ソニック・ヘッジホッグのコレステロール変異は,長距離信号活動と,Ptc1による信号伝達の効果的な調節のために必要である
P M Lewis1, M P Dunn, J A McMahon
1Department of Molecular and Cellular Biology, The Biolabs, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA.
Cell
|June 8, 2001
まとめ
ソニック・ヘッジホッグ (Shh) のコレステロール変化は,脊椎動物の四肢発達の過程で,そのシグナル伝達範囲にとって極めて重要です. このリポフィリックタグは,適切な前後パターンと受容体相互作用を保証します.
科学分野:
- 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.
- 遺伝学 遺伝学とは
背景:
- Sonic hedgehog (Shh) は,極化活動 (ZPA) の後部ゾーンから信号を送り,脊椎動物の肢体における前後極性を決定する.
- Shhは自己処理を行い,コレステロールをそのN端のシグナリング部分 (N-Shh(p) と結合して細胞膜に結合させ,コレステロールをそのN端のシグナリング部分 (N-Shh(p) と結合させます.
研究 の 目的:
- Shh媒介によるマウス指のパターンの形成におけるコレステロール変化の役割を調査する.
- リポフィルの改変がShh信号範囲と受容体の相互作用にどのように影響するかを理解するために.
主な方法:
- ネズミの四肢発達モデルにおけるN-Shh(p) 分布と生物学的活性に関する分析.
- コレステロール改変型N-Shh (p) と未改変型N-Shh.との信号伝達特性の比較.
主要な成果:
- コレステロールによって改変されたN-Shh (p) は,より広範な分布と活動範囲を示し,数百ミクロン以上で作用します.
- 未修正のN-Shhは同様の生物学的活性を示しているが,後部信号伝達に限定されている.
- コレステロールの修正は,正常なShh信号範囲とPtc1受容体の調節のために不可欠です.
結論:
- Shhの脂質変異は,四肢のパターニングに必要な適切なシグナルグラデーションを確立するために重要である.
- コレステロールタグは,Shhのシグナリング範囲を拡張し,発達する四肢における正しい前後軸形成を保証します.
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The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
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