Early evolution of the metazoa and phylogenetic status of diploblasts as inferred from amino acid sequence of elongation factor-1 alpha
Early evolution of the metazoa and phylogenetic status of diploblasts as inferred from amino acid sequence of elongation factor-1 alpha
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DOI：
10.1006/mpev.1996.0036
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发表时间：
1996-04-01
影响因子：
4.1
通讯作者：
Satoh, N
中科院分区：
文献类型：
--
作者：
Kobayashi, M;Wada, H;Satoh, N
为了了解后生动物的早期进化，有必要确定双胚层动物（多孔动物，刺胞动物和栉水母）的正确系统发育地位。尽管形态特征的分支研究和最近的分子系统发育研究，它仍然不确定是否diploblasts是单系或并系，以及如何这三门diploblasts是同源相关的。为了深入了解这些系统发育的问题，我们测序了几乎整个核酸序列的延伸因子-1 α从海绵，两个刺胞动物，栉水母，和Turbellarian。然后，我们调查了双胚细胞的系统发育状态。我们比较了氨基酸序列、第一和第二密码子位置的核苷酸序列以及第二位置的核苷酸序列。系统发育树的推断相邻连接，最大似然法，最大简约法，他们支持后生动物的单系性。然而，双胚层组的系统发育关系没有显着解决，虽然树木更喜欢的单系的双胚层。(C)出版社：Academic Press，Inc.
To understand the early evolution of the Metazoa, it is necessary to determine the correct phylogenetic status of diploblastic animals (poriferan, cnidaria, and ctenophora). Despite cladistic studies of morphological characters and recent molecular phylogenetic studies, it remains uncertain whether diploblasts are monophyletic or paraphyletic, and how these three phyla of diploblasts are phylogenetically related. To obtain insight into these phylogenetic problems, we sequenced almost the entire nucleic acid sequence of elongation factor-1 alpha from a sponge, two cnidarians, a ctenophora, and a turbellarian. We then investigated the phylogenetic status of the diploblasts. We compared the amino acid sequences, nucleotide sequences at the first and second codon positions, and those at the second positions. Phylogenetic trees were inferred by neighbor-joining, maximum likelihood, and maximum parsimony, and they supported the monophyly of the Metazoa. However, the phylogenetic relationships of the diploblast groups were not significantly resolved, although the trees preferred the monophyly of the diploblasts. (C) 1996 Academic Press, Inc.