Enhanced expression

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/82 (2006.01)

Patent

CA 2545687

Disclosed herein are methods and means of achieving enhanced expression of a target nucleotide sequence in a transgenic organism, which methods comprise the steps of: (i) providing an organism in which post-transcriptional gene silencing (PTGS) is suppressed, (ii) associating said target nucleotide sequence with one or more heterologous Matrix Attachment Region (MARs), and (iii) causing or permitting expression from the target nucleotide sequence in the organism. Unexpectedly, the MARs do not merely relieve gene silencing, but can actually lead to expression levels higher than can be achieved in wild- type organisms and higher than expression levels in organisms in which PTGS is suppressed but where the MARs are not employed.

L'invention concerne des méthodes et des moyens permettant d'obtenir une expression améliorée d'une séquence nucléotidique cible dans un organisme transgénique, lesquelles méthodes comprennent les étapes consistant: (i) à produire un organisme dans lequel le silençage génique post-transcription (PTGS) est supprimé, (ii) à associer ladite séquence nucléotidique cible à une ou à plusieurs régions de fixation de matrice (MAR) hétérologue, et (iii) à provoquer ou à permettre l'expression à partir de la séquence nucléotidique cible dans l'organisme. De façon inattendue, les MAR ne diminuent pas simplement le silençage génique, elles peuvent effectivement conduire à des niveaux d'expression supérieurs pouvant être obtenus chez des organismes de type sauvage et supérieurs à des niveaux d'expression chez des organismes dans lesquels le PTGS est supprimé mais dans lesquels les MAR ne sont pas utilisées.

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