Department of Biology, University of Southern Indiana, 8600 University Blvd., Evansville, IN, 47712, USA.
J Mol Evol. 2018 Apr;86(3-4):187-189. doi: 10.1007/s00239-018-9835-y. Epub 2018 Mar 21.
We report herein the characterization of a nuclear paralog of a fragment of the mitochondrial genome (a numt) in two closely related species of lampreys (Ichthyomyzon spp.). Although numts have been characterized in several vertebrate taxa, numts have yet to be reported for fishes in general. Given the phylogenetic position of lampreys relative to other vertebrates, the presence of numts within the lamprey genome is either evidence of an ancestral trait lost in other fishes but uniquely retained in agnathans and amniotes, or (more intriguingly) a product of the genome rearrangements these animals undergo during development.
我们在此报告了在两种密切相关的七鳃鳗（Ichthyomyzon spp.）中，一个线粒体基因组片段（numt）的核同源物的特征。尽管已经在几个脊椎动物分类群中描述了 numt，但一般来说，鱼类的 numt 尚未报道。鉴于七鳃鳗相对于其他脊椎动物的系统发育位置，numt 存在于七鳃鳗基因组中，要么是在其他鱼类中失去的祖先特征的证据，但在无颌类和羊膜动物中独特保留，要么（更有趣的是）是这些动物在发育过程中经历的基因组重排的产物。
