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Expansion of a single transposable element family is associated with genome-size increase and radiation in the genus Hydra

Transposable elements are one of the major contributors to genome-size differences in metazoans. Despite this, relatively little is known about the evolutionary patterns of element expansions and the element families involved. Here we report a broad genomic sampling within the genus Hydra, a freshwa...

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Bibliographic Details
Main Authors: Wong, Wai Yee (Author) , Kuhn, Anne (Author) , Holstein, Thomas W. (Author)
Format: Article (Journal)
Language:English
Published: October 28, 2019
In: Proceedings of the National Academy of Sciences of the United States of America
Year: 2019, Volume: 116, Issue: 46, Pages: 22915-22917
ISSN:1091-6490
DOI:10.1073/pnas.1910106116
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1073/pnas.1910106116
Verlag, lizenzpflichtig, Volltext: https://www.pnas.org/content/116/46/22915
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Author Notes:Wai Yee Wong, Oleg Simakov, Diane M. Bridge, Paulyn Cartwright, Anthony J. Bellantuono, Anne Kuhn, Thomas W. Holstein, Charles N. David, Robert E. Steele, and Daniel E. Martínez
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Summary:Transposable elements are one of the major contributors to genome-size differences in metazoans. Despite this, relatively little is known about the evolutionary patterns of element expansions and the element families involved. Here we report a broad genomic sampling within the genus Hydra, a freshwater cnidarian at the focal point of diverse research in regeneration, symbiosis, biogeography, and aging. We find that the genome of Hydra is the result of an expansion event involving long interspersed nuclear elements and in particular a single family of the chicken repeat 1 (CR1) class. This expansion is unique to a subgroup of the genus Hydra, the brown hydras, and is absent in the green hydra, which has a repeat landscape similar to that of other cnidarians. These features of the genome make Hydra attractive for studies of transposon-driven genome expansions and speciation.
Item Description:Gesehen am 28.04.2020
Physical Description:Online Resource
ISSN:1091-6490
DOI:10.1073/pnas.1910106116

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