"オンコヒストン"変異がヒトの癌に広がる
Benjamin A Nacev1,2, Lijuan Feng2, John D Bagert3
1Memorial Sloan Kettering Cancer Center, New York, NY, USA.
Nature
|March 22, 2019
まとめ
ソマティックヒストンの変異は様々な癌の約4%で発見され,重要なタンパク質領域に影響します. コアヒストンのこれらの変異は,クロマチンの機能を変化させることで,がんを誘発する可能性があります.
科学分野:
- 癌 生物学
- エピジェネティクス
- 分子生物学
背景:
- エピジェネティック経路の変異は がんの主要な原動力です
- ヒストンの変異,特にヒストンのH3N末端の"オンコヒストン"は,特定の癌で知られており,ポリコンブ抑制複合体 (PRC1およびPRC2) に影響します.
- さまざまな癌の種類におけるヒストン変異のより広範な有病率と機能的影響は,ほとんど未調査のままである.
研究 の 目的:
- 多様なヒト腫瘍における体内ヒストンの変異の発生率と位置を調査する.
- 変異によって影響を受けた重要なヒストン領域と残基を特定する.
- これらの変異が染色体調節と癌の発生に及ぼす機能的影響を推測する.
主な方法:
- 様々な腫瘍型における体内ヒストンの変異に関する包括的なデータセットの分析.
- N端尾と球状ドメインを含むヒストンタンパク質内の変異位置の特定.
- 特定された変異を既知の機能ドメインと同類酵母変異者と比較する.
主要な成果:
- 多様な腫瘍の約4%で体内ヒストンの変異が確認された.
- 変異は,N端尾と球状ドメインの両方の4つのコアヒストン (H2A,H2B,H3,H4) に影響する.
- 変異は,H2A/H2Bの酸性パッチ,およびH2B-H4のインターフェイスで,SWI/SNFの機能に影響する酵母に同類するいくつかの変異体で発生する.
結論:
- ソマティックヒストンの変異は,以前に認識されたものより,より一般的で多様です.
- これらの変異は,機能的に重要なヒストンの領域に発生し,腫瘍形成における重要な役割を示唆しています.
- この発見は,癌とクロマチンの調節におけるヒストン変異の役割に関する将来の研究に貴重なリソースを提供します.
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