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Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants

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Environmental chemical exposures and human epigenetics.

Lifang Hou¹, Xiao Zhang, Dong Wang

¹Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA. l-hou@northwestern.edu

International Journal of Epidemiology

|January 19, 2012

Summary

Environmental pollutants cause millions of deaths and diseases by inducing epigenetic variations, such as DNA methylation changes. Understanding these environmental epigenomics alterations is crucial for disease prevention and biomarker development.

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Area of Science:

Environmental Health
Epigenetics
Toxicology

Background:

Environmental pollutants contribute to over 13 million deaths annually and cause approximately 24% of global diseases.
Growing evidence links environmental exposures to epigenetic alterations, including DNA methylation, histone modifications, and microRNAs.

Purpose of the Study:

To summarize epigenetic alterations associated with environmental chemical exposures.
To propose mechanisms by which environmental exposures induce epigenetic changes.
To discuss future directions for environmental epigenomics research.

Main Methods:

Literature review and synthesis of existing research on environmental epigenetics.
Analysis of proposed mechanisms linking environmental chemicals to epigenetic modifications.
Discussion of epidemiological research challenges and opportunities.

Main Results:

Environmental pollutants induce epigenetic variations (DNA methylation, histone modifications, microRNAs) implicated in disease etiology.
Epigenetic modifications may serve as biomarkers for exposure and disease risk.
Numerous epigenetic modifications from toxicants are reported, though direct links to disease endpoints require further investigation.

Conclusions:

Environmental epigenomics offers insights into disease etiology and prevention strategies.
Methodological challenges in environmental epigenomics research need addressing, including temporal stability, tissue specificity, and data analysis.
Further research is essential to bridge the gap between environmental toxicant-induced epigenetic changes and specific disease outcomes.