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[A case-control study on the relationship between DNA methylation and occupational noise hearing loss]
1Department of Occupational Health, The Third People's Hospital of Henan Province (Henan Hospital for Occupational Diseases),Zhengzhou 450052, China.
Summary
Occupational noise exposure may cause hearing loss through changes in DNA methylation, affecting neuronal development and metabolic pathways. This study highlights potential biomarkers for noise-induced hearing loss.
Area of Science:
- Epigenetics and Environmental Health
- Occupational Medicine
- Auditory Neuroscience
Background:
- Occupational noise exposure is a significant risk factor for hearing loss.
- The epigenetic mechanisms, particularly DNA methylation, underlying noise-induced hearing loss are not well understood.
- Identifying molecular changes associated with occupational hearing loss is crucial for prevention and treatment.
Purpose of the Study:
- To investigate the association between DNA methylation patterns and occupational noise-induced hearing loss.
- To identify specific differentially methylated positions (DMPs) and regions (DMRs) linked to hearing impairment from noise.
- To explore the functional implications of these epigenetic changes through gene ontology (GO) and KEGG pathway analysis.
Main Methods:
- A case-control study involving 60 participants (30 with noise-induced hearing loss, 30 with normal hearing exposed to occupational noise).
- Genome-wide DNA methylation analysis using 850k methylation chip technology.
- Statistical analysis of DMPs and DMRs using R-packet 'Champ', followed by GO and KEGG pathway enrichment analysis using ClusterProfiler.
Main Results:
- Significant differences in DNA methylation were observed, with 439 significant DMPs (0.06%) and 72 significant DMRs (11.08%) identified between cases and controls.
- GO enrichment analysis revealed significant alterations in pathways related to neuronal development and differentiation in the central nervous system.
- KEGG pathway analysis indicated significant differences in sphingolipid metabolism, aldosterone synthesis and secretion, and primary bile acid biosynthesis.
Conclusions:
- Occupational noise-induced hearing loss is potentially associated with altered gene expression regulated by DNA methylation.
- Key affected pathways include neuronal development, axogenesis, differentiation, sphingolipid metabolism, and aldosterone synthesis.
- These findings suggest novel epigenetic targets and biomarkers for understanding and managing noise-induced hearing loss.
