Genetic variation contributes to gene expression response in ischemic stroke: an eQTL study

Area of Science:

• Genomics
• Neuroscience
• Immunology

Background:

• Single nucleotide polymorphisms (SNPs) are implicated in complex disorders like ischemic stroke (IS).
• SNPs may influence IS by altering gene expression, a phenomenon studied as expression quantitative trait loci (eQTL).

Purpose of the Study:

• To investigate the association between common SNPs and changes in mRNA expression in blood following IS.
• To identify specific eQTLs that are altered in IS patients compared to controls.

Main Methods:

• RNA and DNA were isolated from 137 IS patients and 138 vascular risk factor controls (VRFC).
• Gene expression was measured using microarrays, and SNP variants were assessed.
• A linear model analyzed genotype × diagnosis interactions for SNP-gene pairs.

Main Results:

• Significant genotype × diagnosis interactions were found for 4 cis-eQTL and 70 trans-eQTL SNP-gene pairs.
• Key cis-eQTLs involved inflammatory response genes (NRGN, CXCL10, SMAD4, CD38) crucial for IS.
• A significant trans-eQTL for ANOS1 was identified, potentially important for neural repair after stroke.

Conclusions:

• Genetic variation significantly contributes to the regulation of gene expression following IS.
• The inflammatory response to stroke is partly modulated by genetic variations.
• Identified genes represent potential therapeutic targets for personalized IS treatment strategies.