Forkhead Box P3 Methylation and Expression in Men with Obstructive Sleep Apnea

Area of Science:

• Immunogenetics
• Sleep Medicine
• Epigenetics

Background:

• Epigenetic alterations in obstructive sleep apnea (OSA) may explain end-organ damage.
• In children with OSA, Forkhead Box P3 (FOXP3) DNA methylation correlated with inflammatory markers.
• However, FOXP3 methylation patterns and their impact on gene expression in adults with OSA remain uninvestigated.

Purpose of the Study:

• To investigate the methylation status and expression of the FOXP3 gene in adults with obstructive sleep apnea (OSA).
• To determine if FOXP3 epigenetic modifications are associated with inflammation in adult OSA patients.

Main Methods:

• Analysis of plasma samples from adult patients with severe OSA and matched controls (EPIOSA Study).
• Evaluation of FOXP3 gene promoter and Treg-specific demethylated region (TSDR) methylation via PCR and pyrosequencing.
• Quantification of FOXP3 protein and mRNA expression using ELISA and qRT-PCR, alongside assessment of C-reactive protein (CRP) and Treg cells.

Main Results:

• No significant differences in FOXP3 promoter or TSDR methylation were observed between OSA patients and controls.
• FOXP3 protein and mRNA expression levels were comparable in both groups, irrespective of CRP levels.
• No association was found between FOXP3 methylation/expression and inflammatory status in adult OSA.

Conclusions:

• FOXP3 gene methylation is not altered in adults suffering from obstructive sleep apnea.
• FOXP3 gene expression remains unchanged in adult OSA patients, independent of their inflammatory status.
• These findings suggest FOXP3 epigenetic regulation is not a significant factor in adult OSA pathophysiology.