核アミン酸化酵素ホモログLSD1によって媒介されるヒストンの脱メチル化
Yujiang Shi1, Fei Lan, Caitlin Matson
1Department of Pathology, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA.
Cell
|December 29, 2004
まとめ
この研究では,リジン特異性デメチラゼ1 (LSD1) を重要なヒストンデメチラゼとして特定しています. LSD1はヒストンH3ライシン4からメチル群を除去し,遺伝子転写を調節し,ヒストンメチル化の動的制御を明らかにする.
科学分野:
- エピジェネティクス エピジェネティクス
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
背景:
- アセチル化およびメチル化などのヒストンの尾の翻訳後の改変は,クロマチンの構造と遺伝子転写の重要な調節因子です.
- ヒストンのアセチル化は,対極の酵素 (アセチルトランスフェラーゼとデサセチラーゼ) によって動的に調節されるが,ヒストンのメチル化のための対極の酵素活性性の存在は不明であった.
研究 の 目的:
- ヒストンのメチル化が,反対の活動を持つ酵素によっても調節されているかどうかを調査する.
- 新型ヒストン脱メチラーゼの機能を特定し,特徴づけること.
主な方法:
- LSD1.1の発現を抑制するためにRNA干渉 (RNAi) を利用した.
- ヒストンH3ライシン4メチル化レベルの評価された変化.
- 標的遺伝子の転写活性を監視した.
主要な成果:
- リジン特異性デメチラーゼ1 (LSD1) は,ヒストンデメチラーゼとして機能する核アミン酸化酵素として特定されました.
- LSD1はヒストンH3ライシン4を特異的にデメチル化し,これは活性転写に関連するマークである.
- RNAiによるLSD1の抑制は,H3リシン4メチル化と標的遺伝子の減圧を増加させ,トランスクリプション抑制におけるLSD1の役割を示している.
結論:
- LSD1はヒストン脱メチラーゼとして機能し,酸化反応を通じてヒストンH3ライシン4からメチル群の除去を触媒として作用する.
- この発見は,ヒストンメチル化のダイナミックな調節を明らかにし,ヒストンメチラゼとデメチラゼの両方を含む,酵母からヒトに保存される.
- LSD1は,ヒストンH3ライシンを積極的にデメチル化することによって,転写的コアプレッサーとして作用する 4.
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