qScript™ cDNA SuperMix

qScript cDNA SuperMix is a sensitive and easy-to-use 1-tube reagent for first-strand cDNA synthesis that combines a highly-modified RNAse H+ mutant of M-MLV together with ribonuclease inhibitor protein (RIP) in a rigorously optimized formulation for real-time qPCR applications. The stabilized SuperMix formulation has been rigorously optimized to deliver sensitive, linear assay performance across a spectrum of relative abundance and input RNA (10pg – 1ug). qScript cDNA SuperMix reagent performance is unaffected by repetitive freeze/thaw cycling (>20X), conferring greater ease-of-use and consistent assay performance. Oligo (dT) and random primers are pre-blended in a precise ratio to provide equal representation of 5′ and 3′-sequences for accurate gene expression quantification. For gene-specific priming (GSP) or two-step RT-PCR of RNA exceeding 1kb total length, see our qScript Flex cDNA Kit.

  • Stabilized 5X concentrated master mix minimizes pipetting to significantly improve assay accuracy.
  • Sensitive first-strand cDNA synthesis of RNA sequences ≤1kb for quantitative and conventional two-step RT-PCR.
  • Broad linear dynamic detection range with limiting (10pg) or plentiful (4ug) samples of total RNA.
  • Pre-blended with ribonuclease inhibitor protein (RIP) to prevent RNA template degradation during incubation and a proprietary blend of random and oligo(dT) primers, optimized to deliver unbiased representation of 5’ and 3’ sequences.


Performance Data

 qRT-PCR Dynamic Range

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Linearity – ACTB
qScript cDNA Supermix was used for first-strand cDNA synthesis using log-fold serial dilutions of HeLa cell total RNA from 1 µg to 1 pg. Eight replicate cDNA reactions were performed for each input quantity of RNA. 1/10th of each first-strand reaction was used for qPCR of the ACTB gene using PerfeCTa™ SYBR Green SuperMix.


High Sensitivity, Low Copy mRNA

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Higher Yield (more accurate representation) of low abundance gene with qScript – PP2A
First-strand synthesis was carried out using 1 µg HeLa cell total RNA with either qScript cDNA SuperMix or SuperScript® III First-Strand Synthesis System for RT-PCR. 5 ng total RNA equivalent (1/200th of each cDNA reaction) was used for SYBR Green qPCR of PP2A gene with PerfeCTa™ SYBR Green SuperMix. Inset: Dissociation (melt curve) analysis of SYBR Green qRT-PCR products shows amplification of correct amplicon in qScript reactions. Lower cDNA yield from SuperScript III reactions results in amplification of non-specific product.


High Sensitivity qRT-PCR

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Sensitivity – TRRAP comparison to SuperScript III SuperMix First Strand SuperMix for qPCR & QuantiTect Reverse Transcription Kit
First-strand cDNAs were synthesized following each manufacturers protocol with 1 µ or 1 ng of HeLa cell total RNA as template. 1/10th of first-strand reactions were used for qRT-PCR of 5′-end region of TRRAP gene with PerfeCTa™ SYBR Green SuperMix. Averaged plots from 4 replicate qPCR reactions are shown.



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Reproducibility – CDKN1B
qScript cDNA SuperMix was used for 48 independent first-strand reactions containing 100 ng or 100 pg of HeLa cell total RNA template. 1/10th of each first-strand reaction was used for TaqMan® qPCR of CDKN1B using PerfeCTa™ qPCR SuperMix.


Protocol Comparison

protocol comparison
Easy-to-use cDNA SuperMix format

Features & Benefits

  • Easy-to-use, one-tube format (or 96 well)
  • High sensitivity across a broad range of RNA template concentrations
  • Ideal for high-throughput applications
  • Ideal for dilute and low-copy samples – 5X reaction mix maximizes RNA input volume
  • Unbiased cDNA synthesis – complete 5′ to 3′ RNA sequence representation


  • Single-tube, 5X concentrated reagent containing:
    • Reaction buffer with optimized concentrations of molecular-grade MgCl2, dATP, dCTP, dGTP, dTTP
    • Recombinant ribonuclease inhibitor protein (RIP)
    • qScript reverse transcriptase
    • Titrated concentrations of random hexamer and oligo(dT) primer
    • Proprietary enzyme stabilizers and performance-enhancing additives

Storage conditions

qScript cDNA SuperMix is stable for up to 1 year when stored in a constant temperature freezer at -20°C. The kit may be stored at -80°C to further extend the product’s shelf life. SuperMix reagent shows no loss in functional performance after 20 cycles of freezing on dry ice and thawing on ice.

Thaw completely on ice then pulse vortex to mix and briefly spin-down to collect contents before opening tube. 5X concentrated reagent is viscous. Do not immerse pipet tip below liquid surface when drawing out material.



Cat# 95048-025 25 rxns
Cat# 95048-100 100 rxns
Cat# 95048-500 500 rxns