Chapter 3
Prepare the Relative Standard Curve Reactions
Prepare the Sample Dilutions
53
Applied Biosystems 7500/7500 Fast Real-Time PCR System Getting Started Guide for Relative Standard Curve
and Comparative C
T
Experiments
Notes
Preparation
Guidelines
When you prepare your own relative standard curve experiment, Applied Biosystems
recommends:
• That you first extract DNA or RNA from the tissue or sample.
• The following templates:
–
Complementary DNA (cDNA)
– cDNA reverse-transcribed from total RNA
samples using a High-Capacity cDNA Reverse Transcription Kit.
–
RNA
– Purified total RNA or mRNA extracted from tissue or sample.
–
Genomic DNA (gDNA)
– Purified gDNA already extracted from tissue or
sample.
For More
Information
For more information on:
• Preparing cDNA templates – Refer to the
Applied Biosystems High-Capacity cDNA
Reverse Transcription Kits Protocol
. The protocol is not shipped with the High-
Capacity cDNA Reverse Transcription Kits. You can download the protocol from:
http://docs.appliedbiosystems.com/search.taf
• Preparing RNA or gDNA templates – Refer to the protocol for the purification
reagents that you select. To locate Applied Biosystems purification reagents, visit:
http://www.appliedbiosystems.com/
Prepare the Sample Dilutions
Perform sample dilutions before adding the samples to the final reaction mix. Dilute the
samples using the volumes that were calculated by the 7500 software (“To complete the
Sample Dilution Calculations tab:” on page 40).
About the
Example
Experiment
For the relative standard curve example experiment:
• Sample dilutions are necessary because the sample volume is limited to 10% of the
total reaction volume in the 7500 software. Because the total reaction volume is
50
µ
L/reaction, the sample volume is 5
µ
L/reaction.
• The stock sample concentration is 100 ng/
µ
L. After diluting the sample according to
the Sample Dilutions Calculations table, the sample has a concentration of
50 ng/
µ
L. Adding 17
µ
L at this concentration to the final reaction mix volume of
34
µ
L yields a 1
✕
concentration in the final reaction.
• The volumes calculated in the software are:
Sample Name
Stock
Concentration
(ng/µL)
Sample
Volume (µL)
Diluent
Volume (µL)
Total Volume
of Diluted
Sample (µL)
Liver
100.0
17.0
17.0
34.0
Kidney
100.0
17.0
17.0
34.0