Can Exercise Training Alter Human Skeletal Muscle DNA Methylation?

Area of Science:

• Epigenetics
• Skeletal Muscle Physiology
• Metabolic Health

Background:

• Skeletal muscle plasticity is influenced by physical activity.
• DNA methylation patterns in muscle may change with exercise.
• Understanding these changes is crucial for metabolic health.

Purpose of the Study:

• To investigate skeletal muscle DNA methylation changes after 8 weeks of exercise.
• To assess the impact of exercise on insulin sensitivity and related methylation.
• To identify specific genes and pathways affected by exercise-induced methylation alterations.

Main Methods:

• 13 sedentary participants underwent 8 weeks of supervised exercise.
• Euglycemic hyperinsulinemic clamps and VO2 peak tests were performed pre- and post-training.
• Global DNA methylation was analyzed using Illumina's Methylation EPIC 850K BeadChip.

Main Results:

• Exercise training improved peak aerobic capacity and insulin-stimulated glucose disposal.
• Significant decreases in fasting insulin and improved insulin clearance were observed.
• Differential methylation was identified in genes related to metabolism, cytoskeleton, and myogenesis.

Conclusions:

• Eight weeks of exercise significantly alters skeletal muscle DNA methylation patterns.
• Exercise-induced methylation changes are linked to improved metabolic function.
• These epigenetic modifications in skeletal muscle highlight exercise's role in metabolic regulation.