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Epigenomes 2017, 1(1), 7; doi:10.3390/epigenomes1010007

Epigenetic Regulation of a Heat-Activated Retrotransposon in Cruciferous Vegetables

1
Graduate School of Life Science, Hokkaido University, Kita10 Nishi8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
2
Faculty of Life Sciences, Kyoto Sangyo University, Kamigamo Motoyama Kita-ku, Kyoto 603-8555, Japan
3
Faculty of Science, Hokkaido University, Kita10 Nishi8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Etienne Bucher
Received: 10 May 2017 / Revised: 26 May 2017 / Accepted: 31 May 2017 / Published: 7 June 2017
(This article belongs to the Special Issue Plant Epigenome Dynamics)
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Abstract

Transposable elements (TEs) are highly abundant in plant genomes. Environmental stress is one of the critical stimuli that activate TEs. We analyzed a heat-activated retrotransposon, named ONSEN, in cruciferous vegetables. Multiple copies of ONSEN-like elements (OLEs) were found in all of the cruciferous vegetables that were analyzed. The copy number of OLE was high in Brassica oleracea, which includes cabbage, cauliflower, broccoli, Brussels sprout, and kale. Phylogenic analysis demonstrated that some OLEs transposed after the allopolyploidization of parental Brassica species. Furthermore, we found that the high copy number of OLEs in B. oleracea appeared to induce transpositional silencing through epigenetic regulation, including DNA methylation. The results of this study would be relevant to the understanding of evolutionary adaptations to thermal environmental stress in different species. View Full-Text
Keywords: Heat stress; cruciferae; ONSEN; retrotransposon Heat stress; cruciferae; ONSEN; retrotransposon
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MDPI and ACS Style

Nozawa, K.; Kawagishi, Y.; Kawabe, A.; Sato, M.; Masuta, Y.; Kato, A.; Ito, H. Epigenetic Regulation of a Heat-Activated Retrotransposon in Cruciferous Vegetables. Epigenomes 2017, 1, 7.

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