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A novel mouse model of syndactyly: The role of CtBP1/2 in limb organogenesis

Research Project

Project/Area Number 19K22695
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 56:Surgery related to the biological and sensory functions and related fields
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Yakushiji-Kaminatsui Nayuta  国立研究開発法人理化学研究所, 生命医科学研究センター, 研究員 (70565316)

Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsエピジェネティクス / 四肢形成 / 合指症 / CtBP / ポリコム複合体 / CtBP1/2 / クロマチン制御 / CUT&Tag / クロマチン高次構造
Outline of Research at the Start

合指症は生まれつき隣り合った指が癒合した状態であり、少なくとも9つのタイプに分類される先天性四肢障害である。遺伝子のミスセンス突然変異やDNA配列の重複が発症原因として報告されているものもあるが、多くのタイプではその原因は不明のままである。本計画ではクロマチン因子の一つであるポリコム複合体とその共役因子であるCTBPに着目し、合指症発症の分子機構をエピジェネティクス制御機構の破綻の観点から明らかにすることを目指す。

Outline of Final Research Achievements

It is known that CtBP1/2 act as co-repressor of Polycomb group (PcG) proteins, however, its function in limb organogenesis is largely unclear. We first generated Ctbp1/2-dKO mice and found that distal and terminal phalanges were completely fused. This specific phenotype resembles Syndactyly type VI, in which the molecular mechanism is unknown. Therefore, in this research project, we aimed to elucidate the molecular mechanism of Syndactyly from the viewpoint of epigenetic regulation by CtBP1/2 and PcG proteins. By using analyses of transcriptome and chromatin profiling, we showed increased levels of H3K27ac and RING1B across potential limb enhancers under the lack of CtBP1/2. We further found that most PcG-target genes tended to be upregulated in the dKO distal limb bud, correlating with increased level of H3K27ac at the promoters. These suggest that CtBP1/2 act as repressor via regulating the H3K27ac levels across promoters and potential limb enhancers during limb organogenesis.

Academic Significance and Societal Importance of the Research Achievements

合指症は生まれつき隣り合った指が癒合した状態であり、外科手術による治療が一般的である。遺伝子のミスセンス突然変異や、DNA配列の重複が発症原因として報告されているものもあるが、多くのタイプではその原因は不明のままである。また、クロマチン抑制因子であるポリコム複合体と、そのコリプレッサーとして作用するCtBP1/2が四肢疾患の発症原因として報告された事例もない。したがって、本研究成果は合指症の発症機序を明らかにするだけでなく、エピゲノムをターゲットとした新しい出生前診断・治療法開発への貢献が大いに期待されるものである。

Report

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

    (2 results)

All 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (1 results)

  • [Journal Article] The Polycomb group protein Ring1 regulates dorsoventral patterning of the mouse telencephalon.2020

    • Author(s)
      Hikaru Eto#, Yusuke Kishi#*, Nayuta Yakushiji-Kaminatsu, Hiroki Sugishita, Shun Utsunomiya, Haruhiko Koseki, and Yukiko Gotoh* (#Equal contribution, *Correspondence)
    • Journal Title

      Nature Communications

      Volume: 11 Issue: 1 Pages: 5709-5709

    • DOI

      10.1038/s41467-020-19556-5

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] A novel mouse model of syndactyly: The role of CtBP1/2 in limb organogenesis2020

    • Author(s)
      Nayuta Yakushiji-Kaminatsui, Hiroki Sugishita, Manabu Nakayama, Haruhiko Koseki
    • Organizer
      53rd Annual Meeting for the Japanese Society of Developmental Biologists
    • Related Report
      2019 Research-status Report

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Published: 2019-07-04   Modified: 2022-01-27  

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