ヒストンH3ライシン36トリメチルトランスフェラーゼは,Nkx2-5をウルフ・ヒルシュホーン症候群と結びつける
Keisuke Nimura1, Kiyoe Ura, Hidetaka Shiratori
1Division of Gene Therapy Science, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka 565-0871, Japan.
Nature
|June 2, 2009
まとめ
ウルフ・ヒルシュホーン症候群候補1 (WHSC1) は,ヒストンH3トリメチル化をライシン36 (H3K36me3) で制御することによって,遺伝子発現を調節する. このエピジェネティックマークは,WHSC1欠乏が成長障害やウルフ・ヒルシュホーン症候群のような症状を引き起こすため,正常な発達に不可欠です.
科学分野:
- エピジェネティクス エピジェネティクス
- 発達生物学 発達生物学について
- 分子生物学は分子生物学である.
背景:
- ヒストンの改変は,重要な転写信号として機能する.
- リスイン36 (H3K36me3) でのヒストンH3トリメチル化は,活性転写と関連しているが,より高い真核生物におけるその調節と機能は不明である.
研究 の 目的:
- 高級ユカリオットにおけるH3K36me3の制御メカニズムと機能を調査する.
- 転写調節におけるウルフ・ヒルシュホーン症候群候補1 (WHSC1) の役割とそのウルフ・ヒルシュホーン症候群 (WHS) との関連を明らかにする.
主な方法:
- H3K36me3特異ヒストンメチルトランスファーゼ (HMTase) WHSC1をマウスモデルで研究した.
- WHSC1の転写因子Sall1,Sall4,Nanog,およびNkx2-5.5との関連性を調べました.
- Whsc1 欠乏したマウスと Nkx2-5 ヘテロジゴス変異体における遺伝子発現と発達のフェノタイプを分析した.
主要な成果:
- WHSC1は,細胞型特異の転写因子と相互作用することによって,ユークロマチン内のH3K36me3を制御する.
- WHSC1は,これらの転写因子に関連する標的遺伝子の発現を調節する.
- マウスのWhsc1欠乏症は,成長遅延と心血管異常を含むWHSのようなミッドラインの欠陥につながる.
結論:
- WHSC1は,発達の転写因子で機能し,遺伝子発現を調節し,異常転写を防止します.
- WHSC1は正常な発達において重要な役割を果たし,その機能不全はウルフ・ヒルシュホーン症候群の病理生理学と関連している.
- 心臓発達の文脈において,WHSC1とNkx2-5の間には機能的リンクが存在する.
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