title: Approaches for chemically synthesized siRNA and vector-mediated RNAi.
abstract: Successful applications of RNAi in mammalian cells depend upon effective knockdown of targeted transcripts and efficient intracellular delivery of either preformed si/shRNAs or vector expressed si/shRNAs. We have previously demonstrated that 27 base pair double stranded RNAs which are substrates for Dicer can be up to 100 times more potent than 21mer siRNAs. In this mini-review we elaborate upon the rationale and design strategies for creating Dicer substrate RNAs that provide enhanced knockdown of targeted RNAs and minimize the utilization of the sense strand as RNAi effectors. Expression of shRNAs or siRNAs in mammalian cells can be achieved via transcription from either Pol II or Pol III promoters. There are certain constrictions in designing such vectors, and these are described here. Additionally, we review strategies for inducible shRNA expression and the various viral vectors that can be used to transduce shRNA genes into a variety of cells and tissues. The overall goal of this mini-review is to provide an overview of available approaches for optimizing RNAi mediated down regulation of gene expression in mammalian cells via RNA interference. Although the primary focus is the use of RNAi mediated cleavage of targeted transcripts, it is highly probable that some of the approaches described herein will be applicable to RNAi mediated inhibition of translation and transcriptional gene silencing.
authors.affiliation: Division of Molecular Biology, Beckman Research Institute of the City of Hope, 1450 East Duarte Road, Duarte, CA 91010-3011, USA.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Amarzguioui
authors.forename: John J
authors.initials: JJ
authors.lastname: Rossi
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim
mesh_terms: D000818:Animals; D001483:Base Sequence; D020868:Gene Silencing; D018014:Gene Transfer Techniques; D005821:Genetic Techniques; D005822:Genetic Vectors; D049452:Green Fluorescent Proteins / Q000378:metabolism; D006801:Humans; D035683:MicroRNAs / Q000737:chemistry; D008957:Models, Genetic; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D017434:Protein Structure, Tertiary; D012313:RNA / Q000378:metabolism; D034622:RNA Interference / Q000502:physiology*; D012320:RNA Polymerase III / Q000737:chemistry; D012333:RNA, Messenger / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism*; D043244:Ribonuclease III / Q000235:genetics; D014158:Transcription, Genetic
chemical_list: D035683:MicroRNAs; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D049452:Green Fluorescent Proteins; D012313:RNA; D012320:RNA Polymerase III; D043244:Ribonuclease III