Differential DNA methylation in recovery from shift work disorder.

Area of Science:

• Epigenetics
• Chronobiology
• Molecular Biology

Background:

• The human DNA methylome (DNAme) responds to environmental factors, but its dynamic changes, particularly during recovery from circadian rhythm disruptions like shift work disorder (SWD), are not well understood.
• Shift work disorder affects a significant portion of the workforce, potentially leading to long-term health consequences due to persistent circadian misalignment.

Purpose of the Study:

• To investigate the temporal changes in DNA methylation in shift workers during recovery from shift work disorder (SWD).
• To identify specific epigenetic pathways and genes associated with recovery from SWD.

Main Methods:

• A paired epigenome-wide analysis was conducted on 32 shift workers, comparing DNA methylation levels before and after a vacation period.
• Statistical analyses identified differentially methylated positions (DMPs) and pathway enrichment analyses were performed on associated genes.

Main Results:

• Vacation had a more pronounced effect on DNA methylation in SWD cases (6.5% DMPs) compared to controls (3.7% DMPs).
• A majority of DMPs in SWD cases were hypomethylated during the work period. Pathway analysis highlighted the NMDA glutamate receptor component and the CREB phosphorylation pathway.
• Three DMPs within the CREB phosphorylation pathway (GRIN2C, CREB1, CAMK2B) correlated with the degree of recovery from SWD.

Conclusions:

• DNA methylation is dynamic and plays a role in the recovery process from circadian disorders like SWD.
• The findings suggest that pathways involving NMDA receptors and CREB phosphorylation are biologically relevant to epigenetic recovery from shift work stress.