The Genome of the "Great Speciator" Provides Insights into Bird Diversification.
The Genome of the "Great Speciator" Provides Insights into Bird Diversification.
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DOI：
10.1093/gbe/evv168
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发表时间：
2015-09-02
影响因子：
3.3
通讯作者：
Savolainen V
中科院分区：
文献类型：
--
作者：
Cornetti L;Valente LM;Dunning LT;Quan X;Black RA;Hébert O;Savolainen V
在鸟类中，白眼(带状脊椎动物属)的多样性如此广泛，以至于贾里德·戴蒙德和恩斯特·迈尔将它们称为“伟大的生物。”在脊椎动物中，带状脊椎动物的物种多样性速度是最快的，其成员是最多产的雀形目动物岛屿殖民者。我们提出了一个高质量的银眼(Zosteroplateralis)基因组组装，这是一个由分布在多个岛屿上的几个亚种组成的白眼物种。我们通过在不同的分类学水平上进行基因组分析来研究白眼快速多样化的遗传基础。首先，我们将银眼的基因组与不同科的鸟类的基因组进行比较，并寻找可能是Zosterops所独有的基因组特征。其次，我们比较了利福岛(南太平洋)不同物种的白眼鱼的基因组，使用全基因组重测序和限制性内切酶相关DNA。第三，我们对比了两个不同羽色的银眼亚种的基因组。根据理论，我们证明了相对于其他鸟类，白眼具有较高的替换率、基因复制率和正向选择率。在属水平以下，我们发现基因组分化迅速积累，并揭示了利福同域物种之间不同的人口历史，表明了过去的种间相互作用。最后，我们强调了可能与银眼亚种之间的颜色多态有关的基因。通过为白眼提供第一个全基因组序列资源，并通过在不同的分类水平上进行分析，我们提供了支持这种非凡的鸟类辐射的基因组证据。
Among birds, white-eyes (genus Zosterops) have diversified so extensively that Jared Diamond and Ernst Mayr referred to them as the “great speciator.” The Zosterops lineage exhibits some of the fastest rates of species diversification among vertebrates, and its members are the most prolific passerine island colonizers. We present a high-quality genome assembly for the silvereye (Zosterops lateralis), a white-eye species consisting of several subspecies distributed across multiple islands. We investigate the genetic basis of rapid diversification in white-eyes by conducting genomic analyses at varying taxonomic levels. First, we compare the silvereye genome with those of birds from different families and searched for genomic features that may be unique to Zosterops. Second, we compare the genomes of different species of white-eyes from Lifou island (South Pacific), using whole genome resequencing and restriction site associated DNA. Third, we contrast the genomes of two subspecies of silvereye that differ in plumage color. In accordance with theory, we show that white-eyes have high rates of substitutions, gene duplication, and positive selection relative to other birds. Below genus level, we find that genomic differentiation accumulates rapidly and reveals contrasting demographic histories between sympatric species on Lifou, indicative of past interspecific interactions. Finally, we highlight genes possibly involved in color polymorphism between the subspecies of silvereye. By providing the first whole-genome sequence resources for white-eyes and by conducting analyses at different taxonomic levels, we provide genomic evidence underpinning this extraordinary bird radiation.