NZY First-Strand cDNA Synthesis Kit (MB125)

Refrigerated package



Description: NZY First-Strand cDNA Synthesis Kit is a system that includes all the necessary components to synthesize first-strand cDNA, except the template RNA.The resulting single-stranded cDNA is suitable for use in real-time quantitative Reverse Transcription PCR (RT-qPCR). NZY First-Strand cDNA Synthesis Kit is formulated to provide high yields of full-length cDNA products and to increase sensitivity in RT-qPCR. Starting material can range from 10 pg up to 5 µg of total RNA. The kit includes a combination of random hexamers and oligo(dT)18 primers in order to increase sensitivity. The primers are included in the NZYRT 2× Master Mix, which also contains dNTPs, MgCl2 and an optimized RT buffer. NZYRT Enzyme Mix includes both the NZY Reverse Transcriptase (RNase H minus) and the NZY Ribonuclease Inhibitor in order to protect RNA against degradation due to ribonuclease contamination. RNase H (from E. coli) is provided in a separate tube to specifically degrade the RNA template in cDNA:RNA hybrids after the first-strand cDNA synthesis. This procedure will improve the sensitivity of subsequent RT-qPCR reaction since PCR primers will bind more easily to the cDNA.

– Provides high yields of full-length cDNA products
– Formulated to increase sensitivity in RT-qPCR
– Primer type: oligo(dT)18 and random hexamers
– Starting material: 10 pg to 5 µg of total RNA
– Thermostable – working temperature range 37-50 ºC
– Convenient and reliable

– First-strand cDNA synthesis for use in real-time quantitative RT-PCR (RT-qPCR)
– Two-step RT-PCR assays
– Ideal for high GC-content templates due to the optimum activity at 50 ºC

High quality cDNA with low levels of starting RNA:
NZY First-Strand cDNA Synthesis Kit is an ideal choice for reverse transcription of low abundant RNA templates. NZYRT Enzyme Mix present in the kit shows high sensitivity, allowing synthesis of a wide range of template amounts.

NZY First-Strand cDNA Synthesis kit- Figure1

A 10-fold serial dilution of total RNA from mouse liver (1 μg to 10 pg) was reverse transcribed in a 20 μL reaction using the NZY First-Strand Synthesis Kit. 1 μL of the resultant cDNA was then used as template in an end-point PCR using specific primers for amplification of the glyceraldehyde-3-phosphate dehydrogenase (GAPDH) gene with Supreme NZYTaq II DNA polymerase.  NC: No template control. Lane M: NZYDNA Ladder III.

– Storage conditions: Store all kit components at -20ºC
– Shipping conditions: Shipped with dry ice

– NZYRT Enzyme Mix
– NZYRT 2x Master Mix
– NZY RNase H (E. coli)
– DEPC-treated H2O

Reverse Transcription kits available at NZYTech: Selection Guide


1. NZY First-Strand cDNA Synthesis Kit, separate oligos
2. NZY M-MuLV First-Strand cDNA Synthesis Kit, separate oligos

Product Brochure EN
Certificate of Analysis YL102
Certificate of Analysis YL101
Certificate of Analysis YL091
Certificate of Analysis NM082
Certificate of Analysis NM081
Certificate of Analysis NM052
Certificate of Analysis NM051
Certificate of Analysis NM031
Certificate of Analysis NM011

1. Which components of the NZY First-Strand cDNA Synthesis Kit for RT-PCR are sold separately? 
The following components of the kit are available for purchase as individual products:
NZYReverse Transcriptase (Cat. No. MB124)
NZYRibonuclease Inhibitor (Cat. No. MB084)
Oligo (dT)18 primer mix (Cat. No. MB12801)
Random hexamer mix (Cat. No. MB12901)
NZYRNase H (E. coli) (Cat. No. MB085)

2. Should I treat the synthesized cDNA with RNase H before PCR?
Addition of RNase H after first-strand synthesis will degrade the RNA used as template, by removing it from the cDNA:RNA hybrid molecule. The RNA is still present when using RNase H versions of reverse transcriptase, as is the case of the NZYReverse Transcriptase. Presence of RNA during PCR could inhibit annealing of the primers to the cDNA and then affect the amplification reaction, especially for long fragments. However, the 95°C denaturing step could cause RNA degradation of the RNA-cDNA hybrids and therefore RNase H treatment may not be necessary. We recommend performing RNase H digestion before PCR when using lower levels of template or when amplifying long fragments.

 3. How much synthesized cDNA should be used in a PCR reaction?
Do not exceed 10% of the final PCR reaction volume. The volume of cDNA used will depend on the amount of RNA used as template for first-strand synthesis, as well as the abundance of the target gene.

 4. Little or no RT-PCR/RT-qPCR amplification product is observed. What should I do?
This may result from several factors, such as:
a) RNA damage or degradation. Analyze RNA by denaturing gel electrophoresis to verify nucleic acid integrity. Use aseptic conditions while working with RNA to prevent RNase contamination. Replace RNA if necessary.
b) Presence of RT inhibitors. Some inhibitors of RT enzymes include: SDS, EDTA, glycerol, sodium phosphate, spermidine, formamide and guanidine salts. They can be problematic if present in smaller reaction volumes. If necessary, remove inhibitors by ethanol precipitation of the RNA preparation before use; wash the pellet with 70% (v/v) ethanol.
c) Not enough starting RNA. Increase the concentration of starting RNA.

