The ON-TARGETplus Druggable Genome library contains the genes that are considered potential targets for therapeutics, including kinases, proteases, phosphatases, GPCRs, ion channels, ubiquitin ligases, and genes involved in senescence, autophagy, DNA repair, and characterized nuclear receptors, This extensive library is delivered as nine distinct subset siRNA libraries in the 96-well format. In the 384-well format the first eight subsets are plated continuously to reduce partial plates.
The ON-TARGETplus siRNA designs and modifications reduce off-target effects while maintaining high silencing potency for high-confidence screening results.
- Patented dual-strand ON-TARGETplus modification pattern on all siRNAs to reduce off-targets
- Sense strand is modified to prevent interaction with RISC and favor antisense strand uptake
- Antisense strand seed region is modified to destabilize off-target activity and enhance target specificity
- Available as SMARTpool siRNA reagents or a Set of 4 siRNAs in 96- or 384-well plates
- Guaranteed target gene knockdown (see Specifications tab)
Nine subsets make up the human druggable genome siRNA Library
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To support high-throughput screening environments, pre-defined and custom siRNA libraries in 384-well format may be provided in plates compatible with the Labcyte Echo acoustic liquid handler upon request (*PP-0200 Echo Qualified 384-Well Polypropylene Microplate (384PP)).
Our siRNA knockdown guarantee
siGENOME and ON-TARGETplus siRNA reagents (SMARTpool and three of four individual siRNAs) are guaranteed to silence target gene expression by at least 75% at the mRNA level when demonstrated to have been used under optimal delivery conditions (confirmed using validated positive control and measured at the mRNA level 24 to 48 hours after transfection using 100 nM siRNA).
Note: Most siGENOME and ON-TARGETplus siRNA products are highly functional at 5 to 25 nM working concentration.
Druggable Genome siRNA Library
The Druggable Genome library contains the genes that are considered potential targets for therapeutics, and is delivered as nine distinct subset siRNA libraries in the 96-well format. In the 384-well format the first eight subsets are plated continuously to reduce partial plates. The Drug Targets portion includes genes involved with apoptosis, senesence, nucleic acid binding, autophagy, DNA repair, and characterized nuclear receptors.
False phenotypes due to off-targets are alleviated by ON-TARGETplus SMARTpool reagents while target gene knockdown is maintained
The effect of silencing ARPC1B on cell migration was studied in a breast cancer cell line. A monolayer of cells was uniformly scraped and the rate of cell migration to close the scrape (wound healing) was evaluated. Both unmodified and ON-TARGETplus siRNA reagents induced potent target knockdown. Inconsistent phenotypes due to off-target effects (red outline), were observed for cells transfected with unmodified individual siRNAs. The unmodified SMARTpool improved the false phenotype considerably, while the ON-TARGETplus SMARTpool significantly reduced off-target effects to produce a consistent phenotype. In collaboration with Kaylene Simpson, Laura Selfors, and Joan Brugge, Harvard Medical School
ON-TARGETplus modifications reduce the overall number of off-targets and pooling reduces them even further
(A) and (B) are representative examples of off-target signatures with and without application of ON-TARGETplus modifications to (A) a single siRNA and (B) a SMARTpool reagent. Green bars indicate genes with 2-fold or more reduction of expression when treated with the indicated siRNA reagent. The ON-TARGETplus modifications reduced the off-targets when compared to unmodified siRNA. Pooling of siRNA and the ON-TARGETplus modification pattern independently, and in combination, provide significant reduction in off-target gene silencing. Panel (C) represents quantitation of off-targets (down-regulated by 2-fold or more) induced by the indicated siRNA reagents targeting 10 different genes (4 siRNAs per gene or a single SMARTpool reagent). Off-targets were quantified using microarray analysis (Agilent) then compiled. Each shaded box represents the middle 50% of the data set. Horizontal line in box: Median value of the data set. Vertical bars: minimum and maximum data values.
- A. L. Hopkins, How many drug targets are there? Nature Reviews Drug Discovery. 5(12), 993-996 (December 2006).
- K. R. Sakharkar, Targetability of human disease genes. Current Drug Discovery Technologies. 4(1), 48-58 (June 2007).
General Screening References
- B.D. Parsons, A. Schindler, D.H. Evans, E. Foley, A direct phenotypic comparison of siRNA pools and multiple individual duplexes in a functional assay. PLoS One. 4(12), e8471 (2009).
- M. Jiang, R. Instrell, B. Saunders, H. Berven, M. Howell, Tales from an academic RNAi screening facility; FAQs. Brief Funct. Genomics. 10(4), 227-237 (2011). [doi: 10.1093/bfgp/elr016]
- J. Borawski, A. Lindeman, F. Buxton, M. Labow, L.A. Gaither, Optimization procedure for small interfering RNA transfection in a 384-well format. J. Biomol. Screen. 12(4), 546-559 (2007).
- T. Ratovitski, E. Chighladze, E. Waldron, R. R. Hirschhorn, C. A. Ross, Cysteine proteases bleomycin hydrolase and cathepsin Z mediate N-terminal proteolysis and toxicity of mutant huntingtin. J. Biol. Chem. 286(14), 12578-12589 (2011). [Human Proteases]
Concentrated buffer solution recommended for resuspension and long-term storage of any short, double-strand, or single-strand synthetic RNA molecule. Dilute with RNase-free water prior to use.
Molecular grade water for dilution of 5x siRNA Buffer or resuspension of RNA. RNase-free to prevent degradation of RNA reagents and oligonucleotides.
An aliquot of each of the four DharmaFECT formulations for siRNA/microRNA transfection optimization studies
Negative control pool of four siRNAs designed and microarray tested for minimal targeting of human, mouse or rat genes. ON-TARGETplus modifications reduce potential off-targets. Recommended for determination of baseline cellular responses in RNAi experiments.