Risk and resilience for alcohol use disorder revealed in brain functional connectivity.

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• Family history of alcoholism (FH) is a significant risk factor for alcohol use disorder (AUD).
• However, many individuals with FH do not develop AUD, suggesting protective factors or resilience mechanisms.
• Understanding the neural underpinnings of risk and resilience is crucial for targeted interventions.

Purpose of the Study:

• To investigate whole-brain resting-state functional connectivity (FC) and behavioral metrics associated with AUD risk and resilience.
• To identify distinct neural networks and behavioral patterns linked to increased risk versus protective factors.
• To examine how combined risk and resilience scores predict AUD diagnosis.

Main Methods:

• Analysis of resting-state functional connectivity (FC) and behavioral data from 841 young adults (controls, AUD, unaffected siblings) from the Human Connectome Project.
• Identification of FC patterns intermediate between controls and AUD (risk) and divergent patterns (resilience) in unaffected siblings.
• Canonical correlations to link brain FC patterns with behavioral phenotypes, and calculation of "polyphenotypic" risk and resilience scores.

Main Results:

• Risk phenotypes were associated with frontal-parietal networks, correlating with executive function, impulsivity, and externalizing behaviors.
• Resilience phenotypes involved medial prefrontal, striatal, temporal, brainstem, and cerebellar networks, linked to high attention and low antisocial behavior.
• Polyphenotypic risk and resilience scores predicted AUD in a dose-dependent manner, with resilience phenotypes mitigating risk effects.

Conclusions:

• Distinct neural connectivity patterns and associated behavioral phenotypes characterize AUD risk and resilience.
• Resilience mechanisms, involving specific brain networks and behaviors, can counteract genetic predisposition to AUD.
• These findings provide brain-informed targets for developing more effective interventions for alcohol use disorder.