Journal
PLOS ONE
Volume 11, Issue 3, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0150002
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Funding
- National Institute of Biomedical Imaging and Bioengineering, National Research Service Award from the University of California, Irvine, Center for Complex Biological Systems [EB009418]
- SOKENDAI
- JSPS [15K18585]
- NSF [IOS-1542703]
- Direct For Biological Sciences [1542703] Funding Source: National Science Foundation
- Division Of Integrative Organismal Systems [1542703] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [15K18585] Funding Source: KAKEN
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DNA methylation has the potential to influence plant growth and development through its influence on gene expression. To date, however, the evidence from plant systems is mixed as to whether patterns of DNA methylation vary significantly among tissues and, if so, whether these differences affect tissue-specific gene expression. To address these questions, we analyzed both bisulfite sequence (BSseq) and transcriptomic sequence data from three biological replicates of two tissues (leaf and floral bud) from the model grass species Brachypodium distachyon. Our first goal was to determine whether tissues were more differentiated in DNA methylation than explained by variation among biological replicates. Tissues were more differentiated than biological replicates, but the analysis of replicated data revealed high (>50%) false positive rates for the inference of differentially methylated sites (DMSs) and differentially methylated regions (DMRs). Comparing methylation to gene expression, we found that differential CG methylation consistently covaried negatively with gene expression, regardless as to whether methylation was within genes, within their promoters or even within their closest transposable element. The relationship between gene expression and either CHG or CHH methylation was less consistent. In total, CG methylation in promoters explained 9% of the variation in tissue-specific expression across genes, suggesting that CG methylation is a minor but appreciable factor in tissue differentiation.
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