複製のストレスは,ミトーシスのDNA修復合成を活性化します
Sheroy Minocherhomji1, Songmin Ying2,3, Victoria A Bjerregaard1
1Center for Chromosome Stability and Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, Panum Institute, Blegdamsvej 3B, 2200 Copenhagen N, Denmark.
Nature
|December 4, 2015
まとめ
腫瘍遺伝子の誘発による複製ストレスが 脆弱な部位を作り出すことで 癌を誘発します これらの部位におけるMUS81核酵素の活動は,ミトーシス中のDNA合成を促進し,染色体の誤差分離を防止し,がん治療の標的となる可能性がある.
科学分野:
- 遺伝学
- 分子生物学
- 癌 生物学
背景:
- 腫瘍遺伝子の活性化により 腫瘍発生の重要な要因である DNA複製のストレスが発生します
- 常見の脆弱部位 (CFS) は,癌の破裂や再編成に弱いゲノム領域です.
- MUS81-EME1エンドヌクレアスは,複製ストレス下にあるCFSのDNA構造を分解することが知られている.
研究 の 目的:
- ミトーシス中のCFSにおける複製ストレスの管理におけるMUS81の役割を調査する.
- MUS81の活動が染色体安定性に影響を与えるメカニズムを解明する.
- ガンにおけるMUS81媒介のDNA合成を標的とした治療の可能性を探る.
主な方法:
- 細胞培養と複製ストレスへの曝露
- CFSにおけるMUS81の局所化を追跡するための免疫光.
- POLD3依存性を用いたCFSにおけるDNA合成の分析.
- 染色体分離の誤差と不結合の評価
主要な成果:
- MUS81は mitotic prophaseに入るとCFSに招集されます.
- MUS81核酵素の活動は,CFSにおけるPOLD3依存のDNA合成を駆動する.
- このミトのDNA合成は染色体の誤差分離と非離合を最小限に抑えます
- この経路は,高染色体不安定性 (CIN ((+)) のアヌプロイドがん細胞で強化されています.
結論:
- ミトスプロファーゼは,CFSにおけるMUS81媒介によるDNA複製の完成を誘発する.
- このプロセスは,特に複製のストレス下での染色体分離を防止します.
- POLD3依存型ミトックDNA合成をターゲットにすることで,染色体不安定な癌に対する新しい治療戦略が提示されます.
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