Cited by 352Epigenetics and DNA MethylationToxic Organic Pollutants ImpactPesticide Exposure and Toxicity

Global DNA Hypomethylation Is Associated with High Serum-Persistent Organic Pollutants in Greenlandic Inuit

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Rusiecki, Jennifer A., Baccarelli, Andrea, Bollati, Valentina, Tarantini, Letizia, Moore, Lee E., Bonefeld-Jorgensen, Eva C.·2008·Environmental Health Perspectives

Abstract

Background: Persistent organic pollutants (POPs) may influence epigenetic mechanisms; therefore, they could affect chromosomal stability and gene expression. DNA methylation, an epigenetic mechanism, has been associated with cancer initiation and progression. Greenlandic Inuit have some of the highest reported POP levels worldwide. Objective: Our aim in this study was to evaluate the relationship between plasma POPs concentrations and global DNA methylation (percent 5-methylcytosine) in DNA extracted from blood samples from 70 Greenlandic Inuit. Blood samples were collected under the Arctic Monitoring and Assessment Program and previously analyzed for a battery of POPs. Methods: We used pyrosequencing to estimate global DNA methylation via Alu and LINE-1 assays of bisulfite-treated DNA. We investigated correlations between plasma POP concentrations and global DNA methylation via correlation coefficients and linear regression analyses. Results: We found inverse correlations between percents methylcytosine and many of the POP concentrations measured. Linear regressions, adjusting for age and cigarette smoking, showed statistically significant inverse linear relationships mainly for the Alu assay for p,p′-DDT (1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane; β = −0.26), p,p′-DDE [1,1-dichloro-2,2-bis(p-chlorophenyl) ethylene; β = −0.38], β-hexachlorocyclohexane (β = −0.48), oxychlordane (β = −0.32), α-chlordane (β = −0.75), mirex (β = −0.27), sum of polychlorinated biphenyls (β = −0.56), and sum of all POPs (β = −0.48). Linear regressions for the LINE-1 assay showed β estimates of similar magnitudes to those using the Alu assay, however, none was statistically significant. Conclusions: This is the first study to investigate environmental exposure to POPs and DNA methylation levels in a human population. Global methylation levels were inversely associated with blood plasma levels for several POPs and merit further investigation.

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  • A similar trend was observed in a second population of healthy Koreans for NDL PCB 153, 183, and 187 and in a population of Greenlandic Inuits.

    “A similar trend was observed in a second population of healthy Koreans for NDL PCB 153, 183, and 187 [ 37 ] and in a population of Greenlandic Inuits [ 38 ].”
  • DL and NDL PCBs have opposing actions on DNA methylation, with DL PCBs shifting the balance toward DNA hypermethylation and NDL PCBs favoring DNA hypomethylation.

    “There is evidence to suggest that the DL and NDL PCBs have opposing actions on DNA methylation, with DL PCBs shifting the balance toward DNA hypermethylation, as was observed in the Sweden study [ 39 ], and NDL PCBs favoring DNA hypomethylation as observed in the Korean and Inuit studies [ 36 , 38 ].”

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Authors
Rusiecki, J. A., Baccarelli, A., Bollati, V., Tarantini, L., Moore, L. E., & Bonefeld-Jorgensen, E. C.
Affiliations
  • Uniformed Services University of the Health Sciences (US)
  • University of Milan (IT)
  • National Institutes of Health (US)
  • University of Aarhus, Unit of Cellular and Molecular Toxicology, Centre of Arctic Environmental Medicine, Institute of Public Health, University of Aarhus, Aarhus, Denmark
Corresponding author
Rusiecki, Jennifer A.
Venue
Environmental Health Perspectives
Published
2008-07-16
Volume
116
Issue
11
Pages
1547-1552
ISSN
  • 0091-6765 (ISSN-L)
  • 1552-9924
OpenAlex
W2087008478
Cited by
352
References
51
Citations by year
2026: 2 · 2025: 6 · 2024: 8 · 2023: 9 · 2022: 15 · 2021: 24 · 2020: 21 · 2019: 24 · 2018: 19 · 2017: 23 · 2016: 26 · 2015: 30 · 2014: 23 · 2013: 32 · 2012: 34
FWCI
7.26
Type
journal article
Language
en
Open access
Locations
  • Environmental Health Perspectives (publishedVersion, public-domain)
  • PubMed Central (publishedVersion, public-domain)
  • PubMed (publishedVersion)
Funders
Uniformed Services University of the Health Sciences
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Pesticide Exposure and Toxicity
Keywords
persistent organic pollutants, global DNA methylation, DNA hypomethylation, Greenlandic Inuit, p,p'-DDE, p,p'-DDT, polychlorinated biphenyls, organochlorine pesticides, Alu elements, LINE-1 elements, epigenetics, environmental exposure, plasma concentration
MeSH terms
Adult, Aged, DNA, Environmental Pollutants, Inuit, Female, Greenland, Humans, Male, Middle Aged, Organic Chemicals, Pesticides, DNA Methylation

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