ソニック・ヘッジホッグとFgf-4は,シグナリングカスケードとフィードバックループを通じて作用し,成長と発達中の四肢の芽のパターンを統合します
E Laufer1, C E Nelson, R L Johnson
1Department of Genetics Harvard Medical School, Boston, Massachusetts 02115.
Cell
|December 16, 1994
まとめ
ソニック・ヘッジホッグとFgf-4は,四肢の発達のための重要な信号です. 彼らはフィードバックループで相互作用し,ソニック・ヘッジホッグは二次信号を誘発し,Fgf-4はメソダームの反応を可能にします.
科学分野:
- 発達生物学 発達生物学とは
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 肢体の発達は,極化活動ゾーン (後部メソダーマ) とアピカル外皮脊 (AER) からのシグナル伝達に依存しています.
- Sonic hedgehog (Shh) とFibroblast growth factor-4 (Fgf-4) は,このプロセスにおける重要なシグナル伝達分子として特定されています.
研究 の 目的:
- 手足の早期発達におけるソニック・ヘッジホッグとFgf-4の特定の役割を解明する.
- これらのシグナル伝達分子とそれらの下流効果の間の規制相互作用を調査する.
主な方法:
- 発達中の四肢におけるソニック・ヘッジホッグとFgf-4の活動を外来的に調節するための外科的操作.
- 変化したシグナル伝達に対する反応として,遺伝子発現パターンとシグナル伝達経路の分析.
主要な成果:
- Sonic hedgehogは,メソダームのBmp-2とエクトダームのFgf-4を含む二次信号分子を直接誘導する.
- Fgf-4などの外皮性能力因子は,ソニック・ヘッジホッグへの反応として,中皮性遺伝子の活性化に不可欠です.
- 後部メソドームとAERの間のポジティブなフィードバックループは,Sonic hedgehogとFgf-4の表現を調整する.
結論:
- ソニック・ヘッジホッグとFgf-4は協調して機能し,四肢の成長とパターン形成を調節する.
- フィードバックループによって介されるShhとFgf-4の相互作用は,四肢発達中の成長とパターニング信号の統合に不可欠です.
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