蓝藻细菌中远红光光适应的演变
Laura A Antonaru1, Cecilia Rad-Menéndez2, Susan Mbedi3
1Department of Life Sciences, Imperial College London, London SW7 2AZ, UK; Institute for Experimental Physics, Freie Universität Berlin, 14195 Berlin, Germany.
Current biology : CB
|May 14, 2025
概括
蓝藻细菌的远红光光适应 (FaRLiP),涉及独特的叶绿素,可能在地球历史的早期出现. 这种古老的光合作用过程可能对早期的行星环境和生命产生了重大影响.
科学领域:
- 微生物学 微生物学
- 进化生物学 进化生物学
- 生物地质化学生物地质化学
背景情况:
- 菌通过氧化彻底改变了地球大气层,对全球碳和循环至关重要.
- 蓝藻细菌的一个子组表现出远红光光适应 (FaRLiP),利用红移 (d 和 f) 和专门的光合作用机器.
- FaRLiP基因的进化起源和早期环境联系在很大程度上是未知的.
研究的目的:
- 阐明蓝藻细菌中FaRLiP基因集群的起源和进化史.
- 为了研究远红光驱动光合作用在早期地球环境中的古老作用.
- 为了重建祖先的FaRLiP基因集群并了解其长期保护.
主要方法:
- 广泛挖掘基因组和元基因组数据以确定新的FaRLiP基因序列和集群.
- 使用多个基因树和基因排序保护分析的高分辨率系谱学.
- 遗传树网络分析以推断进化关系和祖先状态.
主要成果:
- 确定了600多个新的FaRLiP基因序列和51个新的基因集群,大大扩大了已知的多样性.
- 遗传学分析强烈支持FaRLiP在蓝藻细菌进化过程中的早期出现.
- 目前在现代微生物中观察到FaRLiP的多样性,这表明与微生物和 stromatolite 形成有关的一段悠久的历史.
- 对祖先FaRLiP星团的重建揭示了跨越数十亿年的保存特征.
结论:
- 该FaRLiP过程可能起源于蓝藻细菌进化的早期,可能是在古新生态时代.
- 远红光驱动的氧光合作用可能在地球早期的生物地球化学循环和可居住性中发挥了关键作用.
- 这项研究为理解这种独特的光合作用适应提供了高分辨率的进化框架.
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