Molecular Mechanisms for the Variation of Mitochondrial Gene Content and Gene Arrangement Among Chigger Mites of the Genus Leptotrombidium (Acari: Acariformes)
Molecular Mechanisms for the Variation of Mitochondrial Gene Content and Gene Arrangement Among Chigger Mites of the Genus Leptotrombidium (Acari: Acariformes)
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DOI：
10.1007/s00239-005-0196-y
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发表时间：
2006-07
影响因子：
3.9
通讯作者：
R. Shao;S. Barker;H. Mitani;Mamoru Takahashi;M. Fukunaga
中科院分区：
文献类型：
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作者：
R. Shao;S. Barker;H. Mitani;Mamoru Takahashi;M. Fukunaga
后生动物线粒体（mt）基因组的基因含量通常是保守的，即37个基因和一个大的非编码区（LNR）。这些基因和nris的排列通常在低分类水平上保守，但在高分类水平上变化很大。本文报道了细原体恙螨mt基因含量和基因排列的差异。我们之前发现，除了后生动物的37个基因和1个lnrr外，pallidumleptotrombidium的mt基因组还具有一个用于大亚单位rRNA （rrnL）的额外基因、一个用于小亚单位rRNA （PrrnS）的伪基因和3个额外的alnrs。进一步，分析了l .的mt基因的排列。苍白球与节肢动物假想祖先的苍白球截然不同。为了找出新基因的含量和基因排列在多大程度上发生在瘦原体中，我们对其他三个物种的全部或部分基因组进行了测序。akamushi, L。非电信deliense。fletcheri。这三个物种与l的所有基因排列相同。除了trnq（用于trna -谷氨酰胺）。UnlikeL。然而，这三个物种没有额外的lnr，只有一个额外的lnr。通过与节肢动物祖先的比较，我们提出：(1)mt基因组类型存在于l。(2) mt基因含量和基因排列的进化涉及三种分子机制。
The gene content of a mitochondrial (mt) genome, i.e., 37 genes and a large noncoding region (LNR), is usually conserved in Metazoa. The arrangement of these genes and theLNRis generally conserved at low taxonomic levels but varies substantially at high levels. We report here a variation in mt gene content and gene arrangement among chigger mites of the genusLeptotrombidium. We found previously that the mt genome ofLeptotrombidium pallidumhas an extra gene for large-subunit rRNA (rrnL), a pseudo-gene for small-subunit rRNA (PrrnS), and three extraLNRs, additional to the 37 genes and anLNRtypical of Metazoa. Further, the arrangement of mt genes ofL. pallidumdiffers drastically from that of the hypothetical ancestor of the arthropods. To find to what extent the novel gene content and gene arrangement occurred inLeptotrombidium, we sequenced the entire or partial mt genomes of three other species,L. akamushi,L. deliense, andL. fletcheri. These three species share the arrangement of all genes withL. pallidum, excepttrnQ(for tRNA-glutamine). UnlikeL. pallidum, however, these three species do not have extrarrnLorPrrnSand have only one extraLNR. By comparison betweenLeptotrombidiumspecies and the ancestor of the arthropods, we propose that (1) the type of mt genome present inL. pallidumevolved from the type present in the other threeLeptotrombidiumspecies, and (2) three molecular mechanisms were involved in the evolution of mt gene content and gene arrangement inLeptotrombidiumspecies.