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マクロスコプ的多細胞性の新たな進化
G Ozan Bozdag1, Seyed Alireza Zamani-Dahaj2,3, Thomas C Day3
1School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA. ozan.bozdag@gmail.com.
Nature
|May 10, 2023
まとめ
スノーフレーク酵母は バイオ物理的適応により 無酸素状態でマクロスケールに進化した. 酸素の利用可能性は 多細胞体の大きさと複雑さの進化に 決定的な影響を及ぼします
科学分野:
- 進化生物学
- バイオ物理学
- 微生物学
背景:
- 多細胞系は 単純な細胞群から ダーウィン的な実体へと進化します
- 持続的な多細胞進化を可能にする生体物理的メカニズムは十分に理解されていません.
研究 の 目的:
- 雪花酵母 (Saccharomyces cerevisiae) の長期実験を用いて多細胞性の進化を調査する.
- 多細胞の大きさと複雑さの進化における酸素の利用可能性の役割を決定する.
主な方法:
- スノーフレーク酵母でより大きなグループサイズを選択した長期進化実験を行いました.
- 3つの代謝処理を用いた. 無酸素,有酸素,および混合型.
- 600回以上の選択で サイズや生体強度 細胞形態の変化を分析した
主要な成果:
- アナエロビック・スノーフレイク・イーストはマクロスケール (ミリメートルスケール) に進化し,サイズが2×10^4倍,タフさが10^4倍になった.
- 無酸素状態でのマクロ進化は,細胞の伸びや枝の絡みなど,生理学的適応によって引き起こされた.
- 酸素が少ない環境下では 微小なもので 大きさが6倍にしか増えませんでした
結論:
- 酸素レベルは多細胞体の進化に不可欠です
- 細胞の伸びと絡み合いなどの生理学的適応は,多細胞の進化を継続的に促進する.
- この研究は,個性の進化的移行と,初期の多細胞生命における生体物理的限界の克服についての洞察を提供します.
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