Nature Genetics 37, 1289 - 1295 (2005)
Published online: 2 October 2005; | doi:10.1038/ng1651
Probing tumor phenotypes using stable and regulated synthetic microRNA precursorsRoss A Dickins1, 2, Michael T Hemann2, Jack T Zilfou2, David R Simpson3, Ingrid Ibarra2, Gregory J Hannon1, 2, 3
& Scott W Lowe1, 2, 31
Howard Hughes Medical Institute, 1 Bungtown Road, Cold Spring Harbor, New York 11724, USA. 2
Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, New York 11724, USA. 3
Watson School of Biological Sciences, 1 Bungtown Road, Cold Spring Harbor, New York 11724, USA.
Correspondence should be addressed to Scott W Lowe lowe@cshl.edu RNA interference is a powerful method for suppressing gene expression in mammalian cells. Stable knock-down can be achieved by continuous expression of synthetic short hairpin RNAs, typically from RNA polymerase III promoters. But primary microRNA transcripts, which are endogenous triggers of RNA interference, are normally synthesized by RNA polymerase II. Here we show that RNA polymerase II promoters expressing rationally designed primary microRNA–based short hairpin RNAs produce potent, stable and regulatable gene knock-down in cultured cells and in animals, even when present at a single copy in the genome. Most notably, by tightly regulating Trp53 knock-down using tetracycline-based systems, we show that cultured mouse fibroblasts can be switched between proliferative and senescent states and that tumors induced by Trp53 suppression and cooperating oncogenes regress upon re-expression of Trp53. In practice, this primary microRNA–based short hairpin RNA vector system is markedly similar to cDNA overexpression systems and is a powerful tool for studying gene function in cells and animals.
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