This protocol describes the detailed experimental procedure for real-time RT-PCR using SYBR Green I as mentioned in Xiaowei Wang and Brian Seed (2003) A PCR primer bank for quantitative gene expression analysis. Nucleic Acids Research 31(24): e154; pp.1-8. Please refer to this paper and the PrimerBank Help page for more background information. The procedure begins with reverse transcription of total RNA. The cDNA is then used as template for real-time PCR with gene specific primers. You may need to modify this protocol if you use different reagents or instruments for real-time PCR. 下载本文PDF格式：http://www.bbioo.com/Soft/2007/1076.htm 

Time required
 
cDNA synthesis: 2 hours.
real-time PCR: 2 hours.
Dissociation curve analysis: 0.5 hour.
 
Reagents and Equipments
 
 
·        Oligonucleotide Primers. Gene specific primers are retrieved from PrimerBank (http://pga.mgh.harvard.edu/primerbank/). These primers are ordered from the MGH DNA Core facility (https://dnacore.mgh.harvard.edu/synthesis/index.shtml). All the primers are desalted and both UV absorbance and capillary electrophoresis are used to assess the quality of primer synthesis. 

·        Mouse total liver RNA (Stratagene).
·        Mouse total RNA master panel (BD Biosciences / Clontech). 
·        SYBR Green PCR master mix, 200 reactions  (Applied Biosystems).
·        Optical tube and cap strips (Applied Biosystems).
·        SuperScript First-Strand Synthesis System for RT-PCR (Invitrogen).
·        25 bp DNA ladder (Invitrogen).
·        ABI Prism 7000 Sequence Detection System (Applied Biosystems).
·        ABI Prism 7000 SDS software (Applied Biosystems).
·        3% ReadyAgarose Precast Gel (Bio-Rad).
·        Agarose gel electrophoresis apparatus (Bio-Rad).

Detailed procedure
 
Reverse Transcription
 
Reverse Transcription is carried out with the SuperScript First-Strand Synthesis System for RT-PCR. The following procedure is based on Invitrogen’s protocol. 
 
1. Prepare the following RNA/primer mixture in each tube:

4. Add the reaction mixture to the RNA/primer mixture, mix briefly, and then place at room temperature for 2 min.
5. Add 1 ml (50 units) of SuperScript II RT to each tube, mix and incubate at 25°C for 10 min.
6. Incubate the tubes at 42°C for 50 min, heat inactivate at 70°C for 15 min, and then chill on ice.
7. Add 1 ml RNase H and incubate at 37°C for 20 min.
8. Store the 1st strand cDNA at -20°C until use for real-time PCR.

Real-time PCR

1. Normalize the primer concentrations and mix gene-specific forward and reverse primer pair. Each primer (forward or reverse) concentration in the mixture is 5 pmol/ml.

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