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Molecular mechanism of axial formation in chromosomes mediated by condensins

Research Project

Project/Area Number 16K07455
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Genetics/Chromosome dynamics
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Ono Takao  国立研究開発法人理化学研究所, 開拓研究本部, 専任研究員 (20291172)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
KeywordsコンデンシンII / 染色体軸 / クロマチン / 再組織化 / HEATリピート / 機械学習 / 染色体 / コンデンシン / 膨潤化
Outline of Final Research Achievements

Condensins I and II are multisubunit complexes that play a central role in mitotic chromosome assembly. Although both complexes become concentrated along the axial region of each chromatid by metaphase, it remains unclear exactly how such axes might assemble and contribute to chromosome shaping. To address these questions from a physico-chemical point of view, we have established a set of two-step protocols for inducing reversible assembly of chromosome structure in situ. This assay combined with siRNA depletion demonstrate that the recovery of chromatinshapes and the reorganization of axes are highly sensitive to depletion of condensin II, but less sensitive to depletion of condensin I or topoisomerase IIα. Furthermore, quantitative morphological analyses using the machine-learning algorithm wndchrm support the notion that chromosome shaping is tightly coupled to the reorganization of condensin II-based axes.

Academic Significance and Societal Importance of the Research Achievements

本研究では塩濃度の変化させることによって、コンデンシンIIの軸とクロマチンの再組織化への貢献があぶり出された。この成果は、分裂期染色体の構築における染色体軸とクロマチン凝縮の分子メカニズムにに、物理化学的側面が存在することを示している。最近になって、クロマチンはそれ自体で液体のような性質をもち、溶液に含まれる金属イオン濃度などに依存して、動的な性質をもち、染色体表面の電荷が染色体形態を構築する要因として認識され始めている。したがって、今後これらの問題を解明していく上で、本研究で確立されたSCC assayの実験系と、これによる軸構造とクロマチンの再組織化の解析は非常に有用であると考えられる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (15 results)

All 2018 2017 2016 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results) Remarks (10 results)

  • [Journal Article] Ki-67 and condensins support the integrity of mitotic chromosomes through distinct mechanisms2018

    • Author(s)
      Takagi Masatoshi、Ono Takao、Natsume Toyoaki、Sakamoto Chiyomi、Nakao Mitsuyoshi、Saitoh Noriko、Kanemaki Masato T.、Hirano Tatsuya、Imamoto Naoko
    • Journal Title

      Journal of Cell Science

      Volume: 131 Pages: 212092-212092

    • DOI

      10.1242/jcs.212092

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Condensin II plays an essential role in reversible assembly of mitotic chromosomes in situ2017

    • Author(s)
      Ono Takao、Sakamoto Chiyomi、Nakao Mitsuyoshi、Saitoh Noriko、Hirano Tatsuya
    • Journal Title

      Molecular Biology of the Cell

      Volume: 28 Issue: 21 Pages: 2875-2886

    • DOI

      10.1091/mbc.e17-04-0252

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Condensin II plays an essential role in reversible assembly of mitotic chromosomes in situ2017

    • Author(s)
      Ono Takao、Sakamoto Chiyomi、Nakao Mitsuyoshi、Saitoh Noriko、Hirano Tatsuya
    • Organizer
      The 2nd meeting on SMC proteins -chromosomal organizer from bacteria to human-
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Physicochemical properties of condensin-based chromosome axes as revealed by an in-situ reorganization assay2016

    • Author(s)
      Takao Ono, Chiyomi Sakamoto, Noriko Saitoh, Tatsuya Hirano
    • Organizer
      日本分子生物学会
    • Place of Presentation
      パシフィコ横浜(神奈川県横浜市)
    • Year and Date
      2016-11-30
    • Related Report
      2016 Research-status Report
  • [Presentation] 再組織化アッセイをもちいた染色体軸の物理化学的特性の解析2016

    • Author(s)
      小野教夫、坂本智代美、斉藤典子、平野達也
    • Organizer
      染色体学会
    • Place of Presentation
      東京大学弥生講堂(東京都文京区)
    • Year and Date
      2016-11-03
    • Related Report
      2016 Research-status Report
  • [Remarks] 平野染色体ダイナミクス研究室ホームページ

    • URL

      http://www2.riken.jp/chromdyna/

    • Related Report
      2018 Annual Research Report
  • [Remarks] フリー百科事典ウィキペディア「染色体」

    • URL

      https://ja.wikipedia.org/w/index.php?title=%E6%9F%93%E8%89%B2%E4%BD%93&oldid=72274977

    • Related Report
      2018 Annual Research Report
  • [Remarks] フリー百科事典ウィキペディア「姉妹染色分体」

    • URL

      https://ja.wikipedia.org/w/index.php?title=%E5%A7%89%E5%A6%B9%E6%9F%93%E8%89%B2%E5%88%86%E4%BD%93&oldid=66088792

    • Related Report
      2018 Annual Research Report
  • [Remarks] フリー百科事典ウィキペディア「染色体凝縮」

    • URL

      https://ja.wikipedia.org/w/index.php?title=%E6%9F%93%E8%89%B2%E4%BD%93%E5%87%9D%E7%B8%AE&oldid=72556456

    • Related Report
      2018 Annual Research Report
  • [Remarks] フリー百科事典ウィキペディア「コンデンシン」

    • URL

      https://ja.wikipedia.org/w/index.php?title=%E3%82%B3%E3%83%B3%E3%83%87%E3%83%B3%E3%82%B7%E3%83%B3&oldid=72556605

    • Related Report
      2018 Annual Research Report
  • [Remarks] 平野染色体ダイナミクス研究室ホームページ

    • URL

      http://www.riken.jp/chromdyna/index.html

    • Related Report
      2017 Research-status Report 2016 Research-status Report
  • [Remarks] フリー百科事典ウィキペディア「染色体」

    • URL

      https://ja.wikipedia.org/wiki/%E6%9F%93%E8%89%B2%E4%BD%93

    • Related Report
      2016 Research-status Report
  • [Remarks] フリー百科事典ウィキペディア「姉妹染色分体」

    • URL

      https://ja.wikipedia.org/wiki/%E6%9F%93%E8%89%B2%E4%BD%93

    • Related Report
      2016 Research-status Report
  • [Remarks] フリー百科事典ウィキペディア「染色体凝縮」

    • URL

      https://ja.wikipedia.org/wiki/%E6%9F%93%E8%89%B2%E4%BD%93%E5%87%9D%E7%B8%AE

    • Related Report
      2016 Research-status Report
  • [Remarks] フリー百科事典ウィキペディア「コンデンシン」

    • URL

      https://ja.wikipedia.org/wiki/%E3%82%B3%E3%83%B3%E3%83%87%E3%83%B3%E3%82%B7%E3%83%B3

    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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