A Rat Methyl-Seq Platform to Identify Epigenetic Changes Associated with Stress Exposure

Area of Science:

• Epigenetics
• Animal Models
• Genomics

Background:

• Growing availability of animal genomes necessitates tools for dynamic epigenetic analysis.
• The rat is a key model organism for pharmacological and behavioral studies.
• Epigenetic insights can enhance mechanistic understanding in rat models.

Purpose of the Study:

• To adapt the SureSelect Target Capture System (Methyl-Seq) for the rat genome.
• To assess DNA methylation levels across the rat genome, focusing on regulatory regions.
• To establish an epigenetic tool for identifying stress-induced methylation changes in rats.

Main Methods:

• Targeted capture of promoters, CpG islands, shores, and GC-rich regions in the rat genome.
• Exposure of male Sprague Dawley rats to chronic variable stress.
• DNA methylation analysis using Methyl-Seq, including bisulfite conversion and next-generation sequencing.
• Identification and validation of differentially methylated regions (DMRs) via bisulfite pyrosequencing.

Main Results:

• Successful adaptation of the Methyl-Seq platform for rat DNA.
• Identification of DMRs between stressed and unstressed rat groups.
• Validation of candidate DMRs, confirming the platform's robustness.
• Demonstration that the rat Methyl-Seq platform captures stress-induced methylation changes.

Conclusions:

• The rat Methyl-Seq platform is an effective epigenetic tool.
• This tool can reveal dynamic DNA methylation changes in response to environmental factors like stress.
• The platform provides valuable mechanistic insights for rat-based research.