Discovery could aid early screening, shed light on how Chiari malformation arises.
About one in 100 children has a common brain disorder called Chiari 1 malformation, but most of the time such children grow up normally and no one suspects a problem. But in about one in 10 of those children, the condition causes headaches, neck pain, hearing, vision and balance disturbances, or other neurological symptoms.
In some cases, the disorder may run in families, but scientists have understood little about the genetic alterations that contribute to the condition. In new research, scientists at Washington University School of Medicine in St. Louis have shown that Chiari 1 malformation can be caused by variations in two genes involved in brain development.
The condition occurs when the lowest parts of the brain are found below the base of the skull. The study also revealed that children with unusually large heads are four times more likely to be diagnosed with Chiari 1 malformation than their peers with normal head circumference.
The findings, published Dec. 21 in the American Journal of Human Genetics, could lead to new ways to identify people at risk of developing Chiari 1 malformation before the most serious symptoms arise. It also sheds light on the development of the common but poorly understood condition.
“A lot of times people have recurrent headaches, but they don’t realize a Chiari malformation is the cause of their headaches,” said senior author Gabriel Haller, PhD, an assistant professor of neurosurgery, of neurology and of genetics. “And even if they do, not everyone is willing to have brain surgery to fix it. We need better treatments, and the first step to better treatments is a better understanding of the underlying causes.”
If people start experiencing severe symptoms like chronic headaches, pain, abnormal sensations or loss of sensation, or weakness, the malformation is treated with surgery to decompress the Chiari malformation.
“There’s an increased risk for Chiari malformations within families, which suggests a genetic underpinning, but nobody had really identified a causal gene,” Haller said. “We were able to identify two causal genes, and we also discovered that people with Chiari have larger head circumference than expected. It’s a significant factor, and easy to measure. If you have a child with an enlarged head, it might be worth checking with your pediatrician.”
To identify genes that cause Chiari 1 malformation, Haller and colleagues sequenced all the genes of 668 people with the…