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Autism's origins: Mother's antibody production may affect fetal brain
Date:2/25/2008

The mothers of some autistic children may have made antibodies against their fetuses brain tissue during pregnancy that crossed the placenta and caused changes that led to autism, suggests research led by Johns Hopkins Childrens Center investigators and published in the February issue of the Journal of Neuroimmunology.

The causes of autism, a disorder manifesting itself with a range of brain problems and marked by impaired social interactions, communication disorders and repetitive behaviors, remain unknown for an estimated 90 percent of children diagnosed with it. Genetic, metabolic and environmental factors have been implicated in various studies of autism, a disorder affecting 1 in 150 U.S. children, according to estimates by the Centers for Disease Control and Prevention.

Now our research suggests that the mothers immune system may be yet another factor or a trigger in those already predisposed, says lead investigator Harvey Singer, M.D., director of pediatric neurology at Hopkins Childrens.

Researchers caution that the findings neednt be cause for alarm, but should be viewed instead as a step forward in untangling the complex nature of autism.

Mostly anecdotal past evidence of immune system involvement has emerged from unusual antibody levels in some autistic children and from postmortem brain tissue studies showing immune abnormalities in areas of the brain. Antibodies are proteins the body makes in response to viruses and bacteria or sometimes mistakenly against its own tissues. Yet, the majority of children with autism have no clinical evidence of autoimmune diseases, which prompted researchers to wonder whether the antibodies transferred from mother to child during pregnancy could interfere with the fetal brain directly.

To test their hypothesis, the research team used a technique called immunoblotting (or Western blot technology), in which antibodies derived from blood samples are exposed to adult
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Contact: Ekaterina Pesheva
epeshev1@jhmi.edu
410-516-4996
Johns Hopkins Medical Institutions
Source:Eurekalert

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