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New gene therapy technique on iPS cells holds promise in treating immune system disease
Date:4/28/2011

o mature neutrophils that failed to produce hydrogen peroxide, thus expressing the disease trait. This is the first study in which the disease phenotype has been reproduced in neutrophils differentiated from X-CGD patient-specific iPS cells.

After discovering that the disease could be reproduced in cell culture, the researchers then sought to correct the disease and produce healthy neutrophils in culture. They used synthetic proteins called zinc finger nucleases (ZFNs) to target a corrective gene at a specifically defined location in the genome of the X-CGD iPS cells. The iPS cells were then carefully screened to identify those containing a single copy of the corrective gene properly inserted only at the safe site. The researchers observed that some of the gene-corrected iPS cells could differentiate into neutrophils that produced normal levels of hydrogen peroxide, effectively "correcting" the disease.

"This is the first study that uses ZFNs in specific targeting gene transfer to correct X-CGD,"said Dr. Malech. "Demonstrating that this approach to gene therapy works with a single-gene disease such as X-CGD means that the results from our study offer not only a potential treatment for this disease, but more importantly, a technique by which other single-gene diseases can be corrected using specifically targeted gene therapy on iPS cells."


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Contact: Claire Gwayi-Chore
webmaster@hematology.org
202-552-4914
American Society of Hematology
Source:Eurekalert

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