Lyo-Ready™ 1-Step RT-qPCR Virus Master Mix
Lyo-Ready™ 1-Step RT-qPCR Virus Mix is a glycerol-free mix, ideal for developing ambient temperature, lyophilized, multiplex qPCR and RT-qPCR molecular diagnostic tests, particularly for RNA viruses, and is suited for high-throughput, automated platforms or microfluidic qPCR platforms requiring millisecond rehydration times.
Can also be used wet
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High efficiency and sensitivity from both DNA (red) and RNA (blue) templates
Amplification of both Rotavirus A (dsRNA) and Adenovirus (dsDNA) in a single multiplexed RT-qPCR assay, from inactivated crude viral lysates. The result illustrates that both the DNA and RNA viruses were amplified with high efficiency and sensitivity, demonstrating the ability of Lyo-Ready™ 1-Step RT-qPCR Virus Mix to detect low-copy number RNA and DNA targets simultaneously from a single sample.
Molecular diagnostic tests are progressively moving towards lyophilized formats. There are several advantages for this, including ambient temperature shipping and storage, extended shelf-life, reduced operating steps and potential errors and increased flexibility in sample volume. In order to be compatible with drying, however, enzyme preparations must be glycerol-free and include specialized excipients that preserve the mixture as it is exposed to various conditions including freezing, vacuum, and dehydration.
Lyo-Ready™ 1-Step RT-qPCR Virus Mix is a 2x RT-qPCR master mix and can be used for the development of both RNA and DNA based molecular diagnostic tests, it contains a separate lyo-compatible MMLV-RT and enzyme dilution buffer. The Lyo-Ready™ 1-Step RT-qPCR Virus Mix reverse transcriptase is also thermostable and has been optimized for amplification of DNA or RNA viruses with a high secondary structure (reverse transcriptase remains active at 55-60 °C).
|Description||Glycerol-free master mix containing Taq polymerase, RNase inhibitor, reaction buffer, dNTP, MgCl2 and lyo-excipients and separate reverse transcriptase and dilution buffer. Optimized for amplification of RNA high secondary structure from either extracted or intact virus samples.|
|Appearance||Clear, colorless solution|
|Hot Start||Antibody mediated|
|Application||Probe-based, real-time PCR, two-step RT-qPCR, one-step RT-qPCR|
|Sample type||RNA and/or DNA|
|Mix stability||See outer label|
|Assay stability||Up to 24 months at ambient temperature following lyophilization|
|Consistency||±0.5 Ct variance between test and reference sample|
|DNase/RNase Contamination||No detectable degradation|
FAQs: Lyo-Ready 1-Step RT-qPCR Virus Mix
Slope of standard 10-fold dilution curve indicates RT-qPCR efficiency. The efficiency of the RT-qPCR should be between 90–110% (−3.58 ≥ slope ≥ −3.1). If the efficiency is greater than 100%, this indicated inaccurate sample and reagent pipetting, if it is less than 100%, this indicates your samples may contain PCR inhibitors or your RT-qPCR primer and/or probe design may not be optimal.
• Accurate representation of target copy number
• Simple and rapid
• Fewer pipetting steps (reducing possible errors and contamination)
• Best option for high-throughput screening
• Best method when only a few assays are run repeatedly
• Multiplex qPCR of gene of interest and control can be done in single well, from same RNA sample
• Usually less sensitive as it is impossible to optimize the two reactions separately
• Difficult to troubleshoot RT step
• No stock of cDNA
So, one-step workflows are commonly favoured in molecular diagnostic tests, where archiving of cDNA is not required.
Yes, reaction conditions are the same and they will produce the same Ct values, even with multiplex RT-qPCR assays. This means that the liquid mixes can be used to create SOPs if you do not want to lyophilize and then later if lyophilization is required (for example to increase sensitivity), the SOP can be updated for lyophilization, it does not require completely new SOPs to be written.
Many fluorescent qPCR primer- and probe-based chemistries have been devised and are available from different commercial vendors for molecular diagnostic tests, the two most commonly used are:
• Hydrolysis (TaqMan) probes. The main advantages of using hydrolysis probes are high specificity, a high signal-to-noise ratio, and the ability to perform multiplex RT-qPCR reactions. The disadvantages are that the initial cost of the probe.
• Molecular beacons. Molecular beacons are highly specific, can be used for multiplexing, and if the target sequence does not match the beacon sequence exactly, hybridization and fluorescence will not occur. Unlike hydrolysis probes, molecular beacons are displaced but not destroyed during amplification and can be used for melt curve analysis if necessary. The main disadvantage is that they are difficult to design, requiring a stable hairpin stem that is strong enough that the molecule will not spontaneously fold into non-hairpin conformations but not be too strong, or it may not properly hybridize to the target.
The Lyo-Ready™ 1-Step RT-qPCR Virus Mix is inhibitor tolerance, but for even greater sensitivity, we have the sample specific (blood, saliva, urine and stool) mixes.
No-RT control reactions are useful for determining issues that may arise from the amplification of genomic DNA that may be present in a sample. However, many RNA transcripts are present at low abundance and for these transcripts, it is recommended to perform a No-RT control reaction if primer sets do not span exon-exon junctions. If the primers do span exon-exon junctions, or genomic DNA is not likely to interfere (when looking at RNA viruses in a sample for example) a No-RT control is not required.
Following lyophilization in the presence or absence of primers and probes, the Lyo‑Ready™ 1-Step RT-qPCR Virus Mix is stable for a minimum of 24 months at ambient temperature (17 – 23 °C). Following rehydration, the assay reproducibility, sensitivity and robustness will be the same as for a freshly made liquid mix, making the mixes ideal for point-of-care molecular diagnostic tests and microfluidic qPCR devices.
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