QuantiTect Reverse Transcription Kit

For fast cDNA synthesis enabling sensitive real-time two-step RT-PCR for gene expression analysis

Features

  • cDNA synthesis and gDNA removal in only 20 minutes
  • High cDNA yields even from low-abundance transcripts
  • cDNA synthesis from 5' and 3' regions of transcripts
  • No need to design RNA-specific primers or probes
QuantiTect Rev. Transcription Kit (50)

Cat. No. / ID: 205311

For 50 x 20 µl reactions: 100 µl 7x gDNA Wipeout Buffer, 50 µl Quantiscript Reverse Transcriptase, 200 µl 5x Quantiscript RT Buffer, 50 µl RT Primer Mix, 1.9 ml RNase-Free Water
$403.00
Reactions
50
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400
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The QuantiTect Reverse Transcription Kit is intended for molecular biology applications. This product is not intended for the diagnosis, prevention, or treatment of a disease.

Product Details

The unique QuantiTect Reverse Transcription Kit provides a fast and convenient procedure for cDNA synthesis with integrated genomic DNA removal. Genomic DNA contamination in RNA samples is effectively eliminated by gDNA Wipeout Buffer. All components that are required for fast and efficient reverse transcription are provided with the QuantiTect Reverse Transcription Kit, including Quantiscript Reverse Transcriptase, Quantiscript RT Buffer, and a unique RT Primer Mix. The synthesized cDNA is optimized for use in real-time PCR, allowing reliable quantification of targets from all regions of mRNA transcripts.

Performance

Using the QuantiTect Reverse Transcription Kit, contaminating genomic DNA in RNA samples is effectively and rapidly removed with the unique gDNA Wipeout Buffer (see figure  Effective genomic DNA removal for accurate real-time RT-PCR). Elimination of genomic DNA is crucial for accurate gene expression results, and design of RNA-specific primers or probes is not always possible. With gDNA Wipeout Buffer, time is saved and costs are reduced, since a separate DNase digestion is unnecessary, either during or after purification of RNA samples. 

The high RNA affinity of Quantiscript Reverse Transcriptase, in combination with Quantiscript RT Buffer, enables high yields of cDNA from any RNA template (see table “Higher cDNA yields for less abundant transcripts”). Even difficult templates, such as those with high GC-content or complex secondary structure, are successfully reverse transcribed.

Higher cDNA yields for less abundant transcripts
CT values for IL12A
(low expression)
CT values for IL1RN
(higher expression)
Input RNA (ng) QIAGEN Supplier AII QIAGEN Supplier AII
1000 30.9 32.0 23.1 24.9
100 34.2 35.4 26.3 26.6
10 37.8 46.8 29.7 30.3
1 N.D. N.D. 32.4 34.5
Real-time, two-step RT-PCR analysis of IL12A and IL1RN using different amounts of input RNA. Total RNA was reverse transcribed using the QuantiTect Reverse Transcription Kit or a kit from Supplier AII. The cDNA synthesized was analyzed on the ABI PRISM 7900 using the QuantiTect Probe PCR Kit and QuantiTect Gene Expression Assays for IL12A or IL1RN. CT values were lower with the QIAGEN kit, especially for the medium-abundance IL12A gene (bold), indicating higher cDNA yields. N.D.: Not detected.

The RT Primer Mix contains a specially optimized mix of oligo-dT and random primers that enable cDNA synthesis from all regions of RNA transcripts, even from 5' regions (see figure  Sensitive detection of a target at the 5' region of a 12.5 kb transcript). In contrast to kits from other suppliers, the QuantiTect Reverse Transcription Kit provides high yields of cDNA template for real-time PCR analysis regardless of where the amplified target region is located on the transcript, and provides greater sensitivity in the detection of low-abundance genes (see figure " Higher sensitivity in real-time, two-step RT-PCR"). The QuantiTect Reverse Transcription Kit also enables greater reproducibility in real-time RT-PCR.

See figures

Principle

QuantiTect Reverse Transcriptase is a novel blend of Omniscript and Sensiscript Reverse Transcriptases, which has a high affinity for RNA and is capable of cDNA synthesis from a wide range of RNA amounts (10 pg to 1 µg). In contrast to kits from other suppliers, the QuantiTect Reverse Transcription Kit provides high yields of cDNA template for real-time PCR analysis regardless of where the amplified target region is located on the transcript. Even difficult templates, such as those with high GC-content or complex secondary structure, are successfully reverse transcribed. QuantiTect RT Buffer has also been optimized to be compatible with real-time PCR buffer.

