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Lateral gene transfers have polished animal genomes: lessons from nematodes

机译:横向基因转移具有优美的动物基因组:线虫的教训

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摘要

It is now accepted that lateral gene transfers (LGT), have significantly contributed to the composition of bacterial genomes. The amplitude of the phenomenon is considered so high in prokaryotes that it challenges the traditional view of a binary hierarchical tree of life to correctly represent the evolutionary history of species. Given the plethora of transfers between prokaryotes, it is currently impossible to infer the last common ancestral gene set for any extant species. For this ensemble of reasons, it has been proposed that the Darwinian binary tree of life may be inappropriate to correctly reflect the actual relations between species, at least in prokaryotes. In contrast, the contribution of LGT to the composition of animal genomes is less documented. In the light of recent analyses that reported series of LGT events in nematodes, we discuss the importance of this phenomenon in the evolutionary history and in the current composition of an animal genome. Far from being neutral, it appears that besides having contributed to nematode genome contents, LGT have favored the emergence of important traits such as plant-parasitism.
机译:现在已经公认,侧向基因转移(LGT)对细菌基因组的组成起了重要作用。在原核生物中,这种现象的幅度是如此之高,以至于挑战了传统的二元生命树的观点,以正确地表示物种的进化历史。鉴于原核生物之间的转移过多,目前尚无法推断出任何现存物种的最后一个共同祖先基因集。由于这种原因,有人提出,至少在原核生物中,达尔文的二叉树可能不适合正确地反映物种之间的实际关系。相比之下,LGT对动物基因组组成的贡献却鲜有记载。根据最近的报道线虫中一系列LGT事件的分析,我们讨论了这种现象在动物基因组的进化历史和当前组成中的重要性。 LGT不仅具有中立性,而且除了有助于线虫基因组含量外,还促进了植物寄生等重要性状的出现。

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