TaqMan™, GTXpress™ TaqMan™ GTXpress™ Master Mix

Product Code.	Quantity	unitSize
10239234	10 mL	10mL
10635975	1 mL	Each
10625975	50 mL	20000 reactions
10605805	2 x 50 mL	40000 reactions

Product Code. 10239234 Supplier TaqMan™, GTXpress™ Supplier No. 4401892

Description

Includes

Contains 2 x 50mL TaqMan™ GTXpress™ Master Mix (2X master mix containing AmpliTaq™ Fast DNA Polymerase, UP, dNTPs, Tracking Dye and ROX™ Dye).

Combines AmpliTaq™ Fast DNA Polymerase, UP, dNTPs, Tracking Dye, and ROX™ dye in a convenient single vial format.

TaqMan™ GTXpress™ Master Mix delivers accurate genotyping results with robust performance in less than 50 min. The 100mL pack (2 x 50mL) includes reagents sufficient to perform 40,000 PCR reactions (5μL/reaction).

• Compatible with both Fast and Standard mode thermal cycling conditions
• Pre-mixed components stored at 2° to 8°C significantly reduce assay setup time
• Validated with all types of Applied Biosystems™ TaqMan™ Genotyping Assays
• Extended PCR cycling can be used for poorly amplified or sample-limited reactions The TaqMan™ GTXpress™ Master Mix is also sold as part of TaqMan™ Sample-to-SNP™ Kit, which provides real-time PCR-ready DNA in 5 min. from a wide variety of samples, ranging from blood to buccal swabs to plant tissues. For more information on the TaqMan™ Sample-to-SNP™ Kit, refer to the Applied Biosystems™ TaqMan™ Sample-to-SNP™ Kit Protocol.

Order Info

Guaranteed minimum shelf life is 60 days.

Specifications

• Concentration: 2X
• Content And Storage: Contains 1 x 10 mL TaqMan™ GTXpress™ Master Mix (2X mix of AmpliTaq™ Fast DNA Polymerase, UP, dNTPs, Tracking Dye and ROX™ Dye). Sufficient for 4,000 reactions. Store at 2-8°C.
  
  Guaranteed minimum shelf life is 60 days (exact expiry date printed on product and CofA).
• Detection Method: Primer-probe
• Format: Single Vial
• GC-Rich PCR Performance: High
• PCR Method: qPCR
• Polymerase: AmpliTaq DNA Polymerase
• Reaction Speed: Fast or Standard
• Technique: SNP Genotyping (Real-Time PCR-Based)
• For Use With (Equipment): QuantStudio™ 12k Flex, QuantStudio™ 3, QuantStudio™ 5, QuantStudio™ 6 Flex, QuantStudio™ 7, StepOne™ Standard Mode, StepOne™ Fast Mode
• Genotyping Target: SNPs (Unknown or Numerous), SNPs (Known)
• Passive Reference Dye: ROX (Pre-mixed)
• Product Line: GTXpress, TaqMan
• Product Type: Master Mix
• Purity or Quality Grade: UP (Ultra Pure)
• Quantity: 10 mL
• Shipping Condition: Wet Ice
• For Use With (Application): Genotyping
• Fidelity (vs. Taq): 2 X
• Hot Start: Built-In Hot Start
• No. of Reactions: 40,000 Reactions
• Sample Type: DNA (Genomic), Sample-to-SNP™ Kit Lysates
• Volume: 100 mL

Frequently Asked Questions (FAQs)

What master mix can I use with the TaqMan SNP Genotyping Assays?

We recommend using either the TaqPath ProAmp Master Mix or the TaqMan Genotyping Master Mix. The TaqMan Genotyping Master Mix has the advantage of proven performance with up to 3 days of pre- and post-PCR stability, allowing you to set up plates ahead of time or read the plates later (see the data here, https://tools.thermofisher.com/content/sfs/brochures/cms_039236.pdf) while the TaqPath ProAmp Master Mix can handle samples that may have inhibitors present.

What can I do to improve the sensitivity of my qPCR assay?

