ヒトがんにおける体内複製数の変異の風景
Rameen Beroukhim1, Craig H Mermel, Dale Porter
1Cancer Program and Medical and Population Genetics Group, The Broad Institute of M.I.T. and Harvard, 7 Cambridge Center.
Nature
|February 19, 2010
まとめ
ヒトがんにおける頻繁なゲノム変異を特定することで,重要な腫瘍発生遺伝子が明らかになる. 多くの新しい癌の原動力遺伝子が複数の癌のタイプで発見され,共通の遺伝的脆弱性を強調しました.
科学分野:
- ゲノミクスゲノミクスとは
- 癌生物学 癌生物学について
- 分子腫瘍学 分子腫瘍学
背景:
- 癌を誘発する遺伝子 (腫瘍生成) を特定することは,標的型治療の開発に極めて重要です.
- ソマティックコピーナンバー変異 (SCNA) は,がんにおける頻繁なゲノム変化です.
- 様々な癌のSCNAを分析することで,共通の遺伝的要因が明らかになる.
研究 の 目的:
- 高解像度のSCNAデータを分析することによって,腫瘍発生における因果的な役割を持つ新しい遺伝子を特定する.
- 焦点SCNAの頻度と分布を複数のヒトがんタイプで決定する.
- がん細胞生存における特定されたSCNAおよび関連する遺伝子の機能的重要性を調査する.
主な方法:
- 26の組織学的なタイプの3,131のがん標本からの体内コピー数変異 (SCNA) の高解像度分析.
- 複数の癌タイプにおいて,著しい頻度で変化した焦点SCNA領域の特定.
- SCNA領域内の豊かな遺伝子ファミリーと経路を特定するためのバイオ情報分析.
- 癌細胞生存に対する遺伝子増幅の影響を評価するための機能的測定法.
主要な成果:
- 焦点SCNAの158の領域が,いくつかのがんタイプにおいて有意な頻度で特定されました.
- これらの領域の122は,以前に知られているがん標的遺伝子を含んでいませんでした.
- BCL2とNF-kappaBeta経路を含む遺伝子ファミリーは,これらの新しいSCNA領域に豊かに含まれていた.
- MCL1およびBCL2L1の増幅を有する癌細胞は,これらの抗アポプトシス遺伝子の生存への依存を示した.
- 特定されたSCNAのほとんどは,異なる個々の癌タイプで共有されました.
結論:
- 頻繁なSCNA分析は,新しいがんの原動力遺伝子を発見するための強力な方法です.
- SCNAプロファイリングにより,いくつかの新規候補腫瘍遺伝子とがん関連経路が特定されました.
- この発見は,MCL1やBCL2L1のような特定の抗アポプトシス遺伝子をターゲットにすることが治療戦略である可能性があることを示唆しています.
- 癌の種類間で共有されているSCNAの流行は,共通の基礎的メカニズムと,クロスガン療法の可能性を示しています.
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