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First-Strand cDNA Synthesis Using SuperScript™ II RT
A 20-¦ÌL reaction volume can be used for 1 ng¨C5 ¦Ìg of total RNA or 1¨C500 ng
of mRNA.
1. Add the following components to a nuclease-free microcentrifuge tube:
Oligo(dT)12-18 (500 ¦Ìg/mL) or 1 ¦ÌL
50¨C250 ng random primers or
2 pmole gene-specific primer (GSP)
1 ng to 5 ¦Ìg total RNA or x ¦ÌL
1¨C500 ng of mRNA
1 ¦ÌL dNTP Mix (10 mM each) 1 ¦ÌL
Sterile, distilled water to 12 ¦ÌL
2. Heat mixture to 65¡ãC for 5 min and quick chill on ice. Collect the
contents of the tube by brief centrifugation and add:
5X First-Strand Buffer 4 ¦ÌL
0.1 M DTT 2 ¦ÌL
RNaseOUT™ (40 units/¦ÌL) (optional)* 1 ¦ÌL
*RNaseOUT™ (Cat. No. 10777-019) is required if using <50 ng starting RNA.
3. Mix contents of the tube gently. If you are using oligo(dT)12-18 or GSP,
incubate at 42¡ãC for 2 min. If you are using random primers, incubate at
25¡ãC for 2 min.
4. Add 1 ¦ÌL (200 units) of SuperScript™ II RT and mix by pipetting gently
up and down.
If you are using less than 1 ng of RNA, reduce the amount of
SuperScript™ II RT to 0.25 ¦ÌL (50 units) and add sterile, distilled water to
a 20 ¦ÌL final volume.
If you are using random primers, incubate tube at 25¡ãC for 10 min.
5. Incubate at 42¡ãC for 50 min.
6. Inactivate the reaction by heating at 70¡ãC for 15 min.
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