Exposure to air pollution appears to increase the risk for autism among people who carry a genetic disposition for the neurodevelopmental disorder.
“Our research shows that children with both the risk genotype and exposure to high air pollutant levels were at increased risk of autism spectrum disorder compared to those without the risk genotype and lower air pollution exposure,” says the study’s first author, Heather E. Volk, assistant professor of research in preventive medicine and pediatrics at the Keck School of Medicine of the University of Southern California (USC) and principal investigator at The Saban Research Institute of Children’s Hospital Los Angeles.
Autism spectrum disorder (ASD) is highly heritable, suggesting that genetics are an important contributing factor, but many questions about its causes remain.
“Although gene-environment interactions are widely believed to contribute to autism risk, this is the first demonstration of a specific interaction between a well-established genetic risk factor and an environmental factor that independently contribute to autism risk,” says Daniel B. Campbell, assistant professor of psychiatry and the behavioral sciences at the Keck School of Medicine and the study’s senior author.
“The MET gene variant has been associated with autism in multiple studies, controls expression of MET protein in both the brain and the immune system, and predicts altered brain structure and function. It will be important to replicate this finding and to determine the mechanisms by which these genetic and environmental factors interact to increase the risk for autism.”
Independent studies by Volk and Campbell have previously reported associations between autism and air pollution exposure and between autism and a variant in the MET gene. The current study, which is scheduled to appear in the January 2014 edition of Epidemiology, suggests that air pollution exposure and the genetic variant interact to augment the risk of ASD.
Campbell and Volk’s team, including Irva Hertz-Picciotto of the University of California, Davis, studied 408 children between 2 and 5 years of age from the Childhood Autism Risks From Genetics and the Environment Study, a population-based, case-control study of preschool children from California. Of those, 252 met the criteria for autism or autism spectrum disorder.
Air pollution exposure was determined based on the past residences of the children and their mothers, local traffic-related sources, and regional air quality measures. MET genotype was determined through blood sampling.
Campbell and Volk continue to study the interaction of air pollution exposure and the MET genotype in mothers during pregnancy.
The National Institute of Environmental Health Sciences, the MIND Institute, and Autism Speaks supported the research.