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Changes in poly(ADP-ribosyl)ation patterns in workers exposed to BTX.

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|September 13, 2014
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Summary

Occupational exposure to benzene, toluene, and xylene (BTX) in China is linked to decreased DNA methylation and poly(ADP-ribosyl)ation. These epigenetic changes, involving DNMTs, MBD2, and PARP1, may contribute to health risks from BTX exposure.

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Area of Science:

  • Environmental Health
  • Epigenetics
  • Toxicology

Background:

  • Occupational exposure to benzene, toluene, and xylene (BTX) is prevalent in Chinese workplaces.
  • Chronic benzene exposure is linked to hematological malignancies, but mechanisms remain unclear.

Purpose of the Study:

  • To investigate changes in poly(ADP-ribosyl)ation and DNA methylation in workers exposed to BTX.
  • To explore the relationship between BTX exposure levels and epigenetic modifications.

Main Methods:

  • Blood DNA and exposure data collected from 132 decorators, 129 painters, and 130 unexposed referents.
  • Personal air monitoring for BTX, hematological parameter measurement, and cytokinesis-block micronucleus (CBMN) assay.
  • Quantitative real-time PCR for mRNA expression of PARP1, PARG, DNMTs (DNMT1, DNMT3a, DNMT3b), and MBD2; PARP activity assay.

Main Results:

  • Significantly higher airborne BTX levels in exposed groups compared to controls.
  • Decreased expression of PARP1, DNMTs, and MBD2, along with reduced PARP activity in exposed workers.
  • Decreased gene expression correlated with increased airborne BTX levels; no significant differences in hematological parameters or CBMN assay results.

Conclusions:

  • Decreased DNMTs, MBD2, and PARP1 may be involved in global hypomethylation due to BTX exposure.
  • PARP/PARG imbalance might contribute to the downregulation of DNMTs.
  • This study is the first to link altered poly(ADP-ribosyl)ation patterns in humans to chronic occupational BTX exposure.