社会遺伝子は,土壌微生物の親族群における選択ホットスポットである
Sébastien Wielgoss1, Rebekka Wolfensberger2, Lei Sun2
1Institute of Integrative Biology, Department of Environmental Systems Science, ETH Zürich, Zürich, Switzerland. sebastien.wielgoss@env.ethz.ch.
まとめ
Myxococcus xanthusのような 協力的なバクテリアのゲノム多様性は 社会的な進化を促します 果実体内の親族系は世代ごとに多様化し 共進化を促します
科学分野:
- 進化生物学
- 微生物生態学
- ゲノミクス
背景:
- 協力的なシステムは 微生物から動物まで その組成に基づいて進化します
- これらのシステム内のゲノム多様性は 進化の軌道を理解するのに不可欠です
- Myxococcus xanthusは協力的な細菌の進化を研究するモデルとして用いられる.
研究 の 目的:
- Myxococcus xanthusのゲノム多様性と社会現象との関係を調査する.
- 多細胞細菌構造 (果実体) の進化動態を理解する.
- 血統の多様化が社会的共進化にどのように影響するかを探求する.
主な方法:
- Myxococcus xanthusの自然分離物120種のゲノム変異の分析
- 単離体内の社会現象型変異の特徴づけ
- 6つの果実体の親族系における同義変異を用いた遺伝的差異の検討.
主要な成果:
- それぞれの果実体は 近年の共通の祖先から生まれた 複数の系統で構成されています
- ゲノム進化は社会的な現象型変化に結びついた 選択のホットスポットに集中していた.
- 果実体内の親族系は100世代以上前に分断され,長期の共存を示しています.
結論:
- 選択は協力的な細菌集団内の親族の多様化を促進する.
- Myxococcus xanthusにおける長期の局所的相互作用と固有の多様化は,社会的共進化を強める.
- ゲノム多様性を理解することは 協働システムの進化を解読する鍵です
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