X染色体トポロジーのコンデンシン駆動的リモデリングは,投与量補償中に発生する
Emily Crane1, Qian Bian1, Rachel Patton McCord2
1Howard Hughes Medical Institute and Department of Molecular and Cell Biology, University of California-Berkeley, Berkeley, California 94720-3204, USA.
Nature
|June 2, 2015
まとめ
投与補償複合体 (DCC) は,トポロジカルアソシエイトドメイン (TAD) を作成することによって,X染色体をC. elegansのユニークな3D構造に改造します. このDCC依存構造は,X染色体全体で遺伝子発現を調節する.
科学分野:
- ゲノミクスゲノミクスとは
- 分子生物学は分子生物学である.
- エピジェネティクス エピジェネティクス
背景:
- ゲノムの3D組織は,遺伝子調節に極めて重要です.
- 高階染色体構造のメカニズムは,ほとんど不明のままである.
- X染色体用量補償は,C. elegans. の遺伝子発現をバランスとします.
研究 の 目的:
- C. elegansの3Dゲノムをマッピングする.
- X染色体構造と遺伝子調節における用量補償複合体 (DCC) の役割を理解する.
- DCCがX染色体をどのように改造するかを調査する.
主な方法:
- ゲノム全体の染色体構成のキャプチャ (Hi-C).
- 光インシチュートハイブリダイゼーション (FISH).
- RNAシーケンシング (RNA-seq).
- CRISPR/Cas9による遺伝子編集.
主要な成果:
- DCCは,ヘルマフロイドX染色体を,異なるトポロジカルアソシエイトドメイン (TAD) を有する性特異の3D形状に改造します.
- X染色体TADは,オートソームと比較して,より強い境界線と規則的な間隔を示しています.
- DCC結合部位 (レックス部位) は,TAD境界形成とX染色体のトポロジーに不可欠です.
結論:
- DCCはX染色体に独特の高階構造を課し,オートソームとは異なる.
- DCCは,レックスサイト経由でTADの境界を作り,強化することによって,X染色体のトポロジーを再構築する.
- このDCC主導の構造的組織は,染色体全体の遺伝子発現の調節に不可欠です.
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