Air pollution exposure is associated with gene expression in children

Area of Science:

• Environmental epigenetics
• Pediatric environmental health
• Molecular epidemiology

Background:

• Environmental exposures like air pollution and limited green spaces negatively impact children's health.
• Gene expression changes are a potential mechanism linking environmental factors to health outcomes.
• Understanding these molecular pathways is crucial for developing targeted interventions.

Purpose of the Study:

• To investigate the association between environmental exposures and gene expression in children.
• To identify specific genes and biological pathways affected by pollutants such as particulate matter (PM2.5, PM10), and nitrogen dioxide.
• To explore the role of green and blue spaces in modulating gene expression.

Main Methods:

• Utilized whole-blood gene expression data from the Dutch Generation R Study (n=172).
• Performed follow-up analysis with lymphoblastoid cell line gene expression from the ALSPAC Study (n=946).
• Employed gene set enrichment analysis (GSEA) to identify affected biological pathways, adjusting for covariates.

Main Results:

• Particulate matter (PM2.5) exposure was associated with the expression of 86 genes in the discovery cohort.
• A specific gene, GNG11, showed consistent PM2.5-associated expression changes in both cohorts.
• GSEA revealed that PM2.5 exposure suppressed gene sets involved in interferon responses and microbial infections.

Conclusions:

• Gene expression analysis in two independent cohorts suggests a link between PM2.5 exposure and altered immune responses in children.
• PM2.5 may impact the interferon pathway and susceptibility to bacterial and viral infections.
• This research highlights the potential of gene expression as a biomarker for environmental health effects in pediatric populations.