GeneRacer™ Kit with SuperScript™ III RT and TOPO TA Cloning™ Kit for Sequencing
GeneRacer™ Kit with SuperScript™ III RT and TOPO TA Cloning™ Kit for Sequencing
Invitrogen™

GeneRacer™ Kit with SuperScript™ III RT and TOPO TA Cloning™ Kit for Sequencing

The GeneRacer™ Kit provides a method to obtain full-length 5' and 3' ends of cDNA using known cDNA sequence fromRead more
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Catalog number L150201
Price (USD)
1,086.00
Each
Add to cart
Price (USD)
1,086.00
Each
Add to cart
The GeneRacer™ Kit provides a method to obtain full-length 5' and 3' ends of cDNA using known cDNA sequence from expressed sequence tags (ESTs), subtracted cDNA, differential display, or library screening. The kit ensures the amplification of only full-length transcripts via elimination of truncated messages from the amplification process. RACE PCR products can be quickly and easily cloned using either the Zero Blunt™ TOPO™ PCR Cloning Kit for Sequencing (blunt-end PCR products) or the TOPO TA Cloning™ for Sequencing Kit (PCR products with 3' A-overhangs). Using the protocols provided, the cDNA ends of rare (30 copies/cell) and long (9 kb) transcripts can be amplified and sequenced starting from 1 μg of total RNA. With the GeneRacer™ Kit you can:

• Generate cDNA from transcripts at least 10 kb in length
• Obtain the full-length 5´ end of rare transcripts at fewer than 30 copies per cell
• Clone the full-length 5´ and 3´ ends to construct complete cDNA sequenceSuperScript™ III RT
The GeneRacer™ Kit is available with SuperScript™ III Reverse Transcriptase (RT) for improved amplification of the full-length 5´ end from long and complex mRNA. The RNase H portion of SuperScript™ III RT has been mutated to avoid cleaving mRNA during cDNA synthesis. This increases the size and yield of cDNA. SuperScript™ III RT is more thermostable than wild-type RTs. This enables reverse transcription at higher temperatures, relaxing secondary structure of complex templates, and allowing cDNA synthesis to go to completion.How the GeneRacer™ Kit works
The GeneRacer™ Kit ensures that only transcripts containing full-length cDNA ends are amplified (see figure). The advanced protocol starts at the RNA level by specifically targeting only 5´ capped mRNA. In subsequent steps, the cap is removed and replaced with the GeneRacer™ RNA Oligo. During reverse transcription, the GeneRacer™ RNA Oligo sequence is incorporated into the cDNA. Only cDNA that is completely reverse transcribed will contain this known sequence. 5´ RACE PCR is then performed using the GeneRacer™ 5´ Primer specific to the GeneRacer™ RNA Oligo sequence and a gene-specific primer. The result is amplified DNA that contains the full-length 5´ cDNA sequence.Sensitivity and length
To demonstrate the ability of the GeneRacer™ Kit to capture the full-length 5´ cDNA end, the 5´ ends of genes with known transcriptional start sites were amplified. Starting with total RNA and following the GeneRacer™ protocol, both long transcripts (10 kb) and rare messages present at 0.01%, or 30 copies per cell, were amplified (see figure).
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For Research Use Only. Not for use in diagnostic procedures.
Specifications
Bacterial or Yeast StrainTOP10
Cloning MethodTOPO TA
FormatKit
For Use With (Application)Reverse Transcription
IncludesGeneRacer Module: 2 x 1.5mL Sterile Water, 24μL RNaseOut, 6μL each Calf Intestinal Phosphatase (CIP), CIP Buffer, Tobacco Acid Pyrophosphatase (TAP), 10X TAP Buffer, T4 RNA Ligase, 10X T4 RNA Ligase Buffer, and 10mM ATP, 6 x 250ng GeneRacer RNA Oligo, 2 x 1mL Phenol/Chloroform, 36μL Mussel Glycogen, 200μL Sodium Acetate (3M), 225μL each GeneRacer 5' Primer, 5' Nested Primer, 3' Primer, and 3' Nested Primer, 20μL Control HeLa Total RNA (500ng/μL), 15μL each Control Primer A and Control Primer B.1; SuperScript III RT Module: 6μL SuperScript III Reverse Transcriptase (200U/μL), 24μL 5X First Strand Buffer, 15μL DTT (0.1M), 6μL RNaseH (2U/μL), 6μL Random Primers (100ng/μL), 6μL GeneRacer Oligo dT Primer (900ng/μL), 6μL dNTP Mix (10mM each), 10 S.N.A.P. Columns, TOPO TA Cloning Kit for Sequencing (-20°C), Sufficient reagents and One Shot TOP10 Chemically Competent E. coli
Product LineGeneRacer™, SuperScript™, TA Cloning™, TOPO™
Product TypeCloning Kit
Quantity1 Kit
VectorpCR4-TOPO TA
Unit SizeEach
Contents & Storage
Store each module as indicated:

GeneRacer™ Module (-20°C):

• 2 × 1.5 ml Sterile Water

• 24 μl RNaseOut™

• 6 μl each Calf Intestinal Phosphatase (CIP), CIP Buffer, Tobacco Acid Pyrophosphatase (TAP), 10X TAP Buffer, T4 RNA Ligase, 10X T4 RNA Ligase Buffer, and 10 mM ATP

• 6 × 250 ng GeneRacer™ RNA Oligo

• 2 × 1 ml Phenol/Chloroform

• 36 μl Mussel Glycogen

• 200 μl Sodium Acetate (3 M)

