QuantiTect Reverse Transcription Kit

快速合成cDNA，进行两步法real-time RT-PCR，用于基因表达分析

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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

€461.00

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Reactions

200

400

数量

QuantiTect Reverse Transcription Kit 旨在用于分子生物学应用。该产品不能用于疾病诊断、预防和治疗。

是否需要商用批量、定制或优化产品？我们还提供物流、合规等方面的支持。主动联系，与 QIAGEN 战略合作伙伴及 OEM 合作

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特点

cDNA合成和gDNA去除仅用20分钟完成
即便是低丰度的转录本也能获得高产量的cDNA
转录本的5'和3'端区域都可以进行cDNA合成
无需设计RNA特异性引物或探针

产品详情

QuantiTect Reverse Transcription Kit通过方便快速的操作过程进行cDNA合成，并有效去除基因组DNA。应用gDNA Wipeout Buffer可高效去除RNA样本中的基因组DNA污染。QuantiTect Reverse Transcription Kit提供所有快速、高效逆转录所需的组分，包括Quantiscript Reverse Transcriptase、Quantiscript RT Buffer和独特的RT Primer Mix。合成的cDNA经过优化可用于real-time PCR，实现对mRNA转录本所有区域的靶分子进行可靠的定量检测。

绩效

使用QuantiTect Reverse Transcription Kit，基因组DNA污染物可使用独特的gDNA Wipeout Buffer迅速有效的去除（参见" Effective genomic DNA removal for accurate real-time RT-PCR"）。去除基因组DNA对于准确的基因表达结果非常重要，而并不总是可以设计RNA特异性引物或探针。使用gDNA Wipeout Buffer可节省时间和费用，因为纯化RNA样品过程中或纯化后均无需另外采用DNase消化。

Quantiscript Reverse Transcriptase的高RNA亲和性配合Quantiscript RT Buffer可从各种RNA模板中获得高产量cDNA（见表“低丰度转录本可获得较高产量的cDNA”）。即使复杂的模板也能成功逆转录，如GC含量高或有复杂二级结构的模板。

低丰度转录本可获得较高产量的cDNA
	IL12A的C_T值（低表达）		IL1RN的C_T值（高表达）
Input RNA (ng)	QIAGEN	Supplier A_II	QIAGEN	Supplier A_II
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

RT Primer Mix包含有特别优化的oligo-dT和随机引物的混合物，使cDNA合成可从RNA转录本的各个区域起始，甚至可从5'区域开始（参见" Sensitive detection of a target at the 5' region of a 12.5 kb transcript"）。与其他供应商提供的试剂盒相比，QuantiTect Reverse Transcription Kit为real-time PCR分析提供高产量的cDNA，无需考虑待扩增目标序列位于转录本的哪个区域，检测低丰度的基因也具有更高灵敏度（参见" Higher sensitivity in real-time, two-step RT-PCR"）。同时，QuantiTect Reverse Transcription Kit也确保了real-time RT-PCR结果更好的重复性。

查看图表

Effective genomic DNA removal for accurate real-time RT-PCR.

Sensitive detection of a target at the 5' region of a 12.5 kb transcript.

Higher sensitivity in real-time, two-step RT-PCR.

原理

QuantiTect Reverse Transcriptase是Omniscript和Sensiscript Reverse Transcriptases的新型混合物，对RNA具有高亲和性，可从各种含量的RNA（10 pg到1 µg）合成cDNA。与其他供应商提供的试剂盒相比，QuantiTect Reverse Transcription Kit为real-time PCR分析提供高产量的cDNA，无需考虑待扩增目标序列位于转录本的哪个区域。即使复杂的模板也能成功逆转录，如GC含量高或有复杂二级结构的模板。QuantiTect RT Buffer已经过优化，可与real-time PCR缓冲液兼容。

