Contrasting signatures of genomic divergence during sympatric speciation.
Contrasting signatures of genomic divergence during sympatric speciation.
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DOI：
10.1038/s41586-020-2845-0
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发表时间：
2020-12
期刊：
影响因子：
64.8
通讯作者：
Meyer A
中科院分区：
文献类型：
--
作者：
Kautt AF;Kratochwil CF;Nater A;Machado-Schiaffino G;Olave M;Henning F;Torres-Dowdall J;Härer A;Hulsey CD;Franchini P;Pippel M;Myers EW;Meyer A
从单一物种的“标记明确的品种”到“定义明确的物种”的转变--特别是在基因流动没有地理障碍的情况下（同域物种形成）--自达尔文以来一直困扰着进化生物学家。基因流动抵消了全基因组分化的积累，这是物种形成的标志，并增加了完成物种形成过程的不可逆生殖障碍（不相容性）进化的可能性。理论预测，不同选择性状的遗传结构可以影响同域物种形成是否发生，但这一理论的实证检验很少，因为由于其独特的生物学和进化历史，很难收集和综合跨物种的全面数据。在这里，在一个新热带区丽鱼（双鳍鱼属）的年轻物种复合体中，我们分析了种群和物种之间的基因组差异。通过生成一个新的基因组组装和重新测序453个基因组，我们揭示了被认为对分歧很重要的性状的遗传结构。不同物种的单基因或寡基因性状，影响生态性能和/或配偶选择显着本地化的基因组分化。相比之下，在多基因性状上分化的物种之间的分化在基因组上是普遍的，并且总体上更高，这与有效和稳定的基因组范围内的基因流动障碍的进化是一致的。因此，我们的结论是，简单的性状架构并不总是有利于物种形成与基因流如前所述，而多基因架构可以促进快速和稳定的物种形成在同域。种群基因组分析表明，Midas慈鲷鱼在年轻的Xuan火山口湖泊同域物种形成的多基因架构。
The transition from ‘well-marked varieties’ of a single species into ‘well-defined species’—especially in the absence of geographic barriers to gene flow (sympatric speciation)—has puzzled evolutionary biologists ever since Darwin. Gene flow counteracts the buildup of genome-wide differentiation, which is a hallmark of speciation and increases the likelihood of the evolution of irreversible reproductive barriers (incompatibilities) that complete the speciation process. Theory predicts that the genetic architecture of divergently selected traits can influence whether sympatric speciation occurs, but empirical tests of this theory are scant because comprehensive data are difficult to collect and synthesize across species, owing to their unique biologies and evolutionary histories. Here, within a young species complex of neotropical cichlid fishes (Amphilophus spp.), we analysed genomic divergence among populations and species. By generating a new genome assembly and re-sequencing 453 genomes, we uncovered the genetic architecture of traits that have been suggested to be important for divergence. Species that differ in monogenic or oligogenic traits that affect ecological performance and/or mate choice show remarkably localized genomic differentiation. By contrast, differentiation among species that have diverged in polygenic traits is genomically widespread and much higher overall, consistent with the evolution of effective and stable genome-wide barriers to gene flow. Thus, we conclude that simple trait architectures are not always as conducive to speciation with gene flow as previously suggested, whereas polygenic architectures can promote rapid and stable speciation in sympatry. Population genomic analyses of Midas cichlid fishes in young Nicaraguan crater lakes suggest that sympatric speciation is promoted by polygenic architectures.
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影响因子：
3.7
作者：
Derrien T;Estellé J;Marco Sola S;Knowles DG;Raineri E;Guigó R;Ribeca P
通讯作者：
Ribeca P
影响因子：
3.1
作者：
Chen, Honglei;Lu, Rong;Sun, Jun
通讯作者：
Sun, Jun
影响因子：
3.3
作者：
Elmer, Kathryn R.;Lehtonen, Topi K.;Meyer, Axel
通讯作者：
Meyer, Axel
影响因子：
9.3
作者：
Durand NC;Shamim MS;Machol I;Rao SS;Huntley MH;Lander ES;Aiden EL
通讯作者：
Aiden EL
影响因子：
4.4
作者：
Conte MA;Gammerdinger WJ;Bartie KL;Penman DJ;Kocher TD
通讯作者：
Kocher TD