The sequenced rat brain transcriptome--its use in identifying networks predisposing alcohol consumption

Area of Science:

• Genetics
• Neuroscience
• Systems Biology

Background:

• Understanding the genetic basis of alcohol consumption is crucial for addressing alcohol use disorders.
• Quantitative genetic approaches correlate gene expression with phenotypic traits.

Purpose of the Study:

• To identify genetic factors and biological functions contributing to alcohol consumption predisposition.
• To explore gene co-expression networks associated with alcohol preference in rat models.

Main Methods:

• Combined DNA-Seq, RNA-Seq, and brain exon array data in recombinant inbred and selectively bred rat lines.
• Reconstructed rat brain transcriptome and quantified transcript expression levels.
• Generated co-expression modules and identified differentially expressed genes.

Main Results:

• Identified a brain gene co-expression module associated with alcohol consumption in recombinant inbred rats.
• This module was enriched with differentially expressed genes in selectively bred high and low alcohol-preferring rat lines.
• Candidate genes were linked to glial cells, immune function, metabolism, calcium homeostasis, and glial-neuronal communication.

Conclusions:

• Multiple genetic factor combinations can result in similar alcohol consumption phenotypes.
• Coordinated differential expression of gene subsets within identified pathways underlies alcohol consumption predisposition.
• No single gene solely determines alcohol consumption levels across all models.