Electrosensory ampullary organs are derived from lateral line placodes in cartilaginous fishes.
Electrosensory ampullary organs are derived from lateral line placodes in cartilaginous fishes.
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DOI：
10.1242/dev.084046
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发表时间：
2012-09
期刊：
影响因子：
--
通讯作者：
Baker CV
中科院分区：
文献类型：
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作者：
Gillis JA;Modrell MS;Northcutt RG;Catania KC;Luer CA;Baker CV
壶腹器官电感受器由弱阴极电场激发，用于软骨和非硬骨鱼类的狩猎。尽管神经生理学和神经支配的相似性，其胚胎起源仍然存在争议：硬骨鱼壶腹器官来自侧线基板，而神经嵴起源已被提出软骨鱼电感受器。这使人质疑两种有颌脊椎动物中电感受器和壶腹器官的同源性。在这里，我们测试的假设，侧线基板形成电感受器软骨鱼类进行第一次长期在体内的命运映射研究在任何软骨鱼类。使用DiI跟踪长达70天的小溜冰鞋，Leucoraja erinacea，我们表明，侧线基板形成壶腹电感受器和mechanosensory神经瘤。这些数据证实了软骨和非硬骨鱼类的电感受器和壶腹器官的同源性，并表明有颌脊椎动物具有侧线基板衍生系统的电感觉壶腹器官和mechanosensory neuromasts。
Ampullary organ electroreceptors excited by weak cathodal electric fields are used for hunting by both cartilaginous and non-teleost bony fishes. Despite similarities of neurophysiology and innervation, their embryonic origins remain controversial: bony fish ampullary organs are derived from lateral line placodes, while a neural crest origin has been proposed for cartilaginous fish electroreceptors. This calls into question the homology of electroreceptors and ampullary organs in the two lineages of jawed vertebrates. Here, we test the hypothesis that lateral line placodes form electroreceptors in cartilaginous fishes by undertaking the first long-term in vivo fate-mapping study in any cartilaginous fish. Using DiI-tracing for up to 70 days in the little skate, Leucoraja erinacea, we show that lateral line placodes form both ampullary electroreceptors and mechanosensory neuromasts. These data confirm the homology of electroreceptors and ampullary organs in cartilaginous and non-teleost bony fishes and indicate that jawed vertebrates primitively possessed a lateral line placode-derived system of electrosensory ampullary organs and mechanosensory neuromasts.