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Differential DNA methylation and metabolite profiling of Atlantic killifish (Fundulus heteroclitus) from the New Bedford Harbor Superfund site

Journal Article · · Ecotoxicology
 [1];  [2];  [3];  [4];  [4];  [5];  [1]
  1. University of Seoul (Korea, Republic of)
  2. Korea Environment Institute (Korea, Republic of)
  3. University of Seoul (Korea, Republic of); International Iberian Nanotechnology Laboratory (INL), Braga (Portugal)
  4. US Environmental Protection Agency USEPA), Narragansett, RI (United States). Center for Environmental Measurement and Modeling
  5. Pusan National Univ., Busan (Korea, Republic of)

Atlantic killifish (Fundulus heteroclitus) is a valuable model in evolutionary toxicology to study how the interactions between genetic and environmental factors serve the adaptive ability of organisms to resist chemical pollution. Killifish populations inhabiting environmental toxicant-contaminated New Bedford Harbor (NBH) show phenotypes tolerant to polychlorinated biphenyls (PCBs) and differences at the transcriptional and genomic levels. However, limited research has explored epigenetic alterations and metabolic effects in NBH killifish. To identify the involvement of epigenetic and metabolic regulation in the adaptive response of killifish, we investigated tissue- and sex-specific differences in global DNA methylation and metabolomic profiles of NBH killifish populations, compared to sensitive populations from a non-polluted site, Scorton Creek (SC). The results revealed that liver-specific global DNA hypomethylation and differential metabolites were evident in fish from NBH compared with those from SC. The sex-specific differences were not greater than the tissue-specific differences. We demonstrated liver-specific enriched metabolic pathways (e.g., amino acid metabolic pathways converged into the urea cycle and glutathione metabolism), suggesting possible crosstalk between differential metabolites and DNA hypomethylation in the livers of NBH killifish. Additional investigation of methylated gene regions is necessary to understand the functional role of DNA hypomethylation in the regulation of enzyme-encoding genes associated with metabolic processes and physiological changes in NBH populations.

Research Organization:
Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USEPA; National Research Foundation of Korea
Grant/Contract Number:
SC0014664
OSTI ID:
2471334
Journal Information:
Ecotoxicology, Journal Name: Ecotoxicology Journal Issue: 1 Vol. 33; ISSN 0963-9292
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)