Regionalization, constraints, and the ancestral ossification patterns in the vertebral column of amniotes
Regionalization, constraints, and the ancestral ossification patterns in the vertebral column of amniotes
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DOI：
10.1101/2021.09.23.461462
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发表时间：
2021-09
影响因子：
4.6
通讯作者：
Antoine Verrière;N. Fröbisch;J. Fröbisch
中科院分区：
文献类型：
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作者：
Antoine Verrière;N. Fröbisch;J. Fröbisch
脊柱的发育已经在现代恐龙中得到了广泛的研究，但其进化历史的许多方面仍然是谜。在这里，我们扩大了现有的数据，在四个主要的脊椎发育模式的基础上保存非常完好的标本的早二叠世中龙科爬行动物Stereosternum：（i）椎体骨化，（ii）神经弓骨化，（iii）神经弓融合，（iv）神经中枢融合。我们追溯每一种模式的进化历史，并重建祖先的条件下，在Alpotes。尽管有3亿年的进化历史，脊椎发育模式显示出惊人的稳定性，因为它们的共同祖先。我们认为，这种保守主义可能与跨亚努科维奇的潜在发展过程所带来的限制。然而，我们也指出，哺乳动物和鸟类的祖先的条件比其他分支，这可能是一个更强的区域化列在这两个分支的不同。
The development of the vertebral column has been studied extensively in modern amniotes, yet many aspects of its evolutionary history remain enigmatic. Here we expand the existing data on four major vertebral developmental patterns in amniotes based on exceptionally well-preserved specimens of the early Permian mesosaurid reptile Stereosternum: (i) centrum ossification, (ii) neural arch ossification, (iii) neural arch fusion, and (iv) neurocentral fusion. We retrace the evolutionary history of each pattern and reconstruct the ancestral condition in amniotes. Despite 300 million years of evolutionary history, vertebral development patterns show a surprisingly stability in amniotes since their common ancestor. We propose that this conservatism may be linked to constraints posed by underlying developmental processes across amniotes. However, we also point out that mammals and birds differ more strongly from the ancestral condition than other clades, which might be linked to a stronger regionalization of the column in these two clades.