Cytidine deaminase cdna as a positive selectable marker for...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/55 (2006.01) A61K 35/28 (2006.01) A61K 38/50 (2006.01) C12N 9/78 (2006.01) C12N 15/65 (2006.01) C12N 15/86 (2006.01) A61K 48/00 (2006.01)

Patent

CA 2228378

The present invention relates to a DNA sequence for the human cytidine deaminase that has been engineered into an eukaryotic expression vector, thereby permitting cytidine deaminase expression in mammalian cells. Cytidine deaminase expression confers resistance to cytosine nucleoside analogs, such as cytosine arabinoside, and can be used as a positive selectable marker. The expression of cytidine deaminase in cells protects them from the toxic effects of cytosine nucleoside analogs. Such a resistance provides applications for gene therapy of malignant, immune and viral diseases. A bacterial expression vector containing the gene can be used to produce cytidine deaminase in large quantities.

Séquence d'ADN codant la cytidine déaminase humaine insérée par technique génétique dans un vecteur d'expression eucaryote, qui permet l'expression de la cytidine déaminase dans les cellules de mammifères. L'expression de la cytidine déaminase confère une résistance aux analogues de nucléosides à cytosine, tels que l'arabinoside de cytosine, et peut être utilisée comme marqueur positif pouvant être sélectionné. L'expression de la cytidine déaminase dans les cellules protège celles-ci contre les effets toxiques des analogues de nucléosides à cytosine. Cette résistance trouve des applications dans la thérapie génique d'affections malignes, immunitaires et virales. Un vecteur d'expression bactérienne contenant ce gène peut être utilisé pour la production de cytidine déaminase en grandes quantités.

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