p53の喪失後の有序で決定的ながんゲノム進化

Timour Baslan¹, John P Morris^1,2,3, Zhen Zhao^1,4

¹Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.

Nature

|August 17, 2022

まとめ

驚くべきことに腫瘍抑制剤p53の喪失は臓がんの発症の過程で予測可能な進化の経路をたどりますこの発見は,TP53変異性がんの新たな治療目標を提供します.

科学分野:

腫瘍学
遺伝学
ゲノミクス

背景:

p53の無活性化がヒトの癌でよく見られる現象で,ゲノムの不安定性を促進する.
腫瘍形成におけるp53喪失後の正確なゲノム進化パターンは十分に理解されていません.

研究の目的:

管腺がんにおけるp53不活性化後のゲノム進化パターンを調査する.
P53の喪失が,がんの発症中に予測可能なまたは混沌としたゲノム変化につながるかどうかを判断する.

主な方法:

早期のp53異胞性喪失による臓管腺癌のマウスモデルを使用した.
単細胞配列決定と in situ 遺伝子型決定を用いて,p53不活性化からがんへのゲノム進化を追跡した.
腫瘍前および腫瘍前進行中のゲノム変化とともに,組織学的段階を分析した.

主要な成果:

臓がんの進行におけるp53不活性化は,決定的な4段階のゲノム進化をたどる:ヘテロジゴシティの喪失,デレーション,ゲノムの倍増,および増強/増幅.
削除イベントは,全体的なゲノム異質性にもかかわらず,特定の経路をターゲットにして固定されます.
ゲノム進化の各段階は異なる組織学的段階と相関しています

結論:

p53の無活性化が遺伝的カオスへの入り口であるだけでなく予測可能なゲノム進化パターンを誘導する可能性があります
これらの決定的パターンを理解することで,TP53変異がんの新たな治療戦略が明らかになる可能性があります.

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