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Genetic research

Occupational Noise Exposure Linked to Mitochondrial DNA Damage and Methylation Changes

Strategic Insights

— 1 min read

Research conducted by scientists at Fudan University has shed new light on the potential health risks associated with prolonged occupational noise exposure. The study, which recruited 306 factory workers, found that prolonged noise exposure may lead to mitochondrial DNA (mtDNA) damage and changes in methylation patterns. Notably, the researchers discovered a significant reduction in MT-RNR1 methylation among workers with abnormal hearing, while also identifying a negative association between mtDNA content and MT-RNR1 methylation.

Key Takeaways:

  • The study recruited 306 factory workers to assess the impact of occupational noise exposure on mtDNA damage and methylation patterns.
  • Prolonged noise exposure was associated with a reduction in MT-RNR1 methylation among workers with abnormal hearing.
  • A negative association was found between mtDNA content and MT-RNR1 methylation.
  • Mediation analysis indicated that mtDNAcn increased by 10.75 units in workers with abnormal hearing, with MT-RNR1 methylation mediating 35.9% of this effect.
  • The researchers suggested that occupational noise exposure may influence compensatory increases in mtDNA content through altered MT-RNR1 methylation.
  • Zhuo-Ran Li, Zhuo-Zhang Tan, Wu-Zhong Liu, Qiang Hou, Pin Sun, and Xue-Tao Zhang were co-authors on the study.
  • The study's findings may have implications for the development of novel biomarkers for monitoring occupational noise exposure.

Statistics:

  • 306 factory workers were recruited for the study.
  • The study found a reduction in MT-RNR1 methylation of 4.52% (95% CI: -7.43% to -1.62%) among workers with abnormal hearing.
  • The negative association between mtDNA content and MT-RNR1 methylation had a beta coefficient of -2.06% (95% CI: -4.44% to 0.31%).
  • Mediation analysis indicated a significant increase in mtDNAcn of 10.75 units (95% CI: 3.00 to 21.26) in workers with abnormal hearing.
  • MT-RNR1 methylation mediated 35.9% of the effect on mtDNAcn.

Sources:

  • NewsRx. Fudan University Researchers Detail Research in Environmental Health and Preventive Medicine (Reduction in mitochondrial DNA methylation leads to compensatory increase in mitochondrial DNA content: novel blood-borne biomarkers for monitoring ...). Health & Medicine Week. June 20, 2025; p 1765.
  • Yang, J. H., et al. "Reduction in mitochondrial DNA methylation leads to compensatory increase in mitochondrial DNA content: novel blood-borne biomarkers for monitoring occupational noise." Environmental Health and Preventive Medicine, vol. 30, 2025, pp. 40-40. doi: 10.1265/ehpm.25-00006.

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