• 225 μl each GeneRacer™ 5′ Primer, 5′ Nested Primer, 3′ Primer, and 3′ Nested Primer

• 20 μl Control HeLa Total RNA (500 ng/μl)

• 15 μl each Control Primer A and Control Primer B.1

SuperScript™ III RT Module (-20°C)

• 6 μl SuperScript™ III Reverse Transcriptase (200 U/μl)

• 24 μl 5X First Strand Buffer

• 15 μl DTT (0.1 M)

• 6 μl RNaseH (2 U/μl)

• 6 μl Random Primers (100 ng/μl)

• 6 μl GeneRacer™ Oligo dT Primer (900 ng/μl)

• 6 μl dNTP Mix (10 mM each)

10 S.N.A.P.™ Columns (room temperature)

TOPO TA Cloning™ Kit for Sequencing (-20°C)

• Sufficient reagents and One Shot™ TOP10 Chemically Competent E. coli (store at -80°C) to clone 10 GeneRacer™ PCR products; GeneRacer Module (-20°C), SuperScript III RT Module (-20°C), Competent E. coli (store at -80°C), S.N.A.P. Columns (room temperature), TOPO TA Cloning Kit for Sequencing (-20°C)

Frequently asked questions (FAQs)

How long can I store the cDNA from my reverse transcription step?

You can store your cDNA at 2-6 degrees C for up to 24 hours. For long-term storage, store the cDNA at -15 to -25 degrees C and add EDTA to a final concentration of 1 mM to prevent degradation.

I'm getting PCR products from my 5' RACE, but they are not full length. What should I do?

The GeneRacer method is designed to ensure that only full-length messages are ligated to the GeneRacer RNA Oligo and PCR amplified after cDNA synthesis. It is highly recommended that you clone your RACE products and analyze at least 10-12 colonies to ensure that you isolate the longest message. Many genes do not have only one set of transcription start sites but rather multiple transcription start sites spanning sometimes just a few or other times a hundred or even more bases. Cloning of the RACE products and analyzing multiple colonies ensues that you detect the diversity of the heterogeneous transcription start sites of your gene. It is also possible that you might obtain PCR products that may not represent the full-length message for your gene. PCR products that do not represent full-length message may be obtained because:

-RNA degradation after the CIP reaction creates new truncated substrates with a 5' phosphate for ligation to the GeneRacer RNA Oligo. Be sure to take precautions to ensure that the RNA is not degraded.
-CIP dephosphorylation was incomplete. Increase the amount of CIP in the reaction or decrease the amount of RNA.
-PCR yielded a PCR artifact and not true ligation product. Optimize your PCR using the suggestions described above.

I'm seeing RACE PCR artifacts in my GeneRacer experiment. What am I doing wrong?

RACE PCR artifacts or nonspecific PCR bands can result from one or more of the following:

-Nonspecific binding of GSPs to other cDNAs resulting in the amplification of unrelated products as well as desired products.
-Nonspecific binding of GeneRacer primers to cDNA resulting in PCR products with GeneRacer primer sequence on both ends of the PCR product.
-RNA degradation.
-Contamination of PCR tubes or reagents.
Note: Artifacts usually result from less than optimal PCR conditions and can be identified in negative control PCR.

I'm getting unexpected bands after electrophoretic analysis of my amplified RT-PCR products. Can you please offer some suggestions?

Please see the following causes and suggestions:
Contamination by genomic DNA or an unexpected splice variant - Pretreat RNA with DNase I, amplification grade (Cat. No 18068015).
Design primers that anneal to sequences in exons on both sides of an intron or at the exon/exon boundary of the mRNA to differentiate between amplified cDNA and potential contaminating genomic DNA.
To test if products were derived from DNA, perform a minus RT control.
Nonspecific annealing of primers - Vary the PCR annealing conditions.
Use a hot-start PCR polymerase.
Optimize magnesium concentration for each template and primer combination.
Primers formed dimers - Design primers without complementary sequences at the 3' ends.

I'm getting no bands after electrophoretic analysis of my amplified RT-PCR products. Can you please offer some tips?

Please see the following causes and suggestions:

Procedural error in first-strand cDNA synthesis - Use high-quality RNA as a control to verify the efficiency of the first-strand reaction.
RNase contamination - Add control RNA to sample to determine if RNase is present in the first-strand reaction. Use an RNase inhibitor in the first-strand reaction.
Polysaccharide co-precipitation of RNA - Precipitate RNA with lithium chloride to remove polysaccharides, as described in Sambrook et al.
Target mRNA contains strong transcriptional pauses - Use random hexamers instead of oligo(dT) in the first-strand reaction, increase the temperature, and use PCR primers closer to the 3' terminus of the target cDNA.
Too little first-strand product was used in PCR - Use up to 10% of first-strand reaction per 50 mL PCR.
Gene-specific primer was used for first-strand synthesis - Try another set of GSP or switch to oligo(dT). Make sure the GSP is the antisense of the sequence.
Inhibitors of RT present - Remove inhibitors by ethanol precipitation of mRNA preparation before the first-strand reaction. Include a 70% (v/v) ethanol wash of the mRNA pellet. Note: inhibitors of RT include SDS, EDTA, guanidinium salts, formamide, sodium pyrophosphate, and spermidine.
RNA has been damaged or degraded - Ensure that high-quality, intact RNA is being used.
Annealing temperature is too high - Decrease temperature as necessary and/or use touchdown PCR.