Incorporating Transgenerational Epigenetic Inheritance into Ecological Risk Assessment Frameworks

Area of Science:

• Ecotoxicology
• Epigenetics
• Environmental Science

Background:

• Chronic contaminant exposure may cause heritable epigenetic changes across generations.
• Transgenerational epigenetic inheritance is proposed for inclusion in ecological risk assessments.
• Existing literature presents limited compelling evidence for widespread contaminant-induced epigenetic inheritance.

Purpose of the Study:

• To critically evaluate the evidence for transgenerational epigenetic inheritance of contaminant effects.
• To identify limitations in current study designs and propose improvements for future research.
• To develop a framework for assessing and incorporating transgenerational epigenetic effects into ecotoxicological risk assessment.

Main Methods:

• Critical review of existing literature on transgenerational epigenetic effects of contaminants.
• Identification of methodological needs, including multigenerational studies beyond direct exposure and increased replication.
• Proposal for a regulatory framework and experimental design for assessing epigenetic inheritance.

Main Results:

• Current evidence for contaminant-induced transgenerational epigenetic inheritance is often weak and lacks compelling support.
• Existing studies frequently fail to adequately assess recovery times or account for epigenetic variability.
• There is a need to correlate epigenetic endpoints with observable organismal effects.

Conclusions:

• Contaminant-induced epigenetic inheritance may be less prevalent than suggested by current literature.
• Future research requires robust multigenerational designs, increased replication, and focus on ecologically relevant endpoints.
• A refined regulatory framework is proposed to better assess transgenerational epigenetic risks in ecotoxicology.