If you are targeting a low-abundance gene, you may have trouble getting Ct values in a good, reliable range (Ct > 32). To increase the sensitivity of the assay, you may want to consider the following:

- Increase the amount of RNA input into your reverse transcription reaction, if possible
- Increase the amount of cDNA in your qPCR reaction (20% by volume max)
- Try a different reverse transcription kit, such as our SuperScript VILO Master Mix, for the highest cDNA yield possible
- Consider trying a one-step or Cells-to-CT type workflow (depending on your sample type)

How do I set the baseline for my qPCR experiment?

Most times your instrument software can automatically set a proper baseline for your data. Check out our short video, Understanding Baselines, for more information on how to set them (https://www.youtube.com/watch?feature=player_embedded&v=5BjFAJHW-bE).

How do I set the threshold for my qPCR experiment?

In most cases your instrument software can automatically set a proper threshold for your data. Check out our short video, Understanding Thresholds, for more information on how to set them (https://www.youtube.com/watch?feature=player_embedded&v=H_xsuRQIM9M).

I am not getting any amplification with my TaqMan Assay or SYBR Green primer set. What is causing this?

There could be several reasons for no amplification from an assay or primer set. Please see these examples and suggested solutions in our Real-Time Troubleshooting Tool (https://www.thermofisher.com/us/en/home/life-science/pcr/real-time-pcr/qpcr-education/real-time-pcr-troubleshooting-tool/gene-expression-quantitation-troubleshooting/no-amplification.html) for more details.

I am getting amplification in my no-template control (NTC) wells in my qPCR experiment. What is causing this?

There could be several reasons for amplification in a NTC well. Please see these examples and suggested solutions in our Real-Time Troubleshooting Tool (https://www.thermofisher.com/us/en/home/life-science/pcr/real-time-pcr/qpcr-education/real-time-pcr-troubleshooting-tool/gene-expression-quantitation-troubleshooting/amplification-no-template-control.html) for more details.

My amplification curves have a funny shape in my qPCR experiment. What is causing this?

There are several reasons that amplification could be delayed. Please see the information in our Real-Time Troubleshooting Tool (https://www.thermofisher.com/us/en/home/life-science/pcr/real-time-pcr/qpcr-education/real-time-pcr-troubleshooting-tool/gene-expression-quantitation-troubleshooting/abnormal-amplification-curves/amplification-occurs-later.html) for more details.

What can I do if the amplification of my target gene is later than expected for my qPCR experiment?

There are several reasons that amplification could be delayed. Please see the information in our Real-Time Troubleshooting Tool for more details (https://www.thermofisher.com/us/en/home/life-science/pcr/real-time-pcr/qpcr-education/real-time-pcr-troubleshooting-tool/gene-expression-quantitation-troubleshooting/abnormal-amplification-curves/amplification-occurs-later.html).

Can I use my SYBR Green primers for a TaqMan assay?

It may be possible to use your SYBR Green primers for a TaqMan assay, depending on how they were designed. You would have to design a separate probe to use with your existing primers. Please refer to the guidelines in this manual (https://tools.thermofisher.com/content/sfs/manuals/cms_041902.pdf) on “Manually Designing Primers and Probes” for the next steps. If you have Primer Express Software, you can use that software to design a probe. Please note that restricting the design using the predesigned SYBR primers may not allow for a successful probe design.

Do I have to normalize my samples for comparative Ct experiments?

Comparative Ct experiments use an endogenous control gene to normalize the cDNA input. Please watch this short video (https://www.youtube.com/watch?feature=player_embedded&v=jst-3hD_xFQ) for more details on how this works. For a protocol workflow, please refer to our Guide to Performing Relative Quantitation of Gene Expression (https://tools.thermofisher.com/content/sfs/manuals/cms_042380.pdf).

What are the requirements for a relative quantification qPCR experiment?

In a relative quantification experiment, you will need to identify an endogenous control and a reference (or calibrator) sample. An endogenous control is a gene that does not change in expression across all the samples in your study. A reference sample is the sample that you are comparing all others to. This is often the untreated, or control, sample. Please see our Relative Gene Expression Workflow bulletin (https://tools.thermofisher.com/content/sfs/brochures/cms_075428.pdf) for more step-by-step guidelines on how to design your experiment.