5. What to do when unexpected bands are observed after electrophoretic analysis of PCR products using the synthesized cDNA as template?
This may result from several factors, such as:
a) Contamination by genomic DNA. To test if products were derived from DNA, perform a no-RT control during first-strand cDNA synthesis. If amplification products are detected after the PCR reaction in the absence of reverse transcriptase, it may be necessary to eliminate residual genomic DNA from the RNA sample. A RNAse-free DNase may be used (pre-treatment RNA). The DNase volume should not exceed 10% of the total reaction volume.
b) Non-specific annealing of primers. Adjust annealing conditions and/or use a DNA polymerase with hot-start capacity (e.g. Supreme NZYTaq II DNA polymerase, cat. No. MB355). Optimize primers and magnesium concentration.
c) Primer-dimers. Adjust annealing conditions and/or design another set of primers without complementary sequences. Include a positive control in the PCR, i.e. a template that will be correctly amplified with the primers that you designed.

Genetic diversity of norovirus in children under 5 years of age with acute gastroenteritis from Angola
Esteves A, Nordgren J, Tavares C, Fortes F, Dimbu R, Saraiva N, Istrate C
Epidemiology & Infection, 2018

The role of epigenetic modifiers in extended cultures of functional hepatocyte-like cells derived from human neonatal mesenchymal stem cells
Cipriano M, Correia JC, Camões SP, Oliveira NG, Cruz P, Cruz H, Castro M, Ruas JL, Santos JM, Miranda JP
Archives of Toxicology, 2017

Multiple Phlebovirus (Bunyaviridae) genetic groups detected in Rhipicephalus, Hyalomma and Dermacentor ticks from southern Portugal
Pereira A, Figueira L, Nunes M, Esteves A, Cotão AJ, Vieira ML, Maia C, Campino L, Parreira R
Ticks and Tick-borne Diseases, 2017

Characterization of rotavirus infection in children with acute gastroenteritis in Bengo province, Northwestern Angola, prior to vaccine introduction
Gasparinho C, Piedade J, Mirante MC, Mendes C, Mayer C, Vaz Nery S, Brito M, Istrate C
PLoS One, 2017

Self-assembled 3D spheroids and hollow-fibre bioreactors improve MSC-derived hepatocyte-like cell maturation in vitro
Cipriano M, Freyer N, Knöspel F, Oliveira NG, Barcia R, Cruz PE, Cruz H, Castro M, Santos JM, Zeilinger K, Miranda JP
Archives of Toxicology, 2017

Molecular epidemiology of rotavirus in four provinces of Angola before vaccine introduction
Esteves A, Nordgren J, Pereira J, Fortes F, Dimbu R, Saraiva N, Mendes C, Istrate C
Journal of Medical Virology, 2016

Cell surface protease activation during RAS transformation: Critical role of the plasminogen receptor, S100A10
Madureira PA, Bharadwaj AG., Bydoun M, Garant K, O’Connell P, Lee P, Waisman DM
Oncotarget, 2016

Enhancing glioblastoma cell sensitivity to chemotherapeutics: A strategy involving survivin gene silencing mediated by gemini surfactant-based complexes
Cruz RQ, Morais CM, Cardoso AM, Silva SG, Vale ML, Marques EF, Pedroso de Lima MC, Jurado AS
European Journal of Pharmaceutics and Biopharmaceutics, 2016

Histopathological and in vivo evidence of regucalcin as a protective molecule in mammary gland carcinogenesis
Marques R, Vaz CV, Maia CJ, Gomes M, Gama A, Alves G, Santos CR, Schmitt F, Socorro S
Experimental Cell Research, 2015

Aging-associated changes in oxidative stress, cell proliferation, and apoptosis are prevented in the prostate of transgenic rats overexpressing regucalcin
Vaz CV, Marques, R, Maia, CJ, Socorro S.
Translational Research, 2015

5a-Dihydrotestosterone regulates the expression of L-type calcium
Marques R, Peres CG, Vaz CV, Gomes IM, Figueira MI, Cairrão E, Verde I, Maia M, Socorro S
Medical Oncology, 2015

Gemini surfactants mediate efficient mitochondrial gene delivery and expression
Cardoso AM, Morais CM, Cruz AR, Cardoso AL, Silva SG, do Vale ML, Marques EF, Pedroso de Lima MC, Jurado AS.
Mol. Pharmaceutics, 2015

Molecular and functional characterization of an invertase secreted by Ashbya gossypii
Aguiar TQ, Dinis C, Magalhães F, Oliveira C, Wiebe MG, Penttila M, Domingues L
Molecular Biotechnology, 2014

Gilthead seabream (Sparus aurata) immune responses are modulated after feeding with purified antinutrients
Costas B, Couto A, Azeredo R, Machado M, Krogdahl A, Oliva-Teles A
Fish & Shellfish Immunology, 2014

You may also like…