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Epileptic seizures may be linked to an ancient gene family
Date:8/1/2010

ylor College of Medicine, the team used an electroencephalography (EEG) device to monitor the brains of mice. They found that mice missing the Kv12.2 gene did indeed have frequent seizures, albeit without convulsions. The team then stimulated mice with a chemical that induces convulsive seizures. They found that normal mice had a much higher convulsive-seizure threshold than mice with a defective Kv12.2 gene. The team also found the same results when they used a chemical inhibitor to block the Kv12.2 potassium channel in normal mice.

"In mice without a functioning Kv12.2 gene, nerve cells had abnormally low firing thresholds. Even small stimuli caused seizures," Jegla explained. "We think that this potassium channel plays a role in the brain's ability to remain 'quiet' and to respond selectively to strong stimuli."

Jegla hopes to open up new avenues of epilepsy research by studying whether activation of the Kv12.2 potassium channel in normal animals can block seizures. "Ion-channel defects have been identified in inherited seizure disorders, but many types of epilepsy don't have a genetic cause to begin with," Jegla explained. "They are often caused by environmental factors, such as a brain injury or a high fever. However, the most effective drugs used to treat epilepsy target ion channels. If we can learn more about how ion channels influence seizure thresholds, we should be able to develop better drugs with fewer side effects."


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Contact: Barbara K. Kennedy
science@psu.edu
814-863-4682
Penn State
Source:Eurekalert  

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Epileptic seizures may be linked to an ancient gene family
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