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トポグラフィック・シングル・セル・シーケンシングによって特定された乳がんにおける多細胞侵入
Anna K Casasent1, Aislyn Schalck1, Ruli Gao2
1Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA; Graduate School of Biomedical Sciences, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
Cell
|January 9, 2018
まとめ
トポグラフィック・シングル・セル・シーケンシング (TSCS) は,乳がんが侵襲性になる前に,どのように早期に進化するのかを明らかにします. ほとんどのゲノム変化は 侵入前にダクト内で発生し,マルチクローン侵入モデルをサポートします.
科学分野:
- 腫瘍学
- ゲノミクス
- 癌 生物学
背景:
- 管内がん (DCIS) は乳がんの初期段階である.
- 腫瘍の進化を研究する上で課題があるため,DCISから侵入性管内がん (IDC) への進行は完全に理解されていません.
- 腫瘍内異質性と局所的な腫瘍細胞数は,ゲノム解析を複雑にする.
研究 の 目的:
- 単一の腫瘍細胞の空間的な文脈内のゲノム変化を分析するための新しい方法を開発し,適用する.
- 乳がんのゲノム進化を インサイトから 侵襲的な段階まで描画する.
- DCISとIDCの集団間のクローン関係を調査する.
主な方法:
- トポグラフィック・シングル・セル・シーケンシング (TSCS) の開発で,シングル・腫瘍細胞の複製数変異をプロファイルする.
- 組織内の単一の腫瘍細胞の空間的な文脈の保存.
- シンクロンDCISとIDCを患った10人の患者から1,293人の単細胞にTSCSを適用し,エクソームシーケンシングで補完しました.
主要な成果:
- TSCSは,空間情報を保持しながら,単一の腫瘍細胞のゲノムコピー数プロフィールを測定することに成功しました.
- 直接的なゲノム系は,in situと侵入性腫瘍サブ集団の間に特定されました.
- ほとんどの変異とコピー番号の偏差は 侵入前にダクト内で進化したことが判明しました
結論:
- この研究は,管内がんと侵入性管内がんを直接的に関連付けるゲノム学的証拠を提供します.
- ゲノム進化は 変異とコピー番号の偏差を含めて 侵襲的プロセスに大きく先立ちます
- 発見は,先行進化したクローンが 侵入性がんを形成するために 経路から拡散するマルチクローン侵入モデルを支持する.
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