Polycistronic RNA polymerase II expression vectors for RNA interference based on BIC/miR-155.

Nucleic Acids Research
Kwan-Ho ChungDavid L Turner

Abstract

Vector-based RNA interference (RNAi) has emerged as a valuable tool for analysis of gene function. We have developed new RNA polymerase II expression vectors for RNAi, designated SIBR vectors, based upon the non-coding RNA BIC. BIC contains the miR-155 microRNA (miRNA) precursor, and we find that expression of a short region of the third exon of mouse BIC is sufficient to produce miR-155 in mammalian cells. The SIBR vectors use a modified miR-155 precursor stem-loop and flanking BIC sequences to express synthetic miRNAs complementary to target RNAs. Like RNA polymerase III driven short hairpin RNA vectors, the SIBR vectors efficiently reduce target mRNA and protein expression. The synthetic miRNAs can be expressed from an intron, allowing coexpression of a marker or other protein with the miRNAs. In addition, intronic expression of a synthetic miRNA from a two intron vector enhances RNAi. A SIBR vector can express two different miRNAs from a single transcript for effective inhibition of two different target mRNAs. Furthermore, at least eight tandem copies of a synthetic miRNA can be expressed in a polycistronic transcript to increase the inhibition of a target RNA. The SIBR vectors are flexible tools for a variety of RNAi appli...Continue Reading

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Datasets Mentioned

BETA
AY096003

Methods Mentioned

BETA
transfection
transgenic
PCR
transfections
Immunoprecipitation

Software Mentioned

Signal Analytics
VueScan
Adobe Photoshop
PrimerBank
ImageJ
IPLab Gel H

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