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Affiliated academic organizations 【 display / non-display 】

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Research Interests 【 display / non-display 】

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Research Areas 【 display / non-display 】

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Research Theme 【 display / non-display 】

Research Theme 【 display / non-display 】

• Comparative morphology of integumentary structures in tunicate

• Algal symbiosis in marine invertebrates

• Tunic morphology and functions

• Ascidian-cyanobacteria symbiosis system

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• Butterfly pupal wing tissue with an eyespot organizer

  Joji M. Otaki, Atsuko Tanaka, Euichi Hirose

  Cells & Development ( Elsevier BV )    203992 - 203992   2025.01 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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    DOI

• Ascidian larvae discriminate nano-scale difference in surface structures during substrate selection for settlement

  Daisuke Sakai, Noburu Sensui, Euichi Hirose

  Zoological Science ( Zoological Society of Japan )  41 ( 6 ) 564 - 569   2024.11 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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    DOI

• Regeneration of tunic cuticle is suppressed in edible ascidian Halocynthia roretzi contracting soft tunic syndrome

  K Nakayama, Y Obayashi, L Munechika, SI Kitamura, T Yanagida, M Honjo, S Murakami, E Hirose

  Diseases of Aquatic Organisms ( Inter-Research Science Center )  159   37 - 48   2024.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  Soft tunic syndrome is an infectious disease caused by the flagellate Azumiobodo hoyamushi, which severely damages the aquaculture of the edible ascidian Halocynthia roretzi. Tunic is a cellulosic extracellular matrix entirely covering the body in ascidians and other tunicates, and its dense cuticle layer covers the tunic surface as a physical barrier against microorganisms. When the tunic of intact H. roretzi individuals was cut into strips, electron-dense fibers (DFs) appeared on the cut surface of the tunic matrix and aggregated to regenerate a new cuticular layer in seawater within a few days. DF formation was partially or completely inhibited in individuals with soft tunic syndrome, and DF formation was also inhibited by the presence of some proteases, indicating the involvement of proteolysis in the process of tunic softening as well as cuticle regeneration. Using pure cultures of the causative flagellate A. hoyamushi, the expression of protease genes and secretion of some proteases were confirmed by RNA-seq analysis and a 4-methylcoumaryl-7-amide substrate assay. Some of these proteases may degrade proteins in the tunic matrix. These findings suggest that the proteases of A. hoyamushi is the key to understanding the mechanisms of cuticular regeneration inhibition and tunic softening.

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• Optical properties of body mucus secreted from the coral reef sea slugs: Measurement of refractive indices and relative absorption spectra

  Ryogo Takano, Euchi Hirose

  Zoological Studies   23 ( 2 ) 1 - 10   2024.03 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Fine structures along the alimentary canal in a holoplanktonic gastropod, <i>Pterotrachea coronata</i>

  Jun Nishikawa, Euichi Hirose

  Plankton and Benthos Research ( The Plankton Society of Japan/The Japanese Association of Benthology )  18 ( 4 ) 198 - 205   2023.11 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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Other Papers 【 display / non-display 】

Other Papers 【 display / non-display 】

• Innate immunity in the edible ascidian Halocynthia roretzi developing soft tunic syndrome

  柳田哲矢, 仲山慶, 澤田知夫, 本庄美穂, 村上祥子, 飯田貴次, 広瀬裕一, 北村真一

  日本寄生虫学会大会プログラム・抄録集   92nd   2023

   

  J-GLOBAL

• What are the benefits in the ascidian-Prochloron symbiosis?

  その他の著者

  Endocytobiosis and Cell Research ( その他の出版社 )  15   51 - 62   2004

   

• Colonial allorecognition, hemolytic rejection, and viviparity in botryllid ascidians.

  E. Hirose

  Zoological Science ( 日本動物学会 )    2003.03

   

• Recent advances in molecular biology on pigmentation of the medaka, Oryzias latipes.

  J. Matsumoto, H. Ono, and E. Hirose

  The Fish Biology Journal MEDAKA ( The Fish Biology Journal MEDAKA )    1996.11

   

• Allorecognition in compound ascidians.

  Y. Saito, E. Hirose, H. Watanabe

  International Journal of Developmental Biology ( International Journal of Developmental Biology )    1994.05

   

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Academic Awards 【 display / non-display 】

Academic Awards 【 display / non-display 】

• Zoological Science Award

  2016.11.17   Zoological Society of Japan   Fine structure of the integumentary cuticles and alimentary tissue of pycnophyid kinorhynchs Pycnophyes oshoroensis and Kinorhynchus yushini (Kinorhyncha, Homalorhagida)

  Winner: Euichi Hirose, Hiroshi Yamasaki

Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Comprehensive analysis of optical properties and evolutionary and diversification processes in the body surface of gelatinous zooplankton

  Grant-in-Aid for Scientific Research(B)

  Project Year: 2023.04  -  2028.03 

  Direct: 11,300,000 (YEN)  Overheads: 14,690,000 (YEN)  Total: 3,390,000 (YEN)

• Comprehensive analysis of optical properties in the body surface of gelatinous zoolankton and their evolutionary and diversification processes

  Grant-in-Aid for Scientific Research(B)

  Project Year: 2023.04  -  2028.03 

  Direct: 11,300,000 (YEN)  Overheads: 14,690,000 (YEN)  Total: 3,390,000 (YEN)

• The pathogenic flagellate Azumiobodo hoyamushi versus host ascidian immune system

  Grant-in-Aid for Scientific Research(B)

  Project Year: 2023.04  -  2026.03 

  Direct: 14,000,000 (YEN)  Overheads: 18,200,000 (YEN)  Total: 4,200,000 (YEN)

• Does nano-structures on the body surface decrease adhesive/friction forces?

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2021.04  -  2024.03 

  Direct: 3,200,000 (YEN)  Overheads: 4,160,000 (YEN)  Total: 960,000 (YEN)

• Does nano-structures on the body surface decrease adhesive/friction forces?

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2021.04  -  2024.03 

  Direct: 3,200,000 (YEN)  Overheads: 4,160,000 (YEN)  Total: 960,000 (YEN)

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Other External funds 【 display / non-display 】

Other External funds 【 display / non-display 】

• Project Year: 2010  -  2010 

  Direct: 0 (YEN)  Overheads: 0 (YEN)  Total: 0 (YEN)

• Project Year: 2007  -  2007 

  Direct: 0 (YEN)  Overheads: 0 (YEN)  Total: 0 (YEN)

• Project Year: 1992  -  1992 

  Direct: 0 (YEN)  Overheads: 0 (YEN)  Total: 0 (YEN)

SDGs 【 display / non-display 】

SDGs 【 display / non-display 】

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Social Activity 【 display / non-display 】

• 2023.09