Evolution of nerve development in frogs. II. Modified development of the peripheral nervous system in the direct-developing frog Eleutherodactylus coqui (Leptodactylidae).
Evolution of nerve development in frogs. II. Modified development of the peripheral nervous system in the direct-developing frog Eleutherodactylus coqui (Leptodactylidae).
复制标题
青蛙神经发育的进化。
DOI：
10.1159/000113325
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Roth,G
中科院分区：
文献类型：
--
作者：
Schlosser,G;Roth,G
我们使用整体免疫组织化学来描述直接发育的细指蛙 Eleutherodactylus coqui 中脑神经和肌肉的发育模式。与双相发育的青蛙 Physalaemus pustulosus（Leptodactylidae）和 Discoglossus pictus（Discoglossus pictus；在配套论文中描述）中的神经发育进行比较，使我们能够推断出其祖先细指个体发育模式及其在直接发育进化过程中被修改的程度。而脑神经和肌肉的早期胚胎发育在E. 中显着保守。 coqui，大多数短暂的胚胎和幼虫特征（例如，枕骨和脊髓肌节及其神经支配，三叉神经和面神经的扭曲过程，腹侧鳃弓肌肉，鳃神经支的子集和侧线系统从未发育。然而，一些幼虫典型特征被重现，包括Rohon-Beard细胞以及迷走神经和舌下神经之间的吻合除了幼虫特有性状丧失而导致的个体发育缩短之外，在E. coqui中还可以观察到显着的分离和异时性转变。四肢和躯干神经支配的发育已经提前到早期胚胎阶段。此外，与双相发育的无尾动物中的晚期变态事件相对应的颅骨肌肉和神经的重新定向发生在E. coqui中相对更早并且不太明显。导致个体发育的极端凝结。
We use whole-mount immunohistochemistry to describe the pattern of development of cranial nerves and muscles in the direct-developing leptodactylid frogEleutherodactylus coqui.Comparison with nerve development in the biphasically developing frogsPhysalaemus pustulosus(Leptodactylidae) andDiscoglossus pictus(Discoglossidae; described in a companion paper) allows us to infer the ancestral leptodactylid ontogenetic pattern and the extent to which it has been modified during the evolution of direct development inEleutherodactylus.While early embryonic development of cranial nerves and muscles is remarkably conserved inE. coqui,most transitory embryonic and larval characters (e.g., occipital and spinal myotomes together with their innervation, the distorted course of trigeminal and facial nerves, ventral branchial arch muscles, a subset of branchial-nerve rami and the lateral-line system never develop. However, a few larva-typical characters are recapitulated, including Rohon-Beard cells and an anastomosis between the vagal and hypoglossal nerve. In addition to the abbreviation of ontogeny by loss of larva-specific traits, dramatic dissociations and heterochronic shifts of character can be observed inE. coqui.The onset of development of limb and trunk innervation has been pre-displaced to early embryonic stages. Moreover, the reorientation of cranial muscles and nerves corresponding to late metamorphic events in biphasically developing anurans occurs relatively much earlier and is less pronounced inE. coquiresulting in an extreme condensation of ontogeny.