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Sigma® Life Science Creates World's First Knock-in Rats using Zinc Finger Nuclease Technology
Date:12/13/2010

ST. LOUIS, Dec. 13, 2010 /PRNewswire-FirstCall/ -- Sigma Life Science, the innovative biological products and services business of Sigma-Aldrich® (Nasdaq: SIAL), today announced that its SAGE Labs initiative has successfully used its proprietary CompoZr® Zinc Finger Nuclease (ZFN) technology to generate knock-in rats in which foreign genes have been inserted, or 'knocked-in', into the rat genome in a precisely targeted manner.  This breakthrough achievement represents a major step forward in the creation of a transgenic animal, which may serve as more predictive models of human disease.

In a proof of concept study conducted by researchers at SAGE Labs, a copy of the green fluorescent protein (GFP) was inserted in a targeted fashion into the Mdr1a gene of a rat, thus creating a rat that glows under special lighting conditions.  The study, which has recently been accepted for publication(1), opens the doors to a variety of new applications including the tagging of genes with reporters such as GFP to measure gene expression patterns and replacement of rat genes with humanized versions.

Although rats have long been the model organism of choice for disease research, scientists have been forced to use mouse models for over a quarter of a century, due to their amenability to genetic manipulation. The creation of rats with gene deletions, commonly called 'knock-outs', using ZFN technology was first published in Science in 2009(2), and the ability to create rats with new genes introduced in their genome represents a leap forward in ZFN technology, allowing sophisticated genetic engineering of higher level organisms and providing scientists with a choice of model organisms that can be used to investigate different diseases.

Sigma Life Science's CompoZr® ZFN technology is the only technique that has repeatedly been shown to make highly targe
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SOURCE Sigma-Aldrich
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