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Invitrogen™ Oligo(dT)20 Primer

Catalog No. 18418020
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18418020 50 μL
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Catalog No. 18418020 Supplier Invitrogen™ Supplier No. 18418020
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Description

Used for first-strand cDNA synthesis with reverse transcriptase at temperatures of ≥50°C, Oligo(dT)20 Primer is a string of 20 deoxythymidylic acid residues that hybridizes to the poly(A) tail of mRNA.

Used for first-strand cDNA synthesis with reverse transcriptase at temperatures of ≥50°C, Oligo(dT)20 Primer is a string of 20 deoxythymidylic acid residues that hybridizes to the poly(A) tail of mRNA. Oligo(dT)20 is recommended for use with SuperScript™ III Reverse Transcriptase, ThermoScript Reverse Transcriptase, or Cloned AMV Reverse Transcriptase.

Quality Control: This product is qualified in a first-strand cDNA synthesis reaction

Order Info

Shipping Conditions: Approved for shipment on Wet or Dry Ice

Specifications

Product Type Primer
Content And Storage • Oligo(dT)16 Primer (50 μL at 50 μM)

Store at –15 to –25°C.
Aliquot to avoid repeated freezing and thawing.
5'Primer Modification Phosphate
Primer Length 20-mer
Primer Sequence 5'd PO4 [(T)20]3'
Purification Method Gel-purified, Desalted
Shipping Condition Approved for shipment on Wet or Dry Ice
Concentration 50 μM
Primer Oligo dT
Quantity 50 μL
For Use With (Application) First-strand cDNA Synthesis
Form Liquid
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Frequently Asked Questions (FAQs)

Which components of the SuperScript III First Strand Synthesis System for RT-PCR are available for purchase separately?

The following components are available as stand-alone items:

- Superscript III Reverse Transcriptase (Cat. Nos. 18080093, 18080044, 18080085)
- Oligo (dT)20 Primer (Cat. No. 18418020)
- Random hexamers (Cat. No. 48190011)
- 10 mM dNTP Mix (Cat. Nos. 18427013, 18427088)
- RNAseOUT Recombinant Ribonuclease Inhibitor (Cat. No. 10777019)
- E. coli RNAse H (Cat. Nos. 18021014, 18021071)

How does the Anchored Oligo(dT)20 Primer differ from standard oligo(dT) primers?

Anchored Oligo(dT) primers have 2 random bases at the 3' end of the stretch of Ts. The first random base is either an A, G, or C, while the second can be any of the 4 standard nucleotides, i.e., A, T, G or C. The use of anchored oligo(dT) primers results in increased cDNA synthesis yields.
For first-strand cDNA synthesis, is it better to use oligo(dT), random hexamers, gene-specific primer (GSP), or combination of these primers?

The choice of primer depends on your experimental goals. Oligo(dT) is recommended when using total RNA for cDNA synthesis. It is the key to full-length cDNA synthesis. Random hexamers give a series of short first-strand products spanning the entire mRNA. Use of random hexamers may be helpful if the PCR fragment is at the 5´ end of a large mRNA. To ensure full-length cDNA synthesis of large transcripts, oligo(dT) can be added along with random hexamers during first-strand synthesis. Gene-specific primers (GSP) for cDNA synthesis may also be used and are required in a few applications such as 5´ RACE and qRT-PCR. For GC-rich templates or templates rich in secondary structure, a GSP may not work as well as priming with oligo dT for first-strand synthesis. If an RT-PCR is problematic, trying different options of oligo dT, random primers and/or GSP for priming first-strand synthesis may resolve the issue. Oligo(dT)20 primer (Cat. No. 18418-020) is recommended for use with SuperScript III Reverse Transcriptase (Cat. no. 18080-044), ThermoScript Reverse Transcriptase (Cat. No. 12236-014), Thermo-X Reverse Trascriptase (Cat. No. 11150-025), and Cloned AMV Reverse Transcriptase (Cat. No. 12328-019).

Reference:
Frohman,M.A., Dush,M.K., Martin, G.R. (1988) Proc. Nat. Acad. Sci USA 85, 8998

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