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Catalog Number | Includes | No. of Reactions |
---|---|---|
K1682 | Kit with dsDNase | 100 Reactions |
K1651 | Kit only | 20 Reactions |
K1652 | Kit only | 100 Reactions |
K1681 | Kit with dsDNase | 20 Reactions |
This kit allows synthesis of long cDNAs up to 20 kb at elevated temperatures (up to 65°C), superseding other systems' abilities to produce full-length cDNA. Due to increased synthesis rates the reaction can be completed in 30 minutes.
For reverse transcription the kit uses Maxima H Minus Reverse Transcriptase (RT), which is an advanced enzyme derived by in vitro evolution of MMLV RT.
The Maxima H Minus First Strand cDNA Synthesis Kit with dsDNase provides a dramatically simplified workflow that combines genomic DNA elimination and cDNA synthesis into one-tube procedure. The kit contains a novel double-strand-specific DNase (dsDNase) engineered to remove contaminating genomic DNA from RNA preps in two minutes without damage to quality or quantity of RNA. Highly specific dsDNase activity towards double-stranded DNA ensures that single-stranded DNA (such as cDNA and primers) is not cleaved, and dsDNase treated RNA can be directly added to reverse transcription.
Features of the Maxima H Minus First Strand cDNA Synthesis Kit include:
• Increased reaction temperatures—the first strand of cDNA can be synthesized within the 42–65°C temperature range
• High yields of full-length first strand cDNA—with RNA templates up to 20 kb
• Flexible priming—oligo(dT)18, random hexamer or gene-specific primers
• Integrated genomic DNA removal step with dsDNase kit
Applications
• First Strand cDNA synthesis for RT-PCR
• Construction of cDNA libraries
• Generation of probes for hybridization
• Antisense RNA synthesis
Contents
• Maxima H Minus Enzyme Mix
• Oligo(dT)18 and Random hexamer primers
• 5X RT Buffer
• dNTP Mix
• Nuclease-free water
First Strand Synthesis Kit with dsDNase also contains
• dsDNase and 10X dsDNase Buffer
Additional information about reaction components
• Maxima H Minus Enzyme Mix contains Maxima H Minus Reverse Transcriptase and RiboLock RNase Inhibitor. RiboLock RNase Inhibitor effectively protects RNA templates from degradation by RNases A, B, and C at temperatures up to 55°C.
• Oligo(dT)18 and random hexamer primers are supplied with the kit. Random hexamer primers bind non-specifically and are used to synthesize cDNA from all RNAs in a total RNA population. The oligo(dT)18 primer selectively anneals to the 3'-end of poly(A) RNA, synthesizing cDNA only from poly(A) tailed mRNA. Gene-specific primers may also be used with the kit to prime synthesis from a specified sequence.
• 10 mM dNTP Mix is a premixed aqueous solution of dATP, dTTP, dCTP, and dGTP.
• Nuclease-free water is provided for reaction set-up and dilution of sample DNA. The absence of endo-, exodeoxyribonucleases, ribonucleases, and phosphatases has been confirmed by appropriate quality tests.
• Maxima H Minus Enzyme Mix
• dsDNase
• 10X dsDNase Buffer
• Oligo(dT)18 and Random hexamer primers
• 5X RT Buffer
• dNTP Mix
• Nuclease-free water
Store at –20°C.
dsDNase can be inactivated by incubating the sample at 55°C for 5 min in the presence of 10 mM DTT.
It is generally beneficial to minimize RNase H activity when aiming to produce long transcripts for cDNA cloning. RNase H degrades RNA from RNA-DNA duplexes, which can result in truncated cDNA during reverse transcription of long mRNA. It is also recommended to use RNase H-minus RTs for template-independent addition of C nucleotides. In contrast, reverse transcriptases with intrinsic RNase H activity are often favored in qPCR applications.
All Thermo Scientific reverse transcriptases possess intrinsic TdT activity although at varying degrees depending upon the reaction conditions. For addition of template-independent C nucleotides (as for SMART and RACE experiments), this specific TdT activity can be induced by Mn2+. We would recommend Maxima H- or RevertAid H- minus RTs for this purpose.
No, dsDNase cleaves only double-stranded DNA. However, if ssDNA forms double-stranded structures, it will act as a target for dsDNase. Because of this, long and complex ssDNA may be partially degraded. Therefore we recommend additional dsDNase inactivation step for RT-PCR amplification of targets 3 kb or longer. The inactivation step should be performed by 5 min incubation at 55 degrees C in the presence of 10 mM DTT.
No. RT reaction composition inhibits dsDNase activity, and genomic DNA removal may be incomplete.
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