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DNA Methylation and the Evolution of Developmental Complexity in Plants
Katharina Bräutigam1, Quentin Cronk2
1Department of Biology, University of Toronto Mississauga, Mississauga, ON, Canada.
Frontiers in Plant Science
|October 24, 2018
Summary
DNA methylation in plants, initially for silencing transposons, also regulates development and phenotypic plasticity. This epigenetic mechanism fine-tunes organ development and contributes to evolutionary novelty.
Area of Science:
- Plant biology
- Epigenetics
- Evolutionary developmental biology (Evo-Devo)
Background:
- DNA methylation is a conserved epigenetic mechanism in land plants, primarily known for silencing transposable elements (TEs).
- This mechanism has been co-opted during evolution to regulate gene expression, influencing both normal development and phenotypic plasticity.
Purpose of the Study:
- To explore the dual role of DNA methylation in plant TE management and developmental regulation.
- To assess the significance of DNA methylation in the evolution of plant developmental complexity and phenotypic variation.
Main Methods:
- The study synthesizes existing research on DNA methylation across various land plant species.
- It analyzes the functional roles of DNA methylation in gene regulation and its evolutionary implications.
Main Results:
- DNA methylation plays a crucial role in managing developmental pathways, influencing organ presence, absence, and positioning.
- While not central to the evolution of entirely new organs, it significantly broadens the range of phenotypic expression and complexity.
- Epigenetic changes via DNA methylation can act as 'soft' mutations, potentially driving early stages of evolutionary novelty.
Conclusions:
- DNA methylation is vital for fine-tuning plant development and phenotypic plasticity, contributing significantly to plant complexity.
- Its role in managing developmental pathways and acting as a source of evolutionary novelty underscores its importance in plant evolution.
- The field of epigenetics and evolutionary developmental biology (epi-evodevo) highlights the dynamic interplay between DNA methylation and plant evolution.
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