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The mitochondrial genome of the Basidiomycete fungus Pleurotus ostreatus (oyster mushroom)

机译：担子菌真菌pleurotus ostreatus（牡蛎蘑菇）的线粒体基因组

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In this study, the full mitochondrial genome of a basidiomycete fungus, Pleurotus ostreatus, was sequenced and analyzed. It is a circular DNA molecule of 73 242 bp and contains 44 known genes encoding 18 proteins and 26 RNA genes. The protein-coding genes include 14 common mitochondrial genes, one ribosomal small subunit protein 3 gene, one RNA polymerase gene and two DNA polymerase genes. In addition, one RNA and one DNA polymerase genes were identified in a mitochondrial plasmid. These two genes show relatively low similarities to their homologs in the mitochondrial genome but they are nearly identical to the known mitochondrial plasmid genes from another Pleurotus ostreatus strain. This suggests that the plasmid may mediate the horizontal gene transfer of the DNA and RNA polymerase genes into mitochondrial genome, and such a transfer may be an ancient event. Phylogenetic analysis based on the cox1 ORFs verified the traditional classification of Pleurotus ostreatus among fungi. However, the discordances were observed in the phylogenetic trees based on the six cox1 intronic ORFs of Pleurotus ostreatus and their homologs in other species, suggesting that these intronic ORFs are foreign DNA sequences obtained through HGT. In summary, this analysis provides valuable information towards the understanding of the evolution of fungal mtDNA. © 2008 Federation of European Microbiological Societies.
机译：在这项研究中，测序和分析了担子菌真菌平菇的完整线粒体基因组。它是一个73 242 bp的环状DNA分子，包含44个已知基因，编码18种蛋白质和26个RNA基因。蛋白质编码基因包括14个常见的线粒体基因，一个核糖体小亚基蛋白3基因，一个RNA聚合酶基因和两个DNA聚合酶基因。另外，在线粒体质粒中鉴定出一种RNA和一种DNA聚合酶基因。这两个基因与其在线粒体基因组中的同源物显示出相对较低的相似性，但它们与来自另一个平菇菌株的已知线粒体质粒基因几乎相同。这表明该质粒可以介导DNA和RNA聚合酶基因向线粒体基因组的水平基因转移，而这种转移可能是古老的事件。基于cox1 ORF的系统发育分析证实了平菇在真菌中的传统分类。但是，在基于平菇的六个cox1内含子ORF及其在其他物种中的同源物的系统发育树中观察到不一致，这表明这些内含子ORF是通过HGT获得的外源DNA序列。总而言之，该分析为了解真菌mtDNA的进化提供了有价值的信息。 ©2008欧洲微生物学会联合会。

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