• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Towards the elucidation of factors affecting the reproductive modes of the planarian Dugesia ryukyuensis.

Research Project

Project/Area Number 19K16175
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 44040:Morphology and anatomical structure-related
Research InstitutionKeio University (2021-2022)
Hirosaki University (2019-2020)

Principal Investigator

SEKII Kiyono  慶應義塾大学, 商学部(日吉), 助教 (50786358)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsプラナリア / 生殖様式 / 共生細菌
Outline of Research at the Start

扁形動物プラナリアには、無性生殖と有性生殖を使い分けるものがいる。この生殖様式の転換を可能にしているのが、プラナリアが全身に有する分化多能性幹細胞であり、ここから生殖細胞を含めたすべての組織を形成できる。しかし無性個体は分裂後、脳も含めてすべて再生するのに、生殖細胞・器官だけは作らず、無性状態を維持し続ける。このプラナリアが無性状態のままでいる仕組みに、最近、共生細菌が関与している可能性が示された。本研究では、この宿主であるプラナリアの無性状態に関与する細菌の存在・機能を明らかにする。

Outline of Final Research Achievements

Some flatworms can reproduce both asexually and sexually, and switch their reproductive modes based on environmental changes, life cycle stages, or both. However, the mechanisms by which they switch between asexual and sexual reproductive modes are not well understood.
In the planarian Dugesia ryukyuensis, an experimental system has been established to convert asexually reproducing worms into sexual worms (sexualization), by feeding them sexually mature planarians. This feeding assay system enables us to study the factor that suppresses germ cell differentiation and keeps planarians in an asexual state. In the current study, I investigated the factors involved in the mechanism that maintains the asexual state, by using the feeding assay system, fluorescence in situ hybridization, and genomic analysis.

Academic Significance and Societal Importance of the Research Achievements

ボルバキアのように、宿主のオスとメスの比を自分の都合良く操作する共生細菌の存在はすでに知られているが、無性・有性という宿主の生殖様式を変えられる共生細菌の存在はこれまでまだ報告がない。受精卵を経て次世代をのこす有性生殖にくらべ、分裂・再生によって数を増やすプラナリアの無性生殖は共生細菌の増殖にとっても有利となり、そのように自分の利益のために宿主の生殖様式を操作する共生細菌は興味深い報告となる。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (13 results)

All 2023 2022 2021 2020 2019

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 4 results) Presentation (7 results)

  • [Journal Article] Sex-inducing effects toward planarians widely present among parasitic flatworms2023

    • Author(s)
      Sekii Kiyono et al. Ichikawa-Seki Madoka、Kobayashi Kazuya
    • Journal Title

      iScience

      Volume: 26 Issue: 1 Pages: 105776-105776

    • DOI

      10.1016/j.isci.2022.105776

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Identification of novel yolk ferritins unique to planarians: planarians supply aluminum rather than iron to vitellaria in egg capsules2021

    • Author(s)
      Kawase Osamu、Iwaya Hisashi、Asano Yoshiya、Inoue Hiromoto、Kudo Seiya、Sasahira Motoki、Azuma Nobuyuki、Kondoh Daisuke、Ichikawa-Seki Madoka、Xuan Xuenan、Sakamoto Kimitoshi、Okamoto Hikaru、Nakadate Hinaki、Inoue Wataru、Saito Ikuma、Narita Miyu、Sekii Kiyono、Kobayashi Kazuya
    • Journal Title

      Cell and Tissue Research

      Volume: 386 Issue: 2 Pages: 391-413

    • DOI

      10.1007/s00441-021-03506-8

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Sex-Inducing Activities of the Land Planarian Bipalium nobile Extract Fractions, Obtained Using Bioassay-Guided Fractionation, in the Freshwater Planarian Dugesia ryukyuensis2021

    • Author(s)
      Makoto Kitamura, Hiroyuki Tanaka, Yurie Horiguchi, Sayaka Manta, Ikuma Saito, Hisashi Iwaya, Hikaru Okamoto, Nanna Nagao, Yumi Yanagihara, Yu Taguchi, Rei Tezuka, Takanobu Maezawa, Kiyono Sekii, Kazuya Kobayashi
    • Journal Title

