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Consortium develops new method enabling routine targeted gene modification
Date:7/24/2008

A multi-institutional team led by Massachusetts General Hospital (MGH) investigators has developed a powerful new tool for genomic research and medicine a robust method for generating synthetic enzymes that can target particular DNA sequences for inactivation or repair. In the July 25 issue of Molecular Cell, the researchers describe an efficient, publicly available method to engineer customized zinc-finger nucleases (ZFNs), which can be used to induce specific genomic modifications in many types of cells.

"Recent work has shown that ZFNs can alter genes with high efficiency in cells from plants or model organisms like fruitflies, roundworms and zebrafish, and in human cells," says J. Keith Joung, MD, PhD, of the MGH Molecular Pathology Unit, the paper's senior author. "However, a significant bottleneck has been the lack of access to an effective method for generating the customized DNA-binding domains needed to guide ZFNs to their target sites. Our method will enable academic researchers to rapidly create high quality ZFNs for genes of interest and will stimulate use of this technology in biological research and potentially gene therapy."

Zinc-finger peptides, which bind to DNA, occur naturally in many important proteins that regulate or otherwise interact with DNA. Zinc-finger nucleases are constructed from synthetic "designer" zinc-finger domains targeted to a specific genetic sequence and another protein segment that breaks both DNA strands within the binding site. Currently available methods for generating ZFNs are either inefficient or involve constructing and analyzing huge libraries of zinc-finger peptides, a task that exceeds the capabilities of all but a handful of laboratories in the world.

First author Morgan L. Maeder of the Joung lab led an effort by researchers from six institutions that demonstrated how this new method (termed OPEN for Oligomerized Pool ENgineering) can rapidly generate ZFNs that induc
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Contact: Sue McGreevey
smcgreevey@partners.org
617-724-2764
Massachusetts General Hospital
Source:Eurekalert

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