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Novel machinery of maintenance of genomic integrity by multinuclease complexes

Research Project

Project/Area Number 19K06784
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 45010:Genetics-related
Research InstitutionKindai University

Principal Investigator

Saito Takamune  近畿大学, 生物理工学部, 講師 (60741494)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords減数分裂 / 線虫 / ファンコニ貧血 / 交差型組換え / 減数分裂組換え / 多重ヌクレエース複合体 / エピジェネティクス / ホリデイジャンクションリゾルベース / 不妊症 / DNA修復 / ファンコニアネミア
Outline of Research at the Start

本研究では申請者らが発見したHIM-18/SLX4 多重ヌクレエース複合体について、体細胞と生殖細胞でのDNA修復機能を解析し、ファンコニ貧血や癌などの染色体異常疾患や不妊症への治療へと役立てる事を目的とする。HIM-18はDNA修復異常を呈するファンコニ貧血の原因遺伝子の一つである。申請者は線虫を用いてhim-18変異のDNA修復異常を抑制するサプレッサー変異体の単離に成功しており、その原因遺伝子の遺伝学的、生化学的な機能解析を行うことでファンコニ貧血の治療薬開発に貢献する。また生殖細胞研究の新展開として、各ヌクレエースの染色体部位特異的な減数分裂組換えの制御機構について開拓する。

Outline of Final Research Achievements

We tried to identify the suppressor mutations for him-18, which is a C. elegans homolog of the Fanconi anemia gene SLX4. We succeeded to narrow down the candidates to seven genes in the strain #249 and six genes in the strain #296. The amount of DNA double-strand breaks was reduced in him-17 mutants and they localized even in the central region of chromosomes. Crossover distribution is limited to the one of the arm regions of chromosomes in wild-type. Crossover distribution shifted to the central region of the chromosome in him-17 mutants. From those results, it was clarified that HIM-17 has a function of inducing DNA double-strand breaks among the chromosome arms and promoting crossover in the arm regions and suppressing crossover in the central region of the chromosomes. We also clarified that HIM-17 functions for accurate chromosome segregation during meiosis I by regulation of the chromosomal localization of the kinase and the phosphatases.

Academic Significance and Societal Importance of the Research Achievements

him-18/SLX4のサプレッサー変異は国内外でも同定されておらず、候補が6-7遺伝子に絞り込まれたことは意義のある成果といえる。今後の展望としては、候補遺伝子を一つに絞り込み、患者の細胞を用いてファンコニ貧血治療への応用を探る事になる。
交差分布の制御機構に関して、制限酵素処理を省く事ができる実験系を確立でき、大幅な手間と時間の短縮に貢献した。him-17変異体では、ヒストンH3K9のジメチル化が減少し、DNA二重鎖切断の染色体腕部への偏りが解除された。結果として交差分布が染色体中央にシフトした事は、染色体のエピジェネティックな変化が交差分布に影響を与えうる事を示したと言える。

Report

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

    (20 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (4 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (12 results) (of which Int'l Joint Research: 1 results) Remarks (1 results)

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

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Dundee/University of Edinburgh(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Harvard Medical School(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Harvard Medical School/Children's Hospital Boston/University of California, Berkeley(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] HIM-17 regulates the position of recombination events and GSP-1/2 localization to establish short arm identity on bivalents in meiosis2021

    • Author(s)
      Nadarajan S, Altendorfer E, Saito TT, Martinez-Garcia M, Colaiacovo MP.
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 118 Issue: 17

    • DOI

      10.1073/pnas.2016363118

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] HIM-17 regulates the position of recombination events and GSP-1/2 localization to establish short arm identity on bivalents in meiosis2021

    • Author(s)
      Saravanapriah Nadarajan, Elizabeth Altendorfer, Takamune T. Saito, Marina Martinez-Garcia and Monica P. Colaiacovo
    • Journal Title

      Proceedings of the National Academy of Sciences of the USA

      Volume: 119

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The demethylase NMAD-1 regulates DNA replication and repair in the Caenorhabditis elegans germline.2019

    • Author(s)
      Wang SY, Mao H, Shibuya H, Uzawa S, O'Brown ZK, Wesenberg S, Shin N, Saito TT, Gao J, Meyer BJ, Colaiacovo MP, Greer EL
    • Journal Title

      PLoS Genetics

      Volume: 15 Issue: 7 Pages: e1008252-e1008252

    • DOI

      10.1371/journal.pgen.1008252

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] SLX-1は染色体中央領域で交差型組換えを抑制する2022

    • Author(s)
      山本航暉, 齋藤貴宗
    • Organizer
      関西地区線虫勉強会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 線虫の性染色体対合による常染色体交差の転換機構2022

    • Author(s)
      南寛仁, 齋藤貴宗
    • Organizer
      関西地区線虫勉強会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 線虫の性染色体対合異常による常染色体交差の転換機構2021

    • Author(s)
      南寛仁, 山本航暉, 齋藤貴宗
    • Organizer
      第39回染色体ワークショップ、第19回核ダイナミクス研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 線虫HIM-17による第一減数分裂前期のニ価染色体形成機構2021

    • Author(s)
      齋藤貴宗, Saravanapriah Nadarajan, Elizabeth Altendorfer, Marina Martine-Gracia, Monica P. Colaiacovo
    • Organizer
      第39回染色体ワークショップ、第19回核ダイナミクス研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 線虫の性染色体対合異常による常染色体交差の転換機構2021

    • Author(s)
      南寛仁, 山本航暉, 齋藤貴宗
    • Organizer
      第44回日本分子生物学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Meiotic roles of FANCM-related helicases in C. elegans2021

    • Author(s)
      Kyosuke Torimaru, Karin Matsushita, Takamune T. Saito
    • Organizer
      23rd International C. elegans Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ヒストンH3K9メチル化酵素の減数分裂組換えでの役割2021

    • Author(s)
      納家朋里、齋藤貴宗
    • Organizer
      関西地区線虫勉強会
    • Related Report
      2020 Research-status Report
  • [Presentation] ホリデイジャンクション解離酵素SLX-1による交差型組換え抑制機構の解明に向けて2021

    • Author(s)
      嵜本優斗、齋藤貴宗
    • Organizer
      関西地区線虫勉強会
    • Related Report
      2020 Research-status Report
  • [Presentation] HIM-17 regulates the remodeling of bivarents during meiosis2021

    • Author(s)
      齋藤貴宗
    • Organizer
      関西地区線虫勉強会
    • Related Report
      2020 Research-status Report
  • [Presentation] Meiotic functions of dicer-related helicase2020

    • Author(s)
      鳥丸恭佑、齋藤貴宗
    • Organizer
      関西地区線虫勉強会
    • Related Report
      2019 Research-status Report
  • [Presentation] An enhancer/suppressor screening of mutants of a Holliday junction resolvase2020

    • Author(s)
      南寛仁、齋藤貴宗
    • Organizer
      関西地区線虫勉強会
    • Related Report
      2019 Research-status Report
  • [Presentation] ホリデイジャンクションリゾルベースhim-18/SLX4のエンハンサー/サプレッサースクリーニング2019

    • Author(s)
      齋藤貴宗、Hussam Alshareef、南寛仁、荒谷祥、Monica Colaiacovo
    • Organizer
      第25回DNA複製・修復・組換えワークショップ
    • Related Report
      2019 Research-status Report
  • [Remarks] Saito lab

    • URL

      https://takamunetsaito.wixsite.com/saito-lab

    • Related Report
      2021 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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