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首页> 外文期刊>Mycologia >Neolecta - a fungal dinosaur? Evidence from beta-tubulin amino acidsequences
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Neolecta - a fungal dinosaur? Evidence from beta-tubulin amino acidsequences

机译：Neolecta-真菌恐龙？ β-微管蛋白氨基酸序列的证据

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摘要

Were the first ascomycetes yeast-like (unicellular) or filamentous with complex multicellular growths Molecular studies have indicated that the earliest lineages of ascomycetes were mostly yeast-like and without complex, multicellular fruit bodies. The genus Neolecta stands out as an exception. Neolecta spp. have filamentous growth and discomycete-type of fruit bodies, but constitute one of the basal lineages both in rRNA and RPB2 gene trees. In this paper, we have used 10 previously unpublished and 30 GenBank beta -tubulin genes to test the phylogenetic position of Neolecta spp. We compared the phylogenetic information from the amino acid sequences (485 characters) with the phylogenetic information content of 33 characters from intron gains and losses. Due to gene duplications, two paralogous versions of beta -tubulin genes occurred in four species included in our analysis. Although phylogenetic interpretation of beta -tubulin gene trees was complicated by a history of gene duplications, intron gains and losses, and by unequal rates of amino acid substitution, Neolecta species never formed a monophyletic group with any of the sequences from the filamentous ascomycetes in the Pezizomycotina (euascomycetes) in parsimony or distance analyses. Like the RPB2 and rRNA genes, the P-tubulin genes support the hypotheses of an early divergence of Neolecta from superficially similar filamentous ascomycetes. Neolecta could become a key taxon particularly in comparative studies between the fungal model organisms in the mainly unicellular (=yeast-like) taxa Saccharomyces and Schizosaccharomyces and the filamentous fruit-body forming taxa Neurospora and Aspergillus.
机译：是最早的类酵母菌是酵母样的（单细胞）或丝状，具有复杂的多细胞生长分子研究表明，最早的子囊菌谱系是酵母样的，并且没有复杂的多细胞子实体。 Neolecta属例外。 Neolecta spp。具有丝状的生长和盘状的子实体，但构成rRNA和RPB2基因树的基础谱系之一。在本文中，我们使用了10个先前未发表的基因和30个GenBankβ-微管蛋白基因来测试Neolecta spp的系统发生位置。我们比较了氨基酸序列（485个字符）的系统发育信息和内含子得失33个字符的系统信息。由于基因重复，我们分析中的四个物种中出现了两个类似的β-微管蛋白基因。尽管β-微管蛋白基因树的系统发育解释由于基因复制，内含子获得和损失以及氨基酸置换率不平等的历史而变得复杂，但Neolecta菌种从未与来自丝状子囊菌的任何序列形成单系群。简约或距离分析中的古猿。类似于RPB2和rRNA基因，P-微管蛋白基因支持Neolecta与表面类似的丝状子囊菌早期分化的假说。 Neolecta可能成为关键的分类单元，尤其是在主要是单细胞（=酵母样）分类单元的酿酒酵母和裂殖酵母和真菌形成的丝状果体分类单元Neurospora和Aspergillus的真菌模型生物之间的比较研究中。

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