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Neurocranial development of the coelacanth and the evolution of the sarcopterygian head

机译：腔腔神经的发育和翼翅目的进化

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摘要

The neurocranium of sarcopterygian fishes was originally divided into an anterior (ethmosphenoid) and posterior (otoccipital) portion by an intracranial joint, and underwent major changes in its overall geometry before fusing into a single unit in lungfishes and early tetrapods(1). Although the pattern of these changes is well-documented, the developmental mechanisms that underpin variation in the form of the neurocranium and its associated soft tissues during the evolution of sarcopterygian fishes remain poorly understood. The coelacanth Latimeria is the only known living vertebrate that retains an intracranial joint(2,3). Despite its importance for understanding neurocranial evolution, the development of the neurocranium of this ovoviviparous fish remains unknown. Here we investigate the ontogeny of the neurocranium and brain in Latimeria chalumnae using conventional and synchrotron X-ray micro-computed tomography as well as magnetic resonance imaging, performed on an extensive growth series for this species. We describe the neurocranium at the earliest developmental stage known for Latimeria, as well as the major changes that the neurocranium undergoes during ontogeny. Changes in the neurocranium are associated with an extreme reduction in the relative size of the brain along with an enlargement of the notochord. The development of the notochord appears to have a major effect on the surrounding cranial components, and might underpin the formation of the intracranial joint. Our results shed light on the interplay between the neurocranium and its adjacent soft tissues during development in Latimeria, and provide insights into the developmental mechanisms that are likely to have underpinned the evolution of neurocranial diversity in sarcopterygian fishes.
机译：翼翅目鱼类的神经头颅最初通过颅内关节分为前部（乙类蝶形）和后部（耳枕）部分，并且在融合为单个单元后在肺鱼和早期四足动物中经历了整体几何学的重大变化（1）。尽管这些变化的模式已得到充分文献证明，但在opter翅目鱼类进化过程中支持神经颅及其相关软组织形式变化的发育机制仍知之甚少。腔棘鱼是唯一已知的保留颅内关节的活脊椎动物（2,3）。尽管它对于理解神经颅的进化很重要，但是这种卵生鱼的神经颅的发育仍然未知。在这里，我们使用常规和同步加速器X射线微计算机断层扫描以及磁共振成像技术（针对该物种的广泛生长系列）调查了Latimeria chalumnae中神经颅骨和大脑的个体发育。我们描述了在称为Latimeria的最早发育阶段的神经颅，以及神经颅在个体发育过程中经历的主要变化。神经颅骨的改变与大脑相对大小的极大减少以及脊索的扩大有关。脊索的发展似乎对周围的颅骨成分有重要影响，并可能支撑颅内关节的形成。我们的研究结果揭示了Latimeria发育过程中神经颅骨及其相邻软组织之间的相互作用，并提供了对可能支持sa翅鱼类神经颅多样性进化的发育机制的见解。

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  • 来源
    《Nature》 |2019年第7757期|556-559|共4页
  • 作者

    Dutel Hugo; Galland Manon; Tafforeau Paul; Long John A.; Fagan Michael J.; Janvier Philippe; Herrel Anthony; Santin Mathieu D.; Clement Gael; Herbin Marc;

  • 作者单位

    Univ Hull, Sch Engn & Comp Sci, Med & Biol Engn Res Grp, Kingston Upon Hull, N Humberside, England|Univ Bristol, Sch Earth Sci, Bristol, Avon, England;

    Univ Paris Diderot, UMR 7206, MNHN, CNRS,Ecoanthropol & Ethnobiol,Dept Homme & Enviro, Paris, France;

    European Synchrotron Radiat Facil, Grenoble, France;

    Flinders Univ S Australia, Coll Sci & Engn, Adelaide, SA, Australia;

    Univ Hull, Sch Engn & Comp Sci, Med & Biol Engn Res Grp, Kingston Upon Hull, N Humberside, England;

    Sorbonne Univ, UMR 7207, MNHN, CNRS,CR2P,Dept Origines & Evolut, Paris, France;

    MNHN, UMR 7179, CNRS, MECADEV,Dept Adaptat Vivant, Paris, France;

    Sorbonne Univ, INSERM, U1127, CNRS,UMR 7225,Ctr NeuroImaging Res,ICM Brain & Sp, Paris, France;

    Sorbonne Univ, UMR 7207, MNHN, CNRS,CR2P,Dept Origines & Evolut, Paris, France;

    MNHN, UMR 7179, CNRS, MECADEV,Dept Adaptat Vivant, Paris, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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