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首页> 美国卫生研究院文献>Evolution Letters >Dont throw out the sympatric speciation with the crater lake water: fine‐scale investigation of introgression provides equivocal support for causal role of secondary gene flow in one of the clearest examples of sympatric speciation
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Dont throw out the sympatric speciation with the crater lake water: fine‐scale investigation of introgression provides equivocal support for causal role of secondary gene flow in one of the clearest examples of sympatric speciation

机译：不要用火山口湖水抛弃同胞形态：对同渗基因的精细研究为同基因形态最清晰的例子之一中的次生基因流的因果作用提供了模棱两可的支持。

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Genomic data has revealed complex histories of colonization and repeated gene flow previously unrecognized in some of the most celebrated examples of sympatric speciation and radiation. However, much of the evidence for secondary gene flow into these radiations comes from summary statistics calculated from sparse genomic sampling without knowledge of which specific genomic regions introgressed. This tells us little about how gene flow potentially influenced sympatric diversification. Here, we investigated whole genomes of Barombi Mbo crater lake cichlids for fine‐scale patterns of introgression with neighboring riverine cichlid populations. We found evidence of secondary gene flow into the radiation scattered across <0.24% of the genome; however, from our analyses, it is not clear if the functional diversity in these regions contributed to the ecological, sexual, and morphological diversity found in the lake. Unlike similar studies, we found no obvious candidate genes for adaptive introgression and we cannot rule out that secondary gene flow was predominantly neutral with respect to the diversification process. We also found evidence for differential assortment of ancestral polymorphisms found in riverine populations between sympatric sister species, suggesting the presence of an ancestral hybrid swarm. Although the history of gene flow and colonization is more complicated than previously assumed, the lack of compelling evidence for secondary gene flow's role in species diversification suggests that we should not yet rule out one of the most celebrated examples of sympatric speciation in nature without a more thorough investigation of the timing and functional role of each introgressed region.
机译：基因组数据揭示了殖民化的复杂历史和重复的基因流动，这在同胞物种形成和辐射的一些最著名的例子中以前是无法识别的。但是，许多次生基因流入这些放射线的证据来自根据稀疏基因组采样计算出的汇总统计信息，而无需了解哪些特定的基因组区域已渗入。这几乎没有告诉我们基因流动如何影响同胞多元化。在这里，我们调查了Barombi Mbo火山口湖丽鱼科鱼的整个基因组，以寻找与邻近河滨丽鱼科鱼的渗入的精细尺度模式。我们发现有证据表明次生基因流入散布在<0.24％基因组中的辐射中。但是，从我们的分析来看，尚不清楚这些区域的功能多样性是否有助于湖泊中的生态，性和形态多样性。与类似的研究不同，我们没有发现明显的适合基因渗入的候选基因，并且我们不能排除在多样化过程中次生基因流主要是中性的。我们还发现在同胞姐妹物种之间的河流种群中发现的祖先多态性差异分类的证据，表明存在祖先杂种群。尽管基因流动和定殖的历史比以前设想的要复杂，但是缺乏令人信服的证据证明次生基因流动在物种多样化中的作用表明，在没有更多证据的情况下，我们还不能排除自然界同胞形态最著名的例子之一。深入研究每个渗入区域的时间和功能作用。

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