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再発性急性リンパ性白血病におけるCREBBP変異

Charles G Mullighan1, Jinghui Zhang, Lawryn H Kasper

  • 1Department of Pathology, St Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.

Nature
|March 11, 2011
PubMed
まとめ

再発性急性リンパ性白血病 (ALL) は,若者において致命的です. 遺伝子解析により,CREBBPおよび他の遺伝子の変異が明らかにされ,治療抵抗性および疾患再発を誘発する.

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科学分野:

  • 遺伝学 遺伝学とは
  • 分子生物学は分子生物学である.
  • 腫瘍学 腫瘍学

背景:

  • 再発性急性リンパ性白血病 (ALL) は,若者における癌による死亡の主な原因である.
  • ALLの治療失敗に寄与する基礎となる生物学的要因は十分に理解されていません.
  • 以前の研究では,構造的なDNAの変異と,診断からALLの再発までの遺伝的進化を特定しました.

研究 の 目的:

  • 再発性ALLにおける新しいDNA配列変異を特定する.
  • 治療耐性および再発における遺伝子変異の役割を調査する.
  • 特定された突然変異が遺伝子調節に与える機能的影響を分析する.

主な方法:

  • 23人のALL患者からのマッチングされた診断と再発のサンプルで300の遺伝子の再配列化.
  • 71例の診断再発症例と270例の非再発急性白血病症例の拡張コホート分析.
  • ヒストンのアセチル化と遺伝子発現に対する突然変異の影響を評価するための機能検査.

主要な成果:

  • CREBBP,NCOR1,ERG,SPI1.1の新規変異を含む32の遺伝子で52の非同義性体内変異を特定しました.
  • 再発症例の18.3%で,ヒストンアセチルトランスファーゼ活性に影響するCREBBP変異 (配列または消去) が発見されました.
  • 再発時に得られた突然変異は,診断時にサブクローンに時々存在することを観察し,治療抵抗性における役割を示唆しました.

結論:

  • 転写および表遺伝的調節を標的とする変異,特にCREBBPでは,ALLにおける抵抗の重要なメカニズムです.
  • これらの発見は,白血病における遺伝的変異の理解を広げています.
  • これらの変異を特定することで,再発性ALLの新たな治療標的となる可能性があります.