KAPA SYBR FAST One-Step qRT-PCR Kits

One Evolved Polymerase. One Step. One Tube.

KAPA SYBR FAST One-Step qRT-PCR Kits are designed for optimal performance in stringent qRT-PCR reaction conditions, exhibiting dramatic improvements in sensitivity, specificity, reaction efficiency, and fluorescence.  The kit is optimized for rapid one-step, one-tube RNA quantification, reducing experimental variation and contamination with a convenient qRT-PCR protocol.

KAPA SYBR FAST One-Step qRT-PCR Kits contain M-MuLV reverse transcriptase, RNase inhibitor, and a novel DNA polymerase evolved via directed evolution.

For Research Use Only. Not for use in diagnostic procedures.

Product Highlights

Increase signal and reaction efficiency

  • Consistently higher amplification efficiencies for accurate qPCR
  • Higher fluorescence, earlier Cq  values and improved reaction efficiencies

Amplify across a broad range of target lengths

  • Robust performance independent of amplicon size
279 bp fragment amplified in replicates of 6 from a 10-fold dilution series of commercial MS2 bacteriophage RNA (80 pg to 0.8 fg per 20 µL reaction). Reaction efficiency of 95% calculated for all 6 replicates per data. Data on file.

Improve sensitivity and reproducibility

  • Accurate interrogation across a wide range of RNA template concentrations
Applications
  • Gene expression analysis
  • Low-copy gene detection
  • Microarray validation
  • miRNA research
  • Gene knockdown validation
Kit Specifications and Contents / Storage

Kits can be stored for up to 6 months at -20˚C.

Kits include KAPA RT Mix, dUTP, and KAPA SYBR FAST qPCR Master Mix, which contains KAPA SYBR FAST DNA Polymerase, reaction buffer, dNTPs, SYBR Green I dye, and MgCl2 at a final concentration of 2.5 mM. Where noted, Master Mixes contain instrument-specific reference dyes, while the Universal kit includes 50X ROX High and 50X ROX Low separately.

Please reference the Instrument Compatibility Chart for guidance on compatible platforms.

Components

SYBR-OneStep_Component Chart

Specifications

Spec
Description
Starting Material
RNA
Input Amount
1 pg–1 µg total RNA 10 fg–100 ng poly(A) RNA 10-1 x 108 copies viral RNA
FAQs
What is the difference between a one-step and a two-step qRT-PCR reaction?

In a one-step qRT-PCR reaction, reverse transcription and quantitative PCR are performed as a single, closed tube assay, reducing the risk of contamination. Fewer pipetting steps and ease-of-use make one-step qRT-PCR ideal for routine, high-throughput screening. In two-step qRT-PCR reactions, reverse transcription and quantitative PCR are performed as separate reactions in separate tubes. Two-step qRT-PCR provides more flexibility since cDNA can be archived and used for additional real-time PCR reactions, eliminating the need to continually isolate RNA. However this flexibility comes with an increased risk of contamination and prolonged set up time.

What is the enzyme in KAPA SYBR qPCR Master Mix (2X)?

KAPA SYBR DNA Polymerase is an engineered variant of Taq DNA polymerase. It was specifically engineered for use in SYBR Green- based qPCR through a process of molecular evolution. KAPA SYBR DNA Polymerase is less inhibited by SYBR Green I dye and is more processive than wild-type Taq DNA Polymerase, resulting in increased sensitivity, fluorescence and speed. The enzyme has an integrated antibody-mediated hot start to remain inactive during reaction set-up, minimizing the formation of non-specific products.

What type of reverse transcriptase is present in the 50X KAPA RT Mix?

The 50X KAPA RT Mix contains wild-type M-MuLV Reverse Transcriptase that allows cDNA synthesis to occur at low temperatures. In addition, an RNase inhibitor is included in this enzyme mix to prevent RNA degradation due to RNase contamination.

What species are compatible with the kit?

KAPA SYBR FAST One-Step qRT-PCR Kits can be used with most RNA as template, (e.g., human, mouse, rat and bacteria.)

How much RNA should be used per reaction?

Suggested input quantities for KAPA SYBR FAST One-Step qRT-PCR assays:

  • 1 pg-1 µg total RNA
  • 10 fg-100 ng poly A(+) RNA
  • 10-1 x 108 copies viral RNA

What testing should be performed in order to assess the quality of an RNA sample?

All isolated RNA can be assessed electrophoretically on a denaturing 2% agarose gel containing ethidum bromide. The gel should contain sharp 28S and 18S rRNA bands with no smearing at their low molecular weight edge. If utilizing the Agilent BioAnalyzer, the RNA Integrity Number (RIN) should be above 5.0.

When would I add ROX passive reference dye to my qPCR reaction?

