期刊
EVODEVO
卷 6, 期 -, 页码 -出版社
BMC
DOI: 10.1186/2041-9139-6-1
关键词
Ctenophore; Nervous system evolution; Cnidarian; Sponge; Trichoplax; Neuropeptide; Metazoan phylogeny; DEG/ENaC channels; MicroRNA; Ciliary photoreceptor
资金
- European Research Council under the European Union [260821]
- European Research Council (ERC) [260821] Funding Source: European Research Council (ERC)
Ctenophores have traditionally been treated as eumetazoans, but some recent whole genome studies have revived the idea that they are, rather, the sister group to all other metazoans. This deep branching position implies either that nervous systems have evolved twice, in Ctenophora and in Eumetazoa, or that an ancestral metazoan nervous system has been lost in sponges and placozoans. We caution, however, that phylogenetic-tree construction artifacts may have placed ctenophores too deep in the metazoan tree. We discuss nervous system origins under these alternative phylogenies and in light of comparative data of ctenophore and eumetazoan nervous systems. We argue that characters like neuropeptide signaling, ciliary photoreceptors, gap junctions and presynaptic molecules are consistent with a shared ancestry of nervous systems. However, if ctenophores are the sister group to all other metazoans, this ancestral nervous system was likely very simple. Further studies are needed to resolve the deep phylogeny of metazoans and to have a better understanding of the early steps of nervous system evolution.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据