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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Similarity of genes horizontally acquired by Escherichia coli and Salmonella enterica is evidence of a supraspecies pangenome
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Similarity of genes horizontally acquired by Escherichia coli and Salmonella enterica is evidence of a supraspecies pangenome

机译：大肠埃希菌和肠沙门氏菌水平获得的基因的相似性是超物种全基因组的证据

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摘要

Most bacterial and archaeal genomes contain many genes with little or no similarity to other genes, a property that impedes identification of gene origins. By comparing the codon usage of genes shared among strains (primarily vertically inherited genes) and genes unique to one strain (primarily recently horizontally acquired genes), we found that the plurality of unique genes in Escherichia coli and Salmonella enterica are much more similar to each other than are their vertically inherited genes. We conclude that E. coli and 5. enterica derive these unique genes from a common source, a supraspecies phylogenetic group that includes the organisms themselves. The phylogenetic range of the sharing appears to include other (but not all) members of the Enterobacteriaceae. We found evidence of similar gene sharing in other bacterial and archaeal taxa. Thus, we conclude that frequent gene exchange, particularly that of genetic novelties, extends well beyond accepted species boundaries.
机译：大多数细菌和古细菌基因组包含许多与其他基因几乎没有或没有相似性的基因，这种特性阻碍了基因起源的鉴定。通过比较菌株之间共享的基因（主要是垂直继承的基因）和一个菌株特有的基因（主要是最近水平获得的基因）的密码子使用情况，我们发现大肠杆菌和肠沙门氏菌中的多个独特基因彼此的相似性更高除了他们的垂直遗传基因。我们得出的结论是，大肠杆菌和小肠5.从共同来源衍生出这些独特的基因，这是包括生物体本身在内的超种系统发生群。共享的系统发育范围似乎包括肠杆菌科的其他（但不是全部）成员。我们在其他细菌和古细菌类群中发现了相似基因共享的证据。因此，我们得出结论，频繁的基因交换，尤其是遗传新奇的基因交换，已经远远超出了公认的物种边界。

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