Recurrent horizontal transfers of Chapaev transposons in diverse invertebrate and vertebrate animals.
Recurrent horizontal transfers of Chapaev transposons in diverse invertebrate and vertebrate animals.
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Chapaev 转座子在多种无脊椎动物和脊椎动物中的反复水平转移。
DOI：
10.1093/gbe/evu112
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发表时间：
2014-05-27
影响因子：
3.3
通讯作者：
Zhang Z
中科院分区：
文献类型：
--
作者：
Zhang HH;Feschotte C;Han MJ;Zhang Z
转座因子（TE）向新基因组的水平转移（HT）被认为是推动基因组变异和生物创新的重要力量。此外，HT在真核生物基因组中te的持续存在中也起着重要作用。在这里，我们提供了第一个记录的Chapaev转座子三个家族在广泛的动物物种中重复HT的例子，包括哺乳动物、爬行动物、颚鱼、七鳃鳗、昆虫和昆虫bracovirus。在这些物种中发现的Chapaev转座子的多重比对显示出极高的核苷酸序列一致性（79-99%），这与垂直进化不一致，因为这些宿主物种之间存在较长的分化时间。相反，这些转座子在物种间的不连续分布和缺乏作用于这些转座子的净化选择强烈表明它们是独立地和水平地转移到这些物种谱系中的。在一种昆虫冠状病毒中检测到恰帕耶夫转座子，表明这些病毒可能是恰帕耶夫转座子水平传播的可能载体。七鳃鳗和它们的一些共同宿主（如鲟鱼和白鲟）也共享其中一个Chapaev科，这表明寄生虫与宿主的相互作用可能促进了高温寄生。
Horizontal transfer (HT) of a transposable element (TE) into a new genome is regarded as an important force to drive genome variation and biological innovation. In addition, HT also plays an important role in the persistence of TEs in eukaryotic genomes. Here, we provide the first documented example for the repeated HT of three families of Chapaev transposons in a wide range of animal species, including mammals, reptiles, jawed fishes, lampreys, insects, and in an insect bracovirus. Multiple alignments of the Chapaev transposons identified in these species revealed extremely high levels of nucleotide sequence identity (79–99%), which are inconsistent with vertical evolution given the deep divergence time separating these host species. Rather, the discontinuous distribution amongst species and lack of purifying selection acting on these transposons strongly suggest that they were independently and horizontally transferred into these species lineages. The detection of Chapaev transposons in an insect bracovirus indicated that these viruses might act as a possible vector for the horizontal spread of Chapaev transposons. One of the Chapaev families was also shared by lampreys and some of their common hosts (such as sturgeon and paddlefish), which suggested that parasite–host interaction might facilitate HTs.
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