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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Ecological and evolutionary dynamics of coexisting lineages during a long-term experiment with Escherichia coli
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Ecological and evolutionary dynamics of coexisting lineages during a long-term experiment with Escherichia coli

机译：大肠杆菌长期实验中共存世系的生态和进化动力学

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摘要

Closely related organisms usually occupy similar ecological niches, leading to intense competition and even extinction. Such competition also can promote rapid phenotypic evolution and ecological divergence. This process may end with the stable occupation of distinct niches or, alternatively, may entail repeated bouts of evolution. Here we examine two Escherichia coli lineages, called L and S, that coexisted for more than 30,000 generations after diverging from a common ancestor. Both lineages underwent sustained phenotypic evolution based on global transcription and resource utilization profiles, with L seeming to encroach over time on the catabolic profile of S. Reciprocal invasion experiments with L and S clones from the same or different generations revealed evolutionary changes in their interaction, including an asymmetry that confirmed the encroachment by L on the niche of the S lineage. In general, L and S clones from the same generation showed negative frequency-dependent effects, consistent with stable coexistence. However, L clones could invade S clones from both earlier and later generations, whereas S clones could invade only L clones from earlier generations. In this system, the long-term coexistence of competing lineages evidently depended on successive rounds of evolution, rather than on initial divergence followed by a static equilibrium.
机译：密切相关的生物通常占据类似的生态位，导致激烈的竞争甚至灭绝。这种竞争还可以促进表型的快速发展和生态差异。该过程可能以稳定地占据不同的生态位而告终，或者可能需要反复进行进化。在这里，我们研究了两个称为L和S的大肠埃希氏菌谱系，它们在与一个共同祖先分离后共存在了30,000多代。两种谱系都根据全局转录和资源利用状况进行了持续的表型进化，L似乎随着时间的推移侵占了S的分解代谢谱。使用来自相同或不同世代的L和S克隆的相互入侵实验揭示了它们相互作用的进化变化，包括一个不对称性，该不对称性证实了L对S谱系利基的侵占。通常，来自同一世代的L和S克隆显示负频率依赖性效应，与稳定的共存一致。但是，L克隆可以入侵早期和后代的S克隆，而S克隆只能入侵早期世代的L克隆。在这个系统中，竞争血统的长期共存显然取决于进化的连续轮回，而不是取决于最初的分歧和随后的静态平衡。

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  • 作者

    Mickael Le Gac; Jessica Plucain; Thomas Hindre; Richard E.Lenski; Dominique Schneider;

  • 作者单位

    Laboratoire Adaptation et Pathogenie des Microorganismes, Institut Jean Roget, Universite Joseph Fourier, F-38041 Grenoble, France,Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5163, F-38041 Grenoble, France;

    Laboratoire Adaptation et Pathogenie des Microorganismes, Institut Jean Roget, Universite Joseph Fourier, F-38041 Grenoble, France,Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5163, F-38041 Grenoble, France;

    Laboratoire Adaptation et Pathogenie des Microorganismes, Institut Jean Roget, Universite Joseph Fourier, F-38041 Grenoble, France,Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5163, F-38041 Grenoble, France;

    Department of Microbiology and Molecular Genetics,BEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, Ml 48824;

    Laboratoire Adaptation et Pathogenie des Microorganismes, Institut Jean Roget, Universite Joseph Fourier, F-38041 Grenoble, France,Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5163, F-38041 Grenoble, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    experimental evolution; frequency-dependent selection; gene expression;

    机译：实验进化频率选择基因表达;

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