ハグフィッシュの頭蓋骨面の発達と脊椎動物の進化
Yasuhiro Oisi1, Kinya G Ota, Shigehiro Kuraku
1Department of Biology, Graduate School of Science, Kobe University, Kobe 657-8501, Japan.
Nature
|December 21, 2012
まとめ
のない脊椎動物,ハグフィッシュ,ランプレイは,頭蓋骨顔面発達パターンを共有しています. これは,ハグフィッシュの特徴が二次的であることを示唆しており,このパターンは,祖先の脊椎動物の状態を表している可能性があります.
科学分野:
- 進化的発達生物学 進化的発達生物学
- 比較ゲノミクスとは
- 脊椎動物の古生物学について
背景:
- サイクロストーム (ホーグフィッシュとランプレイ) は,最も基礎的脊椎動物です.
- アデノヒポフィシスの起源のようなヘグフィッシュの特徴は,先祖状態を表すと考えられていた.
- 以前の研究では,ハグフィッシュの詳細な頭蓋骨顔面発達データが欠けていた.
研究 の 目的:
- ハグフィッシュの胚における頭蓋の顔面の発達を調査するために.
- ハグフィッシュのアデノヒポフィシスの起源を明らかにするために.
- ハグフィッシュの発達を他の脊椎動物と比較し,進化パターンを理解する.
主な方法:
- ステージ化したハグフィッシュの胚の胚学的分析.
- 顔と頭蓋骨の構造に関する比較解剖学的研究.
- 発達データに関する系統遺伝学的解釈.
主要な成果:
- ハグフィッシュのアデノヒポフィシスは,分子データと整合して,外皮で発生します.
- パンサイクロストームの頭蓋骨顔面発達パターンを特定しました.
- ハグフィッシュに特有の特徴は,おそらく二次的改変である.
結論:
- ハグフィッシュのアデノヒポフィシスの発達は,祖先の脊椎動物特質ではありません.
- サイクロストーム全体に共通する発達パターンが存在する.
- このパンサイクロストームパターンは,祖先の脊椎動物の面発達プログラムを反映している可能性があります.
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