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Solving the mystery of centromere evolution

Research Project

Project/Area Number 19H03207
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 43050:Genome biology-related
Research InstitutionThe Graduate University for Advanced Studies

Principal Investigator

Innan Hideki  総合研究大学院大学, 統合進化科学研究センター, 教授 (90444140)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2019: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Keywordscentromere / evolution / population genetics / theory / ゲノム進化 / セントロメア / 集団遺伝 / 反復配列 / 集団遺伝学 / 理論 / ゲノムデータ / 進化
Outline of Research at the Start

セントロメアは、重要な機能を持つにもかかわらず、非常に速いスピードで進化している。これは、「保守的な機能をコードする領域は、機能的制約の強さから進化的制約を受ける(ゆっくり進化する)」という、進化の大原則に反する。そこには必ず理由があるはずで、それを解き明かしたいと思っている。セントロメアの機能を守りつつも、何か他の進化的な力が働いていると仮説をたて、それを最近急速に蓄積されたデータを用いて検証する。

Outline of Final Research Achievements

We analyzed polymorphism in the human centromeric regions. The data were obtained from public database. Each centromeric region contains highly repetitive region of 171bp of alpha-satellites, flanked by pericentromeric regions where a number of old alpha-satellites locate. We found that the human population has a marked amount of DNA variation in the centromeric regions, including copy number variation and DNA sequence variation within alpha-satellites. An obvious trend is that alpha-satellites that locate more closely are more similar to each other. Our theoretical analysis demonstrated crucial roles of two important mechanisms, one is gene conversion and unequal crossing over that homogenize genetic variation between alpha-satellites and selection to maintain functional (sequence) uniformity of alpha-satellites on the same chromosome.

Academic Significance and Societal Importance of the Research Achievements

セントロメアは細胞分裂における最も重要な機能のひとつであるが、その進化には謎が多い。重要な機能は基本的には制約が強く進化のスピードが遅いのであるが、セントロメアは例外的に早い進化をしている。なぜセントロメアが例外的な進化をしているかを理論的に解析した。分子生物学でもよく研究対象とされるセントロメアに対して、進化的視点からの理解を加えることは、学問の進展繋がると考える。

Report

(4 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (11 results)

All 2022 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (9 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 8 results,  Open Access: 1 results)

  • [Int'l Joint Research] Harvard University(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Universite Paris Diderot(フランス)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Muller’s ratchet of the Y chromosome with gene conversion2022

    • Author(s)
      Sakamoto Takahiro、Innan Hideki
    • Journal Title

      Genetics

      Volume: 220 Issue: 1 Pages: 1-12

    • DOI

      10.1093/genetics/iyab204

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Frequent somatic gene conversion as a mechanism for loss of heterozygosity in tumor suppressor genes.2022

    • Author(s)
      Takahashi KK, Innan H
    • Journal Title

      Genome Res.

      Volume: 32 Issue: 6 Pages: 1017-1025

    • DOI

      10.1101/gr.276617.122

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Frequently functional innovation through gene duplication followed by frameshift mutation.2022

    • Author(s)
      Guo B, Zou M, Sakamoto T, Innan H
    • Journal Title

      Genes

      Volume: 13 Issue: 2 Pages: 190-190

    • DOI

      10.3390/genes13020190

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Duplication with structural modification through extrachromosomal circular and lariat DNA in the human genome2020

    • Author(s)
      Takahashi, K., and H. Innan
    • Journal Title

      Sci. Rep

      Volume: 10 Issue: 1 Pages: 7150-7150

    • DOI

      10.1038/s41598-020-63665-6

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Muller’s ratchet and aging2020

    • Author(s)
      Govindaraju, D. R., H. Innan, and R. A. Veitia
    • Journal Title

      Trends in Genet.

      Volume: 36 Issue: 6 Pages: 395-402

    • DOI

      10.1016/j.tig.2020.02.004

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Genetic and epigenetic Muller’s ratchet as a mechanism of frailty and morbidity during aging: a demographic genetic model2020

    • Author(s)
      Innan, H., V. Reiner and D. Govindaraju
    • Journal Title

      Hum. Genet.

      Volume: 139 Issue: 3 Pages: 409-420

    • DOI

      10.1007/s00439-019-02067-9

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mutation Load and Aging2020

    • Author(s)
      Govindaraju Diddahally、Innan Hideki
    • Journal Title

      Encyclopedia of Gerontology and Population Aging

      Volume: - Pages: 1-6

    • DOI

      10.1007/978-3-319-69892-2_733-1

    • ISBN
      9783319698922
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Population genetics and molecular evolution of DNA sequences in transposable elements. II. Accumulation of variation and evolution of a new subfamily2019

    • Author(s)
      Iwasaki, W. M., Kijima and H. Innan
    • Journal Title

      Mol. Biol. Evol.

      Volume: 37 Issue: 2 Pages: 355-364

    • DOI

      10.1093/molbev/msz220

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The role gene conversion between transposable elements in rewiring regulatory networks.2019

    • Author(s)
      Fawcett, J. A., and H. Innan
    • Journal Title

      Genome Biol. Evol.

      Volume: 11 Issue: 7 Pages: 1723-1729

    • DOI

      10.1093/gbe/evz124

    • Related Report
      2019 Annual Research Report

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

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