What are the requirements for a standard curve qPCR experiment?

In a standard curve experiment, you must generate a standard curve for each target gene. The standards should closely represent the sample (i.e., RNA for RNA input, plasmid or gDNA for DNA input). This reference (http://www.ncbi.nlm.nih.gov/pubmed/11013345) is a good review of standard curves and the experimental setup. You can also review this short video (https://www.youtube.com/watch?v=mE5ieko9_RQ) on standard curve experiments.

What is the difference between absolute quantification (AQ) and relative quantification (RQ)? How do I choose which method to use?

Absolute quantification will quantitate unknowns based on a known quantity. It involves the creation of a standard curve from a target of known quantity (i.e., copy number). Unknowns can then be compared to the standard curve and a value can be extrapolated. Absolute quantification is useful for quantitating copy number of a certain target in DNA or RNA samples. The result usually is a number followed by a unit, such as copy number and ng, etc.

Relative quantification can quantitate a fold difference between samples. It involves the comparison of one sample to another sample (calibrator) of significance. For example, in a drug treatment study you could compare a treated to an untreated sample. The quantity of the calibrator is not known and cannot be measured absolutely. Therefore the calibrator (untreated sample) and samples (treated samples) are normalized to an endogenous control (a gene that is consistently expressed among the samples) and then compared to each other to get a fold difference. Relative quantification is useful for quantitating messenger RNA levels. Since the result is a fold change or ratio, it is not followed by a unit.

The method that you choose will depend on the type of data you need from your experiment. You can find more information here (https://www.thermofisher.com/us/en/home/life-science/pcr/real-time-pcr/qpcr-education/absolute-vs-relative-quantification-for-qpcr.html) as well.

Can I do a melt curve with a TaqMan assay?

No. A TaqMan probe, once cleaved, cannot be re-quenched. Therefore a melt curve does not apply when using a TaqMan assay.

What is the difference between TaqMan and SYBR Green methods of detection?

TaqMan and SYBR Green chemistries are two different methods of detection for qPCR. Please see this detailed comparison of these two approaches (https://www.thermofisher.com/us/en/home/life-science/pcr/real-time-pcr/qpcr-education/taqman-assays-vs-sybr-green-dye-for-qpcr.html). You can also watch this short video (https://www.youtube.com/watch?feature=player_embedded&v=fkUDu042xic) on how TaqMan assays work.

How many replicates do I need to run for my qPCR experiment? What recommendations do you have for plate setup?

Please view this short video (https://www.youtube.com/watch?v=eIaPGhOjBQo), which explains some best practices for replicates and plate setup.

What are the different phases of a qPCR reaction?

Check out this short video (https://www.youtube.com/watch?feature=player_embedded&v=4sXPUbIrh3A) to understand the different phases of the PCR reaction and why they are important.

I'm trying to decide between purchasing a one-step or two-step RT-PCR kit. Can you review the advantages and disadvantages of each?

One-step RT-PCR is convenient and less prone to contamination, as there is less opportunity for pipetting error. This method is also faster than the two-step process. However, the cDNA cannot be archived, and fewer genes can be analyzed. Two-step RT-PCR gives you the ability to archive cDNA, analyze multiple genes, and offers greater flexibility. Learn more about the difference between one-step and two-step RT-PCR on this page Onestep vs Twostep RT-PCR.

I would like to order a TaqMan SNP Genotyping Assay. Does the kit include everything I need to perform my experiment or do I need to purchase reagents separately?

Each predesigned TaqMan SNP Genotyping Assay is delivered in a single tube consisting of two differentially labeled allele-specific TaqMan MGB (minor groove binding) probes and a pair of PCR primers. For more information, please see the following link: https://www.thermofisher.com/us/en/home/life-science/pcr/real-time-pcr/real-time-pcr-applications/genetic-variation-analysis-using-real-time/snp-genotyping-with-real-time-pcr.html

Besides the TaqMan SNP Genotyping Assay, you would need to purchase a Genotyping Master Mix and nuclease-free water. A list of compatible master mixes can be found in the following link: https://assets.thermofisher.com/TFS-Assets/LSG/manuals/MAN0009593_TaqManSNP_UG.pdf.

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