Exon microarray analysis of human dorsolateral prefrontal cortex in alcoholism.

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• Alcohol abuse causes biochemical disturbances affecting protein and nucleic acid synthesis, brain development, and behavior.
• Genetic factors and alcohol consumption significantly influence gene expression.
• Understanding these genetic influences is crucial for characterizing alcoholism.

Purpose of the Study:

• To investigate the genetic influences in alcoholism.
• To examine the effects of alcohol consumption on gene expression in the human frontal cortex.

Main Methods:

• Messenger RNA (mRNA) was isolated from the dorsolateral prefrontal cortex (dlPFC) of 7 alcoholic and 7 control subjects.
• Affymetrix Human Exon 1.0 ST microarray was used to analyze mRNA expression.
• Microarray findings were validated using quantitative reverse transcription polymerase chain reaction (RT-qPCR) and Ingenuity Pathway Analysis (IPA).

Main Results:

• Decreased mRNA expression was observed for genes involved in cellular adhesion, transport, nervous system development, and signaling.
• Genes influencing lipid and myelin synthesis showed reduced expression.
• IPA revealed network disturbances associated with neurological disease, development, and psychological disorders.

Conclusions:

• Alcoholism is associated with reduced expression of dlPFC mRNA in genes vital for neuronal growth and differentiation.
• These gene expression changes specifically impact the brain's white matter.
• The findings underscore the molecular underpinnings of alcoholism's effects on brain structure and function.