A Common Endocrine Signature Marks the Convergent Evolution of an Elaborate Dance Display in Frogs
A Common Endocrine Signature Marks the Convergent Evolution of an Elaborate Dance Display in Frogs
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DOI：
10.1086/716213
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发表时间：
2021-10-01
影响因子：
2.9
通讯作者：
Fuxjager, Matthew J.
中科院分区：
文献类型：
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作者：
Anderson, Nigel K.;Schuppe, Eric R.;Fuxjager, Matthew J.
不相关的物种通常会针对相同的环境问题进化出相似的表型解决方案，这种现象称为趋同进化。但这些共同特征是如何产生的呢？我们从生理学的角度来解决这个问题，通过评估青蛙复杂的手势显示是如何收敛的，我们发现，这种罕见的显示在无关的无尾类类群的出现是由一个强大的增加在肌肉组织中的雄激素受体（AR）信使RNA的表达，驱动腿和脚的运动，但我们没有发现这些青蛙中枢神经系统中AR表达丰度变化的证据。与此同时，肌肉AR的进化变化幅度及其与足下垂起源的关联在分支之间存在差异，这表明这些变量以马赛克的方式一起进化。最后，虽然不同物种之间的手势显示确实不同，但脚下垂例程复杂性的变化并不能预测肌肉AR的差异。总而言之，这些发现表明，雄激素-肌肉相互作用为性展示行为的收敛提供了一个渠道，可能为运动表现的进化提供了一条阻力最小的路径。
Unrelated species often evolve similar phenotypic solutions to the same environmental problem, a phenomenon known as convergent evolution. But how do these common traits arise? We address this question from a physiological perspective by assessing how convergence of an elaborate gestural display in frogs (foot-flagging) is linked to changes in the androgenic hormone systems that underlie it. We show that the emergence of this rare display in unrelated anuran taxa is marked by a robust increase in the expression of androgen receptor (AR) messenger RNA in the musculature that actuates leg and foot movements, but we find no evidence of changes in the abundance of AR expression in these frogs' central nervous systems. Meanwhile, the magnitude of the evolutionary change in muscular AR and its association with the origin of foot-flagging differ among clades, suggesting that these variables evolve together in a mosaic fashion. Finally, while gestural displays do differ between species, variation in the complexity of a foot-flagging routine does not predict differences in muscular AR. Altogether, these findings suggest that androgen-muscle interactions provide a conduit for convergence in sexual display behavior, potentially providing a path of least resistance for the evolution of motor performance.