Mitochondrial Genomic Analysis of the Percomorph Fish Phytogenies : Resolving Polytomies Using Large Datasets

然而，最近一系列基于全线粒体基因组（有丝分裂基因组）序列的分子系统发育研究（Inoue et al.,2003a, b, 2004; Ishiguro, Miya & Nishida,2003; Miya et al.,2003; Saitoh et al.,2003）为我们对放光翼类高级关系的概念提供了新的视角。这六项有丝分裂基因组学研究加上之前的开创性工作（Chang, Huang & Lo, 1994; Johansen & Bakke, 1996; Miya & Nishida,1999,2000）； Noack, Zardoya & Meyer,1996； Saitoh等人，2000；Tzeng等人，1992;Zardoya, Garrido-Pertierra & Bautista,1995)，在顺序水平上对所有主要的放线虫谱系进行了采样，他们的数据集部分重叠。此外，它们都是基于同一组严格同源的性状，由于古老的基因组复制，没有可能在采样基因之间进行同源比较（Martin & Burg,2002），而放光翼类核基因组最近提出了这一建议（例如，Taylor等人，2003;Van de Peer, Tayl…More or & Meyer,2003）。此外，应该指出的是，由此产生的系统发育得到了很好的解决，许多基础分支无论采用何种分析方法，都得到了很高的统计支持（见Simmons & Miya， 2004）。因此，整个有丝分裂基因组序列提供了一个新的全面的视角来研究放光翼类动物之间的更高水平的关系，其中的一部分已经得到了最近基于不同标记的分子系统发育研究的支持（Chen, Bonillo & Lecointre,2003; Wiley, Johnson & Dimmick,2000）。例外的是Percomorpha关系，被称为“树顶的灌木”（Nelson, 1989）。在这项研究中，我试图在全线粒体基因组序列的基础上解决Percomorpha的关系。首先，我利用102种放光翼鱼的全线粒体基因组序列成功地证明了蟾鱼的系统发育位置（Batrachoidiformes目）（Miya et al., 2005）。我正在进一步分析包含336个放光蝶的大型数据集，以正确确定Percomorpha的限制并解决它们之间的关系。分析是用两个并行计算系统进行的，将在今年内完成。少

A series of recent molecular phylogenetic studies based on whole mitochondrial genome (mitogenome) sequences (Inoue et al.,2003a, b, 2004 ; Ishiguro, Miya & Nishida,2003 ; Miya et al., 2003 ; Saitoh et al., 2003), however, have shed a new light on our concepts of actinopterygian higher-level relationships. These six mitogenomic studies plus previous pioneering works (Chang, Huang & Lo, 1994 ; Johansen & Bakke, 1996,Miya & Nishida,1999,2000b ; Noack, Zardoya & Meyer,1996 ; Saitoh et al., 2000 ; Tzeng et al., 1992 ; Zardoya, Garrido-Pertierra & Bautista,1995) together sampled all major lineages of actinopterygians at the ordinal level, with their data sets partially overlapping each other. Also they were all based on the same sets of strictly homologous characters, with no potential for paralogous comparisons among sampled genes owing to ancient genome duplication (Martin & Burg,2002) as recently suggested for actinopterygian nuclear genomes (e.g., Taylor et al., 2003 ; Van de Peer, Tayl … More or & Meyer,2003). In addition, it should be noted that the resultant phylogenies were well resolved and many basal clades received high statistical support irrespective of analytical methods (see Simmons & Miya, 2004). Accordingly the whole mitogenome sequences have afforded a new comprehensive perspective on the higher-level relationships of actinopterygians, portions of which have been supported by recent molecular phylogenetic studies based on different markers (Chen, Bonillo & Lecointre,2003 ; Wiley, Johnson & Dimmick,2000). Exception to this is relationships of the Percomorpha, known as "bush at the top of the tree"(Nelson, 1989).In this study, I attempted at resolving relationships of the Percomorpha based on the whole mitochondrial genome sequences. First I successfully demonstrated a phylogenetic position of toadfish (order Batrachoidiformes) using whole mitochondrial genome sequences from 102 actinopterygians (Miya et al., 2005). I am further analyzing large datasets comprising 336 actinopterygians to correctly determine limits of the Percomorpha and resolve their intrarelationships. The analyses have been conducted using two parallel computing systems and will be finished within this year. Less