Widespread adaptive evolution during repeated evolutionary radiations in New World lupins.
Widespread adaptive evolution during repeated evolutionary radiations in New World lupins.
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DOI：
10.1038/ncomms12384
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发表时间：
2016-08-08
影响因子：
16.6
通讯作者：
Filatov DA
中科院分区：
文献类型：
--
作者：
Nevado B;Atchison GW;Hughes CE;Filatov DA
人们对推动物种迅速多样化的进化过程知之甚少。特别是，目前还不清楚达尔文的适应或非适应过程是爆炸性物种多样化的主要驱动力。在这里，我们表明，在新世界羽扇豆（羽扇豆，豆科植物）内的重复快速辐射的基础上的编码和调节变化的适应频率大幅增加全基因组。这与缓慢多样化的羽扇豆和所有其他分析的植物属的基因组中的适应频率低得多形成对比。此外，最佳基因表达的广泛变化与多年生植物的高多样化和进化率的变化相吻合，这是一种公认的关键适应特征，被认为引发了新世界羽扇豆的进化辐射。我们的研究结果调和了长期以来关于蛋白质编码和调控进化的相对重要性的争论，并代表了在快速物种多样化过程中快速发生谱系和全基因组加速达尔文进化的第一个明确证据。 物种辐射可以由适应性和非适应性过程驱动，但这些驱动因素的相对重要性是未知的。在这里，Nevado等人表明，新世界羽扇豆中的多重辐射与编码和调节进化中的全基因组加速有关，这表明适应过程的强烈影响。
The evolutionary processes that drive rapid species diversification are poorly understood. In particular, it is unclear whether Darwinian adaptation or non-adaptive processes are the primary drivers of explosive species diversifications. Here we show that repeated rapid radiations within New World lupins (Lupinus, Leguminosae) were underpinned by a major increase in the frequency of adaptation acting on coding and regulatory changes genome-wide. This contrasts with far less frequent adaptation in genomes of slowly diversifying lupins and all other plant genera analysed. Furthermore, widespread shifts in optimal gene expression coincided with shifts to high rates of diversification and evolution of perenniality, a putative key adaptation trait thought to have triggered the evolutionary radiations in New World lupins. Our results reconcile long-standing debate about the relative importance of protein-coding and regulatory evolution, and represent the first unambiguous evidence for the rapid onset of lineage- and genome-wide accelerated Darwinian evolution during rapid species diversification. Species radiations can be driven by both adaptive and non-adaptive processes, but the relative importance of these drivers is unknown. Here, Nevado et al. show that multiple radiations in the New World lupins were associated with genome-wide accelerations in both coding and regulatory evolution, suggesting a strong influence of adaptive processes.