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Investigation for genetic basis of traits that were acquired or lost in environmental bacteria to be insect intracellular symbionts

Research Project

Project/Area Number 21K14865
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 39050:Insect science-related
Research InstitutionAkita Prefectural University

Principal Investigator

Takeshita Kazutaka  秋田県立大学, 生物資源科学部, 助教 (40799194)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords細胞内共生 / カメムシ / パラバークホルデリア / 進化 / 遺伝子組換え共生細菌 / バークホルデリア
Outline of Research at the Start

昆虫細胞内共生微生物の多くが培養困難であり、遺伝子組換え技術の適用ができない。このことが、昆虫細胞内共生の分子基盤や進化プロセスの解明を阻んできた。しかし私は、一部のカメムシ類に細胞内共生する細菌が、培養可能かつ遺伝子組換え可能であることを見出した。本研究では、近縁な環境細菌(非共生細菌)との比較ゲノム解析、遺伝子組換え共生細菌の作出およびカメムシへの感染実験を実施し、カメムシへの細胞内共生を可能としている共生細菌側の責任遺伝子を同定する。

Outline of Final Research Achievements

In this study, I tried to identify the bacterial genes essential to intracellular symbiosis with the host insect via the experimental approach with genetically manipulated bacterial symbionts. By comparative genomic analysis, I extracted 136 genes as candidates. For the 20 candidates, I constructed deletion mutants of the bacterial symbiont and performed infection experiments with the host insect. However, all mutants were able to establish the normal symbiotic association with the host. Therefore, I concluded these 20 genes are not involved in intracellular symbiosis and will continue to examine the remaining candidates.

Academic Significance and Societal Importance of the Research Achievements

本研究では細胞内共生に関わる細菌側責任遺伝子の同定には至らなかったものの、候補遺伝子のリストアップは完了した。これらの中には責任遺伝子だけでなく、共生系の進化において重要な役割を果たした遺伝子も含まれているはずであり、そのような候補を絞り込めた点で重要な成果と言える。残りの候補遺伝子を対象に引き続き検証実験を行い、昆虫細胞内共生の分子基盤や進化プロセスの解明に繋げたい。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (6 results)

All 2024 2023 2022 Other

All Presentation (4 results) (of which Int'l Joint Research: 1 results) Remarks (2 results)

  • [Presentation] 昆虫との細胞内共生に必須な共生細菌遺伝子の探索2024

    • Author(s)
      竹下和貴
    • Organizer
      日本昆虫学会第84回大会 第68回日本応用動物昆虫学会大会 合同大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 昆虫細胞内共生系における共生細菌側責任遺伝子の探索2023

    • Author(s)
      竹下和貴
    • Organizer
      日本微生物生態学会第36回大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 昆虫との細胞内共生を可能にする細菌側責任遺伝子の探索2023

    • Author(s)
      竹下和貴,近藤美洋,菊池義智
    • Organizer
      第67回日本応用動物昆虫学会大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Obligate gut symbiosis with environmentally-acquired Paraburkholderia in a stink bug, Physopelta gutta (Pyrrhocoroidea: Largidae)2022

    • Author(s)
      Kazutaka Takeshita & Yoshitomo Kikuchi
    • Organizer
      18th International Symposium on Microbial Ecology (ISME18)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Remarks] Kazutaka Takeshita Website

    • URL

      https://sites.google.com/view/kazutakatakeshita/home

    • Related Report
      2023 Annual Research Report
  • [Remarks] KAZUTAKA TAKESHITA WEBSITE

    • URL

      https://sites.google.com/view/kazutakatakeshita/home

    • Related Report
      2022 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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