This document provides instructions for setting up and running a real-time PCR experiment using the Stratagene Mx3000P QPCR System and RT2 Profiler PCR Arrays. It describes how to create a PCR protocol template file for the arrays, load the template for a run, perform the run, and analyze the amplification plots to calculate threshold cycle (Ct) values for each well. The instructions include setting baseline and threshold levels manually on amplification plots to determine Ct values.
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In an ever-changing landscape of one digital disruption after another, companies and organisations are looking for new ways to understand their target markets and engage them better. Increasingly they invest in user experience (UX) and customer experience design (CX) capabilities by working with a specialist UX agency or developing their own UX lab. Some UX practitioners are touting leaner and faster ways of developing customer-centric products and services, via methodologies such as guerilla research, rapid prototyping and Agile UX. Others seek innovation and fulfilment by spending more time in research, being more inclusive, and designing for social goods.
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1. Technical Note
Stratagene Mx3000P QPCR System
Instrument Setup Instructions for RT2Profiler™ PCR Arrays
Preparation
Before the Experiment (Presetting the Machine will save time for your run):
Set up a PCR protocol template file on the Stratagene MxPro QPCR Software as follows:
Open the Stratagene MxPro QPCR Software on the computer that is connected to the Stratagene Mx3000P
system. The New Experiment Options dialog box will appear.
®
Select Real-time SYBR Green (with Dissociation Curve) and click OK. The new plate document will appear.
1)
2)
On the top panel of the plate document, select Mx3000P (4 filter set plate).
On the Plate Setup page (See Figure 1), click the square button with the word “All” on the top left corner of
the diagram of the 96-well plate to select all wells. The selected wells will be highlighted in green.
3)
On the right panel, select Well-type
Select Reference Dye ROX.
4)
Click Next to go to the Thermal Profile Setup page (See Figure 2). To change the default setting for the
thermal profile, click directly on the number you want to change on the profile. Enter 95.0° for 10:00
C
minutes for Segment 1 with 1 Cycle; for Segment 2, 95.0° for 0:15 (15 seconds) followed by 60.0° for
C
C
C
1:00 minute with 40 Cycles (40 cycles). Delete the step at 72° for 0:30 (30 seconds) in Segment 2 by
clicking directly on the line for this step to select and then click on the Delete button on the right panel (or
press the “Delete” key on the keyboard).
For the dissociation curve in Segment 3, the profile should be 95.0° for 1:00 minute, 55.0° for
C
C
0:30 (30 seconds) and 95.0° for 0:30 (30 seconds) with 1 Cycle . Double check to see if an
C
Endpoints Data Collection Marker is placed above step 2 (60.0° for 1:00 minute) of Segment 2
C
and an All Points Data Collection Marker is present between step 2 and step 3 of Segment 3.
Unknown. Choose SYBR and ROX for Collect Fluorescence Data.
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2. Technical Note
5)
2
Then select File Save As to save the template file. Save the file under the filename “RT Profiler™ PCR
Array Protocol Template”.
2
Alternatively, download the PCR protocol template file (RT Profiler™ PCR Array Protocol TemplateStratagene.mxp) from the SABiosciences website (http://www.SABiosciences.com/home.php) .
Performing Real-Time PCR Detection
1)
2)
3)
4)
5)
6)
Check to verify that the power status indicator (the lower LED on the front of the instrument) is lit and the
Ready status indicator (the upper LED) is continuously lit (glowing green). A blinking Ready status
indicator indicates an experiment is already in process; if the Ready status indicator is off, the instrument is
not available or ready to run an experiment.
Ensure the reaction mix in each well of your reaction plate is free of any bubbles and positioned at the
bottom of the well. If not, centrifuge the plate at ~1000 g for 45 seconds.
Open the door located on the front of the instrument by sliding it all the way to the top. To expose the
thermal block, pull forward on the hot-top handle and lift the hot-top up and away from the thermal block.
Place your plate in the plate holder with the last row (row H) facing front. Well A1 should be positioned at
the top-left corner of the thermal block. Make sure the plate is properly aligned in the holder. Close the
hot-top assembly by pressing down the hot-top and pushing the handle back into its original place. Slide
down the door to close.
Open the Stratagene MxPro QPCR Software. Click cancel when the New Experiment Options dialog box
appears.
2
Select File Open. Load the RT Profiler™ PCR Array Template file. This will load the previously saved
setup to the new plate document. Save the new document under a new filename.
Click Start Run to begin the PCR run. Wait for about 30 seconds for the initial priming. The estimated run
time will then appear on the screen.
Page 2 of 3
3. Technical Note
After the PCR Run
1)
2)
Select Analysis on the top panel of the plate document page and choose the Analysis Selection/Setup
page. Click the square button with the word “All” on the top left corner of the diagram of the 96-well plate to
select all wells. The selected wells will be colored in green.
Select the Results page. On the right panel, choose Amplification plots for Area to analyze. Select 40
for Last cycle. Select Fluorescence dRn. Then follow the procedures below to calculate the threshold
cycle (Ct) for each well (See Figure 3):
(We highly recommend manually setting the Baseline and Threshold Value)
a) To define the Baseline, use the Linear View of the amplification plots. Double click one of the axes.
The window for Graph Properties will appear. For both Y and X-Axes, select Lo -> Hi for Orientation
and Use Automatic Limits. Select Linear Scale for Y-Axis and also for X-Axis. Then click OK. With
the linear plots, determine the cycle number at which the earliest amplification can be seen. Select
Options Analysis Term Settings. Set the Non-adaptive baseline to start from cycle number 2
through two cycle values before the earliest visible amplification. Click OK.
b) To define the Threshold Value, use the Log View of the amplification plots. Open the Graph
Properties window by double clicking one of the axes as above. Select Log Scale for Y-Axis. Then
click OK. With the log plots, place the threshold line above the background signal but within the lower
third of the linear phase of the amplification plot.
c)
Select Text Report in Area to analyze to display the results. On the right panel, select to display the
Column for Well, Well type, Threshold, Ct and Tm Product 1 for each well. In Assays Shown box
at the bottom of the screen, deselect the ROX button and make sure the SYBR button is selected so
that only the data for SYBR Green will be displayed in the text report. To export the result to an Excel
spreadsheet, select File Export Text Report Export Text Report to Excel and save the file as an
Excel file.
Page 3 of 3