Epigenetic Applications in Adverse Outcome Pathways and Environmental Risk Evaluation

Area of Science:

• Environmental toxicology
• Epigenetics
• Risk assessment

Background:

• The epigenome acts as a crucial interface between environmental chemical exposures and human health.
• Current understanding often shows correlative links between epigenetic modifications and health outcomes, lacking causal evidence.
• The Adverse Outcome Pathway (AOP) framework offers a science-based approach to establish causal relationships between exposures, epigenetics, and adverse health effects.

Purpose of the Study:

• To discuss the epigenome's role in modifying exposure effects and risks.
• To explore integrating toxicoepigenetic data into the AOP framework.
• To examine tools for epigenetic toxicity assessment and AOP-guided integration into risk assessment.

Main Methods:

• Utilizing the Adverse Outcome Pathway (AOP) framework for causal inference.
• Organizing epigenetic information within AOP networks.
• Qualitative analysis of epigenetic modifications and their impact on biological systems.

Main Results:

• AOP frameworks can help elucidate how systems respond to environmentally induced epigenetic modifications.
• Substantive challenges exist in assessing biological plausibility and linking epigenetic effects to health outcomes.
• Obstacles include understanding complex epigenetic interactions and the vast number of chemicals requiring evaluation.

Conclusions:

• Epigenetic information within AOP frameworks can support biological plausibility assessments.
• This integration can identify data gaps and accelerate the application of epigenetic data in chemical evaluation and risk assessment.
• The AOP framework provides a structured approach to advance the use of epigenetics in understanding environmental health impacts.