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ソニック・ヘッジホッグ・メドゥロブラストーマにおける生殖線延長器変異
Sebastian M Waszak1, Giles W Robinson2, Brian L Gudenas3
1European Molecular Biology Laboratory (EMBL), Genome Biology Unit, Heidelberg, Germany.
Nature
|April 17, 2020
まとめ
希少な胚性変異のELP1遺伝子は 希少な脳がんである小児性ソニック・ヘッジホッグ・メドゥロブラストーマの 共通原因である. この発見は,がんの発症における タンパク質のホメオスタシスの役割を強調しています.
科学分野:
- ゲノミクスと分子生物学
- 小児腫瘍学
- 癌 傾向 症候群
背景:
- がんゲノミクスは悪性腫瘍の 重要な要因を特定しましたが 珍しいがんの 遺伝的基盤は 未知のままです
- 遺伝的傾向は5-10%の小児がんに寄与しますが,協力する遺伝的現象は十分に理解されていません.
- 以前の研究では,髄芽細胞腫患者の5%で病原性生殖系変異が確認された.
研究 の 目的:
- 骨髄芽細胞腫の傾向に関連した新しい遺伝子を特定する.
- 小児性髄芽細胞腫,特にソニック・ヘッジホッグ (MB_SHH) サブグループにおけるゲルムライン機能喪失変異の役割を調査する.
- ELP1変異と髄芽細胞腫の病原性を結びつける分子メカニズムを解明する.
主な方法:
- 小児髄芽細胞腫患者のタンパク質をコードする遺伝子の全エクソーム配列解析
- ELP1遺伝子における生殖系機能喪失変異の分析
- 遺伝的な癌の親子と血統分析
- 分子サブタイプ化 (SHHα) と体内の変化の分析 (例えば,PTCH1,染色体9q喪失).
- エロゲーター複合体の機能,tRNA変異,および腫瘍サンプルにおけるタンパク質ホメオスタシスの調査.
主要な成果:
- 小児MB_ SHH患者の14%でELP1の希少な生殖系統機能喪失変種が特定され,このサブタイプで最も一般的な傾向遺伝子となった.
- ELP1の変異は,小児MB_ SHHの遺伝的傾向を40%まで増加させた.
- ELP1に関連した髄芽細胞腫は9q喪失によるELP1のバイアレル性無活性化を示し,しばしばPTCH1の変異と併発し,SHH信号伝達との協力を示唆した.
- 腫瘍は不安定な延長複合体,減少したtRNA変異,およびプロテオームの不安定性の兆候を示した.
結論:
- ゲルムラインの機能喪失変異は, somatic SHH経路の活性化と協調して,小児MB_ SHHの有意な予備因子である.
- ELP1の欠乏は,エロンゲーター複合体の機能不全を引き起こし,タンパク質の恒常性に影響を与え,潜在的に髄芽細胞腫の発症を誘発する.
- プロテオームの不安定性は,小児脳がんの病原性における重要な決定因子であり,さらなる調査と潜在的な治療標的を保証する.
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