DNA 转座子向龟、鱼和青蛙的多次水平转移事件

IF 4.7 2区 生物学 Q1 GENETICS & HEREDITY Mobile DNA Pub Date : 2024-04-11 DOI:10.1186/s13100-024-00318-9
Nozhat T. Hassan, James D. Galbraith, David L. Adelson
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引用次数: 0

摘要

转座元件(HTT)的水平转移在许多物种中都有报道,这类事件对基因组结构和功能的影响也有很好的描述。然而,很少有研究关注爬行动物基因组,尤其是龟鳖类(Testudines)的 HTT 事件。在这里,通过研究菱纹龟(Malaclemys terrapin terrapin)的重复内容,我们发现了一个高相似度的 DNA 转座子,在 RepBase 中被注释为 hAT-6_XT,该转座子是其他龟类、鳐鱼和青蛙共有的。DNA 转座子成功侵入新的基因组需要编码的转座酶中特定残基的保护,通过结构分析,这些残基被确定下来,表明功能性转座活性有所保留。我们记录了最近在龟类中发生的六次独立的DNA转座子HTT事件,众所周知,龟类的基因组进化速度较低,而且有古老的重复序列。Malaclemys terrapin terrapin(菱形龟)。Malaclemys terrapin pileata(密西西比菱背陆龟)。Trachemys scripta elegans(红耳滑龟)。Chrysemys picta bellii(西部彩龟)。Dermatemys mawii(Hickatee 海龟)。Sternotherus odoratus(普通麝香龟)。Mesoclemmys tuberculata (Tuberculate Toad-headed turtle).Etheostoma spectabile(橙喉镖鱼)。Thalassophryne amazonica(史前怪鱼)。Scophthalmus maximus(多宝鱼)。大琵琶鱼(Syngnathus acus)。Scleropages formosus(亚洲箭鱼)。热带爪蛙(西方爪蛙)。
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Multiple horizontal transfer events of a DNA transposon into turtles, fishes, and a frog
Horizontal transfer of transposable elements (HTT) has been reported across many species and the impact of such events on genome structure and function has been well described. However, few studies have focused on reptilian genomes, especially HTT events in Testudines (turtles). Here, as a consequence of investigating the repetitive content of Malaclemys terrapin terrapin (Diamondback turtle) we found a high similarity DNA transposon, annotated in RepBase as hAT-6_XT, shared between other turtle species, ray-finned fishes, and a frog. hAT-6_XT was notably absent in reptilian taxa closely related to turtles, such as crocodiles and birds. Successful invasion of DNA transposons into new genomes requires the conservation of specific residues in the encoded transposase, and through structural analysis, these residues were identified indicating some retention of functional transposition activity. We document six recent independent HTT events of a DNA transposon in turtles, which are known to have a low genomic evolutionary rate and ancient repeats. Malaclemys terrapin terrapin (Diamondback turtle). Malaclemys terrapin pileata (Mississippi diamondback terrapin turtle). Trachemys scripta elegans (Red-eared slider turtle). Chrysemys picta bellii (Western painted turtle). Dermatemys mawii (Hickatee turtle). Sternotherus odoratus (Common musk turtle). Mesoclemmys tuberculata (Tuberculate Toad-headed turtle). Etheostoma spectabile (Orangethroat darter fish). Thalassophryne amazonica (Prehistoric monster fish). Scophthalmus maximus (Turbot fish). Syngnathus acus (Greater pipefish). Scleropages formosus (Asian Arowana fish). Xenopus tropicalis (Western clawed frog).
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来源期刊
Mobile DNA
Mobile DNA GENETICS & HEREDITY-
CiteScore
8.20
自引率
6.10%
发文量
26
审稿时长
11 weeks
期刊介绍: Mobile DNA is an online, peer-reviewed, open access journal that publishes articles providing novel insights into DNA rearrangements in all organisms, ranging from transposition and other types of recombination mechanisms to patterns and processes of mobile element and host genome evolution. In addition, the journal will consider articles on the utility of mobile genetic elements in biotechnological methods and protocols.
期刊最新文献
International congress on transposable elements (ICTE 2024) in Saint Malo: breaking down transposon waves and their impact. Accelerating de novo SINE annotation in plant and animal genomes. Association of hyperactivated transposon expression with exacerbated immune activation in systemic lupus erythematosus. Widespread HCD-tRNA derived SINEs in bivalves rely on multiple LINE partners and accumulate in genic regions. Correction: Transposon-derived introns as an element shaping the structure of eukaryotic genomes.
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