Genome-wide patterns of divergence and gene flow across a butterfly radiation
Genome-wide patterns of divergence and gene flow across a butterfly radiation
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蝴蝶辐射中的全基因组分歧和基因流模式
DOI：
10.1111/j.1365-294x.2012.05730.x
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发表时间：
2012
影响因子：
4.9
通讯作者：
Nadeau N
中科院分区：
文献类型：
--
作者：
Nadeau N
Heliconius蝴蝶是一个多样化的最近的辐射，包括多个层次的分歧与物种之间正在进行的基因流。最近测序的Heliconius melpomene基因组使我们能够使用密集RAD标记测序来研究该组的基因组进化。对54个个体的系统发育分析结果表明，黑穗蝎和大蝎蝎的系统发育关系为相互单系，推翻了黑穗蝎可能与大蝎并系的假说。我们发现了同域种群的姐妹分支H. melpomene和H. cydno/timareta之间遗传混合的证据，特别是来自中美洲的H. cydno和H. melpomene之间以及来自安第斯山脉东坡的H. timareta和H. melpomene之间。种族之间，分歧主要是由隔离的距离，并没有检测到的遗传种群结构之间的parapatric种族，这表明种族之间的混合区是不是二次接触区。我们的研究结果也支持以前的研究结果，即颜色图案位点之间共享的种群和物种具有相似的颜色图案元素。此外，这种模式几乎是这些基因组区域所独有的，只有极少数其他基因座在具有相似颜色模式的种群和物种之间表现出显着的相似性。
TheHeliconiusbutterflies are a diverse recent radiation comprising multiple levels of divergence with ongoing gene flow between species. The recently sequenced genome ofHeliconius melpomeneallowed us to investigate the genomic evolution of this group using dense RAD marker sequencing. Phylogenetic analysis of 54 individuals robustly supported reciprocal monophyly ofH. melpomeneandHeliconius cydnoand refuted previous phylogenetic hypotheses thatH. melpomenemay be paraphylectic with respect toH. cydno.Heliconius timaretaalso formed a monophyletic clade closely related but distinct fromH. cydnowithHeliconius heurippafalling within this clade. We find evidence for genetic admixture between sympatric populations of the sister cladesH. melpomeneandH. cydno/timareta, particularly betweenH. cydnoandH. melpomenefrom Central America and betweenH. timaretaandH. melpomenefrom the eastern slopes of the Andes. Between races, divergence is primarily explained by isolation by distance and there is no detectable genetic population structure between parapatric races, suggesting that hybrid zones between races are not zones of secondary contact. Our results also support previous findings that colour pattern loci are shared between populations and species with similar colour pattern elements. Furthermore, this pattern is almost unique to these genomic regions, with only a very small number of other loci showing significant similarity between populations and species with similar colour patterns.