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寄生虫の多様性は宿主の適応と多様化を加速させる

A Betts1, C Gray2, M Zelek3

  • 1Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK. alex.betts@evobio.eu kayla.king@zoo.ox.ac.uk.

Science (New York, N.Y.)
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まとめ

多様な寄生虫のコミュニティは 宿主の進化を加速し 共同進化のダイナミクスを変動から 軍拡競争へと移行させます これは宿主の耐性を高め,寄生虫の感染性を低下させ,分子進化率に影響を与えます.

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科学分野:

  • 進化生物学
  • 微生物生態学
  • 寄生虫と宿主の相互作用

背景:

  • 宿主-寄生虫の共進化は 確立された現象です
  • 多数の寄生虫が宿主の共進化動態に与える影響は,ほとんど未知のままです.
  • これらの複雑な相互作用を理解することは 進化の軌道を予測するのに不可欠です

研究 の 目的:

  • 多様な寄生虫のコミュニティが 宿主の進化にどのように影響するかを調査する.
  • 寄生虫の多様性が共進化のダイナミクスに与える影響を 決定する.
  • 宿主耐性や寄生虫の感染性の変化を誘発するメカニズムを解明する.

主な方法:

  • 宿主細菌とそのウイルス寄生虫 (バクテリオファージ) を用いた実験的共進化.
  • 選択モードのシフトの分析 (変動対方向ダイナミクス).
  • リポポリサカライド遺伝子の遺伝子変異を特定し,耐性を与える.

主要な成果:

  • 寄生虫の多様性の増加は宿主の進化を加速し,宿主の耐性を高めました.
  • 寄生虫の多様性により 寄生虫の感染性が低下した.
  • 共同進化のダイナミクスはレッドクイーン (変動) から軍拡競争 (方向性) の選択へと移行した.
  • 軍拡競争のダイナミクスは,リポポリサカライド遺伝子における一般性抵抗性突然変異の選択的な掃討を伴う.
  • 宿主集団内のより速い分子進化と集団間のより大きな遺伝的差異が観察されました.

結論:

  • 多様な寄生虫コミュニティへの曝露は,宿主-寄生虫の共同進化の速度とタイプに大きな影響を与えます.
  • 寄生虫の多様性は 宿主への迅速な適応と 遺伝的差異を促すことができます
  • この発見は,進化論の研究におけるコミュニティレベルの相互作用を考慮する重要性を強調しています.