The lamprey: a jawless vertebrate model system for examining origin of the neural crest and other vertebrate traits.
The lamprey: a jawless vertebrate model system for examining origin of the neural crest and other vertebrate traits.
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DOI：
10.1016/j.diff.2014.02.001
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发表时间：
2014-01
期刊：
影响因子：
--
通讯作者：
Bronner ME
中科院分区：
文献类型：
--
作者：
Green SA;Bronner ME
七鳃鳗是一组无颌鱼类，是脊椎动物进化研究的重要比较点。七鳃鳗和盲鳗都是环口鱼类，它们是颌类脊椎动物中唯一存活的姐妹类群，在系统发育中处于关键位置。比较环口动物和有颌脊椎动物可以帮助识别可能从祖先早期脊椎动物遗传而来的共同衍生（即突触性）特征，如果不太可能偶然收敛产生的话。脊椎动物特有特征的一个例子是神经嵴，这是一种胚胎组织，它产生许多对脊椎动物特征至关重要的细胞类型，如颅面骨骼、皮肤色素沉着和大部分周围神经系统。无脊椎脊索动物缺乏明确的神经嵴同源物，但有一些相似的细胞，这使得与七鳃鳗和有颌脊椎动物的比较对于推断早期脊椎动物的发育特征以及它们如何从无脊椎脊索动物进化而来至关重要。本文从七鳃鳗基因调控网络和神经嵴分化命运两方面综述了近年来环纹鱼神经嵴发育的研究进展。
Lampreys are a group of jawless fishes that serve as an important point of comparison for studies of vertebrate evolution. Lampreys and hagfishes are agnathan fishes, the cyclostomes, which sit at a crucial phylogenetic position as the only living sister group of the jawed vertebrates. Comparisons between cyclostomes and jawed vertebrates can help identify shared derived (i.e. synapomorphic) traits that might have been inherited from ancestral early vertebrates, if unlikely to have arisen convergently by chance. One example of a uniquely vertebrate trait is the neural crest, an embryonic tissue that produces many cell types crucial to vertebrate features, such as the craniofacial skeleton, pigmentation of the skin, and much of the peripheral nervous system. Invertebrate chordates arguably lack unambiguous neural crest homologs, yet have cells with some similarities, making comparisons with lampreys and jawed vertebrates essential for inferring characteristics of development in early vertebrates, and how they may have evolved from nonvertebrate chordates. Here we review recent research on cyclostome neural crest development, including research on lamprey gene regulatory networks and differentiated neural crest fates.