Complete mitochondrial genome of Pleurocordyceps sinensis (Hypocreales, Ascomycota), a species with uncertain family-level taxonomic assignment

Yi Li, Jie Lin, Yong‐Hui Wang, Ke Wang, Ren Wang, Xinyue Zhao, Yi‐Jian Yao
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Abstract

The complete mitochondrial (mt) genome of the ex-type strain of Pleurocordyceps sinensis, a fungus originally isolated from Ophiocordyceps sinensis, was sequenced, and assembled as a single circular DNA of 31,841 bp. The mt genome encoded 15 conserved proteins (rps3, cox1, cox2, cox3, cob, atp6, atp8, atp9, nad1, nad2, nad3, nad4, nad4L, nad5, and nad6), 2 rRNA (rnl and rns), and 25 tRNA, as well as 10 additional non-conserved open reading frames (ncORFs). Comparative analyses showed that mt genomes within the order Hypocreales encoded the same number and synteny of conserved protein coding genes despite an obvious size variation among this group of fungi. Phylogenetic analyses using 14 conserved protein sequences revealed that this fungus may not belong to the current designated family Ophiocordycipitaceae but is more closely related to the species of Clavicipitaceae. The mt genome presented herein would give valuable information on reconstructing the evolutionary history of clavicipitaceous fungi and also aid in resolving the family-level taxonomic assignment of Polycephalomyces s. l. species.
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腹子囊菌科下creales中华冬虫夏草(Pleurocordyceps sinensis)的全线粒体基因组
对从冬虫夏草(Ophiocordyceps sinensis)中分离出来的一种真菌——冬虫夏草(Pleurocordyceps sinensis)前型菌株的线粒体全基因组进行了测序,并将其组装为一个长31841 bp的环状DNA。mt基因组编码15个保守蛋白(rps3、cox1、cox2、cox3、cob、atp6、atp8、atp9、nad1、nad2、nad3、nad4、nad4L、nad5和nad6)、2个rRNA (rnl和rns)、25个tRNA以及10个非保守开放阅读框(ncorf)。比较分析表明,尽管在这组真菌中存在明显的大小差异,但在下creales目的mt基因组中编码的保守蛋白编码基因的数量和合成是相同的。对14个保守蛋白序列的系统发育分析表明,该真菌可能不属于目前指定的Ophiocordycipitaceae,而与Clavicipitaceae的物种关系更近。本文提出的mt基因组将为重建锁骨真菌的进化史提供有价值的信息,也有助于解决多头菌属的科级分类分配问题。
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