Co-option of wing-patterning genes underlies the evolution of the treehopper helmet
Co-option of wing-patterning genes underlies the evolution of the treehopper helmet
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DOI：
10.1038/s41559-019-1054-4
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发表时间：
2020-02-01
影响因子：
16.8
通讯作者：
Jockusch，Elizabeth L.
中科院分区：
文献类型：
--
作者：
Fisher，Cera R.;Wegrzyn，Jill L.;Jockusch，Elizabeth L.
理解新颖性的起源是进化发展生物学中的一个关键问题。在节肢动物中，体壁一直是形态新奇的反复来源。在树蝉中，背部体壁的一个祖先平坦的部分(前胸)被转化为一个三维结构(头盔)，然后通过自然选择将其塑造成不同的形状。在这里，我们通过比较树蝉和叶蝉的身体区域转录来检验头盔发育起源的三个假说，后者保留了更多的祖先形态。在叶蝉中，原腹侧基因的表达与其系列同源物--中胚层的基因表达最为相似。相比之下，在树跳虫中，头盔基因的表达与翅膀的基因表达最相似，支持了头盔起源的翅膀图案网络共选假说。这些结果表明，系列同源基因可能通过替换而不是修补它们祖先共享的图案网络而在进化上产生分歧。
Understanding the origin of novelty is a key question in evolutionary developmental biology. In arthropods, the body wall has served as a repeated source of morphological novelty. In treehoppers, an ancestrally flat part of the dorsal body wall (the pronotum) was transformed into a three-dimensional structure (the helmet), which was subsequently moulded by natural selection into diverse shapes. Here, we test three hypotheses for the developmental origin of the helmet by comparing body-region transcriptomes in a treehopper and a leafhopper that retains more ancestral morphology. In leafhoppers, pronotal gene expression is most similar to that of its serial homologue, the mesonotum. By contrast, in treehoppers, helmet gene expression is most similar to that of wings, supporting the wing-patterning network co-option hypothesis for the origin of the helmet. These results suggest that serial homologues may diverge evolutionarily through replacement of, rather than tinkering with, their ancestrally shared patterning network.