A shared genetic basis of mimicry across swallowtail butterflies points to ancestral co-option of doublesex
A shared genetic basis of mimicry across swallowtail butterflies points to ancestral co-option of doublesex
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DOI：
10.1038/s41467-019-13859-y
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发表时间：
2020-01
影响因子：
16.6
通讯作者：
Daniela H. Palmer;M. Kronforst
中科院分区：
文献类型：
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作者：
Daniela H. Palmer;M. Kronforst
揭示趋同适应是否具有共同的遗传基础，对于理解表型多样性的进化具有重要意义。这些信息可以帮助我们了解共同祖先或独立进化在多大程度上塑造了适应性表型。在这项研究中，我们首先询问是否相同的基因是凤蝶多态模仿的基础。通过比较多态和单态物种之间的遗传变异特征，我们研究了祖先变异、杂交和独立进化如何影响这一群体的翅膀图案多样性。我们报道了一个单基因，双性（dsx），控制着多个分类群的模仿，但具有物种特异性的遗传分化模式和连锁不平衡。与普遍存在的由渗入驱动的表型进化的例子相反，我们的分析揭示了不同的模仿等位基因。我们得出的结论是，这一群体的模仿进化可能是由祖先多态性促进的，这是由于早期的共同选择了一个模仿位点，并且这些等位基因的进化转换可能是现存多态和单态谱系的翅膀模式多样性的基础。
Uncovering whether convergent adaptations share a genetic basis is consequential for understanding the evolution of phenotypic diversity. This information can help us understand the extent to which shared ancestry or independent evolution shape adaptive phenotypes. In this study, we first ask whether the same genes underlie polymorphic mimicry inPapilioswallowtail butterflies. By comparing signatures of genetic variation between polymorphic and monomorphic species, we then investigate how ancestral variation, hybridization, and independent evolution contributed to wing pattern diversity in this group. We report that a single gene,doublesex (dsx), controls mimicry across multiple taxa, but with species-specific patterns of genetic differentiation and linkage disequilibrium. In contrast to widespread examples of phenotypic evolution driven by introgression, our analyses reveal distinct mimicry alleles. We conclude that mimicry evolution in this group was likely facilitated by ancestral polymorphism resulting from early co-option ofdsxas a mimicry locus, and that evolutionary turnover ofdsxalleles may underlie the wing pattern diversity of extant polymorphic and monomorphic lineages.