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Crescendo Biologics Announces First 'Triple Knockout' Mouse
Date:9/29/2010

mice which retain intact lambda light chain. While lambda light chain accounts for at most 10% of the light chains in mouse antibodies, Crescendo believes that knockout of all light chain expression is critical for the efficient generation of human heavy chain antibodies in transgenic mice. The new knockout mouse thus offers an enhanced background for the generation of new antibody therapeutics and is a key step in the establishment of Crescendo's world-leading VH antibody fragment platform. VH fragments are the smallest fragments that retain antibody binding, and have many desirable properties as potential therapeutics.

In a parallel development, Crescendo has also demonstrated the potential of its first generation yeast artificial chromosome (YAC) with the successful expression of human antibodies. Working with Professor Lluis Montoliu at the Centro Nacional de Biotecnologia (a centre belonging to the Spanish National Research Council, CSIC) in Madrid, transgenic mice have been generated by oocyte microinjection with a first YAC comprising several human V genes, all human D and J genes and a C region engineered for expression in the absence of light chains. This YAC has been shown to rearrange and express human antibodies in wild type mice.

"Today's announcement marks an important milestone in the development of our highly innovative antibody fragment technology," said Mike Romanos, CSO of Crescendo Biologics. "We have successfully delivered what we believe to be a unique asset in our triple knockout mice, and have also made significant steps in the generation of YACs which direct the production of human heavy chain antibodies. When combined, and with further developments in our YAC technology, we believe we will have the strongest platform for the generation of new VH fragment therapeutics and can harness the great benefits they will bring as therapeutics."

The Crescendo approach is aimed at bringing together two highly desirable character
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SOURCE Crescendo Biologics Ltd
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