ヘッジホッグ・シグナリングは,アネリドのプラチナネレスにおけるセグメント形成を調節する
Nicolas Dray1, Kristin Tessmar-Raible, Martine Le Gouar
1Centre de Génétique Moléculaire du CNRS, FRE 3144, Avenue de la Terrasse, 91189 Gif-sur-Yvette, France.
まとめ
ヘッジホッグのシグナル伝達経路は,節足類に似たアネリドのセグメント形成に関与しています. この発見は,これらの動物集団における体分割の共通の進化的起源を示唆している.
科学分野:
- 発達生物学 発達生物学について
- 進化生物学の進化生物学について
- 分子生物学は分子生物学である.
背景:
- アネリド類と節足類は断片化された体型を示しているが,この特性の進化的起源は完全に理解されていない.
- ヘッジホッグのシグナル伝達経路は,節足類のセグメントパターニングに不可欠ですが,他のセグメント動物におけるその役割は,ほとんど未知のままです.
研究 の 目的:
- アネリド Platynereis dumerilii.におけるヘッジホッグのシグナル伝達経路の機能を調査する.
- ヘッジホッグのシグナリングがアネリドのセグメント形成に作用するかどうかを判断し,それを関節足類における既知の機能と比較する.
主な方法:
- アネリドの発達中のヘッジホッグ経路成分 (ヘッジホッグリガンド,パッチド受容体,Gli転写因子) の発現パターンを調べました.
- 小分子阻害剤を使用して,ヘッジホッグの信号伝達を妨害し,セグメント形成への影響を観察しました.
主要な成果:
- ヘッジホッグ経路の構成要素は,Platynereis.で目に見えるセグメンテーションに先立つストライプ状のパターンで表現されていることが判明しました.
- ヘッジホッグのシグナル伝達の阻害は,アネリドのセグメント形成を妨害し,セグメント組織を維持する役割を示しています.
- Platynereis Hedgehogのシグナリングは,初期のセグメントパターンを維持するために不可欠ですが,確立することはできません.
結論:
- アネリドのセグメントパターニングにおけるヘッジホッグ経路の関与は,節足類と共に,セグメント化の共通の進化的起源の分子証拠を提供します.
- この研究は,原始体におけるセグメンテーションのための共通の祖先機構の仮説を支持する.
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