KDM1BはヒストンH3K4脱メチラーゼで,母親のゲノムインプリントを確立するために必要です
David N Ciccone1, Hui Su, Sarah Hevi
1Epigenetics Program, Novartis Institutes for Biomedical Research, 250 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Nature
|September 4, 2009
まとめ
リシン脱メチラーゼ1B (KDM1B) は,卵細胞発達の過程でDNAメチル化印をインプリントされた遺伝子に確立するために極めて重要です. 欠乏すると,マウスでは異常な遺伝子発現と胚の致死性が生じます.
科学分野:
- エピジェネティクス エピジェネティクス
- ゲノミクスゲノミクスとは
- 発達生物学 発達生物学について
背景:
- ゲノムインプリントは,差異的なDNAメチレーションを通じて,親の起源の特定の遺伝子発現を調節する.
- De novo DNAメチルトランスファーゼDNMT3AとDNMT3Lは,ゲメトゲネシス中にこれらのメチル化インプリントを確立するために不可欠です.
- de novoメチル化機構を,生殖系統の特定のインプリントされた位置にターゲットにする正確なメカニズムはまだ不明です.
研究 の 目的:
- アミン酸化酵素 (フラビンを含む) ドメイン1 (AOF1) の役割,リシン脱メチラーゼ1B (KDM1B) に改名された,生殖細胞DNAメチル化とゲノムインプリントの役割を調査する.
- 卵細胞におけるヒストンH3リジン4 (H3K4) 脱メチラーゼとしてのKDM1Bの機能を決定する.
主な方法:
- ネズミのKDM1B遺伝子を破壊するための遺伝子ターゲティング.
- KDM1B欠乏症の雌の卵細胞におけるH3K4メチル化レベルの分析.
- DNAメチル化インプリントとインプリントされた場所の遺伝子発現の評価,卵細胞および結果の胚.
主要な成果:
- KDM1Bは成長する卵細胞に高度に発現しており,インプリントの形成と一致しています.
- KDM1B欠乏症は,H3K4メチル化が増加し,いくつかのインプリントされた遺伝子でDNAメチル化マークを確立できませんでした.
- KDM1B欠乏性卵子細胞からの胚は,バイアレル性遺伝子発現/抑制を示し,妊娠中期前に死亡しました.
結論:
- KDM1BによるヒストンH3K4脱メチル化は,オオゲネシス中のDNAメチル化印の適切な確立に不可欠です.
- KDM1Bは,胚の発達に不可欠なインプリント遺伝子発現を調節する上で重要な役割を果たします.
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