The anteriorization of tooth position underlies the atavism of tooth morphology: Insights into the morphogenesis of mammalian molars
The anteriorization of tooth position underlies the atavism of tooth morphology: Insights into the morphogenesis of mammalian molars
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DOI：
10.1111/evo.14637
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发表时间：
2022-10-19
期刊：
影响因子：
3.3
通讯作者：
Asahara, Masakazu
中科院分区：
文献类型：
--
作者：
Harano, Tomohiro;Asahara, Masakazu
复杂臼齿的进化和发育作为哺乳动物的一个关键创新，长期以来一直受到人们的关注，但仍然知之甚少。参考百年的理论和现代发现，我们专注于鳍足类（食肉目）和鲸类（鲸偶蹄目）的牙齿，它们与其他哺乳动物的牙齿相比，在形态上比较简单，因此可以被认为是向非哺乳动物联会动物祖先状态的逆转。通过重建食肉目和鲸偶蹄目的牙齿复杂性的进化历史，我们建立了一个简单的牙齿从更复杂的臼齿的二次进化已经独立地发生了多次。我们的系统发育比较分析表明，牙齿形态的简化与更前的齿列位置相对于组成骨的上颌食肉目和鲸蹄类。这些结果表明，牙齿的位置相对于颌骨中存在的形态发生领域的前移有助于磨牙形态的进化简化。我们的研究结果提供了深入了解复杂的哺乳动物齿系的发育基础。
The evolution and development of complex molars as a key innovation in mammals have long been of interest yet remain poorly understood. With reference to century-old theories and modern findings, we focused on the teeth of pinnipeds (Carnivora) and cetaceans (Cetartiodactyla), which are morphologically simple compared with those of other mammals, and thus can be considered a reversal toward the ancestral state of nonmammalian synapsids. By reconstructing the evolutionary history of tooth complexity for the phylogenies of Carnivora and Cetartiodactyla, we established that a secondary evolution of simple teeth from more complex molars has occurred independently multiple times. Our phylogenetic comparative analyses showed that a simplification in tooth morphology was correlated with a more anterior dentition position relative to the component bones of the upper jaw in both Carnivora and Cetartiodactyla. These results suggest that the anterior shift of tooth position relative to the morphogenetic fields present in the jaw contributed to the evolutionary simplification in molar morphology. Our findings provide insights into the developmental basis of complex mammalian dentition.