StableScript™ One-Step RT-qPCR Mix

• Able to multiplex while maintaining sensitivity and specificity
• Formulated using StableScript™ Reverse Transcriptase with Improved thermostability, processivity and inhibitor resistance
• Detects as little as 0.1pg of RNA in 4 plex assay
• Excellent Lot-to-Lot consistency

The StableScript™ One-Step RT-qPCR Mix is a highly efficient and sensitive RT-qPCR formulation for DNA and RNA detection using 
hydrolysis probes. The 10X enzyme mix contains a blend of a new RNAse H minus reverse transcriptase with higher 
thermostability and inhibitor resistance (StableScript™), a fast-activating hot start DNA polymerase (Phoenix™), and specific 
enhancers to increase sensitivity and inhibitor resistance. 

StableScript™ One-Step RT-qPCR Mix is supplied with 4X StableScript™ Reaction Buffer B7720L, containing dNTPs and 
Magnesium.

StableScript™ One-Step RT-qPCR Mix is a blend of StableScript™ Reverse Transcriptase and Phoenix™ Hot Start Taq DNA 
Polymerase enzymes. StableScript™ Reverse Transcriptase is engineered for increased thermostability. Increasing the temperature 
for cDNA synthesis can aid in overcoming challenging RNA targets because higher temperatures help unravel RNA structures, 
reducing the likelihood of hindering reverse transcription.

The Phoenix™ Polymerase is a recombinant, thermostable Taq DNA polymerase complexed with a thermolabile, neutralizing 
antibody. This fast-activating antibody-mediated hot-start capability enhances the overall specificity, sensitivity, and yield of the PCR 
reaction by reducing nonspecific amplification and primer-dimer formation prior to cycling. Together with StableScript™, Phoenix™ 
creates StableScript™ One-Step RT-qPCR Mix, an extremely sensitive RT-qPCR mix:

• qPCR formulation for detection using hydrolysis probes
• Robust inhibitor resistance
• Able to multiplex while maintaining sensitivity and specificity
• Detects as little as 0.1pg of RNA in 4 plex assay
• Increased thermostability with optimal cDNA synthesis from 50ºC to 65ºC 
• Stable on benchtop overnight
• Excellent dynamic range on a variety of assay systems
• Exceptional lot-to-lot consistency

Mix properties

• Storage temperature: –25°C to –15°C

StableScript™ One Step RT-qPCR reaction setup

General precautions against degradation of RNA template should be taken when setting up a reaction, including setting up the 
reaction with nuclease free water, RNase inhibitor, nuclease free PCR tubes and sterile pipette tips with filter, adding reverse 
transcriptase last, gentle pipetting, thorough mixing and a quick centrifugation. The following procedure can be used as a 
guideline. Reactions may need to be optimized individually.

1. The 4X StableScript™ Reaction Buffer should be thaw completely and vortex for 3-5 seconds to mix thoroughly. Quickly 
   spin to collect contents.
2. Prepare the primer/probe mix. A final concentration of 0.4-0.9μM for each primer and 0.1-0.5μM for the probe is
   recommended. However, the optimal concentration for primers/probes needs to be empirically determined for each assay.
3. Determine the number of reactions to prepare, including No Template Controls (NTCs). Add 10% extra volume to 
   compensate for the pipetting loss.
4. Follow the table below to set up the reaction mix. It is recommended to make a master mix to minimize variations and 
   potential errors.

   Components	Volume/Rxn	Final Concentration
   4X StableScript™ Reaction Buffer	5μL	1X
   Primer/Probe Mix	XμL	Variable
   10X StableScript™ Enzyme Mix	2μL	1X
   RNA Template	Up to 2μL	1pg to 1µg total RNA
   Nuclease-Free Water	To a final 20μL reaction volume	-
5. Seal the PCR plate and spin briefly to collect contents at the bottom.

     Thermal Cycling Conditions: 

     Program the cycling conditions are recommended as below. 

*Cycling parameters can be modified (especially the annealing/extension condition) to fit specific assays. 

Quality control analysis

The functionality of the RT-PCR Assay is evaluated by amplification of three mRNA transcripts in a one-step RT-qPCR assay. The 
amplification threshold (Ct) of the test lot is compared to a reference lot.

Notes: 

Enzyme components were tested prior to formulation of the master mix and found free of contaminating endonucleases and 
exonucleases. Enzyme purity was >99% as determined by SDS-PAGE, and negligible E. coli genomic DNA contamination was 
confirmed by qPCR. Specific activity was verified for each enzyme pre-formulation.

This product is available for molecular biology applications such as:

• One-step RT-qPCR.
• Gene expression analysis of RNA targets
• DNA and RNA detection and quantification