Polybrominated diphenyl ethers in relation to autism and developmental delay: a case-control study.

Area of Science:

• Environmental Health
• Neurodevelopmental Disorders
• Toxicology

Background:

• Polybrominated diphenyl ethers (PBDEs) are flame retardants increasingly used in the U.S.
• PBDEs cross the placenta and rodent studies indicate neurodevelopmental toxicity from prenatal exposure.
• Children are exposed to PBDEs through breastfeeding and hand-to-mouth activities.

Purpose of the Study:

• To investigate the association between Polybrominated Diphenyl Ethers (PBDEs) and autism spectrum disorder (ASD) in children.
• To evaluate PBDE congener levels in children diagnosed with autism, developmental delay, and typically developing controls.

Main Methods:

• A case-control study involving 100 children from the CHildhood Autism Risk from Genetics and the Environment (CHARGE) Study.
• Autism and developmental delay diagnoses confirmed using standardized assessments.
• Gas chromatography/mass spectrometry used to measure eleven PBDE congeners in serum samples; logistic regression analyzed associations.

Main Results:

• No significant differences in PBDE congener levels were found between children with autism/developmental delay and typically developing controls.
• All participant groups exhibited high levels of PBDEs, indicating widespread exposure.
• Current plasma PBDE levels did not correlate with autism diagnosis in this cohort.

Conclusions:

• Plasma samples collected post-diagnosis may not accurately reflect early-life PBDE exposures.
• Further research measuring prenatal or infant exposures is necessary to determine a causal role for PBDEs in autism spectrum disorders.
• The study highlights the need for longitudinal studies to understand the impact of early environmental exposures on neurodevelopment.