Transcriptomic and genetic studies identify NFAT5 as a candidate gene for cocaine dependence

Area of Science:

• Neuroscience
• Genetics
• Pharmacology

Background:

• Cocaine's effects on reward and reinforcement are primarily mediated by dopaminergic neurotransmission.
• SH-SY5Y-differentiated cells serve as a model for dopaminergic neurons.

Purpose of the Study:

• To investigate gene expression changes in dopaminergic cells following acute cocaine exposure.
• To identify genetic variations associated with cocaine dependence.

Main Methods:

• Acute cocaine exposure on SH-SY5Y-differentiated cells to assess gene expression and neuronal activity.
• Analysis of 756 differentially expressed genes, focusing on signaling pathways.
• Case-control association study of single-nucleotide polymorphisms (SNPs) in cocaine-dependent patients and controls.

Main Results:

• Cocaine exposure at 5 μM, but not 1 μM, induced significant gene expression changes and increased neuronal activity.
• Identified 756 genes involved in transcription, cell cycle, and MAPK, CREB, neurotrophin, and neuregulin signaling.
• Five SNPs in the NFAT5 gene's 3'-untranslated region were associated with cocaine dependence, with rs1437134 showing significant association after Bonferroni correction.

Conclusions:

• The NFAT5 gene, upregulated by cocaine exposure, may contribute to the genetic predisposition for cocaine dependence.
• A specific NFAT5 SNP (rs1437134) affects gene expression and is linked to cocaine dependence.
• NFAT5 variation did not correlate with brain volumes in addiction-relevant regions.