Residential Proximity to Major Roadways at Birth, DNA Methylation at Birth and Midchildhood, and Childhood Cognitive Test Scores: Project Viva(Massachusetts, USA)

Cheng Peng, Martijn den Dekker, Andres Cardenas, Sheryl L. Rifas-Shiman, Heike Gibson, Golareh Agha, Maria H. Harris, Brent A. Coull, Joel Schwartz, Augusto A. Litonjua, Dawn L. DeMeo, Marie-France Hivert (+9 others)
2018 Environmental Health Perspectives  
BACKGROUND: Epigenetic variability is hypothesized as a regulatory pathway through which prenatal exposures may influence child development and health. OBJECTIVE: We sought to examine the associations of residential proximity to roadways at birth and epigenome-wide DNA methylation. We also assessed associations of differential methylation with child cognitive outcomes. METHODS: We estimated residential proximity to roadways at birth using a geographic information system (GIS) and cord blood
more » ... and cord blood methylation using Illumina's HumanMethylation450-array in 482 mother-child pairs in Project Viva. We identified individual CpGs associated with residentialproximity-to-roadways at birth using robust linear regression [false discovery rate ðFDRÞ < 0:05]. We also estimated association between proximityto-roadways at birth and methylation of the same sites in blood samples collected at age 7-11 y (N = 415). We ran the same analyses in the Generation R Study for replication (N = 641). In Project Viva, we investigated associations of differential methylation at birth with midchildhood cognition using linear regression. RESULTS: Living closer to major roadways at birth was associated with higher cord blood (and-more weakly-midchildhood blood) methylation of four sites in LAMB2. For each halving of residential-proximity-to-major-roadways, we observed a 0.82% increase in DNA methylation at cg05654765 [95% confidence interval (CI): (0.54%, 1.10%)], 0.88% at cg14099457 [95% CI: (0.56%, 1.19%)], 0.19% at cg03732535 [95% CI: (0.11%, 0.28)], and 1.08% at cg02954987 [95% CI: (0.65%, 1.51%)]. Higher cord blood methylation of these sites was associated with lower midchildhood nonverbal cognitive scores. Our results did not replicate in the Generation R Study. CONCLUSIONS: Our discovery results must be interpreted with caution, given that they were not replicated in a separate cohort. However, living close to major roadways at birth was associated with cord blood methylation of sites in LAMB2-a gene known to be linked to axonal development-in our U.S. cohort. Higher methylation of these sites associated with lower nonverbal cognitive scores at age 7-11 y in the same children. https://doi.
doi:10.1289/ehp2034 pmid:30226399 fatcat:oxf67q3g3bhu5i427vjg2qslg4