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双極性幼虫の前腸の進化について
D Arendt1, U Technau, J Wittbrodt
1European Molecular Biology Laboratory, Developmental Biology Programme, Meyerhofstrasse 1, 69012 Heidelberg, Germany.
Nature
|May 9, 2001
まとめ
ビラテリアの幼虫の腸の進化は,共通の祖先に保存された構造を示唆しています. Platynereis dumeriliiからの分子データは,初期のバイラテリアンには,その主要な幼虫に三部位腸があったことを示しています.
科学分野:
- 発達生物学 発達生物学とは
- 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:
- ビラテリアは,プロトストミアとデュテロストミアに分かれ,幼虫の腸の発達が異なっている.
- 両群のプライマリー・ラバは,シリアー・ロコモーションによる間接的な発達を示す.
- プロトストームとデウテロストームの幼虫における管状の腸の独立した進化は,支配的な仮説である.
研究 の 目的:
- ビラテリアの幼虫の腸発達の進化的起源を調査する.
- プロトストミアとデュテロストミアにおける幼虫の腸の独立した進化の仮説を検証する.
- Platynereis dumerilii trochophoraの幼虫の遺伝子発現パターンを分析するために.
主な方法:
- プラティネリス・ドゥメリリイ (Platynereis dumerilii) の同類遺伝子の発現 (ブラキウリ,オトックス,グースコイド) の分析
- 遺伝子発現パターンをデュテロストミア幼虫の既知のデータと比較.
- プロトストームの代表的な幼虫として,ポリケータ Platynereis dumerilii に焦点を当てる.
主要な成果:
- プラティネリスの幼虫のブラキューリとオックス遺伝子の発現は,デュテロストミア・プライマリー幼虫のそれと並行しています.
- プラティネリスの前腸におけるグースコイドの表情は,より高いデウテロストミアにおけるその機能を反映している.
- 分子証拠は,幼虫の前腹部と口部領域の進化的保存を支持しています.
結論:
- この研究は,プロトストミアとデュテロストミアの間にある幼虫の前腸と口部の保存に関する分子証拠を提供します.
- これらの発見は,幼虫の腸の独立した進化の仮説に異議を唱える.
- データは,共通の双胞胎の祖先であるUrbilateriaが,その主要な幼虫に三部管状の腸を持っていたことを示唆しています.
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