The evolution of gastrulation morphologies.

The evolution of gastrulation morphologies.
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胃形态的演变。

DOI:
10.1242/dev.200885
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发表时间:
2023-04-01
期刊:
Development (Cambridge, England)
影响因子:
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在原肠胚形成期间,早期胚胎指定并重组其胚层的拓扑结构。令人惊讶的是,这一基本的早期过程似乎并没有受到进化压力的严格限制;相反,原肠胚形成的形态在整个动物王国中是高度可变的。最近的实验结果表明,在单个生物中,如在早期刺胞动物、节肢动物和脊椎动物胚胎中,有可能产生不同的替代原肠胚形成模式。在这里,我们回顾了脊椎动物原肠胚形成的可塑性的基础机制,无论是在实验操作和进化过程中。使用从这些实验中获得的见解,我们讨论了在卵黄体积的增加对原肠胚形成的形态的影响,并提供了新的见解到两个关键的创新,在古原肠胚形成:从一个环形的中胚层域的转变,从一个新月形的域在anaprootes,和进化的爬行动物blastoporal板/运河到鸟类的原始条纹。摘要:该假说回顾了脊椎动物原肠胚形成在进化过程中和实验操作下的可塑性的机制,并讨论了卵黄体积增加对原肠胚形成形态的影响。
During gastrulation, early embryos specify and reorganise the topology of their germ layers. Surprisingly, this fundamental and early process does not appear to be rigidly constrained by evolutionary pressures; instead, the morphology of gastrulation is highly variable throughout the animal kingdom. Recent experimental results demonstrate that it is possible to generate different alternative gastrulation modes in single organisms, such as in early cnidarian, arthropod and vertebrate embryos. Here, we review the mechanisms that underlie the plasticity of vertebrate gastrulation both when experimentally manipulated and during evolution. Using the insights obtained from these experiments we discuss the effects of the increase in yolk volume on the morphology of gastrulation and provide new insights into two crucial innovations during amniote gastrulation: the transition from a ring-shaped mesoderm domain in anamniotes to a crescent-shaped domain in amniotes, and the evolution of the reptilian blastoporal plate/canal into the avian primitive streak. Summary: This Hypothesis reviews the mechanisms that underlie the plasticity of vertebrate gastrulation during evolution and under experimental manipulation, and discusses the effects of the increase in yolk volume on the morphology of gastrulation.
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影响因子: --
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