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UC Davis investigators achieve important step toward treating Huntington's disease
Date:1/19/2012

uarter of a million Americans. The disorder can be passed down through families even if only one parent has the abnormal huntingtin gene. The disease is caused by a mutation in the gene, which is comprised of an abnormally repeating building block of DNA that appears on the fourth chromosome. While the building block pattern normally repeats up to 28 times on the chromosome, too many repeats cause an abnormal form of protein -- known as the huntingtin protein -- to be made. The huntingtin protein accumulates in the brain, causing the disease's devastating progression. Individuals usually develop symptoms in middle age if there are more than 35 repeats. A more rare form of the disease occurs in youth when the abnormal DNA pattern repeats many more times.

The UC Davis research team showed for the first time that inhibitory RNA sequences can be transferred directly from donor cells into target cells to greatly reduce unwanted protein synthesis from the mutant gene. To transfer the inhibitory RNA sequences into their targets, Nolta's team genetically engineered mesenchymal stem cells (MSCs), which were derived from the bone marrow of unaffected human donors. Over the past two decades, Nolta and her colleagues have shown MSCs to be safe and effective vehicles to deliver enzymes and proteins to other cells. She said finding that MSCs can also transfer RNA molecules directly from cell to cell, in amounts sufficient to reduce levels of a mutant protein by over 50 percent in the target cells, is a discovery that has never been reported before and offers great promise for a variety of disorders.

"Not only is finding new treatments for Huntington's disease a worthwhile pursuit on its own, but the lessons we are learning are applicable to developing new therapies for other genetic disorders that involve excessive protein development and the need to reduce it," said Nolta, who recently received a prestigious Transformative Research Grant from the National Ins
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Contact: Charles Casey
charles.casey@ucdmc.ucdavis.edu
916-734-9048
University of California - Davis Health System
Source:Eurekalert

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