Expression of active human factor ix in mammary tissue of...

A - Human Necessities – 61 – K

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A61K 38/00 (2006.01) A61K 48/00 (2006.01) C12N 5/00 (2006.01) C12N 9/00 (2006.01) C12N 9/64 (2006.01) C12N 15/00 (2006.01) C12N 15/85 (2006.01) C12P 21/04 (2006.01)

Patent

CA 2280700

Recombinant Factor IX characterized by a high percentage of active protein can be obtained in the milk of transgenic animals that incorporate chimeric DNA molecules according to the present invention. Transgenic animals of the present invention are produced by introducing into developing embryos DNA that encodes Factor IX, such that the foreign DNA is stably incorporated in the DNA of germ line cells of the mature animal. Particularly efficient expression was accomplished using a chimeric construct comprising a mammary gland specific promoter, Factor IX cDNA that lacked the complete or any portion of the 5'- untranslated and 3'-untranslated region, which is substituted with a 5'- and 3'- end of the mouse whey acidic protein gene. In vitro cell cultures of cells explanted from the transgenic mammal of the invention and methods of producing Factor IX from such said culture and methods of treating hemophilia B are also described.

On peut obtenir le facteur IX, recombiné et caractérisé par un pourcentage élevé de protéine active, dans le lait d'animaux transgéniques comprenant des molécules d'ADN chimérique selon l'invention. On produit les animaux transgéniques de la présente invention en introduisant dans des embryons en cours de développement de l'ADN codant le facteur IX, de façon que l'ADN étranger soit incorporé de façon stable dans l'ADN de lignées cellulaires germinales de l'animal adulte. On a obtenu une expression particulièrement efficace à l'aide d'une construction chimérique comprenant un promoteur spécifique des glandes mammaires, l'ADNc du facteur IX, auquel manquait la totalité ou une quelconque portion de la région 5'- non traduite et 3'- non traduite, laquelle région est substituée par une extrémité 5'- et 3'- du gène de la protéine acide du lactosérum de la souris. L'invention concerne également des cultures cellulaires in vitro d'explants cellulaires provenant de l'animal transgénique, des procédés de production du facteur IX à partir d'une telle culture, ainsi que des procédés de traitement de l'hémophilie B.

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