Process for large scale production of plasmid dna by e. coli...

C - Chemistry – Metallurgy – 12 – P

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C12P 19/34 (2006.01) C12Q 1/02 (2006.01)

Patent

CA 2554534

The present invention relates generally to a method for increasing the yield of plasmid DNA production. The method includes the steps of selecting a highly productive clonal subtype of a strain of E. coli, including but not limited to the DH5 strain, harboring a DNA plasmid and cultivating said clonal subtype with fed-batch fermentation in a chemically-defined medium. The plasmid DNA production process described herein can generate record quantities of plasmid DNA when said highly productive clonal subtypes are cultivated on an industrial scale. The disclosed method can be used for the production of pharmaceutical grade DNA for use in polynucleotide vaccination and gene therapy treatment regimens.

La présente invention se rapporte de manière générale à un procédé d'accroissement du rendement d'une production d'ADN plasmidique. Ce procédé comprend les étapes consistant à sélectionner un sous-type clonal fortement producteur d'une souche de E. coli, notamment mais pas exclusivement de la souche DH5, à héberger un plasmide d'ADN et à cultiver ledit sous-type clonal par fermentation à écoulement discontinu dans un milieu défini chimiquement. Ce procédé de production d'ADN plasmidique de l'invention peut permettre la production de quantités jamais atteintes d'ADN plasmidique lorsque lesdits sous-types clonaux fortement producteurs sont cultivés à une échelle industrielle. Le procédé de la présente invention peut être mis en oeuvre pour la production d'ADN convenant pour un usage pharmaceutique destiné à une vaccination polynucléotidique et à des schémas posologiques utilisés dans des programmes de thérapie génique.

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