To obtain accurate results in real-time RT-PCR gene expression assays, it is important that only cDNA is amplified and detected. Interference by genomic DNA can be avoided by designing primers or probes that span an exon/exon boundary. However, in cases where this is not possible (e.g., the cDNA is from a single-exon gene), it is essential that the starting RNA sample is free of genomic DNA. Using the QuantiTect Reverse Transcription Kit, contaminating genomic DNA in RNA samples is effectively and rapidly removed with unique gDNA Wipeout Buffer. Time is saved and costs are reduced, since a separate DNase digestion not required, either during or after purification of RNA samples. Also, design of RNA-specific primers or probes is unnecessary. 

Components of the QuantiTect Reverse Transcriptase Kit
ComponentBenefits
gDNA Wipeout Buffer Detection of RNA only in real-time RT-PCR
Quantiscript Reverse Transcriptase Use of a wide range of RNA amounts (10 pg to 1 µg RNA)
High sensitivity
Quantiscript RT Buffer Read-through of difficult templates
RT Primer Mix cDNA synthesis from all regions of transcripts, even from 5' regions

Procedure

Genomic DNA removal and cDNA synthesis take only 20 minutes with the QuantiTect Reverse Transcription Kit (see flowchart " Fast and convenient cDNA synthesis"). The procedure is fast and convenient, since both reactions are run using the same incubation temperature and are set up using master mixes.

The QuantiTect Reverse Transcription Kit includes everything you need for fast cDNA synthesis. Purified RNA is briefly incubated in gDNA Wipeout Buffer to effectively remove contaminating genomic DNA. In contrast to other methods, the RNA sample is then used directly in reverse transcription, using a master mix prepared from Quantiscript Reverse Transcriptase, Quantiscript RT Buffer, and RT Primer Mix. With Quantiscript Reverse Transcriptase, RNA can be transcribed at low temperatures, even through complex 2° structure, ensuring that the RNA will stay intact — the entire reaction takes place at 42°C and is then inactivated at 95°C. Additional steps for RNA denaturation, primer annealing, and RNase H digestion are not necessary.

See figures

Applications

The QuantiTect Reverse Transcription Kit allows highly efficient and sensitive real-time RT-PCR for all types of starting material, including laser-microdissected samples and tissue biopsies.

Supporting data and figures

Specifications

FeaturesSpecifications
applicationsQuantification of (even low-abundance) transcripts
sampletargettypeRNA template
enzymeactivityReverse transcription
realtimeorendpointReal time
reactiontypeTwo-step, cDNA production, genomic DNA digestion
singleormultiplexSingle
mastermixNo

Resources

Quick-Start Protocols (1)
Kit Handbooks (1)
For cDNA synthesis with integrated removal of genomic DNA contamination For use in real-time two-step RT-PCR
Gene Expression Analysis (1)

FAQ

Is it possible to use the QuantiTect Reverse Transcription Kit with bacterial RNA?

Yes, it is possible to use the QuantiTect Reverse Transcription Kit for bacteria. The RT Primer Mix provided in the kit is a unique, optimized blend of random primers and oligo-dT allowing high cDNA yields from all regions of RNA transcripts. It has successfully been tested for Reverse Transcription in bacteria as well. We strongly recommend to isolate bacterial RNA using the RNeasy Mini Kit prior to performing Reverse Transcription. This will ensure the high prep quality necessary for optimal RT results with the QuantiTect Reverse Transcription Kit.

FAQ ID -785
Is mRNA isolation necessary for sensitive RT-PCR?
Usually not. Since RT-PCR is extremely sensitive, as little as 10–200 ng total RNA is sufficient for each 25–50 µl reaction mix, depending on the RT system. For abundant mRNA species, it is possible to use even less than 10 ng total RNA. For rare mRNA species, use a sequence-specific primer in the RT reaction to increase sensitivity. RNA content in various cells and tissues can be found here.
FAQ ID -111
Can the Reverse Transcriptases of the QuantiTect Reverse Transcription Kit and the QuantiTect Probe RT-PCR Kit be used interchangeably?

