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Chapter 7
Prepare the Comparative C
T
Reactions
Prepare the Reaction Mix
145
Applied Biosystems 7500/7500 Fast Real-Time PCR System Getting Started Guide for Relative Standard Curve
and Comparative C
T
Experiments
Notes
Prepare the
Reaction Mix
IMPORTANT!
Prepare the reaction mix for each target assay separately.
1.
Label an appropriately sized tube for each reaction mix:
• 18S Reaction Mix
• EGR3 Reaction Mix
• MAOB Reaction Mix
• OGDH Reaction Mix
• OSGEP Reaction Mix
• SERPING1 Reaction Mix
2.
For the 18S assay, add the required components to the 18S Reaction Mix tube:
3.
Repeat step 2 for each remaining assay: EGR3, MAOB, OGDH, OSGEP, and SERPING1.
4.
Mix the reaction mix in each tube by gently pipetting up and down, then cap each tube.
5.
Centrifuge the tubes briefly to remove air bubbles.
6.
Place the reaction mixes on ice until you prepare the reaction plate.
Preparation
Guidelines
When you prepare your own comparative C
T
experiment:
• If your experiment includes more than one target assay, prepare the reaction mix for
each target assay separately.
• Include excess volume in your calculations to provide excess volume for the loss
that occurs during reagent transfers. Applied Biosystems recommends an excess
volume of at least 10%.
• Include all required components.
• Prepare the reagents according to the manufacturer’s instructions.
• Keep the assay mix protected from light (in the freezer) until you are ready to use it.
Excessive exposure to light may affect the fluorescent probes.
• Prior to use:
– Mix the master mix thoroughly by swirling the bottle.
– Resuspend the assay mix by vortexing, then centrifuge the tube briefly.
– Thaw any frozen samples by placing them on ice. When thawed, resuspend the
samples by vortexing, then centrifuge the tubes briefly.
Component
Volume (
µ
L) for
1 Reaction
Volume (µL) for
16 Reactions
(Plus 10% Excess)
TaqMan
®
Universal PCR Master Mix (2
✕
)
25.0
440.0
18S Assay Mix (20
✕
)
2.5
44.0
Water
17.5
308.0
Total Reaction Mix Volume
45.0
792.0