乳がんと関連するクローンの進化史
Tomomi Nishimura1,2,3, Nobuyuki Kakiuchi1,4,5, Kenichi Yoshida1,6
1Department of Pathology and Tumour Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Nature
|July 26, 2023
まとめ
乳がんの進化には 早期に誘導因子の変異が起こり 癌でないクローンが がんになる前に発生します この研究は,特定の遺伝的変異を持つ乳がんの独特の進化の経路を明らかにしています.
科学分野:
- 腫瘍学
- 遺伝学
- 進化生物学
背景:
- 常見の癌変異は正常な組織で発生し,癌の発症に先立ちます.
- 早期のクローン進化における ドライバーイベントのシーケンスと順序は ほとんど不明である.
- 乳がんの早期発症を理解することは 早期発見と予防に不可欠です
研究 の 目的:
- 染色体変異による乳がんの独特の進化史を解明する.
- 乳がんの発症のタイミングと順序を決定する.
- 腫瘍内異質性の起源と癌の創始者の進化を調査する.
主な方法:
- 微小切断された癌と非癌的病変の系統分析
- 正常な上皮細胞の変異率を用いた初期の進化のタイミングの推定.
- 乳がんとAKT1変異患者の進化パターンの比較分析
主要な成果:
- デリバティブ染色体 der ((1;16) は,30代前半に共通の祖先を先行して,青春期に獲得されました.
- 癌と非癌の両方のクローンは この共通の祖先から進化し,非癌のクローンは癌に先行した.
- 複数の独立した癌の創始者はしばしば非癌の祖先から発生し,腫瘍の異質性に貢献した.
- 誘導因子の数は組織学と相関せず,微環境的または表遺伝的影響を示唆した.
結論:
- 乳がんの進化は,正常な組織におけるドライバイベントの早期獲得を含む多段階のプロセスです.
- 癌でないクローンは 複数の独立した癌の創始者の前駆体として機能します
- この研究は,乳がんの進化の軌跡,特に乳がんの症例について新しい洞察を提供している.
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