Mitochondrial Genome Fragmentation Unites the Parasitic Lice of Eutherian Mammals.
Mitochondrial Genome Fragmentation Unites the Parasitic Lice of Eutherian Mammals.
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线粒体基因组碎片将eutherian哺乳动物的寄生虱子团结起来。
DOI：
10.1093/sysbio/syy062
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发表时间：
2019-05-01
影响因子：
6.5
通讯作者：
Shao R
中科院分区：
文献类型：
--
作者：
Song F;Li H;Liu GH;Wang W;James P;Colwell DD;Tran A;Gong S;Cai W;Shao R
细胞器基因组片段化已被发现在广泛的真核细胞谱系，然而，它的使用系统发育重建尚未得到证明。我们探讨了使用线粒体（mt）基因组片段化解决有争议的suborder-level寄生虱（Phthiraptera）的寄生性。在四个亚目（Amblycera，Ischnocera，Rhynchophthirina和Anoplura）中有大约5000种寄生虱，它们侵染哺乳动物和鸟类。这些亚目之间的系统发育关系是未解决的，尽管几十年的研究。我们对8种寄生虱的mt基因组进行了测序，并将它们与之前测序的17种寄生虱进行了比较。我们发现，典型的单染色体mt基因组保留在鸟类虱子中，但在真兽目哺乳动物的虱子中分裂成许多微型染色体。共有的mt基因组片段化的衍生特征将真兽目哺乳动物虱的Ischnocera（Trichodectidae科）与Anoplura和Rhynchophthirina联合在一起，排除了Ischnocera（Philopteridae科）的鸟虱。新的分支，即Mitodivisia，也支持mt基因组和cox 1基因序列的系统发育分析。我们的研究结果表明，第一次，细胞器基因组片段化是解决有争议的高层次的遗传信息。
Organelle genome fragmentation has been found in a wide range of eukaryotic lineages; however, its use in phylogenetic reconstruction has not been demonstrated. We explored the use of mitochondrial (mt) genome fragmentation in resolving the controversial suborder-level phylogeny of parasitic lice (order Phthiraptera). There are approximately 5000 species of parasitic lice in four suborders (Amblycera, Ischnocera, Rhynchophthirina, and Anoplura), which infest mammals and birds. The phylogenetic relationships among these suborders are unresolved despite decades of studies. We sequenced the mt genomes of eight species of parasitic lice and compared them with 17 other species of parasitic lice sequenced previously. We found that the typical single-chromosome mt genome is retained in the lice of birds but fragmented into many minichromosomes in the lice of eutherian mammals. The shared derived feature of mt genome fragmentation unites the eutherian mammal lice of Ischnocera (family Trichodectidae) with Anoplura and Rhynchophthirina to the exclusion of the bird lice of Ischnocera (family Philopteridae). The novel clade, namely Mitodivisia, is also supported by phylogenetic analysis of mt genome and cox1 gene sequences. Our results demonstrate, for the first time, that organelle genome fragmentation is informative for resolving controversial high-level phylogenies.
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