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Environ Health Perspect. 2010 Mar;118(3):370-4. doi: 10.1289/ehp.0901131. Epub 2009 Nov 6.

Association of low-dose exposure to persistent organic pollutants with global DNA hypomethylation in healthy Koreans.

Author information

1
Department of Preventative Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.

Abstract

BACKGROUND:

Global DNA methylation levels have been reported to be inversely associated with blood levels of persistent organic pollutants (POPs), xenobiotics that accumulate in adipose tissue. Whether these associations extend to a population with much lower concentrations of POPs is not known.

OBJECTIVES:

This study was performed to examine whether low-dose exposure to POPs was associated with global DNA hypomethylation in Koreans.

METHODS:

The amount of global DNA hypomethylation was estimated by the percent 5-methyl-cytosine (%5-mC) in Alu and LINE-1 assays in 86 apparently healthy Koreans. Among various POPs, organochlorine (OC) pesticides, polychlorinated biphenyls (PCBs), and polybrominated diphenylethers (PBDEs) were measured.

RESULTS:

Most OC pesticides were inversely and significantly associated with %5-mC in the Alu assay, with correlation coefficients in the range 0.2 to 0.3 after adjusting for age, sex, body mass index, smoking, and alcohol. The strongest OC pesticide associations with %5-mC in the Alu assay were observed with oxychlordane, trans-nonachlor, and p,p -dichlorodiphenyldichloroethylene. The correlation coefficient of age with %5-mC in the Alu assay was 0.24, similar to correlations of OC pesticides with %5-mC in the Alu assay. Most PCBs and PBDEs showed nonsignificant inverse trends with %5-mC in the Alu assay, but for some PCBs the U-shaped association was significant. On the other hand, POPs were not associated with %5-mC in the LINE-1 assay.

CONCLUSIONS:

We found that low-dose exposure to POPs, in particular OC pesticides, was associated with global DNA hypomethylation in apparently healthy Koreans.

PMID:
20064773
PMCID:
PMC2854765
DOI:
10.1289/ehp.0901131
[Indexed for MEDLINE]
Free PMC Article

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