No, please do not exchange Quantiscript Reverse Transcriptase of the QuantiTect Reverse Transcription Kit with QuantiTect RT Mix of the QuantiTect Probe RT-PCR Kit.

Although both are an optimized mixture of Omniscript and Sensiscript Reverse Transcriptases, the mixture provided in the QuantiTect Reverse Transription Kit is optimized for random priming in a two-step reaction, whereas the mixture in the QuantiTect Probe RT-PCR Kit is optimized for gene-specific priming in a one-step RT-PCR reaction.

 

FAQ ID -1066
Can I use my gene-specific primers with the FastLane Cell cDNA Kit and the QuantiTect Reverse Transcription Kit?

Yes, you can substitute the RT Primer Mix supplied in the FastLane Cell cDNA Kit and the QuantiTect Reverse Transcription Kit with your gene-specific primers. We suggest optimizinig the primer concentration by titration, starting at 1 uM, and gradually decreasing it to 0.5 uM final concentration in the reaction. Optimal amounts will depend on the specific primers you are using.

FAQ ID -812
What is the recommended solution in which to store RNA samples that will be used as templates for cDNA synthesis?
For best results, all RNA samples should be suspended in RNase-free water. Alternatively, RNase-free 1 mM sodium citrate (pH 6.5) or 10 mM Tris buffer (pH 7.0) may be used. Do not use DEPC-treated water, as most DEPC preparations are contaminated with molecules that are inhibitory to reverse transcription and/or PCR. For long-term storage, RNA preps may be stored at -70 ºC in RNase-free water, or the buffers listed above, or precipitated in ethanol or isopropanol. In order to avoid repeated freeze-thaw cycles, it is recommended that frozen RNA samples be stored as multiple, single-use aliquots.
FAQ ID -2659
How do the FastLane Cell cDNA Kit and QuantiTect Reverse Transcription Kit eliminate genomic DNA contamination?
The FastLane Cell cDNA Kit and QuantiTect Reverse Transcription Kit contain a unique buffer, called gDNA Wipeout Buffer, which ensures complete removal of gDNA after a brief incubation step.
FAQ ID -783
What is the threshold cycle or Ct value?
The Ct or threshold cycle value is the cycle number at which the fluorescence generated within a reaction crosses the fluorescence threshold, a fluorescent signal significantly above the background fluorescence. At the threshold cycle, a detectable amount of amplicon product has been generated during the early exponential phase of the reaction. The threshold cycle is inversely proportional to the original relative expression level of the gene of interest.
FAQ ID -2682
Is it possible to scale up QuantiTect Reverse Transcription reactions to allow use of larger amounts of RNA?
Yes, reactions using the QuantiTect Reverse Transcription Kit can be scaled up. Please scale up all reaction components proportionally.
FAQ ID -1063
Do QuantiTect Primer Assays contain SYBR Green dye?

No, QuantiTect Primer Assays are supplied as lyophilized, premixed primer pairs. Reaction components for SYBR Green real-time RT-PCR must be purchased separately.

To find a QuantiTect Primer Assay for your target gene of interest, please visit our GeneGlobe data base.

FAQ ID -1143
Why should DNA or cDNA targets be less than 250 bp long for real-time PCR?

Shorter amplification products facilitate high PCR efficiencies. Ideally, amplicon length should be less than 150 bp for optimal amplification efficiency. PCR efficiencies close to 100% are a crucial prerequisite for accurate quantification of target copy numbers in real-time PCR.

FAQ ID-751
What are the recommended storage conditions for the QuantiTect Reverse Transcription Kit and its components?

The QuantiTect Reverse Transription Kit should be stored at -20°C immediately upon receipt. We recommend to aliquot the RT Primer Mix and keep it at -20°C.

If the kit is being used routinely, it may be convenient to prepare a premix of RT Primer Mix and 5x Quantiscript RT Buffer at a ratio of 1:4. Aliquot the premix and store at -20°C.

FAQ ID -1077
Can T-Script® enzyme of the QuantiTect Whole Transcriptome Kit be substituted by Quantiscript Reverse Transcriptase?

No, the T-Script® enzyme of the QuantiTect Whole Transcriptome Kit is an optimized blend for whole transcriptome amplification and cannot be substituted by Quantiscript Reverse Transcriptase of the QuantiTect Reverse Transcription Kit, or any other reverse-transcription enzyme.

 

FAQ ID -1617