Hair Toxic Metal Concentrations and Autism Spectrum Disorder Severity in Young Children

Institute of Chronic Illnesses, 14 Redgate Ct, Silver Spring, MD 20905, USA. .
International Journal of Environmental Research and Public Health (Impact Factor: 2.06). 12/2012; 9(12):4486-4497. DOI: 10.3390/ijerph9124486
Source: PubMed


Previous studies have found a higher body-burden of toxic metals, particularly mercury (Hg), among subjects diagnosed with an autism spectrum disorder (ASD) in comparison to neurotypical controls. Moreover, Hg body-burden was associated with ASD severity. This cross-sectional study examined the potential correlation between hair toxic metal concentrations and ASD severity in a prospective cohort of participants diagnosed with moderate to severe ASD. The Institutional Review Board at the University of Texas Southwestern Medical Center at Dallas (Dallas, TX) approved the present study. Qualifying study participants (n = 18) were evaluated for ASD severity using the Childhood Autism Rating Scale (CARS) and quantitatively for arsenic, Hg, cadmium, lead, chromium, cobalt, nickel, aluminum, tin, uranium, and manganese using hair toxic element testing by Doctor's Data (a CLIA-approved laboratory). CARS scoring and hair toxic element testing were blinded to one another. Increasing hair Hg concentrations significantly correlated with increased ASD severity. In contrast, no significant correlations were observed between any other of the hair toxic metals examined and ASD severity. This study helps to provide additional mechanistic support for Hg in the etiology of ASD severity, and is supported by an increasing number of recent critical reviews that provide biological plausibility for the role of Hg exposure in the pathogenesis of ASDs.

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Available from: Mark R Geier, Oct 08, 2015
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    • "Mercury (Hg) concentration ranged from 0.12 to 85.9 mg@BULLETL −1 with an average of 18.94 mg@BULLETL −1 (Table 1, Figure 1). Pb and Hg are linked with neurodevelopment problems and possible autistic disorders in children [10] [11]. Six percent of the samples contained Hg concentration above the allowable value (Table 1). "
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    • "These studies indicate that children with autism have a decreased ability to excrete toxic metals, leading to a higher body burden. Moreover, studies show that Hg body-burden is associated with increased ASD severity (Lakshmi Priya and Geetha 2011, Elsheshtawy et al. 2011, Geier et al. 2012, Adams et al. 2013). "
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