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

然而，最近一系列基于线粒体全基因组(有丝分裂组)序列的分子系统发育研究(Inoue等人，2003a，b，2004；Ishiguro，Miya&Nishida，2003；Miya等人，2003；Saitoh等人，2003)揭示了我们关于放线蕨类高级关系的概念。这6项研究加上前人的开创性工作(Chang，Huang&Lo，1994；Johansen&Bakke，1996，Miya&Nishida，1999,2000b；Noack，Zardoya&Meyer，1996；Saitoh等人，2000；Tzeng等人，1992；Zardoya，Garrido-Pertiera&Bautista，1995)一起在顺序水平上采集了放线蕨属所有主要谱系的样本，它们的数据集部分相互重叠。此外，它们都基于相同的严格同源特征集，没有可能像最近对放线蕨类核基因组所建议的那样，由于古代基因组重复(Martin&Burg，2002)而在样本基因之间进行平行比较(例如，Taylor等人，2003年；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，无论采用何种分析方法，许多基本分支都得到了很高的统计支持(见Simmons&Miya，2004年)。因此，整个有丝分裂组序列为研究放线蕨类的高级亲缘关系提供了一个新的综合视角，其中一部分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)。在这项研究中，我试图基于整个线粒体基因组序列来解析后变形的关系。首先，我利用102个放线蕨目的完整线粒体基因组序列，成功地证明了蟾鱼(蝙蝠形目)的系统发育位置(Miya等人，2005年)。我正在进一步分析包括336个放线翼状体虫的大型数据集，以正确地确定Percomoma的界限并解决它们的内部关系。分析已经使用两个并行计算系统进行，并将在今年内完成。较少

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