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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
Published on: August 14, 2018
6遺伝子の系統遺伝を用いて,真菌の初期の進化を再構築する
Timothy Y James1, Frank Kauff, Conrad L Schoch
1Department of Biology, Duke University, Durham, North Carolina 27708-0338, USA. tyj2@duke.edu
Nature
|October 20, 2006
まとめ
菌類の進化は,泳ぐ胞子フラゲルの少なくとも4つの独立した喪失を示している. これらの損失は,新しい胞子分散方法と一致し,真菌の多様化に影響を与えました.
科学分野:
- ミコロジー菌類学
- 進化生物学の進化生物学について
- フィロジェネティクス フィルジェネティクス
背景:
- 菌類の祖先は水生生物で,鞭状の胞子があり,クイトリジオミコタ (クイトリド) に似ている.
- クイトリドは,早期に分裂した真菌群と考えられており,陸上の真菌の進化のために仮説化された単一のフラゲル喪失がある.
- これは,泳ぐ胞子を失うための単一の進化的イベントを暗示しています.
研究 の 目的:
- 菌類の進化史と胞子フラゲルム損失を調査する.
- 菌類王国のための堅実な系統遺伝的仮説を開発する.
- フラゲル喪失と胞子拡散メカニズムとの相関性を理解する.
主な方法:
- 6つの遺伝子領域を用いた系統遺伝学的分析.
- 約200種の真菌種を研究に含めた.
- 胞子形態学と分散戦略の比較分析.
主要な成果:
- 菌類内で少なくとも4つの独立の胞子フラゲル喪失を特定した.
- 鞭状の喪失が新種の胞子分散機構の進化と一致することを示した.
- 顕微粒子は,おそらく,エンド寄生キートリッドの祖先,おそらくRozella allomycis.から進化した.
結論:
- 菌類の進化には,泳ぐ胞子の複数の独立した喪失が含まれていた.
- 陸生菌と寄生菌の多様化は,新しい分散方法の適応に関連しています.
- マイクロスポリディアは,キットリッドの祖先から生まれた,真菌内の早期の分岐系統を表しています.
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