细菌生命树的约会基于古代的共生
Sishuo Wang1,2, Haiwei Luo1,3
1Simon F. S. Li Marine Science Laboratory, School of Life Sciences and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong SAR.
Systematic biology
|January 23, 2025
概括
这项研究使用古老的共生来校准细菌进化,估计最后一个细菌共同祖先 (LBCA) 出现于40亿至35亿年前. 这种新的时间尺度有助于理解早期生命进化和细菌多样化.
科学领域:
- 进化生物学 进化生物学
- 微生物基因组学 微生物基因组学
- 天体生物学 天体生物学
背景情况:
- 确定细菌的进化时间表对于了解早期生命至关重要,但由于缺乏化石证据而受到阻碍.
- 古代的共生关系为校准细菌进化提供了一个新的途径.
- 线粒体系系,在线粒体系上嵌入在蛋白质细菌中,提供了与真核生物化石记录的联系.
研究的目的:
- 通过利用古老的共生和真核生物化石数据,建立一个强大的细菌进化的时间表.
- 开发一个新的概率框架,以结合来自宿主-共生体协会的相对时间约束 (RTC).
- 通过先进的替代模型,完善细菌深层细菌的遗传学约会方法.
主要方法:
- 使用蛋白质细菌中的线粒体谱系基因构建细菌的遗传树.
- 应用来自真核化石年龄和宿主-共生体协会的19个RTC来限制细菌分歧时间.
- 开发和实施替代混合物模型,以解决基因分析中的替代和和组成异质性.
主要成果:
- 估计最后一个细菌共同祖先 (LBCA) 起源于大约40亿至35亿年前.
- 在LBCA之后,主要细菌菌株之间迅速分歧的观察.
- 通过各种分析参数证明获得的细菌进化时间尺度的稳定性.
结论:
- 开发的时间表为研究细菌多样化模式提供了关键的基础.
- 这种框架允许将细菌进化与重大地生物学事件相关联.
- 这项研究强调了古代共生在解决深层进化历史中的有用性.
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