レッドクイーンと走る:宿主-寄生体の共進化は双親性の性のために選択する

Levi T Morran¹, Olivia G Schmidt, Ian A Gelarden

¹Department of Biology, Indiana University, Bloomington, IN 47405, USA. lmorran@indiana.edu

Science (New York, N.Y.)

|July 9, 2011

まとめ

病原体との共進化は,Caenorhabditis elegans.の異種交配を促しています. 性繁殖のために選択された病原体は,自己種集団の絶滅を防止し,アウトクロス集団の生存を促進します.

科学分野:

進化生物学の進化生物学について
遺伝学遺伝学とは
微生物学微生物学とは

背景:

ほとんどの生物は,その大きなコストにもかかわらず,繁殖のためにアウトクロスを利用します.
レッドクイーン仮説は,共進化する病原体が選択的優位性を提供することによって,アウトクロス化を好むことを示唆しています.

研究の目的:

アウトクロス化を維持する病原体の役割に関するレッドクイーン仮説を実験的にテストする.
細菌病原体との共進化がCaenorhabditis elegansの生殖戦略に与える影響を調査する.

主な方法:

実験的な共進化は,Caenorhabditis elegansと細菌の病原体であるSerratia marcescens.を使用して採用されました.
混合交配の集団と強制的自給の集団は,共進化的圧力にさらされた.
異種交配率の変化と集団の持続性をモニタリングした.

主要な成果:

Serratia marcescensとの共進化は,Caenorhabditis elegansの混合交配集団におけるアウトクロス率を大幅に増加させました.
強制的自給の集団は,病原体駆動の共進化によって急速に絶滅した.
アウトクロスした集団は,病原体との相互の共進化によって持続性を示した.

結論:

この発見はレッドクイーン仮説を支持し,共進化する病原体が双親性の性 (アウトクロス) を選択できることを示している.
病原体主導の選択は,生殖コストに直面して,アウトクロッシング戦略の持続に不可欠です.

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