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40の進化する酵母集団における広範囲にわたる遺伝的ヒッチハイクとクローン干渉
Gregory I Lang1, Daniel P Rice, Mark J Hickman
1Lewis-Sigler Institute for Integrative Genomics and Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544, USA. glang@lehigh.edu
Nature
|July 23, 2013
まとめ
進化的適応は,複数の変異がコホートで一緒に広がる遺伝的ヒッチハイクによって形成されます. このプロセスは,選択とともに,集団における進化の再現性に影響を与えます.
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
- 微生物の進化について
背景:
- 適応のダイナミクスを理解することは,抗生物質耐性,病原体の進化,がんの進行において極めて重要です.
- 実験室での進化実験では,しばしば,不明な役割を持つ他の変異と共に有益な変異を明らかにします.
研究 の 目的:
- 高時間解像度でゲノム配列進化のダイナミクスを調査する.
- 酵母菌の進化における遺伝的ヒッチハイクとクローン干渉の役割を調べる.
主な方法:
- 40の複製されたSaccharomyces cerevisiae集団の全ゲノム,全集団シーケンシング.
- 豊かな環境で1,000世代以上の進化をモニターする.
主要な成果:
- 広範囲にわたる遺伝的ヒッチハイクが観察され,突然変異は"コホート"で同期的に移動しました.
- 複数の競合するクローンコホートは,同じ集団内で頻繁に存在していました.
- 進化のパターンは,ストキャスティック・ヒッチハイク/干渉と決定的選択のバランスによるものです.
結論:
- 遺伝的ヒッチハイクとクローン干渉は,進化の軌跡にストキャスティシティを導入する.
- 選択は並列進化を推進するが,その結果は偶然の変異動態によって調節される.
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