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Vertical transfer of symbiotic algae in Acoela: How far has the integrity between host and symbiotic algae evolved?

Research Project

Project/Area Number 17K07535
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Biodiversity/Systematics
Research InstitutionHiroshima University

Principal Investigator

Hikosaka Akira  広島大学, 統合生命科学研究科(総), 准教授 (30263635)

Co-Investigator(Kenkyū-buntansha) 田川 訓史  広島大学, 統合生命科学研究科(理), 准教授 (00403577)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords無腸動物 / 共生 / 進化 / ゲノム / 藻類 / 垂直伝搬 / 褐虫藻
Outline of Final Research Achievements

Many Acoela species have symbiotic microalgae in their bodies. While most of them take up symbiotic algae during larval stages (horizontal transmission), in some Acoela species, parents pass symbiotic algae to their offspring (vertical transmission). The latter has evolved into a deeper host-symbiont dependency. This study investigates the extent to which this integrity is deepened. We obtained the following results. (1) We analyzed the genome of an Acoela species, Praesagittifera naikaiensis (horizontal transmission type). (2) Cultivation of two symbionts of Waminoa (vertical transmission type) and the symbiont of Heterochaerus (horizontal transmission type) suggested that the former symbiotic algae have a reduced ability of free-living.

Academic Significance and Societal Importance of the Research Achievements

無腸動物は動物の初期進化を解明する上で重要な位置付けにいる動物であり、また動物と藻類の共生進化を解明する上でも重要な動物である。その一種であるナイカイムチョウウズムシのゲノムを明らかにしたことは、無腸動物の研究を進める基盤となるという意味で学術的な意義がある。また、垂直伝搬型のワミノア由来の共生藻の培養が困難であるという結果は、この種と共生藻の依存関係がより深化していることを示唆しており、水平伝搬から垂直伝搬へという、共生関係の進化における重要な契機を理解するための端緒となる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (8 results)

All 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (5 results)

  • [Journal Article] Geographical distribution and genetic diversity of Praesagittifera naikaiensis (Acoelomorpha) in the Seto Inland Sea, Japan2020

    • Author(s)
      Hikosaka-Katayama T, Watanuki N, Niiho S, Hikosaka A
    • Journal Title

      Zoological Science

      Volume: -

    • NAID

      40022330964

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Xenacoelomorph-specific Hox peptides: Insights into the phylogeny of acoels, nemertodermatids, and xenoturbellids.2019

    • Author(s)
      T. Ueki, A. Arimoto, K. Tagawa, N. Satoh.
    • Journal Title

      Zoological Science

      Volume: 36 Issue: 5 Pages: 395-404

    • DOI

      10.2108/zs190045

    • NAID

      210000182863

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A draft nuclear-genome assembly of the acoel flatworm Praesagittifera naikaiensis2019

    • Author(s)
      Arimoto Asuka、Hikosaka-Katayama Tomoe、Hikosaka Akira、Tagawa Kuni、Inoue Toyoshige、Ueki Tatsuya、Yoshida Masa-aki、Kanda Miyuki、Shoguchi Eiichi、Hisata Kanako、Satoh Noriyuki
    • Journal Title

      GigaScience

      Volume: 8 Issue: 4 Pages: 1-8

    • DOI

      10.1093/gigascience/giz023

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 瀬戸内海産無腸動物ナイカイムチョウウズムシの浸透圧適応2020

    • Author(s)
      平野絢香, 彦坂智恵, 彦坂暁
    • Organizer
      日本動物学会広島県例会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 瀬戸内海の2種の無腸動物とその共生藻2019

    • Author(s)
      綿貫七海, 新保早, 岡部楓, 松浦綾音, 彦坂智恵, 彦坂暁
    • Organizer
      生物系三学会中国四国支部大会(広島)
    • Related Report
      2019 Annual Research Report
  • [Presentation] 無腸動物(Praesagittifera naikaiensis)からの酸感受性チャネルのクローニング2019

    • Author(s)
      亀川礼記, 彦坂暁, 古川康雄
    • Organizer
      生物系三学会中国四国支部大会(広島)
    • Related Report
      2019 Annual Research Report
  • [Presentation] 瀬戸内海の無腸動物とその共生藻の分布と遺伝的分化2019

    • Author(s)
      彦坂暁, 綿貫七海, 松浦綾音, 岡部楓, 新保早, 彦坂智恵
    • Organizer
      日本動物学会第90回大会(大阪)
    • Related Report
      2019 Annual Research Report
  • [Presentation] ナイカイムチョウウズムシPraesagittifera naikaiensisの共生藻は何か?2019

    • Author(s)
      竹歳桃芳, 彦坂智恵, 彦坂 暁, 石田 健一郎
    • Organizer
      日本共生生物学会第3回大会(横浜)
    • Related Report
      2019 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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