A Similar Genetic Architecture Underlies the Convergent Evolution of the Selfing Syndrome in Capsella
A Similar Genetic Architecture Underlies the Convergent Evolution of the Selfing Syndrome in Capsella
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DOI：
10.1105/tpc.19.00551
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发表时间：
2020-04-01
期刊：
影响因子：
11.6
通讯作者：
Sicard, Adrien
中科院分区：
文献类型：
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作者：
Wozniak, Natalia Joanna;Kappel, Christian;Sicard, Adrien
荠菜属植物花瓣大小的独立进化缩小与基因表达的趋同进化有关，并以相似的遗传结构为基础，表型进化是否以及在多大程度上遵循可预测的遗传路径是进化生物学中的一个重要问题。相似性状的趋同进化为解决这一问题提供了一个独特的机会。向自交的过渡以及与之相关的花形态的变化是植物重复进化的最突出的例子。在这项研究中，我们利用独立的过渡到自交的属荠菜花性状的平行修改和测试的遗传和发育限制花的进化的背景下，自交综合征之间的相似性进行比较。荠菜rubella和荠菜orientalis出现独立，但演变几乎相同的花性状。不仅是进化的结果相同，但相同的发展战略的基础上收敛减少花的大小。这与基因表达变化的趋同进化有关。这两个自交系共同的转录组变化丰富的基因具有低网络连接和器官特异性表达模式。比较遗传图谱也表明，至少在花瓣大小进化的情况下，这些相似性具有相似的遗传基础。基于这些结果，我们假设，有限的可用性低多效性路径预先决定密切相关的物种相似的进化结果。
Independent evolutionary reductions of petal size in the genus Capsella are associated with convergent evolution of gene expression and underlain by similar genetic architectures.Whether, and to what extent, phenotypic evolution follows predictable genetic paths remains an important question in evolutionary biology. Convergent evolution of similar characters provides a unique opportunity to address this question. The transition to selfing and the associated changes in flower morphology are among the most prominent examples of repeated evolution in plants. In this study, we take advantage of the independent transitions to self-fertilization in the genus Capsella to compare the similarities between parallel modifications of floral traits and test for genetic and developmental constraints imposed on flower evolution in the context of the selfing syndrome. Capsella rubella and Capsella orientalis emerged independently but evolved almost identical flower characters. Not only is the evolutionary outcome identical but the same developmental strategies underlie the convergent reduction of flower size. This has been associated with convergent evolution of gene expression changes. The transcriptomic changes common to both selfing lineages are enriched in genes with low network connectivity and with organ-specific expression patterns. Comparative genetic mapping also suggests that, at least in the case of petal size evolution, these similarities have a similar genetic basis. Based on these results, we hypothesize that the limited availability of low-pleiotropy paths predetermines closely related species to similar evolutionary outcomes.