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          Institute: MPI für Entwicklungsbiologie     Collection: Abteilung 6 - Molecular Biology (D. Weigel)     Display Documents

ID: 460674.0, MPI für Entwicklungsbiologie / Abteilung 6 - Molecular Biology (D. Weigel)
Selective epigenetic control of retrotransposition in Arabidopsis
Authors:Mirouze, M.; Reinders, J.; Bucher, E.; Nishimura, T.; Schneeberger, K.; Ossowski, S.; Cao, J.; Weigel, D.; Paszkowski, J.; Mathieu, O.
Date of Publication (YYYY-MM-DD):2009-09-17
Title of Journal:Nature
Issue / Number:7262
Start Page:427
End Page:430
Review Status:not specified
Audience:Not Specified
Abstract / Description:Retrotransposons are mobile genetic elements that populate chromosomes, where the host largely controls their activities. In plants and mammals, retrotransposons are transcriptionally silenced by DNA methylation, which in Arabidopsis is propagated at CG dinucleotides by METHYLTRANSFERASE 1 (MET1). In met1 mutants, however, mobilization of retrotransposons is not observed, despite their transcriptional activation. A post-transcriptional mechanism therefore seems to be preventing retrotransposition. Here we show that a copia-type retrotransposon (Evade, French for 'fugitive') evaded suppression of its movement during inbreeding of hybrid epigenomes consisting of met1- and wild-type-derived chromosomes. Evade (EVD) reinsertions caused a series of developmental mutations that allowed its identification. Genetic testing of host control of the EVD life cycle showed that transcriptional suppression occurred by CG methylation supported by RNA-directed DNA methylation. On transcriptional reactivation, subsequent steps of the EVD cycle were inhibited by plant-specific RNA polymerase IV/V and the histone methyltransferase KRYPTONITE (KYP). Moreover, genome resequencing demonstrated retrotransposition of EVD but no other potentially active retroelements when this combination of epigenetic mechanisms was compromised. Our results demonstrate that epigenetic control of retrotransposons extends beyond transcriptional suppression and can be individualized for particular elements.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Entwicklungsbiologie/Abteilung 6 - Molekulare Biologie (Detlef Weigel)
External Affiliations:%G eng
Identifiers:ISSN:1476-4687 (Electronic) %R nature08328 [pii] 10.103... [ID No:1]
URL: [ID No:2]
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