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Transposon age and non-CG methylation.

Published version
Peer-reviewed

Type

Article

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Authors

Abstract

Silencing of transposable elements (TEs) is established by small RNA-directed DNA methylation (RdDM). Maintenance of silencing is then based on a combination of RdDM and RNA-independent mechanisms involving DNA methyltransferase MET1 and chromodomain DNA methyltransferases (CMTs). Involvement of RdDM, according to this model should decrease with TE age but here we show a different pattern in tomato and Arabidopsis. In these species the CMTs silence long terminal repeat (LTR) transposons in the distal chromatin that are younger than those affected by RdDM. To account for these findings we propose that, after establishment of primary RdDM as in the original model, there is an RNA-independent maintenance phase involving CMTs followed by secondary RdDM. This progression of epigenetic silencing in the gene-rich distal chromatin is likely to influence the transcriptome either in cis or in trans depending on whether the mechanisms are RNA-dependent or -independent.

Description

Keywords

CRISPR-Cas Systems, Chromatin, DNA Methylation, DNA Transposable Elements, Evolution, Molecular, Gene Silencing, Solanum lycopersicum, Mutation, Nucleotides, Phenotype, Plant Proteins, RNA Polymerase II, Terminal Repeat Sequences

Journal Title

Nat Commun

Conference Name

Journal ISSN

2041-1723
2041-1723

Volume Title

11

Publisher

Springer Science and Business Media LLC
Sponsorship
International Balzan Prize Foundation (10957)
Royal Society (RP170001)
Royal Society (RP/EA/180018)
Biotechnology and Biological Sciences Research Council (BB/R018529/1)
European Research Council (340642)
This work was supported by European Research Council Advanced Investigator grant ERC-2013-AdG 340642 (Transgressive Inheritance in plant Breeding and Evolution [TRIBE]), the Royal Society (RP170001), the Balzan Foundation and BBSRC grant BB/R018529/1. D.C.B. is the Royal Society Edward Penley Abraham Research Professor.