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Scripps Florida scientists design molecule that reverses some fragile X syndrome defects
Date:9/4/2012

JUPITER, FL - Scientists on the Florida campus of The Scripps Research Institute have designed a compound that shows promise as a potential therapy for one of the diseases closely linked to fragile X syndrome, a genetic condition that causes mental retardation, infertility, and memory impairment, and is the only known single-gene cause of autism.

The study, published online ahead of print in the journal ACS Chemical Biology September 4, 2012, focuses on tremor ataxia syndrome, which usually affects men over the age of 50 and results in Parkinson's like-symptomstrembling, balance problems, muscle rigidity, as well as some neurological difficulties, including short-term memory loss and severe mood swings.

With fragile X syndrome, tremor ataxia syndrome, and related diseases, the root of the problem is a structural motif known as an "expanded triplet repeat"in which a series of three nucleotides are repeated more times than normal in the genetic code of affected individuals. This defect, located in the fragile X mental retardation 1 (FMR1) gene, causes serious problems with the processing of RNA.

"While there is an abundance of potential RNA drug targets in disease, no one has any idea how to identify or design small molecules to target these RNAs," said Mathew Disney, a Scripps Research associate professor who led the study. "We have designed a compound capable of targeting the right RNA and reversing the defects that cause fragile X-associated tremor ataxia."

Preventing Havoc

In tremor ataxia syndrome, the expanded triplet repeat leads to the expression of aberrant proteins that wreak widespread havoc. The repeats actually force the normal proteins that regulate RNA splicingnecessary for production of the right kind of proteinsinto hiding.

The compound designed by Disney and his colleagues not only improves the RNA splicing process, but also minimizes the ability of repeats to wreak havoc on
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Contact: Mika Ono
mikaono@scripps.edu
858-784-2052
Scripps Research Institute
Source:Eurekalert  

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