Expression systems for stem-loop rna molecule having rnai...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/11 (2006.01) A01K 67/027 (2006.01) A61K 31/7088 (2006.01) A61K 48/00 (2006.01) C12N 1/19 (2006.01) C12N 5/10 (2006.01) C12N 15/85 (2006.01) C12Q 1/02 (2006.01) C12Q 1/68 (2006.01)

Patent

CA 2484079

It is found out that, by producing a stem loop RNA molecule form a DNA encoding this RNA molecule with the use of a tRNA promoter, the RNA molecule can be efficiently transferred into cytoplasm to thereby exert the RNAi effect. Also, the RNAi effect can be efficiently exerted by transferring a cytoplasm transfer signal sequence into a DNA encoding a stem loop RNA molecule. Moreover, the RNAi effect can be efficiently exerted by transferring a transcriptional product into cytoplasm with the use of a pol II-type promoter. In this case, cytotoxicity can be reduced by co-expressing a Dicer gene. Furthermore, an effective dsRNA can be constructed by treating a dsRNA or stem loop RNA molecule with Dicer protein. Use of these stem loop RNA molecule expression system makes it possible to conveniently construct knockout cells lacking a desired gene.

Il s'est avéré que, en produisant une molécule d'ARN à tige-boucle à partir d'un ADN codant cette molécule d'ARN au moyen d'un promoteur d'ARNt, la molécule d'ARN peut être transférée efficacement dans le cytoplasme afin d'exercer l'effet ARNi. L'effet ARNi peut également être exercé efficacement par transfert d'une séquence de signaux de transfert du cytoplasme dans un ADN codant une molécule d'ARN à tige-boucle. De plus, l'effet ARNi peut être efficacement exercé par transfert d'un produit de transcription dans le cytoplasme au moyen d'un promoteur de type pol II. Dans ce cas la cytotoxicité peut être réduite par co-expression d'un gène Dicer. En outre, il est possible de construire un ARNds efficace en traitant un ARNds ou une molécule d'ARN à tige-boucle avec une protéine Dicer. L'utilisation de ces systèmes d'expression de molécules d'ARN à tige-boucle permet de construire efficacement des cellules d'extinction dépourvues d'un gène souhaité.

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