      Zoological science

      Volume: 38 Issue: 6 Pages: 544-557

    • DOI

      10.2108/zs210029

    • NAID

      210000167061

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] D-Tryptophan enhances the reproductive organ-specific expression of the amino acid transporter homolog Dr-SLC38A9 involved in the sexual induction of planarian Dugesia ryukyuensis2021

    • Author(s)
      Takanobu Maezawa, Masaki Ishikawa, Kiyono Sekii, Go Nagamatsu, Ryohei Furukawa, Kazuya Kobayashi
    • Journal Title

      Zoological Letters

      Volume: 7 Issue: 1 Pages: 4-4

    • DOI

      10.1186/s40851-021-00173-z

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sex-Inducing Substances Terminate Dormancy in Planarian Postembryonic Reproductive Development2020

    • Author(s)
      Sekii Kiyono、Kobayashi Kazuya
    • Journal Title

      In book: Advances in Invertebrate (Neuro) Endocrinology.

      Volume: 1 Pages: 25-62

    • DOI

      10.1201/9781003029854-2

    • ISBN
      9781003029854
    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Transcriptomic analysis reveals differences in the regulation of amino acid metabolism in asexual and sexual planarians2019

    • Author(s)
      Sekii Kiyono, Yorimoto Shunta, Okamoto Hikaru, Nagao Nanna, Maezawa Takanobu, Matsui Yasuhisa, Yamaguchi Katsushi, Furukawa Ryohei, Shigenobu Shuji, Kobayashi Kazuya
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 6132-6132

    • DOI

      10.1038/s41598-019-42025-z

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 扁形動物に広く保存されたプラナリアの有性化因子の抽出・精製方法について2022

    • Author(s)
      渡邊太朗・伊藤陸・山口健太朗・池内葵・北村誠・関井清乃・関まどか・坂元君年・小林一也
    • Organizer
      日本動物学会第93回大会,早稲田.
    • Related Report
      2022 Annual Research Report
  • [Presentation] プラナリア有性化に必須な核内受容体遺伝子は吸虫カンテツの生殖様式転換に関与するか?2022

    • Author(s)
      田島玲音・黒田道夫・萬田冴佳・池内葵・北島ちひろ・熊谷信是・関井清乃・関まどか・小林一也
    • Organizer
      日本動物学会第93回大会,早稲田.
    • Related Report
      2022 Annual Research Report
  • [Presentation] プラナリアの卵カプセルに蓄積しているアルミニウムと卵黄フェリチンの関係2022

    • Author(s)
      川瀬摂・岩谷尚・浅野義哉・井上博元・工藤誠也・笹平素生・東信行・近藤大輔・関まどか・玄学南・坂元君年・岡本光・中舘雛姫・井上航・齋藤伊玖真・成田美優・関井清乃・小林一也
    • Organizer
      令和4年度日本動物学会東北支部大会, 弘前
    • Related Report
      2022 Annual Research Report
  • [Presentation] プラナリア有性化因子合成酵素の単離を目指して2019

    • Author(s)
      齋藤伊玖真・齋藤由梨亜・関井清乃・古川亮平・小柳亮・佐藤矩行・小林一也
    • Organizer
      日本動物学会 令和元年度東北支部大会
    • Related Report
      2019 Research-status Report
  • [Presentation] プラナリア有性化因子の給餌刺激で発現が誘導される遺伝子について2019

    • Author(s)
      黒田道生・成田美優・萬田冴佳・頼本隼汰・山口勝司・重信秀治・古川亮平・関井清乃・小林一也
    • Organizer
      日本動物学会第90回大会
    • Related Report
      2019 Research-status Report
  • [Presentation] プラナリア有性化におけるアミノ酸の役割2019

    • Author(s)
      清水辰海・江口碧唯・石川正樹・関井清乃・古川亮平・小林一也・石田哲夫・前澤孝信
    • Organizer
      日本動物学会第90回大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 芳香族アミノ酸水酸化酵素遺伝子の解析:プラナリアの有性化の観点から2019

    • Author(s)
      成田美優・長尾南林・関井清乃・石田哲夫・前澤孝信・小林一也
    • Organizer
      日本動物学会 令和元年度東北支部大会
    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2024-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi