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ヒストンマークH3K36me2はDNMT3Aを採用し,遺伝子間のDNAメチル化パターンを形成する.
Daniel N Weinberg1, Simon Papillon-Cavanagh2, Haifen Chen2
1Laboratory of Chromatin Biology and Epigenetics, The Rockefeller University, New York, NY, USA.
Nature
|September 6, 2019
PubMed で要約を見る
まとめ
ヒストンメチルトランスフェラーゼNSD1は,DNAメチルトランスフェラーゼDNMT3Aをインタージェニック領域に誘導し,DNAメチル化を維持する. 変異によってこの経路が破壊され 異常なメチル化が発達障害や癌に繋がります
科学分野:
- エピジェネティクスと遺伝子調節
- 分子生物学
- 発達生物学
背景:
- DNAメチル化は哺乳類の発達と細胞運命を決定し,DNAメチルトランスフェラーゼ (DNMTs) が重要な役割を果たします.
- ヒストンの改変が遺伝子プロモーターと体におけるDNAメチル化に影響を与える一方で,遺伝子間DNAメチル化のメカニズムは不明である.
- Tatton-Brown-Rahman症候群 (TBRS) とソトス症候群は,それぞれDNMT3AとNSD1に関連しており,関連性を示唆しています.
研究 の 目的:
- 遺伝子間のDNAメチル化を制御するメカニズムを解明する.
- 発達障害とがんにおけるNSD1,DNMT3A,DNAメチル化との関連を調査する.
主な方法:
- DNMT3Aの局所化と活性に関する全ゲノム分析.
- ヒストンの改変によるDNMT3AのPWWP領域のインビトロ結合測定
- ネズミの細胞におけるNsd1とNsd2の遺伝的消去
- 患者サンプルにおける遺伝子間のDNAメチル化分析
主要な成果:
- NSD1媒介のH3K36me2は,DNMT3Aの募集とDNAメチル化の維持に不可欠である.
- DNMT3Aは,ユークロマティック非コード領域でH3K36me2とコロカライズする.
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