Increased brain radiodensity in alcoholism. A co-twin control study

Area of Science:

• Neuroscience
• Genetics
• Addiction Research

Background:

• Alcohol dependence is a complex disorder with potential neurobiological underpinnings.
• Twin studies are valuable for disentangling genetic and environmental influences on alcoholism.
• Previous research suggests structural brain changes associated with chronic alcohol use.

Purpose of the Study:

• To investigate the impact of severe and less severe alcohol dependence on brain density in monozygotic twins.
• To compare brain radiodensity between alcohol-dependent twins and their non-dependent co-twins.
• To examine hemispheric differences in brain density in relation to alcoholism.

Main Methods:

• Utilized computed tomography (CT) scans to measure brain radiodensity.
• Compared monozygotic (identical) twins discordant for alcohol dependence.
• Analyzed brain density in specific regions: frontal lobes, caudate nuclei, and thalamic nuclei.
• Assessed hemispheric differences in the caudate nucleus.

Main Results:

• Severely alcohol-dependent twins exhibited significantly increased brain density in the frontal lobes, caudate, and thalamic nuclei compared to their normal-drinking co-twins.
• No significant differences in brain radiodensity were observed in twins with less severe alcoholism.
• A reduction, but not elimination, of the normal left caudate greater density was noted in alcoholics.

Conclusions:

• Severe alcohol dependence is associated with increased brain density in key brain regions.
• The neurobiological effects of alcohol dependence may be dose- or severity-dependent.
• Hemispheric asymmetry in the caudate nucleus is altered by severe alcoholism.