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Summary

Epigenetics explores how environmental factors influence gene expression across generations, impacting sociosexual behaviors. Understanding molecular versus molar and context-dependent versus germline-dependent epigenetics is crucial for behavioral neuroendocrinology research.

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Area of Science:

Behavioral neuroendocrinology
Developmental psychology
Genetics

Background:

Individual differences in sociosexual behavior arise from gene-environment interactions throughout life history.
Emerging evidence suggests transgenerational influences on behavior, mediated by epigenetic mechanisms.
Epigenetics studies environmental effects on the genome without altering DNA sequence.

Purpose of the Study:

To clarify key distinctions in epigenetic research relevant to behavioral neuroendocrinology.
To review rodent models illustrating genetic and environmental contributions to sociosexual behavior.
To explore the implications of epigenetic inheritance for behavior and evolution.

Main Methods:

Distinguishing between Molecular and Molar epigenetics.
Differentiating Context-Dependent and Germline-Dependent epigenetic modifications.
Analyzing rodent models, including genetically-modified mice and a novel rat model with germline imprinting.

Main Results:

Early life environment (litter effects) in mice alters brain activity and subsequent behavior.
A rat model demonstrates permanent epigenetic imprinting that affects descendants across generations.
These models highlight the interplay of genetics and environment in shaping sociosexual behaviors.

Conclusions:

Clear distinctions between epigenetic perspectives (molecular vs. molar) and transmission mechanisms (context-dependent vs. germline-dependent) are essential.
Rodent models provide valuable insights into the developmental and transgenerational effects of epigenetics on behavior.
Past environmental events can have profound mechanistic, behavioral, and evolutionary consequences through epigenetic pathways.