単核のHi-Cは,卵細胞からジゴットへの移行時にユニークなクロマチンの再編成を明らかにします
Ilya M Flyamer1,2,3, Johanna Gassler1, Maxim Imakaev4,5
1IMBA - Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna Biocenter (VBC), Dr Bohr-Gasse 3, 1030 Vienna, Austria.
Nature
|March 30, 2017
まとめ
クロマチンは受精後に重要な再プログラムを受け,マウスジゴットの母体ゲノムと父体ゲノムの中でユニークな3次元組織を確立します. クロマチンの特徴を明らかにしました
科学分野:
- 発達生物学
- ゲノミクス
- エピジェネティクス
背景:
- クロマチンの再プログラミングは受精後の全能性には不可欠です
- 母性ゲノムと父性ゲノムは ジゴットに共存するが,その空間的組織は不明である.
- 既存の染色体構成の捕捉方法は,卵細胞や卵胞のような希少な細胞には適していません.
研究 の 目的:
- マウス・オオサイトとジゴットの3次元クロマチン組織を調査する.
- 希少な細胞タイプに適用できる単核 Hi-C 方法を開発する.
- ジゴット内の母性ゲノムと父性ゲノムのクロマチン組織を比較する.
主な方法:
- 希少な細胞における高解像度クロマチンの構成捕捉のための新しい単核Hi-Cプロトコルを開発した.
- 3Dゲノム構造を分析するために マウスの卵細胞と卵胞にプロトコルを適用しました
- コンパートメント,トポロジカルアソシエイトドメイン (TAD),ループなどの定量化されたゲノム特性.
主要な成果:
- クロマチンの構造はオオサイトからジゴートへの移行時に独特に再編成されます.
- シングル・ジゴット内の父核と母核は,異なるクロマチンの組織を示している.
- TADとループはジゴティック母性染色体に存在し,コンパートメントは存在しない.
- ストカスティックな接触クラスタは,サブメガベースレベルで観察されます.
結論:
- サイゴティック核は,独特のグローバルクロマチン組織,独特の"基底状態"を持っています.
- コンパートメント,TAD,ループを生成するメカニズムは異なります.
- このジゴティッククロマチンの状態を理解すると,細胞のトーティポテンシーへの再プログラムに関する洞察が得られます.
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