Dna binding protein and sequence as insulators having...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/63 (2006.01) A61K 48/00 (2006.01) C07K 14/46 (2006.01) C12N 9/10 (2006.01) C12N 15/85 (2006.01)

Patent

CA 2377929

An insulator element shown to be both necessary and sufficient for the enhancer blocking activity in human cells is described. The insulator element of the invention is a 42 base pair DNA molecule having specific enhancer blocking activity for regulation of gene expression. The insulator element has also been shown to be the core binding site for CTCF, a DNA binding protein that is highly conserved in vertebrates. In addition, an insulator element containing CTCF binding sites has been identified in the region of the Igf 2 locus which is methylated exclusively on the paternal allele. Methylation of the insulator sequence abolishes the ability of CTCF to bind to the insulator and results in loss of enhancer-blocking activity.

L'invention se rapporte à un élément isolant qui s'est avéré à la fois nécessaire et suffisant pour présenter une activité de blocage d'amplificateurs dans des cellules humaines. Cet élément isolant est une molécule d'ADN à 42 paires de base présentant une activité de blocage d'amplificateurs spécifiques qui permet la régulation d'une expression génique. Cet élément isolant s'est également avéré être le site principal de liaison à la protéine CTCF, une protéine de liaison à l'ADN qui est fortement conservée chez les vertébrés. En outre, un élément isolant comportant des sites de liaison à la protéine CTCF a été identifié dans la région du locus Igf2 qui est méthylé exclusivement sur l'allèle paternel. La méthylation de la séquence isolante supprime la capacité de liaison à l'isolant de la protéine CTCF et se traduit par une perte d'activité de blocage des amplificateurs.

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