# Dysregulation of Central–Medial Amygdala Histone Modifiers in Preclinical Models of Ethanol Exposure

## TL;DR

This review explores how ethanol exposure affects the central–medial amygdala's epigenetic and transcriptional changes, offering insights into alcohol use disorder mechanisms and potential treatments.

## Contribution

The paper provides a comprehensive overview of ethanol-induced epigenetic dysregulation in the central–medial amygdala and proposes potential therapeutic targets.

## Key findings

- Ethanol exposure models reveal epigenetic changes in the central–medial amygdala linked to neuroadaptation.
- Acute, chronic-intermittent, and chronic-continuous ethanol exposure protocols show distinct effects on gene expression and neuronal activity.
- Potential epigenetic targets for therapeutic intervention in alcohol use disorder are identified.

## Abstract

This narrative review examines recent advances in understanding the epigenetic and transcriptional dynamics of the central–medial amygdala across different stages of ethanol use. It covers the various models and protocols of ethanol administration, emphasizing their strengths and limitations in helping understand ethanol‐induced changes in brain and behaviour. The findings from protocols utilizing acute, chronic‐intermittent ethanol (CIE) and chronic‐continuous ethanol (CCE) exposure are summarized into a proposed mechanism of epigenetic dysregulation and neuroadaptation, spanning from initial ethanol exposure to withdrawal and its influence on gene expression and neuronal activity. This review also explores potential epigenetic targets for therapeutic intervention. Understanding the mechanisms that underlie histone remodelling during initial ethanol exposure, chronic exposure, and withdrawal has the potential to elucidate novel cessation strategies tailored to specific stages of alcohol use disorder (AUD).

This narrative review examines the epigenetic and transcriptional dynamics of the central–medial amygdala across stages of ethanol use. It outlines acute, chronic intermittent, and chronic continuous ethanol exposure models, highlighting their strengths and limitations for understanding ethanol‐induced changes in brain and behaviour. The findings from protocols utilizing these models are summarized into a proposed mechanism of epigenetic dysregulation and neuroadaptation from initial exposure to withdrawal. The review also explores epigenetic targets for therapeutic intervention in alcohol use disorder.