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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Molecular Phylogeny Of Choanoflagellates, The Sister Group To Metazoa
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Molecular Phylogeny Of Choanoflagellates, The Sister Group To Metazoa

机译：鞭毛虫的分子系统发育，后生的姐妹群

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摘要

Choanoflagellates are single-celled aquatic flagellates with a unique morphology consisting of a cell with a single f lagellum surrounded by a "collar" of microvilli. They have long interested evolutionary biologists because of their striking resemblance to the collared cells (choanocytes) of sponges. Molecular phylogeny has confirmed a close relationship between choanoflagellates and Metazoa, and the first choanoflagellate genome sequence has recently been published. However, molecular phylogenetic studies within choanoflagellates are still extremely limited. Thus, little is known about choanoflagellate evolution or the exact nature of the relationship between choanoflagellates and Metazoa. We have sequenced four genes from a broad sampling of the morphological diversity of choanoflagellates including most species currently available in culture. Phylogenetic analyses of these sequences, alone and in combination, reject much of the traditional taxonomy of the group. The molecular data also strongly support choanoflagellate monophyly rejecting proposals that Metazoa were derived from a true choanoflagellate ancestor. Mapping of a complementary matrix of morphological and ecological traits onto the phylogeny allows a reinterpretation of choanoflagellate character evolution and predicts the nature of their last common ancestor.
机译：鞭毛鞭毛虫是具有独特形态的单细胞水生鞭毛虫，由具有单个绒毛的细胞和被微绒毛“衣领”包围的细胞组成。他们一直对进化生物学家感兴趣，因为它们与海绵的衣领细胞（软骨细胞）惊人相似。分子系统发育学已经证实了鞭毛鞭毛虫和后生动物之间的密切关系，并且最近已经发表了第一个鞭毛鞭毛虫基因组序列。但是，鞭毛鞭毛虫内的分子系统发育研究仍然非常有限。因此，关于鞭毛鞭毛虫进化或鞭毛鞭毛虫与后生动物之间关系的确切性质所知甚少。我们从广泛的采样范围鞭毛鞭毛虫的形态多样性，包括目前在文化中可用的大多数物种，测序了四个基因。这些序列的系统发生分析，单独或组合使用时，拒绝了该组的许多传统分类法。分子数据也有力地支持了鞭毛鞭毛单生的拒绝，即后生动物起源于真正的鞭毛鞭毛祖先的提议。通过将形态和生态特征互补矩阵映射到系统发育上，可以重新解释鞭毛虫的性状进化，并预测它们最后一个祖先的性质。

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