Suppression of endogenous immunoglobulin expression in...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/85 (2006.01) A01K 67/027 (2006.01) C07K 14/085 (2006.01) C07K 16/00 (2006.01) C12N 9/00 (2006.01) C12N 15/62 (2006.01)

Patent

CA 2584814

The invention provides anovel approach for the suppression of endogenous antibody expression in non-human transgenic animals genetically engineered to express one or several human or humanized immunoglobulin transloci. Endogenous immunoglobulin expression in transgenic non-human animals is suppressed by selective expression of a suicide gene like a toxin only in B-cells expressing endogenous immunoglobulin but not in B-cells expressing human(ized) immunoglobulins. This method allows the dominant expression of transloci coding for humanized or human antibodies in the blood, milk and eggs of transgenic animals.

L'invention concerne une nouvelle approche destinée à la suppression de l'expression d'un anti-corps endogène chez des animaux transgéniques non humains génétiquement modifiés de manière à exprimer un ou plusieurs transloci d'immunoglobulines humanisés ou humains. L'expression d'immunoglobulines endogènes chez des animaux non humains transgéniques est supprimée par expression sélective d'un gène suicide similaire à une toxine, uniquement, dans des cellules B exprimant une immunoglobuline endogène, mais non dans des cellules B exprimant des immunoglobulines humanisées. Cette méthode permet l'expression dominante des transloci codant des anticorps humanisés ou humains dans le sang, le lait et les oeufs d'animaux transgéniques.

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