Allergen sensitization is associated with increased DNA methylation in older men

Area of Science:

• Epigenetics
• Genomics
• Immunology

Background:

• Epigenetic modifications influence gene expression and disease development.
• DNA methylation of retrotransposon-derived elements is a key epigenetic mechanism.
• Complex diseases like asthma and allergies may be influenced by epigenetic variations.

Purpose of the Study:

• To investigate the association between asthma and allergic phenotypes with DNA methylation levels of retrotransposon-derived elements.
• To examine the relationship between sensitization to common allergens and DNA methylation.
• To assess the link between asthma diagnosis and DNA methylation of Alu and LINE-1 elements.

Main Methods:

• Utilized data from 704 men in the Normative Aging Study.
• Assessed DNA methylation of Alu and long interspersed nuclear element (LINE)-1 using PCR pyrosequencing in peripheral white blood cells.
• Gathered data on allergen sensitization, asthma diagnosis, and methacholine responsiveness approximately 8 years prior to methylation analysis.

Main Results:

• Prior allergen sensitization was significantly associated with increased methylation of Alu elements (p = 0.003).
• No significant association was found between Alu or LINE-1 methylation and asthma diagnosis.
• The findings were adjusted for various confounding factors including smoking, BMI, and age.

Conclusions:

• Increased DNA methylation of repetitive elements may be linked to allergen sensitization.
• Current evidence does not support an association between DNA methylation of Alu and LINE-1 elements and asthma.
• Further research is required to elucidate the underlying mechanisms connecting epigenetic modifications, sensitization, and asthma.