Global and gene-specific promoter methylation changes are related toanti-B[a]PDE-DNA adduct levels and influence micronuclei levels in polycyclic aromatic hydrocarbon-exposed individuals

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We investigated the effect of chronic exposure to polycyclic aromatic hydrocarbons (PAHs) on DNA methylation states (percentage of methylated cytosines (%mC)) in Polish male nonsmoking coke-oven workers and matched controls. Methylation states of gene-specific promoters (p53,p16,HIC1andIL-6) and ofAluandLINE-1repetitive elements, as surrogate measures of global methylation, were quantified by pyrosequencing in peripheral blood lymphocytes (PBLs). DNA methylation was evaluated in relation to PAH exposure, assessed by urinary 1-pyrenol and anti-benzo[a]pyrene diolepoxide (anti-B[a]PDE)-DNA adduct levels, a critical genetic damage from B[a]P. We also evaluated whether PAH-induced DNA methylation states were in turn associated with micronuclei in PBLs, an indicator of chromosomal instability. © 2009 UICC

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