NURFのPHD指はヒストンH3ライシン4トリメチル化とクロマチンの改造を組み合わせている
Joanna Wysocka1, Tomek Swigut, Hua Xiao
1Laboratory of Chromatin Biology.
Nature
|May 27, 2006
まとめ
ヒストンライシンメチル化,特にH3K4me3は,活性遺伝子転写に不可欠です. この研究では,NURF複合体がH3K4me3と直接結合し,クロマチンのリモデリングとホックス遺伝子発現維持を結びつけることが明らかになりました.
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.
- 発達生物学 発達生物学とは
背景:
- ヒストンのライシンメチル化は,重要な表遺伝的メカニズムである.
- ヒストンH3ライシン4トリメチル化 (H3K4me3) は,活性遺伝子転写開始部位をマークする.
- WDR5は,世界的なH3K4me3レベルとHOX遺伝子発現に影響を与える.
研究 の 目的:
- NURF複合体とH3K4me3.3の相互作用を調査する.
- 染色体調節と遺伝子発現におけるNURFサブユニットBPTFの役割を明らかにする.
- WDR5とNURFの機能的関係を理解するために,in vivo.
主な方法:
- NURF複合体のPHD指とH3K4me3.3の直接的な関連性を調査しました.
- H3K4me3の枯渇を活用して,BPTFの染色体結合とSNF2Lの徴募に影響を観察した.
- ホックス遺伝子発現におけるその役割を評価するために,Xenopus胚におけるBPTF機能を調べました.
主要な成果:
- NURF複合体のPHD指はH3K4me3.3に直接結合する.
- H3K4me3の枯渇は,染色体からBPTFの放出につながり,SNF2Lの徴募が妨げられます.
- Xenopus胚のBPTFの喪失は,WDR5の喪失をフェノコピーし,空間的なホックス遺伝子発現を妨害する.
結論:
- WDR5とNURFは,ホックス遺伝子発現を維持するために共通の経路で動作します.
- NURF媒介のクロマチンの改造は,H3K4トリメチル化と直接結合しています.
- PHD指は,メチル・ライシン結合領域として機能する.
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