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Dynamic DNA methylation turnover in gene bodies is associated with enhanced gene expression plasticity

Clara J. Williams, Dawei Dai, Kevin A. Tran, View ORCID ProfileJ. Grey Monroe, Ben P. Williams
doi: https://doi.org/10.1101/2022.12.02.518885
Clara J. Williams
1Department of Plant & Microbial Biology, University of California, Berkeley
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Dawei Dai
1Department of Plant & Microbial Biology, University of California, Berkeley
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Kevin A. Tran
1Department of Plant & Microbial Biology, University of California, Berkeley
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J. Grey Monroe
2Department of Plant Sciences, University of California, Davis
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  • ORCID record for J. Grey Monroe
Ben P. Williams
1Department of Plant & Microbial Biology, University of California, Berkeley
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  • For correspondence: benwiliams@berkeley.edu
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ABSTRACT

Background In diverse eukaryotes, DNA methylation is deposited within the coding regions of many genes, termed gene body methylation (GbM). Whereas the role of DNA methylation on the silencing of transposons and repetitive DNA is well understood, gene body methylation is not associated with transcriptional repression, and its biological importance has remained unclear.

Results We report a newly discovered type of GbM in plants, which is under constitutive addition and removal by dynamic methylation modifiers in all cells, including the germline. Methylation at Dynamic GbM genes is removed by the DRDD demethylation pathway, and added by an unknown source of de novo methylation, most likely the maintenance methyltransferase MET1. We show that the Dynamic GbM state is present at homologous genes across divergent lineages (>100 million years), indicating evolutionary conservation. Furthermore, we demonstrate that Dynamic GbM is tightly associated with the presence of a promoter/regulatory chromatin state within the gene body, in contrast to other gene body methylated genes. Lastly, we find Dynamic GbM is associated with enhanced gene expression plasticity across development and diverse physiological conditions, whereas stably methylated GbM genes exhibit reduced plasticity.

Conclusions This study proposes a new model for GbM in regulating gene expression plasticity, including a newly discovered type of GbM in which increased gene expression plasticity is associated with the activity of DNA methylation writers and erasers and the enrichment of a regulatory chromatin state. We propose that Dynamic GbM is a hallmark of genes that can navigate a greater landscape of transcriptional states by maintaining regulatory flexibility.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted December 03, 2022.
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Dynamic DNA methylation turnover in gene bodies is associated with enhanced gene expression plasticity
Clara J. Williams, Dawei Dai, Kevin A. Tran, J. Grey Monroe, Ben P. Williams
bioRxiv 2022.12.02.518885; doi: https://doi.org/10.1101/2022.12.02.518885
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Dynamic DNA methylation turnover in gene bodies is associated with enhanced gene expression plasticity
Clara J. Williams, Dawei Dai, Kevin A. Tran, J. Grey Monroe, Ben P. Williams
bioRxiv 2022.12.02.518885; doi: https://doi.org/10.1101/2022.12.02.518885

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