(a) Silencer Select: “Life Technologies guarantees that when you purchase two Silencer Select Pre-designed siRNA to the same target, then those two siRNAs will silence the target mRNA by 70% or more. To qualify for the guarantee, siRNA's must have been transfected at ≥5 nM and mRNA levels detected 48h post transfection. Real-Time RT-PCR is recommended but not required for this application. Customers must also show sufficient knockdown with a positive control siRNA to demonstrate transfection efficiency. If the guaranteed level of knockdown is not observed and an appropriate positive control is successful, a new Silencer Select siRNA sequence will be synthesized free of charge. This guarantee does not extend to any replacement product.”

(b) Stealth: “Life Technologies guarantees that when you purchase three Stealth Pre-designed siRNA to the same target, then atleast two of those three independent, non-overlapping siRNAs will silence the target mRNA by 70% or more. To qualify for the guarantee, siRNA's must have been transfected at ≥20 nM and mRNA levels detected 48h post transfection. Real-Time RT-PCR is recommended but not required for this application. Customers must also show sufficient knockdown with a positive control siRNA to demonstrate transfection efficiency. If the guaranteed level of knockdown is not observed and an appropriate positive control is successful, a new Silencer siRNA sequence will be synthesized free of charge. This guarantee does not extend to any replacement product. We also recommend the use of an appropriate negative control, such as one of the three Stealth™ RNAi Negative Controls to normalize message knockdown.”

(c) Silencer: “Life Technologies guarantees that when you purchase three Silencer Pre−designed siRNAs to the same target, at least two of the siRNAs will reduce target mRNA levels in cultured cells by 70% or more when measured 48 hours after transfection at 100 nM or higher final siRNA concentration under the conditions described below. If atleast two of the three siRNAs do not induce >70% target mRNA knockdown, Life Technologies will provide a one−time replacement of up to three Silencer Pre−designed siRNAs per target at no additional charge. Requests for replacement product must be made within one hundred and eighty (180) days from the date of delivery of the Silencer Pre−designed siRNAs. Optimum transfection efficiency must be confirmed using good laboratory practices and a proven−to−work siRNA to an endogenous message, such as Ambion Silencer GAPDH siRNA Control. To assess knockdown, target mRNA levels in treated samples must be compared to that of cells transfected with a nontargeting control siRNA, such as Silencer Negative Control #1. We recommend Applied Biosystems TaqMan® Gene Expression Assays to quantify mRNA levels.

siRNA videos

Meet the inventor: Susan Magdaleno discusses Silencer® Select siRNA technology

Dr. Gavin Robertson describes how Silencer® Select siRNA technology is advancing melanoma research.

siRNA publications