Cnidarian phylogenetic relationships as revealed by mitogenomics.
Cnidarian phylogenetic relationships as revealed by mitogenomics.
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DOI：
10.1186/1471-2148-13-5
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发表时间：
2013-01-09
影响因子：
3.4
通讯作者：
Lavrov DV
中科院分区：
文献类型：
--
作者：
Kayal E;Roure B;Philippe H;Collins AG;Lavrov DV
线虫(珊瑚、海葵、水母、水母)是一门相对简单的水生动物，其特征是存在线虫：一种含有巨大的囊状细胞器和可倾倒的小管的细胞。Cnidaria内的物种的生活史涉及两种不同的身体形式中的一种或两种，典型的底栖息肉，可能是殖民地的，也可能不是殖民地的，以及典型的水母，通常是水母，主要是独居的。目前被接受的分类方案将线虫划分为两个主要组合：珊瑚虫(Hexorallia + Occorallia)--有生殖性息肉，没有水母阶段的线虫--和水母纲(立方动物、水母纲、水母纲、柱状动物)--通常具有生殖水母阶段的线虫。这些分类群之间的假设关系极大地影响了对西尼迪亚属特征进化的解释。我们扩大了线虫线粒体基因组的样本，特别是来自水母纲的线粒体基因组，以重新评估线虫属内的系统发育关系。我们基于线粒体基因组数据集的系统发育分析支持许多先前的假设，包括六射珊瑚亚纲、十珊瑚亚纲、水母亚纲、立方亚纲、柱状动物亚纲、水母亚纲、石首亚纲、水母亚纲和水母亚纲，但拒绝珊瑚亚纲的单系进化，这表明十珊瑚亚纲 + 水母纲关系不是先前提出的采样偏差的结果。此外，我们的分析与水母类[Discomedusae + Coronatae]、Acraspeda[Cubozoa + Scyphzoa]以及柱虫是所有其他水母类的姐妹群的假设相矛盾。脊椎动物的线粒体基因组数据包含了有助于了解该门的进化史的系统发育信号。基于有丝分裂组的系统发育排除了珊瑚虫的单系性，为息肉优先假说提供了进一步的证据。通过拒绝传统的Acraspeda和Scyphzoa假说，这些分析表明，这些类群的共同形态特征是多形性，起源于通往水母纲的分支。随着有丝分裂组数据的扩展以及系统发育推断方法的改进和额外核标记的使用，将进一步加深我们对蛇床子属内系统发育关系和特征进化的理解。
Cnidaria (corals, sea anemones, hydroids, jellyfish) is a phylum of relatively simple aquatic animals characterized by the presence of the cnidocyst: a cell containing a giant capsular organelle with an eversible tubule (cnida). Species within Cnidaria have life cycles that involve one or both of the two distinct body forms, a typically benthic polyp, which may or may not be colonial, and a typically pelagic mostly solitary medusa. The currently accepted taxonomic scheme subdivides Cnidaria into two main assemblages: Anthozoa (Hexacorallia + Octocorallia) – cnidarians with a reproductive polyp and the absence of a medusa stage – and Medusozoa (Cubozoa, Hydrozoa, Scyphozoa, Staurozoa) – cnidarians that usually possess a reproductive medusa stage. Hypothesized relationships among these taxa greatly impact interpretations of cnidarian character evolution. We expanded the sampling of cnidarian mitochondrial genomes, particularly from Medusozoa, to reevaluate phylogenetic relationships within Cnidaria. Our phylogenetic analyses based on a mitochogenomic dataset support many prior hypotheses, including monophyly of Hexacorallia, Octocorallia, Medusozoa, Cubozoa, Staurozoa, Hydrozoa, Carybdeida, Chirodropida, and Hydroidolina, but reject the monophyly of Anthozoa, indicating that the Octocorallia + Medusozoa relationship is not the result of sampling bias, as proposed earlier. Further, our analyses contradict Scyphozoa [Discomedusae + Coronatae], Acraspeda [Cubozoa + Scyphozoa], as well as the hypothesis that Staurozoa is the sister group to all the other medusozoans. Cnidarian mitochondrial genomic data contain phylogenetic signal informative for understanding the evolutionary history of this phylum. Mitogenome-based phylogenies, which reject the monophyly of Anthozoa, provide further evidence for the polyp-first hypothesis. By rejecting the traditional Acraspeda and Scyphozoa hypotheses, these analyses suggest that the shared morphological characters in these groups are plesiomorphies, originated in the branch leading to Medusozoa. The expansion of mitogenomic data along with improvements in phylogenetic inference methods and use of additional nuclear markers will further enhance our understanding of the phylogenetic relationships and character evolution within Cnidaria.
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一个独特的水平基因转移事件为八角形的线粒体基因组提供了活跃的不匹配修复基因，该基因具有异常的独立功能。
影响因子：
3.4
作者：
Bilewitch JP;Degnan SM
通讯作者：
Degnan SM
影响因子：
4.1
作者：
Berntson, EA;France, SC;Mullineaux, LS
通讯作者：
Mullineaux, LS
影响因子：
3
作者：
Chen, Chienhsun;Chiou, Chih-Yung;Chen, Chaolun Allen
通讯作者：
Chen, Chaolun Allen
影响因子：
6.5
作者：
Collins, AG;Schuchert, P;Schierwater, B
通讯作者：
Schierwater, B
影响因子：
3.9
作者：
Brugler, Mercer R.;France, Scott C.
通讯作者：
France, Scott C.