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Researchers identify proteins involved in new neurodegenerative syndrome
Date:8/15/2007

The interplay of two proteins that bind to messenger RNA, a molecule that mediates translation of the information encoded in genes into proteins, triggers the appearance of fragile X-associated tremor/ataxia syndrome (FTAX), a late-life disorder associated with the gene that causes fragile X syndrome in children, said researchers from Baylor College of Medicine in Houston and Emory University School of Medicine in a report that appears today in the journal Neuron.

They are two different diseases, but they are related to one gene, said Dr. Juan Botas, associate professor of molecular and human genetics at BCM. Fragile X syndrome is the most common inherited form of mental retardation. It occurs in one in 4,000 males and one in 6,000 females.

The ways in which the two disorders occur differ. In both, the gene FMR1 contains too many repeats of the tri-nucleotide CGG. Those with fragile X syndrome have more than 200 repeats, causing the person to lack the fragile X mental retardation protein (FMRP) encoded by the gene. Those who develop fragile X-associated tremor/ataxia syndrome later in life have a premutation set of repeats of CGG totaling between 60 and 200. These individuals make the FMRP protein and do not develop fragile X syndrome. Previously, it was thought that 60-200 repeats had no effect on premutation carrier individuals. Now it appears that it does affect a subset of carriers, although it is unclear how many.

People with fragile X-associated tremors/ataxia syndrome suffer from tremor that becomes more severe over time. They have difficulty with walking and balance. Their disease can progress slowly over years until they have difficulty carrying out the activities of daily life. It is found in the grandfathers of children with fragile X syndrome, and it often begins when people are in the 50s and 60s. Most of those with the disease are men.

Researchers noticed that people with the fragile X-associated tremor/ataxia s
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Contact: Kimberlee Barbour
kbarbour@bcm.edu
713-798-4712
Baylor College of Medicine
Source:Eurekalert

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