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UC Davis Researchers Find How Viral Infection Disrupts Neural Development in Offspring, Increasing Risk of Autism
Date:9/19/2013

Sacramento, CA (PRWEB) September 19, 2013

Activating a mother’s immune system during her pregnancy disrupts the development of neural cells in the brain of her offspring and damages the cells' ability to transmit signals and communicate with one another, researchers with the UC Davis Center for Neuroscience and Department of Neurology have found. They said the finding suggests how maternal viral infection might increase the risk of having a child with autism spectrum disorder or schizophrenia.

The research, “MHCI Requires MEF2 Transcription Factors to Negatively Regulate Synapse Density during Development and in Disease,” is published in the Journal of Neuroscience.

The study’s senior author is Kimberley McAllister, professor in the Center for Neuroscience with appointments in the departments of Neurology and Neurobiology, Physiology and Behavior, and a researcher with the UC Davis MIND Institute.

“This is the first evidence that neurons in the developing brain of newborn offspring are altered by maternal immune activation,” McAllister said. “Until now, very little has been known about how maternal immune activation leads to autism spectrum disorder and schizophrenia-like pathophysiology and behaviors in the offspring.”

The study was conducted in mice and rats and compared the brains of the offspring of rodents whose immune systems had been activated and those of animals whose immune systems had not been activated. The pups of animals that were exposed to viral infection had much higher brain levels of immune molecules known as the major histocompatibility complex I (MHCI) molecules.

“This is the first evidence that MHCI levels on the surface of young cortical neurons in offspring are altered by maternal immune activation,” McAllister said.

The researchers found that the high MHCI levels impaired the ability of the neurons from the newborn mice’s brains to form synapses, t
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