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Cytosine methylation at CpCpG sites triggers accumulation of non-CpG methylation in gene bodies

Zabet, NR and Catoni, M and Prischi, F and Paszkowski, J (2017) 'Cytosine methylation at CpCpG sites triggers accumulation of non-CpG methylation in gene bodies.' Nucleic Acids Research, 45 (7). 3777 - 3784. ISSN 0305-1048

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Abstract

© 2017 The Author(s). Methylation of cytosine is an epigenetic mark involved in the regulation of transcription, usually associated with transcriptional repression. In mammals, methylated cytosines are found predominantly in CpGs but in plants non-CpG methylation (in the CpHpG or CpHpH contexts, where H is A, C or T) is also present and is associated with the transcriptional silencing of transposable elements. In addition, CpG methylation is found in coding regions of active genes. In the absence of the demethylase of lysine 9 of histone 3 (IBM1), a subset of body-methylated genes acquires non-CpG methylation. This was shown to alter their expression and affect plant development. It is not clear why only certain body-methylated genes gain non-CpG methylation in the absence of IBM1 and others do not. Here we describe a link between CpG methylation and the establishment of methylation in the CpHpG context that explains the two classes of body-methylated genes. We provide evidence that external cytosines of CpCpG sites can only be methylated when internal cytosines are methylated. CpCpG sites methylated in both cytosines promote spreading of methylation in the CpHpG context in genes protected by IBM1. In contrast, CpCpG sites remain unmethylated in IBM1-independent genes and do not promote spread of CpHpG methylation.

Item Type: Article
Subjects: Q Science > QH Natural history > QH426 Genetics
Divisions: Faculty of Science and Health > Biological Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 09 Jan 2017 10:41
Last Modified: 17 Aug 2017 17:19
URI: http://repository.essex.ac.uk/id/eprint/18762

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