首页> 美国卫生研究院文献>Proceedings of the Royal Society B: Biological Sciences >Nuclear ribosomal DNA monophyly versus mitochondrial DNA polyphyly in two closely related mite species: the influence of life history and molecular drive.
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Nuclear ribosomal DNA monophyly versus mitochondrial DNA polyphyly in two closely related mite species: the influence of life history and molecular drive.

机译:在两个密切相关的螨虫物种中核核糖体DNA单性与线粒体DNA多性:生活史和分子驱动力的影响。

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摘要

In two very closely related but reproductively isolated mite species, Tetranychus urticae and T. turkestani, we found nucleotide diversity to be extensive for mitochondrial DNA (mtDNA) cytochrome oxidase 1 (COI) (3-4%) but extremely reduced for nuclear ribosomal DNA (rDNA) internal transcribed spacer (ITS2) (less than 0.5%). By contrast, ITS2 was shown to evolve much faster than COI between species of this genus. Furthermore, we found that these two species are polyphyletic for mtDNA but monophyletic for rDNA. Thus it appears that despite its biparental transmission and multiplicity of copies in the genome, nuclear rDNA has a smaller effective population size than mtDNA in these species. The conjunction of efficient concerted evolution and/or gene conversion in the rDNA cluster, the haplodiploidy of these species and their female-biased sex ratio could account for this apparent contradiction.
机译:在两个非常相关但生殖分离的螨种中,Tetranychus urticae和T. turkestani,我们发现线粒体DNA(mtDNA)细胞色素氧化酶1(COI)(3-4%)的核苷酸多样性广泛,而核核糖体DNA的核苷酸多样性却大大降低(rDNA)内部转录间隔区(ITS2)(小于0.5%)。相比之下,在该属的物种之间,ITS2的进化比COI快得多。此外,我们发现这两个物种对于mtDNA是多系的,而对于rDNA是单系的。因此看来,尽管在这些基因组中核rDNA的双亲传播和拷贝的多样性,但其有效种群规模却比mtDNA小。在rDNA簇中有效协同进化和/或基因转化,这些物种的单倍体和它们的雌性偏性比例的结合可以解释这种明显的矛盾。

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