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首页> 外文期刊>Chinese science bulletin >The c-myc coding DMA sequences of cyprinids (Teleostei: Cypriniformes): Implications for phylogeny
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The c-myc coding DMA sequences of cyprinids (Teleostei: Cypriniformes): Implications for phylogeny

机译：塞浦路斯的c-myc编码DMA序列（Teleostei：犬形目）：对系统发育的意义

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The family Cyprinidae is one of the largest fish families in the world, which is widely distributed in East Asian, with obvious difference in characteristic size among species. The phylogenetic analysis of cy-prinid taxa based on the functionally important genes can help to understand the speciation and functional divergence of the Cyprinidae. The c-myc gene is an important gene regulating individual growth. In the present study, the sequence variations of the cyprinid c-myc gene and their phylogenetic significance were analyzed. The 41 complete sequences of the c-myc gene were obtained from cyprinids and outgroups through PCR amplification and clone. The coding DMA sequences of the c-myc gene were used to infer molecular phylogenetic relationshipswithin the Cyprinidae. Myxocyprinus asiaticus (Catostomidae), Misgurnus anguillicaudatus (Cobitidae) and Hemimyzon sinensis (Homalopteridae) were assigned to the outgroup taxa. Phylogenetic analyses using maximum parsimony (MP), maximum likelihood (ML),and Bayesian retrieved similar topology. Within the Cyprinidae, Leuciscini and Barbini formed the monophyletic lineage respectively with high nodal supports. Leuciscini comprises Xeno-cyprinae, Cultrinae, East Asian species of Leuciscinae and Danioninae,Gobioninae and Acheilog-nathinae, and Barbini contains Schizothoracinae, Barbinae, Cyprininae and Labeoninae. Danio rerio, D. myersi and Rasbora trilineata were supposed to separate from Leuciscinae and Barbini and to form another lineage. The positionsof some Danioninae species were still unresolved. Analyses of both amino acid variation with parsimony information and two high variation regions indicated that there is no correlation between variations of single amino acid or high variation regions and characteristic size of cyprinids. In addition, the species with smaller size were usually found to be basal within clades in the tree, which might be the results of the adaptation to the primitive ecology and survival pressure.
机译：鲤科是世界上最大的鱼类科之一，广泛分布于东亚，物种间的特征大小差异明显。基于功能上重要的基因对cy-prinid类群的系统发育分析可以帮助了解cyprinidae的物种和功能差异。 c-myc基因是调节个体生长的重要基因。在本研究中，分析了塞浦路斯c-myc基因的序列变异及其系统发生意义。通过PCR扩增和克隆从鲤鱼和外群获得了41个完整的c-myc基因序列。 c-myc基因的编码DMA序列被用于推断与鲤科动物的分子系统发育关系。将亚洲粘虫（Catostomidae），鳗s（Misgurnus anguillicaudatus（Cobitidae）和中华半翅目（Hemimyzon sinensis）（Homalopteridae）分配到外群分类群中。使用最大简约（MP），最大似然（ML）和贝叶斯方法进行系统发育分析可检索到类似的拓扑。在鲤科动物中，Leuciscini和Barbini分别形成具有高结节支持的单系谱系。 Leuciscini包括Xeno cyprinae，Cultrinae，Leuciscinae和Danioninae的东亚种，Gobioninae和Acheilog-nathinae，Barbini包含Schizothoracinae，Barbinae，Cyprininae和Labeoninae。 Danio rerio，D。myersi和Rasbora trilineata应该与Leuciscinae和Barbini分离并形成另一个谱系。一些蒲公英属的物种的位置仍未解决。对具有简约信息的氨基酸变异和两个高变异区的分析表明，单个氨基酸或高变异区的变异与鲤科鱼的特征大小之间没有相关性。此外，较小的物种通常被发现是在树的进化枝的基部，这可能是适应原始生态和生存压力的结果。

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