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U-M researchers discover way to block neurodegeneration in an adult form of Fragile X syndrome
Date:12/13/2010

Ann Arbor, Mich. Expression of a toxic RNA that leads to Fragile X Tremor Ataxia Syndrome is modifiable by genetic or pharmacologic means, according to new research from U-M Medical School scientists.

In the study published online today in the journal Public Library Of Science Genetics, U-M's Peter K. Todd, M.D., Ph.D., led a team of researchers who examined the expression of a toxic messenger RNA (mRNA) seen in the brains of those afflicted with the syndrome.

Fragile X Tremor Ataxia Syndrome (FXTAS) is usually found in older adults, who often have grandchildren afflicted with Fragile X. Those affected with the adult form of the syndrome have slow gait, tremors, dementia and balance problems. The symptoms are caused by overproduction of a toxic mRNA in the brain that causes neurodegeneration.

"We found that the expression of this toxic mRNA is dynamic and modifiable," says Todd, who is an assistant professor in U-M's Department of Neurology. "There is a potential for modifying the increased production of the toxic RNA with drugs that inhibit histone acetylation."

FXTAS is an under-diagnosed syndrome that was only discovered about 10 years ago, when researchers discovered the grandfathers of children with Fragile X were displaying common symptoms. It is one of three known Fragile X disorders that result from changes in the Fragile X gene. The altered gene can be passed down through generations, affecting both genders at different stages in life.

About 1 in 3,000 men and about 1 in 5,200 women in the general population will develop symptoms of FXTAS, according to the National Fragile X Foundation. Current estimates suggest that about 30-40 percent of male Fragile X gene carriers over 50 years of age, within families already known to have someone with a Fragile X-associated disorder, will ultimately exhibit some features of FXTAS.

Fragile X is the most common cause of developmental delay in boys and is the most common known single gene c
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Contact: Mary F. Masson
mfmasson@umich.edu
734-764-2220
University of Michigan Health System
Source:Eurekalert

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