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The Genomic Landscape of Divergence Across the Speciation Continuum in Island-Colonising Silvereyes (Zosterops lateralis).
G3: Genes, Genomes, Genetics ( IF 2.6 ) Pub Date : 2020-09-01 , DOI: 10.1534/g3.120.401352
Ashley T Sendell-Price 1 , Kristen C Ruegg 2, 3, 4 , Eric C Anderson 5 , Claudio S Quilodrán 2 , Benjamin M Van Doren 2 , Vinh L Underwood 3 , Tim Coulson 2 , Sonya M Clegg 2, 6
Affiliation  

Inferring the evolutionary dynamics at play during the process of speciation by analyzing the genomic landscape of divergence is a major pursuit in population genomics. However, empirical assessments of genomic landscapes under varying evolutionary scenarios that are known a priori are few, thereby limiting our ability to achieve this goal. Here we combine RAD-sequencing and individual-based simulations to evaluate the genomic landscape of divergence in the silvereye (Zosterops lateralis). Using pairwise comparisons that differ in divergence timeframe and the presence or absence of gene flow, we document how genomic patterns accumulate along the speciation continuum. In contrast to previous predictions, our results provide limited support for the idea that divergence accumulates around loci under divergent selection or that genomic islands widen with time. While a small number of genomic islands were found in populations diverging with and without gene flow, in few cases were SNPs putatively under selection tightly associated with genomic islands. The transition from localized to genome-wide levels of divergence was captured using individual-based simulations that considered only neutral processes. Our results challenge the ubiquity of existing verbal models that explain the accumulation of genomic differences across the speciation continuum and instead support the idea that divergence both within and outside of genomic islands is important during the speciation process.



中文翻译:

岛屿殖民化银眼(Zosteropslateralis)整个物种连续体中发散的基因组景观。

通过分析分歧的基因组格局来推断物种形成过程中起作用的进化动力学是种群基因组学的主要追求。但是,很少有先验已知在变化的进化场景下对基因组景观进行实证评估,从而限制了我们实现这一目标的能力。在这里,我们将RAD测序和基于个体的模拟相结合,以评估银眼(Zosteropslateralis)散度的基因组景观。)。使用差异时间框架和基因流存在与否不同的成对比较,我们记录了基因组模式如何沿物种连续体积累。与以前的预测相反,我们的结果为以下观点提供了有限的支持:在选择分歧下基因座周围会出现分歧,或者基因岛随着时间的推移而扩大。尽管在有和没有基因流的情况下,在少数群体中发现了基因组岛,但在少数情况下,假定选择的SNP与基因岛紧密相关。使用仅考虑中性过程的基于个体的模拟,可以捕获从局部水平到全基因组水平的差异。

更新日期:2020-09-02
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