为获得准确的real-time RT-PCR基因表达分析结果，很重要的是仅扩增和检测cDNA。基因组DNA的干扰可通过设计横跨外显子/外显子边界的引物或探针避免。尽管如此，在某些特殊情况下（如：cDNA来自一个单外显子基因），起始RNA样品必须无基因组DNA。使用QuantiTect Reverse Transcription Kit，基因组DNA污染物可使用独特的gDNA Wipeout Buffer迅速有效的去除。使用gDNA Wipeout Buffer可节省时间和费用，因为纯化RNA样品过程中或纯化后均无需另外采用DNase消化。另外，不需要设计RNA特异性引物或探针。

QuantiTect Reverse Transcriptase Kit的组份
组份	优势
gDNA Wipeout Buffer	在real-time RT-PCR时仅检测RNA
Quantiscript Reverse Transcriptase	适用的RNA起始量范围大（10 pg到1 µg RNA）灵敏度高
Quantiscript RT Buffer	处理复杂模板
RT Primer Mix	对转录本的各个区域，包括5'区进行cDNA合成

程序

使用QuantiTect Reverse Transcription Kit可在20分钟内去除基因组DNA和合成cDNA（参见" Fast and convenient cDNA synthesis"）。由于两个反应均在同一孵育温度并使用预混液构建反应，因此操作过程快速且方便。

QuantiTect Reverse Transcription Kit包括快速合成cDNA所需的所有组分。纯化的RNA只需简单地与gDNA Wipeout Buffer孵育，即可有效去除污染的基因组DNA。与其他的方法相比，使用Quantiscript Reverse Transcriptase、Quantiscript RT Buffer和RT Primer Mix制备的预混液可将RNA样品直接进行逆转录。使用Quantiscript Reverse Transcriptase，即使具有复杂的二级结构的RNA也可在低温下转录，确保RNA保持完整：整个反应都在42°C下完成，并在95°C失活。不需要RNA变性、引物退火和RNase H消化。

查看图表

Fast and convenient cDNA synthesis.

应用

QuantiTect Reverse Transcription Kit可从各种类型的起始样本中合成cDNA，以实现高效和高灵敏度的real-time RT-PCR。样本类型包括激光显微切割样本和活组织切片。

辅助数据和图表

Fast and convenient cDNA synthesis.

Genomic DNA removal and cDNA synthesis take only 20 minutes with the QuantiTect Reverse Transcription Kit. The procedure is fast and convenient since both reactions are run using the same incubation temperature and are set up using master mixes. In contrast, the procedure for the kit from Supplier I is much longer and requires more "hands-on time" due to additional pipetting steps and frequent changes in incubation temperature.

Specifications

Features	Specifications
Applications	Quantification of (even low-abundance) transcripts
Sample/target type	RNA template
Enzyme activity	Reverse transcription
Real-time or endpoint	Real time
Reaction type	Two-step, cDNA production, genomic DNA digestion
Single or multiplex	Single
Mastermix	No

资源

Download Safety Data Sheets for QIAGEN product components.

For cDNA synthesis with integrated removal of genomic DNA contamination For use in real-time two-step RT-PCR

FAQ

Ensure PCR amplicons are as short as possible, ideally 60–150 bp. Always use the same algorithm or software to design the primers and probes. For optimal results, only combine assays that have been designed using the same parameters.

Check the functionality of each set of primers and probes in individual assays before combining the different sets in the multiplex assay. Choose compatible reporters and quenchers based on a specific instrument. See How do I select appropriate reporter and quencher combinations for multiplex PCR.

FAQ ID -9093

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

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

No. UNG treatment does not provide any advantage for the QuantiFast and Rotor-Gene PCR kits because the mastermixes do not contain dUTP. Use the QuantiTect kits if you intend to use the UNG treatment.

FAQ ID -9092

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

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

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

If the extra peaks seem irregular or noisy, do not occur in all samples, and occur at temperatures less than 70 ºC, then these peaks may not represent real PCR products and instead may represent artifacts caused by instrument settings.

Usually extra peaks caused by secondary products are smooth and regular, occur reproducibly in most samples, and occur at temperatures greater than 70 ºC. Characterization of the product by agarose gel electrophoresis is the best way to distinguish between these cases. If only one band appears by agarose gel then the extra peaks in the dissociation curve are instrument artifacts and not real products. If this is the case, refer to the thermal cycler user manual, and confirm that all instrument settings (smooth factor, etc.) are set to their optimal values.

