Genomic Signatures of Speciation in Sympatric and Allopatric Hawaiian Picture-Winged Drosophila.
Genomic Signatures of Speciation in Sympatric and Allopatric Hawaiian Picture-Winged Drosophila.
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DOI：
10.1093/gbe/evw095
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发表时间：
2016-05-30
影响因子：
3.3
通讯作者：
Michalak P
中科院分区：
文献类型：
--
作者：
Kang L;Settlage R;McMahon W;Michalak K;Tae H;Garner HR;Stacy EA;Price DK;Michalak P
夏威夷群岛为理解适应性辐射和物种形成提供了一个天然的竞技场。夏威夷果蝇是夏威夷最具多样性的地方种群之一，有多达1,000种。我们对最近从夏威夷岛分离出来的夏威夷画翅果蝇、银翅果蝇和异脉果蝇的全基因组进行了测序和分析，并与它们在毛伊岛的姐妹种扁平果蝇进行了比较。毛伊岛是邻近的一个岛屿，这三种果蝇的共同祖先可能就在毛伊岛。全基因组单核苷酸多态性模式表明D. silvestris和D. heteroneura，以及积极的选择对三个物种的分歧的普遍影响，积极的选择的签名更突出的同域比allopatry。正选择基因的功能相关的感官检测和交配，这表明性选择发挥了重要作用，这些物种的物种形成显着丰富。特别是，嗅觉受体和味觉受体基因的序列变异似乎在夏威夷绘翅果蝇的适应性辐射中发挥了重要作用。
The Hawaiian archipelago provides a natural arena for understanding adaptive radiation and speciation. The Hawaiian Drosophila are one of the most diverse endemic groups in Hawaiì with up to 1,000 species. We sequenced and analyzed entire genomes of recently diverged species of Hawaiian picture-winged Drosophila, Drosophila silvestris and Drosophila heteroneura from Hawaiì Island, in comparison with Drosophila planitibia, their sister species from Maui, a neighboring island where a common ancestor of all three had likely occurred. Genome-wide single nucleotide polymorphism patterns suggest the more recent origin of D. silvestris and D. heteroneura, as well as a pervasive influence of positive selection on divergence of the three species, with the signatures of positive selection more prominent in sympatry than allopatry. Positively selected genes were significantly enriched for functional terms related to sensory detection and mating, suggesting that sexual selection played an important role in speciation of these species. In particular, sequence variation in Olfactory receptor and Gustatory receptor genes seems to play a major role in adaptive radiation in Hawaiian pictured-winged Drosophila.