非人間的な遺伝学. 電気器官の収束進化のゲノム学的な基礎

Jason R Gallant¹, Lindsay L Traeger², Jeremy D Volkening³

¹Department of Zoology, Michigan State University, East Lansing, MI 48824, USA. BEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, MI 48824, USA.

Science (New York, N.Y.)

|June 28, 2014

まとめ

魚の電気器官の収束進化は,同様の遺伝経路を繰り返し利用しました. 異なる進化の経路にもかかわらず,電気魚の独立した系統は,重要な転写因子と発達過程を共有しています.

科学分野:

進化生物学の進化生物学について
ゲノミクスゲノミクスとは
比較生理学比較生理学とは

背景:

収束する特徴は,異なる種間で独立して進化する.
魚の肌性電気器は,6回独立して進化した.
収束進化の遺伝的基盤を理解することは極めて重要です.

研究の目的:

魚の電気器官における収束進化のゲノム基礎を調査する.
独立した電気器官進化の基礎となる遺伝的メカニズムを比較する.
電気器官の発達における共通の遺伝的要因を特定する.

主な方法:

エレクトリックアール (Electrophorus electricus) のゲノムアセンブリ.
3つの独立した系統からの電気器官と骨格筋のトランスクリプトーム配列化.
比較ゲノムおよびトランスクリプトーム分析.

主要な成果:

魚の電気器官の独立した進化は,同様の転写因子を利用しています.
共通の発達と細胞経路は,血統を越えて電気臓器形成に関与しています.
形態学的差異にもかかわらず,遺伝的基盤は収束を示しています.

結論:

電気器官のような複雑な特徴の収束進化は,保存された遺伝的ツールキットによって駆り立てられる.
同じような転写因子や経路は,電気器官の進化のために繰り返し採用されています.
この研究は,繰り返される進化的イノベーションの遺伝的根拠についての洞察を提供します.

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