FAQ ID -90990

The REST 2009 (Relative Expression Software Tool) software applies mathematic models that compensate for the different PCR efficiencies of the gene of interest and reference genes. In addition, the software can use multiple reference gene normalization to improve the reliability of result, as well as provides statistical information suitable for robust comparison of expression in groups of treated and untreated. QIAGEN offers the REST 2009 software free of charge.

FAQ ID -9095

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

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

Check the template quality and integrity by amplifying an endogenous control gene. Check the amplicon by QIAxcel Advanced system or agarose gel electrophoresis to show that amplification was successful.

Determine whether the gene of interest is expressed in your sample. See How can I find out if my gene of interest is express in a specific tissue type or cell line. Ensure the assay setup and cycling conditions are correct, and that the data collection channel matches the emission wavelength of the fluorescent dye used. Use a control sample in which the gene of interest is definitely expressed.

If the issue persists, please send the original run file to QIAGEN Technical Services.

FAQ ID -9091

For duplex analysis, using non-fluorescent quenchers (e.g., Black Hole Quencher^®) is preferred over fluorescent quenchers (e.g., TAMRA fluorescent dye). For triplex and 4-plex analysis, QIAGEN strongly recommends using non-fluorescent quenchers. Generally, use the green channel, the yellow channel, and the orange and crimson channels to detect the least abundant target, the second least abundant target, and the two most abundant targets, respectively. For instrument-specific recommendations, please see the handbooks for the QuantiTect Multiplex PCR kit, QuantiFast Multiplex kit or Rotor-Gene Multiplex kit.

FAQ ID -9094

The gDNA wipeout buffer incubation step can be skipped when the total RNA is free from genomic DNA. However, the gDNA wipeout buffer is still required to be added because the reverse transcription step is optimized in the presence of components in the gDNA wipeout buffer.

FAQ ID -9098

Store the standards at a high concentration in aliquots at -20^oC to -70^oC. If using low concentrations, stabilize standards with carrier nucleic acid. It is always best to use freshly diluted standards for each experiment. If possible, use siliconized tubes for standard (and target) dilutions. This will prevent any unspecific binding of nucleic acids to the plastic.

FAQ ID -9099

Yes, reactions using the QuantiTect Reverse Transcription Kit can be scaled up. Please scale up all reaction components proportionally.

FAQ ID -1063

Reliable HRM analysis results depend on template quality, highly specific HRM PCR kit with a saturation dye, a real-time instrument with HRM capability, and powerful software package. Factors critical for successful HRM analysis are:

Use the same genomic DNA purification procedure for all samples being analyzed by HRM. This avoids variation due to differing composition of elution buffers.
DNA template concentrations should be normalized using the same dilution buffer. Ensure the C_T values are below 30 and differ no more than 3 C_T values across individual samples.
Design assays with amplicon length 70–350 bp. For SNP analysis, use amplicon length 70–150 bp.
Always start with 0.7 µM primer concentration

For more details, please refer to the HRM Technology – FAQs and the Critical Success Factor for HRM performance.

FAQ ID -9097

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

For two-step RT-PCR, the QuantiTect Reverse Transcription Kit and QuantiTect SYBR Green PCR Kit are recommended
For one-step RT-PCR, the QuantiTect SYBR Green RT-PCR Kit is recommended

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

FAQ ID -1143

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

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

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

Depending on primer design and copy number of target, primer-dimer may occur and its signal might be detected. Typical strategies against this are to optimize PCR conditions and/or redesign the assay.

Alternatively, an additional data-acquisition step can be added to the 3-step cycling protocol. First, determine the melting temperatures (T_m) for both the amplicon and the primer-dimer. Then, add a 15 second data-acquisition step with a temperature that is higher than the primer-dimer T_m, but approximately 3ºC lower than the specific amplicon T_m.

FAQ ID -9096