Abstract:
:Transposable elements (TEs) are genomic sequences that can move, multiply, and often form sizable fractions of vertebrate genomes. Fish belong to a unique group of vertebrates, since their karyotypes and genome sizes are more diverse and complex, with probably higher diversity and evolution specificity of TE. To investigate the characteristics of fish TEs, we compared the mobilomes of 39 species, and observed significant variation of TE content in fish (from 5% in pufferfish to 56% in zebrafish), along with a positive correlation between fish genome size and TE content. In different classification hierarchies, retrotransposons (class), long terminal repeat (order), as well as Helitron, Maverick, Kolobok, CMC, DIRS, P, I, L1, L2, and 5S (superfamily) were all positively correlated with fish genome size. Consistent with previous studies, our data suggested fish genomes to not always be dominated by DNA transposons; long interspersed nuclear elements are also prominent in many species. This study suggests CR1 distribution in fish genomes to be obviously regular, and provides new clues concerning important events in vertebrate evolution. Altogether, our results highlight the importance of TEs in the structure and evolution of fish genomes and suggest fish species diversity to parallel transposon content diversification.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Shao F,Han M,Peng Zdoi
10.1038/s41598-019-51888-1subject
Has Abstractpub_date
2019-10-28 00:00:00pages
15399issue
1issn
2045-2322pii
10.1038/s41598-019-51888-1journal_volume
9pub_type
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