Recombination in thermotoga: Implications for species concepts and biogeography
Recombination in thermotoga: Implications for species concepts and biogeography
复制标题
DOI：
10.1534/genetics.105.049312
复制
发表时间：
2006-02-01
期刊：
影响因子：
3.3
通讯作者：
Doolittle, WF
中科院分区：
文献类型：
--
作者：
Nesbo, CL;Dlutek, M;Doolittle, WF
在这里，我们描述了超嗜热栖热袍菌属八个成员的基因组区域。这些细菌在生理上彼此不同，基因含量也有 3-20% 的差异，并且在全球不同的地区占据着不同的物理环境。在我们比较的四个不同谱系（由九个不同品系代表）中，没有两个谱系的基因平均序列接近于 96%。根据最近最被接受的定义，这些是不同的“生态型”和不同的“物种”。然而我们发现了令人信服的证据证明它们之间的重组。我们认为，没有一个单一的原核物种概念能够容纳这种生态型和遗传方面的凝聚力和多样性的解耦，并且如果没有一个单一的概念，原核物种是否总体上是世界性的问题就无法明智地解决。然而，我们可以根据基因及其等位基因的分布来重新审视生物地理学问题。
Here we characterize regions of the genomes of eight members of the hyperthermophilic genus Thermotoga. These bacteria differ from each other physiologically and by 3-20% in gene content and occupy physically distinct environments in widely disparate regions of the globe. Among the four different lineages (represented by nine different strains) that we compare, no two are closer than 96% in the average sequences of their genes. By most accepted recent definitions these are different "ecotypes" and different "species." And yet we find compelling evidence for recombination between them. We suggest that no single prokaryotic species concept can accommodate such uncoupling of ecotypic and genetic aspects of cohesion and diversity, and that without a single concept, the question of whether or not prokaryotic species might in general be cosmopolitan cannot be sensibly addressed. We can, however, recast biogeographical questions in terms of the distribution of genes and their alleles.