Engrailed-1は,脊椎動物の中脳発達におけるWnt-1信号経路の標的として使用されています
1Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
Nature
|September 26, 1996
まとめ
Wnt-1のシグナル伝達は,取り付けられた (En) 遺伝子発現を維持することによって,中枢神経系の発達に不可欠です. Wnt-1-nullマウス胚のEn-1発現を復元すると,中脳と後脳が発達し,Wnt-1/engrailedの相互作用が保存されていることが示される.
科学分野:
- 発達生物学 発達生物学とは
- 神経科学は神経科学である.
- 分子遺伝学 分子遺伝学
背景:
- Wnt-1遺伝子は,中枢神経系 (CNS) の発達に不可欠な分泌されたシグナル分子をコードする.
- Wnt-1-nullマウスの胚は,中脳と前後脳で発達障害を示しています.
- Engrailed (En) 遺伝子 (En-1, En-2) は,通常,影響を受けた中枢神経系の領域で発現する転写因子です.
研究 の 目的:
- 胚発達の過程で埋め込まれた遺伝子発現を維持する Wnt-1 信号伝達の役割を調査する.
- 中枢神経系の発達におけるWnt-1の機能が,埋め込まれた遺伝子との相互作用によって媒介されているかどうかを判断する.
- Wnt-1/engrailed相互作用経路の進化的保存を調査する.
主な方法:
- Wnt-1-nullマウス胚の分析について.
- ワイルド型およびWnt-1-null胚におけるゲノム (En-1, En-2) の発現分析.
- Wnt-1-null胚におけるEn-1発現の回復を伴う救助実験.
主要な成果:
- Wnt-1-null胚は中脳と前脳後脳の発達に障害を示しています.
- Wnt-1-null胚の発達中の中脳におけるEn-1の発現は,中脳と前後脳の早期発達を救うのに十分であった.
- この救出は,Wnt-1シグナリングがEn発現を維持していることを示しています.これは,これらの脳領域の発達に不可欠です.
結論:
- Wnt-1シグナリングは,遺伝子の発現を維持することによって,中枢神経系の発達に重要な役割を果たします.
- Wnt-1/engrailedの相互作用は,適切な中脳と前後脳形成に不可欠である.
- Wnt-1とengrailedを含むこの規制メカニズムは,ドロソフィラからマウスまで,種間で保存されています.
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