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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
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ヒトの多能幹細胞は,支配的な負のP53変異を繰り返し獲得し,拡大する
Florian T Merkle1,2,3,4, Sulagna Ghosh1,2,3,4, Nolan Kamitaki3,5,6
1Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA 02138, USA.
Nature
|April 27, 2017
まとめ
培養されたヒトの多能幹細胞 (hPS細胞) は,がんに関連したTP53変異を受け取り,成長の利点を授与することができる. これらの貴重な幹細胞の臨床使用の前に 遺伝的特徴づけが不可欠です
科学分野:
- 幹細胞生物学
- 遺伝学
- 癌の研究
背景:
- 人間の多能幹細胞 (hPS細胞) は,自己再生能力があるため,再生医療に不可欠です.
- 培養されたhPS細胞は,コピー番号の変異を含む遺伝的変異を蓄積し,安全性に影響を与える可能性があります.
- hPS細胞の複製数変異を超えて獲得された変異のスペクトルはほとんど不明である.
研究 の 目的:
- 培養されたヒト胚性幹細胞 (hES) 系統における獲得されたゲノム配列変異の性質と機能的影響を調査する.
- hPS細胞系におけるがん関連変異を特定し,特に臨床用途の細胞系を特定する.
- hPS細胞におけるTP53変異の有病率と選択的優位性を評価する.
主な方法:
- 140の独立したhES細胞のエクソーム配列化
- 細胞系内のモザイク変異を検出するための計算分析
- 117のhPS細胞系から公表されたRNAシーケンシングデータを採取した.
- TP53変異のアレル分子の分析と通路数との相関
主要な成果:
- 5つの無関係なhES細胞系で6つのTP53変異が特定され,すべてヒトがんに共通する支配的陰性変異をコードしている.
- TP53変異のアレル分数は経路数とともに増加し,選択的成長の利点を示した.
- 他のhPS細胞系ではさらに9つのTP53変異が発見され,P53のDNA結合領域に影響を与えた.
- 選択的優位性をさらに強化した3つの線で,TP53の位置におけるヘテロジゴシティの喪失が観察されました.
結論:
- 培養されたhPS細胞は,標準培養条件下で,がんに関連したTP53変異を取得し,拡大することができます.
- これらの変異は選択的優位性を与え 潜在的に気づかれずに済む可能性があります
- hPS細胞およびその誘導体の厳格な遺伝的特徴は,患者の安全性を確保するために,臨床適用前に不可欠です.
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