がん発達の過程で,単一の壊滅的な出来事で得られた大規模なゲノム再編成
Philip J Stephens1, Chris D Greenman, Beiyuan Fu
1Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK.
Cell
|January 11, 2011
まとめ
癌の発症には,クロモトリプシスと呼ばれる突然のゲノム危機があり,多数の再編成が徐々にではなく,一度に起こります. この一度の出来事は,複数の癌のタイプに影響を与え,癌を引き起こす変異に影響を与えます.
科学分野:
- ゲノミクスゲノミクスとは
- がん生物学 がん生物学
- 細胞ダイナミクス 細胞ダイナミクス
背景:
- 癌は,伝統的に,遺伝子の変化の漸進的な蓄積の結果として見られています.
- ソマティック突然変異と染色体の再編成は,がんの発症の主要な原動力である.
研究 の 目的:
- 単一の細胞イベントで発生する大規模なゲノム再編成の現象を特徴づける.
- この現象ががんの起源と進化に及ぼす影響を調査する.
主な方法:
- ゲノム変異を分析するために次世代配列を活用した.
- 染色体再配列の特徴的なパターンを特定し,単一の災害の兆候を示した.
主要な成果:
- 一つの細胞危機で数十から数百のゲノム再編成が起こるプロセスを"クロモトリプシス (chromothripsis) "と特定し,命名した.
- 2つのコピー番号状態の間の急速な振動を含むクロモトリプシスの特徴を観察した.
- すべての癌の2-3%に存在するクロモトリプシスが見つかりました,特に骨癌の25%です.
- がんを誘発する病変が,この単一のゲノム危機から生じる可能性があることを実証した.
結論:
- クロモトリプシスは,癌におけるゲノム不安定性の明確なメカニズムであり,漸進的な蓄積とは異なる.
- この現象は,ゲノム複雑性と腫瘍発生の急速な出現を理解する上で重要な意味を持つ.
- この発見は,一度の細胞の破滅が,がんの発症を誘発する可能性があることを示唆している.
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