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Article

Diversification of Transposable Elements in Arthropods and Its Impact on Genome Evolution

State Key Laboratory of Protein and Plant Gene Research, Center for Bioinformatics, School of Life Sciences, Peking University, Beijing 100871, China
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Genes 2019, 10(5), 338; https://doi.org/10.3390/genes10050338
Received: 18 February 2019 / Revised: 9 April 2019 / Accepted: 26 April 2019 / Published: 6 May 2019
(This article belongs to the Special Issue Repetitive DNA Sequences)
Transposable elements (TEs) are ubiquitous in arthropods. However, analyses of large-scale and long-term coevolution between TEs and host genomes remain scarce in arthropods. Here, we choose 14 representative Arthropoda species from eight orders spanning more than 500 million years of evolution. By developing an unbiased TE annotation pipeline, we obtained 87 to 2266 TE reference sequences in a species, which is a considerable improvement compared to the reference TEs previously annotated in Repbase. We find that TE loads are diversified among species and were previously underestimated. The highly species- and time-specific expansions and contractions, and intraspecific sequence diversification are the leading driver of long terminal repeat (LTR) dynamics in Lepidoptera. Terminal inverted repeats (TIRs) proliferated substantially in five species with large genomes. A phylogenetic comparison reveals that the loads of multiple TE subfamilies are positively correlated with genome sizes. We also identified a few horizontally transferred TE candidates across nine species. In addition, we set up the Arthropod Transposable Elements database (ArTEdb) to provide TE references and annotations. Collectively, our results provide high-quality TE references and uncover that TE loads and expansion histories vary greatly among arthropods, which implies that TEs are an important driving force shaping the evolution of genomes through gain and loss. View Full-Text
Keywords: transposable elements; evolution; arthropods; genome size; horizontal transfer; database transposable elements; evolution; arthropods; genome size; horizontal transfer; database
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MDPI and ACS Style

Wu, C.; Lu, J. Diversification of Transposable Elements in Arthropods and Its Impact on Genome Evolution. Genes 2019, 10, 338. https://doi.org/10.3390/genes10050338

AMA Style

Wu C, Lu J. Diversification of Transposable Elements in Arthropods and Its Impact on Genome Evolution. Genes. 2019; 10(5):338. https://doi.org/10.3390/genes10050338

Chicago/Turabian Style

Wu, Changcheng, and Jian Lu. 2019. "Diversification of Transposable Elements in Arthropods and Its Impact on Genome Evolution" Genes 10, no. 5: 338. https://doi.org/10.3390/genes10050338

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