For certain real-time cyclers, the presence of ROX reference dye in real-time PCR compensates for non-PCR-related variations in fluorescence detection. Fluorescence from ROX reference dye does not change during the course of real-time PCR, but provides a stable baseline to which PCR-related fluorescent signals are normalized. Thus, ROX dye compensates for differences in fluorescence detection between wells due to slight variations in reaction volume or to differences in well position. The use of ROX dye is necessary for all instruments from Applied Biosystems and is optional for the Mx3000P®, Mx3005P™, and Mx4000®. Instruments from Bio-Rad/MJ Research, Cepheid, Corbett Research, Eppendorf, and Roche do not require ROX dye. The presence of ROX dye in the master mix does not interfere with real-time PCR on any instrument, since the dye is not involved in the reaction and has an emission spectrum different from that of SYBR Green I.

Why is dUTP supplied with the One-step qRT-PCR Kit?

dUTPs are supplied in a separate tube to offer optional treatment with Uracil-DNA glycosylase (UDG) for the prevention of carry-over contamination in subsequent reactions. UDG is not supplied in KAPA SYBR FAST qRT-PCR Kits.

Can I perform UDG decontamination when performing one-step qRT-PCR?

It is not recommended to use UDG when performing reverse transcription. When using a dNTP mix with dUTP in a reverse transcription reaction, uracil will be incorporated into the cDNA generated from the RNA template. The UDG will cleave the DNA containing dUTP residues and result in inefficient or no amplification.

Can reactions be set up at room temperature?

No. The reactions must be set up on ice. The 50X KAPA RT Mix is not thermostable; hence all reaction components must be kept cold during set up.

Can the temperature of the cDNA synthesis step be adjusted?

Optimal cDNA synthesis using wild-type M-MuLV RT occurs at 42ºC, however in cases of difficult templates, temperature adjustment between 42ºC–50ºC can be performed.

What type of priming method can I use with the KAPA SYBR FAST One-Step qRT-PCR Kit?

Only gene-specific primers can be used in a One-Step qRT-PCR system.

Will inactivated DNase affect the quality of the qPCR result?

Yes, any residual DNase activity has the potential to degrade cDNA product and thereby reduce the amount of template available for qPCR amplification. DNase will not be active during PCR cycling, however, it could degrade primers prior to the cycling process

How do I eliminate primer dimer in the no template control (NTC)?

The reasons for primer dimer formation in a NTC are often due to multiple factors. These include: sub-optimal primer annealing temperature (often due to differences in buffering conditions between different qPCR kits), sub-optimal primer synthesis (HPLC purified primers result in less primer dimer formation and are useful for low copy number detection), and poor primer design (using software such as Primer3 is recommended in primer design).

Reducing the total number of cycles in a qPCR reaction is an alternative method if amplification of the primer dimer lies outside of the range of the experimental data. For example, if the sample being interrogated has a Cg of 28 cycles, contains specific product only (no primer dimer), and the NTC amplifies a primer dimer after 37 cycles, the reaction can be run for 35 cycles, rather than 40. This approach can be taken only when the sample being tested gives rise to specific product and not a combination of specific product and primer dimer.

What are the storage recommendations for the KAPA SYBR FAST One-Step qRT-PCR Kit?

All kit components should be stored at -20ºC. Extra care should be taken when handling the 50X KAPA RT Mix. The RT Mix should always be stored at -20ºC as the enzymes are not thermostable. The KAPA SYBR FAST qPCR Master Mix is sensitive to light and should be protected from direct light particularly during storage. Care should be taken to avoid freeze-thaw cycles. When stored under these conditions and handled correctly, full activity of the kit is retained as indicated on the kit label.

Ordering

Kits include KAPA RT Mix, dUTP, and KAPA SYBR FAST qPCR Master Mix, which contains KAPA SYBR FAST DNA Polymerase, reaction buffer, dNTPs, SYBR Green I dye, and MgCl2 at a final concentration of 2.5 mM. Where noted, Master Mixes contain instrument-specific reference dyes, while the Universal kit includes 50X ROX High and 50X ROX Low separately.

Kit Code
Roche Cat. No
Description
Kit Size
How to buy
KK4650
07959613001
100 x 20 µL reactions (Universal)
1 mL
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KK4651
07959621001
500 x 20 µL reactions (Universal)
5 mL
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KK4652
07959630001
1000 x 20 µL reactions (Universal)
10 mL
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KK4660
07959656001
100 x 20 µL reactions, ROX (ABI Prism®)
1 mL
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KK4661
07959664001
500 x 20 µL reactions, ROX (ABI Prism)
5 mL
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KK4662
07959672001
1000 x 20 µL reactions, ROX (ABI Prism)
10 mL
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KK4670
07959702001
100 x 20 µL reactions, with fluorescein (Bio-Rad® iCycler™)
1 mL
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KK4671
07959729001
500 x 20 µL reactions, with fluorescein (Bio-Rad iCycler)
5 mL
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KK4672
07959737001
1000 x 20 µL reactions, with fluorescein (Bio-Rad iCycler)
10 mL
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KK4680
07959753001
100 x 20 µL reactions (optimized for use with Roche® LightCycler 480)
1 mL
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KK4681
07959761001
500 x 20 µL reactions (optimized for use with Roche LightCycler 480)
5 mL
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for pricing