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首页> 美国卫生研究院文献>Cell Bioscience >Breaking through a phylogenetic impasse: a pair of associated archaea might have played host in the endosymbiotic origin of eukaryotes
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Breaking through a phylogenetic impasse: a pair of associated archaea might have played host in the endosymbiotic origin of eukaryotes

机译：打破系统发育障碍：一对相关的古细菌可能在真核生物的内共生起源中发挥了作用

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摘要

For over a century, the origin of eukaryotes has been a topic of intense debate among scientists. Although it has become widely accepted that organelles such as the mitochondria and chloroplasts arose via endosymbiosis, the origin of the eukaryotic nucleus remains enigmatic. Numerous models for the origin of the nucleus have been proposed over the years, many of which use endosymbiosis to explain its existence. Proposals of microbes whose ancestors may have served as either a host or a guest in various endosymbiotic scenarios abound, none of which have been able to sufficiently incorporate the cell biological as well as phylogenetic data which links these organisms to the nucleus. While it is generally agreed that eukaryotic nuclei share more features in common with archaea rather than with bacteria, different studies have identified either one or the other of the two major groups of archaea as potential ancestors, leading to somewhat of a stalemate. This paper seeks to resolve this impasse by presenting evidence that not just one, but a pair of archaea might have served as host to the bacterial ancestor of the mitochondria. This pair may have consisted of ancestors of both Ignicoccus hospitalis as well as its ectosymbiont/ectoparasite ‘Nanoarchaeum equitans’.
机译：一个多世纪以来，真核生物的起源一直是科学家之间激烈辩论的话题。尽管通过内共生产生线粒体和叶绿体等细胞器已被广泛接受，但真核的起源仍然是个谜。多年来，已经提出了许多关于原子核起源的模型，其中许多模型使用共生来解释其存在。关于其祖先可能在各种共生共生情况中充当宿主或客体的微生物的提议比比皆是，没有一个方案能够充分整合将这些生物体与细胞核联系起来的细胞生物学和系统发育数据。尽管人们普遍认为真核与古细菌相比，细菌具有更多的共同特征，但不同的研究已将古细菌的两个主要类别中的一个或另一个确定为潜在祖先，导致某种程度的僵持。本文旨在通过提供证据证明不仅一个细菌，而且一对古细菌可能是线粒体细菌祖先的寄主，从而解决了这一僵局。这对可能由医院的伊格球菌及其外共生体/外寄生物“马氏古猿”的祖先组成。

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