Our team worked sufficiently to set up the reaction using pipetting techniques. We had 8 tubes, one being the positive control and another being the negative control. The other six tubes contained the 100 nanoliter PCR reactions. After each reaction was set up and the lids on each tube were closed tightly, we transferred them to the PCR machine. The pre-lab was beneficial because it prepared us for the use of a pipettor by listing each each step required to get successful measurements. We understood that the first stop of the pipettor should be used for obtaining the volume of solution noted on the side of the device, while the second stop is used for injecting the solution into the tubes. It is because of the accuracy of the pipettor the the final reactions had the same amount of liquid. We did not see any excess liquid in the tubes after transferring it. Labeling was also successful, as we followed the instructions given to us.
Fluorimeter Procedure
Smart Phone Camera Settings
Type of Smartphone: iPhone 5
Flash: Off
ISO setting: No setup option
White Balance: No setup option
Exposure: No setup option
Saturation: No setup option
Contrast: No setup option
Camera set-up
The phone was placed in the cradle and oriented to face the fluorimeter. The camera on the phone was higher than the fluorimeter so two small tupperware tops and a notebook were placed under the fluorimeter to make the camera level with the fluorimeter. A usb drive was also placed in the cradle along with the phone so the phone would not be at an angle when taking pictures of the drop. The usb drive was between the back of the phone and the cradle so the drop on the fluorimeter and the camera were on the same horizontal plane.
Distance between the smart phone cradle and drop = 4 cm
Placing Samples onto the Fluorimeter
A slide was positioned on the fluorimeter
80 microliters of Sybr Green were added between two of the rows on the slide
80 microliters of the DNA sample were added
A three second timer was set on the phone and a picture was taken
Two more pictures were taken for each DNA sample
The 160 microliters of Sybr Green and DNA sample were removed from the test tube using the micropipette
The slide was moved so the next two rows were in line with the light
Steps 2-7 were repeated until all DNA samples had been photographed three times
Data Collection and Analysis
Images of High, Low, and Zero Calf Thymus DNA
(1) 5 μg/mL sample
(2) 0.5 μg/mL sample
(3) zero DNA
Calibrator Mean Values
Initial Concentration of 2X Calf Thymus DNA solution (micrograms/mL)
Final DNA concentration in SYBR Green I solution (µg/mL)
Sample Number
RAWINTDEN DROP - BACKGROUND
RAWINTDEN DROP - BACKGROUND
RAWINTDEN DROP - BACKGROUND
MEAN
Standard Deviation
Image 1
Image 2
Image 3
5
2.5
C-1
7695436
8778810
8648377
8374207.66666667
591440.126702892
2
1
C-2
9976618
10139271
10217875
10111254.6666667
123044.387163061
1
0.5
C-3
5960300
5976139
6315199
6083879.33333333
200485.185538317
0.5
0.25
C-4
5413972
5865862
5191720
5490518
343527.766895196
0.25
0.125
C-5
4962662
5351433
5223847
5179314
198174.452634541
0
0
C-6
2767243
3014607
82822
1954890.66666667
1625969.88184294
Calibration curves
Images of Our PCR Negative and Positive Controls
(1) G6- Control
(2) G6+ Control
PCR Results: PCR concentrations solved
PCR Product TUBE LABEL
MEAN (of RAWINTDEN DROP _ BACKGROUND
PCR Product Concentration (µg /mL)
(Step 5 calculation)
"Total Dilution
"Initial PCR Product Concentration
(µg /mL)
(Step 6 calculation)
(Step 6 calculation)"
G6+
6588265
1.588265
12
19.05918
G6-
5219016.6667
0.21901667
12
2.6282
G6 1-1
6623092
1.623092
12
19.477104
G6 1-2
3326347.333
1.673652667
12
20.083832004
G6 1-3
3174961.333
1.825038667
12
21.900464004
G6 2-1
9316279
4.316279
12
51.795348
G6 2-2
9177447
4.177447
12
50.129364
G6 2-3
8846335.6667
3.8463356667
12
46.1560280004
PCR Results: Summary
Our positive control PCR result was 19.05918 μg/mL
Our negative control PCR result was 2.6282 μg/mL
Observed results
Patient 41418 : The photos for this patient show green drops. The average concentration was 20.48713334 μg/mL.
Patient 39567: The photos for this patient show clear drops. The average concentration was 49.36024667 μg/mL.
Conclusions
Patient 41418 : This patient matches the positive photo. The average of this patient is very close to the positive control, supporting that the SNP is present in this patient's DNA.
Patient 39567 : This patient matches the negative photo. However, the concentration of this patient is closer to the positive control concentration than the negative control concentration. Visually, the patient is negative but quantitatively, the patient is positive. These results are inconclusive and a retest would be advised.