysis ; Kinetics ; Magnesium/analysis ; Mediterranean Sea ; Pacific Ocean ; Phylogeography ; Spectrophotometry, Atomic/methods ; Temperature
    Chemical Substances Isotopes ; Calcium Carbonate (H0G9379FGK) ; Magnesium (I38ZP9992A)
    Language English
    Publishing date 2011-11
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 201093-8
    ISSN 1618-2650 ; 0016-1152 ; 0372-7920
    ISSN (online) 1618-2650
    ISSN 0016-1152 ; 0372-7920
    DOI 10.1007/s00216-011-5264-0
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  10. Article: Endocrine disrupter nonylphenol and bisphenol A contamination in Okinawa and Ishigaki Islands, Japan--within coral reefs and adjacent river mouths.

    Kawahata, Hodaka / Ohta, Hidekazu / Inoue, Mayuri / Suzuki, Atsushi

    Chemosphere

    2004  Volume 55, Issue 11, Page(s) 1519–1527

    Abstract: Certain chemicals possess the potential to modulate endocrine systems, and thereby interfere with reproduction and developmental processes in the wild. We analyzed endocrine disrupters nonylphenol (NP) and bisphenol A (BPA) levels at various sites in ... ...

    Abstract Certain chemicals possess the potential to modulate endocrine systems, and thereby interfere with reproduction and developmental processes in the wild. We analyzed endocrine disrupters nonylphenol (NP) and bisphenol A (BPA) levels at various sites in Okinawa and Ishigaki Islands, Japan. River-water samples showed undetectable to low concentrations of NP and BPA at most of the sites investigated. However, an appreciable amount of BPA was detected in sediments at one coral reef site. In addition, significant numbers of river sediment samples showed appreciable amounts of NP and BPA. Most of the sampling sites for this study are located within a distance of 1 km from the coral reefs, which are under influence of river-waters to a variable extent. Therefore, influence of endocrine disrupters may have already begun on adjacent coral reefs. Both endocrine disrupters were positively correlated with human population densities, but not with the contents of red soil generated by farm land reformation. Therefore, it is concluded that NP and BPA pollution is a consequence of human waste discharge, both domestic and industrial, and not by agricultural activities.
    MeSH term(s) Animals ; Anthozoa ; Benzhydryl Compounds ; Gas Chromatography-Mass Spectrometry ; Geography ; Geologic Sediments/analysis ; Humans ; Japan ; Phenols/analysis ; Population Density ; Rivers/chemistry ; Water Pollutants, Chemical/analysis
    Chemical Substances Benzhydryl Compounds ; Phenols ; Water Pollutants, Chemical ; nonylphenol (79F6A2ILP5) ; bisphenol A (MLT3645I99)
    Language English
    Publishing date 2004-06
    Publishing country England
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2004.01.032
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