Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 21, Pages 6676-6681Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1424254112
Keywords
epigenetics; epimutation; DNA methylation; evolution; Arabidopsis
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Funding
- Netherlands Organization for Scientific Research
- University of Groningen Rosalind Franklin Fellowship
- National Institutes of Health [R00GM100000]
- National Science Foundation [IOS-1339194]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1339194] Funding Source: National Science Foundation
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Stochastic changes in cytosine methylation are a source of heritable epigenetic and phenotypic diversity in plants. Using the model plant Arabidopsis thaliana, we derive robust estimates of the rate at which methylation is spontaneously gained (forward epimutation) or lost (backward epimutation) at individual cytosines and construct a comprehensive picture of the epimutation landscape in this species. We demonstrate that the dynamic interplay between forward and backward epimutations is modulated by genomic context and show that subtle contextual differences have profoundly shaped patterns of methylation diversity in A. thaliana natural populations over evolutionary timescales. Theoretical arguments indicate that the epimutation rates reported here are high enough to rapidly uncouple genetic from epigenetic variation, but low enough for new epialleles to sustain long-term selection responses. Our results provide new insights into methylome evolution and its population-level consequences.
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