Round and pointed-head grenadier fishes (Actinopterygii: Gadiformes) represent a single sister group: evidence from the complete mitochondrial genome sequences.
Round and pointed-head grenadier fishes (Actinopterygii: Gadiformes) represent a single sister group: evidence from the complete mitochondrial genome sequences.
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DOI：
10.1016/j.ympev.2006.02.014
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发表时间：
2006-07
影响因子：
4.1
通讯作者：
Takashi P. Satoh;M. Miya;Hiromitsu Endo;M. Nishida
中科院分区：
文献类型：
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作者：
Takashi P. Satoh;M. Miya;Hiromitsu Endo;M. Nishida
线粒体基因组（线粒体基因组）的基因顺序已被用作各种后生动物中有用的系统发育标记，因为它可能代表单系群体成员所共有的独特衍生特征。在基于整个线粒体基因组序列对鳕鱼目（鳕鱼及其近亲）进行分子系统发育研究的过程中，我们发现两种深海掷弹鱼（Squalogadus modificatus 和 Trachyrincus murryi：Macrouridae 科）揭示了异常相同的基因顺序（tRNALeu (UUR) 易位）。两者都是同一科的成员，尽管它们的外部形态差异很大（例如，圆头与尖头），以至于它们分别被分为不同的亚科 Macrouroidinae 和 Trachyrincininae。此外，我们还确定了另外两个物种 Bathygadus antrodes 和 Ventrifossa garmani 的完整线粒体基因组序列，代表目前在 Macrouridae 内识别的总共四个亚科。后两个物种也表现出基因重排，导致在四个亚科中观察到总共三种不同的独特基因顺序模式。使用来自五个大尿纲和五个外群的可用完整线粒体基因组序列进行分区贝叶斯分析。由此产生的树清楚地表明，S. modificatus 和 T. murryi 形成了一个单系群，与其他大尿科有姐妹关系。因此，两个不同的证据（核苷酸序列和基因顺序）证实了具有不同头部形态的两个物种的单系性。本树的整体拓扑不同于之前提出的任何基于形态学的系统发育假设。
The gene order of mitochondrial genomes (mitogenomes) has been employed as a useful phylogenetic marker in various metazoan animals, because it may represent uniquely derived characters shared by members of monophyletic groups. During the course of molecular phylogenetic studies of the order Gadiformes (cods and their relatives) based on whole mitogenome sequences, we found that two deep-sea grenadiers (Squalogadus modificatus and Trachyrincus murrayi: family Macrouridae) revealed a unusually identical gene order (translocation of the tRNALeu (UUR)). Both are members of the same family, although their external morphologies differed so greatly (e.g., round vs. pointed head) that they have been placed in different subfamilies Macrouroidinae and Trachyrincinae, respectively. Additionally, we determined the whole mitogenome sequences of two other species, Bathygadus antrodes and Ventrifossa garmani, representing a total of four subfamilies currently recognized within Macrouridae. The latter two species also exhibited gene rearrangements, resulting in a total of three different patterns of unique gene order being observed in the four subfamilies. Partitioned Bayesian analysis was conducted using available whole mitogenome sequences from five macrourids plus five outgroups. The resultant trees clearly indicated that S. modificatus and T. murrayi formed a monophyletic group, having a sister relationship to other macrourids. Thus, monophyly of the two species with disparate head morphologies was corroborated by two different lines of evidence (nucleotide sequences and gene order). The overall topology of the present tree differed from any of the previously proposed, morphology-based phylogenetic hypotheses.