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Population genomics of western Pacific abalones

Research Project

Project/Area Number 17K19280
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Forestry and Forest Products Science, Applied aquatic science, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Hirase Shotaro  東京大学, 大学院農学生命科学研究科(農学部), 助教 (90635559)

Co-Investigator(Kenkyū-buntansha) 關野 正志  国立研究開発法人水産研究・教育機構, 中央水産研究所, グループ長 (90371799)
Project Period (FY) 2017-06-30 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywordsアワビ / 種分化 / 集団ゲノミクス / ゲノムシーケンス / GRAS-Di / 保全 / 生殖隔離 / 大型アワビ類 / 交雑 / 集団動態モデリング / 集団遺伝 / コピー数多型 / 日本列島 / SNP / GRAD-Di / 全ゲノム解析 / 集団ゲノミクス解析 / 次世代シーケンサー / 近縁種群 / 交雑帯
Outline of Final Research Achievements

A species complex of western Pacific abalones is classified into three putative species including two subspecies: H. discus discus (Kuro), H. d. hannai (Ezo), H. madaka (Madaka), and H. gigantia (Megai), and the Kuro, Madaka, and Megai show same distribution. Morphological and ecological characteristics suggested that Kuro/Ezo, Madaka, and Megai are distinct species, respectively, but they are genetically close and can produce viable F1 hybrids. We performed population genomic analyses for these species by whole genome resequencing and GRAS-Di. Phylogenetic and clustering analyses demonstrated clear genetic divergences among Ezo/Kuro, Madaka, Megai. Our analyses also detected allele sharing of nuclear genomes among species, and demographic modeling estimated that the evolution of their reproductive isolation has proceeded with gene flow. We identified genomic regions showing the signals of divergent selection between Ezo/Kuro and Madaka, which may be associated with speciation.

Academic Significance and Societal Importance of the Research Achievements

近縁であるにも関わらず、種の独自性を生みだしている遺伝基盤を明らかにすることは、対象となる生物種の増養殖及び保全戦略を考える上で重要であり、種分化のプロセスを考える上でも興味深い。本研究の成果は、日本の水産重要種であるエゾアワビ、クロアワビ、マダカアワビ、メガイアワビの保全方策を立案するための重要な遺伝情報を提供する。また、本研究をさらに深化させることで、海洋における種分化プロセスのモデルケースを提示できると考えている。

Report

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

    (4 results)

All 2020 2019 2018

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

  • [Presentation] 日本産大型アワビ類3種の種分化プロセスの推定と遺伝子コピー数多型の検出2020

    • Author(s)
      平瀬祥太朗, 山崎 曜, 關野正志, 池田 実, 原 素之, 菊池 潔
    • Organizer
      令和2年度 日本水産学会春季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Population genomics of Pacific abalone species complex in early phase of marine speciation2019

    • Author(s)
      Shotaro Hirase, Masashi Sekino, Minoru Ikeda, Motoyuki Hara, Kiyoshi Kikuchi
    • Organizer
      Evolution2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ゲノムワイドSNP解析による日本産大型アワビ類3種の遺伝的類縁関係2019

    • Author(s)
      平瀬祥太朗・關野正志・池田 実・原 素之・菊池 潔
    • Organizer
      平成31年度 日本水産学会春季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 主成分分析による地域適応遺伝子の探索2018

    • Author(s)
      平瀬祥太朗, 手塚 あゆみ, 永野 惇, 菊池 潔, 岩崎 渉
    • Organizer
      平成30年日本水産学会春季大会
    • Related Report
      2017 Research-status Report

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Published: 2017-07-21   Modified: 2021-02-19  

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