Mitochondrial genome evolution in Ophiuroidea, Echinoidea, and Holothuroidea: Insights in phylogenetic relationships of Echinodermata
Mitochondrial genome evolution in Ophiuroidea, Echinoidea, and Holothuroidea: Insights in phylogenetic relationships of Echinodermata
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DOI：
10.1016/j.ympev.2010.01.035
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发表时间：
2010-07-01
影响因子：
4.1
通讯作者：
Schlegel, Martin
中科院分区：
文献类型：
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作者：
Perseke, Marleen;Bernhard, Detlef;Schlegel, Martin
从半索动物门 (1)、蛇形目 (3)、海胆总目 (1) 和海参总目 (1) 的代表中确定了六个新的完整线粒体基因组的基因组结构和氨基酸序列，并与先前已知的序列一起进行了分析。系统发育分析恢复了棘皮动物中的三个谱系：海百合总科、蛇形总科和海参总科。 Echinoidea 和 Asteroidea。与之前对线粒体基因组的分析相反，增加的数据集使用半索动物外群代表在最大似然和贝叶斯分析中恢复了刺五加和棘动物门的经典棘皮动物系统发育。然而，脊椎动物外群以及最大简约和邻接重建中出现了不一致的分支。所有三个谱系的基础（一致）基因顺序可以通过每个谱系中的一次重排从假设的祖先海百合基因顺序导出。棘皮动物的基因组结构高度保守，而蛇形动物中检测到最高的基因顺序差异和大量未分配序列（UAS），这支持了比任何其他棘皮动物谱系更高的进化速率。蛇尾类基因组中基因顺序和 UAS 区域的变异性表明重复事件主导重排机制。 (C) 2010 Elsevier Inc. 保留所有权利。
The genome architecture and amino acid sequences of six new complete mitochondrial genomes were determined from representatives of Hemichordata (1), Ophiuroidea (3), Echinoidea (1) and Holothuroidea (1) and were analysed together with previously known sequences. Phylogenetic analyses recovered three lineages within echinoderms, Crinoidea, Ophiuroidea and a group comprising Holothuroidea. Echinoidea, and Asteroidea. In contrast to previous analyses of mitochondrial genomes the increased data set recovered the classical echinoderm phylogeny of Eleutherozoa and Echinozoa in Maximum Likelihood and Bayesian analyses using hemichordate out-group representatives. However, an inconsistent ramification appeared with vertebrate out-groups and in Maximum Parsimony and Neighbour Joining reconstructions.The basal (consensus) gene orders of all three lineages could be derived from a hypothetical ancestral crinoid gene order by one single rearrangement in each lineage. The genome architecture was highly conserved in Echinoidea, whereas the highest gene order differences and large amounts of unassigned sequences (UAS) were detected in Ophiuroidea, supporting a higher evolutionary rate than in any other echinoderm lineage. The variability in gene order and UAS regions in ophiuroid genomes suggest dominating rearrangement mechanisms by duplication events. (C) 2010 Elsevier Inc. All rights reserved.