Angelman syndrome is a neurological genetic disorder that affects physical and intellectual abilities.

Around 90% of Angelman syndrome patients experience seizures. They usually appear between ages 18 months and 2 years and may be triggered by high temperatures or fever. Angelman syndrome patients may experience different types of seizures:

How Angelman syndrome causes seizures

Nerve cells in the brain communicate with one another via electrical signals. These cells also send signals to different parts of the body to control movements. Seizures occur when nerve cells transmit sudden uncontrolled bursts of electrical signals, which can trigger other nerve cells to fire additional bursts.

Neuronal function is controlled by the inhibition and excitation of nerve cells by neurotransmitters, or cell-signaling molecules. One such neurotransmitter is GABA. It acts by binding to GABA receptors and inhibits the activity of nerve cells.

It is not exactly understood how Angelman syndrome causes seizures. But researchers think that it is caused by a shift of balance toward too much excitation in nerve cells in the brain.

In Angelman syndrome patients, a part of the maternal chromosome 15 is inactive or deleted. Among other genes, the ubiquitin ligase E3A (UBE3A) gene and genes that provide instructions to build different parts of the GABA receptor reside in this region. Because GABA requires GABA receptors to perform its function, their absence may shift the balance of inhibition and excitation of nerve cells, resulting in seizures.

Seizure treatment

Seizures in Angelman syndrome patients are challenging to treat and often refractory to therapy. However, in some cases, they may be controlled with anticonvulsants.

Valproic acid and levetiracetam are frequently used, and these two medications have relatively high response rates.

Clonazepam, phenobarbital, topiramate, carbamazepine, lamotrigine, and phenytoin are also commonly used.

The ketogenic diet and vagus nerve stimulation can also be effective in controlling seizures in Angelman syndrome patients.

 

Last updated: Sept. 15, 2019

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Angelman Syndrome News is strictly a news and information website about the disease. It does not provide medical advice, diagnosis, or treatment. This content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. 

 

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Özge has a MSc. in Molecular Genetics from the University of Leicester and a PhD in Developmental Biology from Queen Mary University of London. She worked as a Post-doctoral Research Associate at the University of Leicester for six years in the field of Behavioural Neurology before moving into science communication. She worked as the Research Communication Officer at a London based charity for almost two years.