Proximal methylation features associated with nonrandom changes in gene body methylation.

Area of Science:

• Epigenetics
• Genomics
• Plant Biology

Background:

• Gene body methylation at CG dinucleotides is a conserved but poorly understood epigenetic mark.
• The Arabidopsis thaliana Cvi strain exhibits reduced gene body methylation compared to the Col strain, providing a natural model for studying methylation stability.

Purpose of the Study:

• To investigate the stability and inheritance of gene body methylation patterns.
• To identify factors influencing the maintenance of CG methylation states in Arabidopsis thaliana.

Main Methods:

• Utilized recombinant inbred lines from Col and Cvi strains of Arabidopsis thaliana.
• Employed a logistic regression framework to predict sites with unstable methylation.
• Analyzed methylation patterns across multiple generations and in other plant species like maize and Brachypodium distachyon.

Main Results:

• Gene body CG methylation patterns are predominantly transmitted faithfully over nine generations.
• A small fraction (1-4%) of CG sites exhibit methylation loss or gain, with unstable sites being non-random and shared across lines.
• Intermediate local CG methylation and high methylation variability across strains are strong predictors of unstable methylation sites.

Conclusions:

• Identified key features governing the inheritance of gene body methylation.
• Demonstrated that distinct methylation equilibria can be stably maintained within individuals, highlighting the dynamic nature of epigenetic regulation.