ヒトがんにおける変異過程のサイン
Ludmil B Alexandrov1, Serena Nik-Zainal, David C Wedge
1Cancer Genome Project, Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridgeshire CB10 1SA, UK.
Nature
|August 16, 2013
まとめ
癌の発症は,体内の変異によって引き起こされる. この研究では,7,042種類の癌で20以上の異なる変異シグネチャーを特定し,多様な生物学的プロセスと潜在的な治療標的を明らかにしました.
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
- 分子腫瘍学 分子腫瘍学
背景:
- ソマティック突然変異は,すべての癌の根本的な原因です.
- これらの変異を生成する生物学的プロセスを理解することは極めて重要ですが,限られています.
- 癌ゲノムには,関わる変異過程を反映したシグネチャーが含まれています.
研究 の 目的:
- 癌変異の大きなデータセットを分析し,変異シグネチャーを特定し,特徴づけます.
- これらのシグネチャーの起源と,臨床的および病因学的要因との関連を調査する.
- 癌ゲノムにおける局所的なハイパーミューテーションイベント ("kataegis") を調査する.
主な方法:
- 7,042件のがんサンプルから得られた4,938,362件の変異を分析した.
- 異なる変異シグネチャーの抽出と分類.
- 患者年齢,変異性物質の曝露,DNA修復の欠陥とのシグネチャの相関.
主要な成果:
- 20以上の異なる変異シグネチャの識別.
- APOBEC酵素,患者年齢,DNA維持に関連するシグネチャーの発見.
- 様々な癌のタイプにおける神秘的なシグネチャーと局所的な超変異 (kataegis) の観察.
- ガン発症の基礎となる多様な変異過程の実証.
結論:
- この研究は,がんに寄与する変異過程の幅広いスペクトルを明らかにしています.
- 変異シグネチャーは,がんの病因,予防,治療戦略の洞察を提供します.
- クリプティックシグネチャーとカテーギスのさらなる研究により,新たな治療法が見つかる可能性があります.
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