Difference between revisions of "BME103:T930 Group 10"

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[[Image:BME103_Group10_‎IMAG0686.jpg|200px|Light leaking from the non-DNA water droplet]]
[[Image:BME103_Group10_‎IMAG0686.jpg|200px|Light leaking from the non-DNA water droplet]]
[[Image:BME103_Group10_‎IMAG0687.jpg|200px|Light arcs through a water droplet on a super hydrophobic surface]]
[[Image:BME103_Group10_‎IMAG0687.jpg|200px|Light arcs through a water droplet on a super hydrophobic surface]]
[[Image:90 Degrees.JPG|250px|Positive Result]]

Revision as of 17:33, 13 November 2012

Owwnotebook icon.png BME 103 Fall 2012 Home
Lab Write-Up 1
Lab Write-Up 2
Lab Write-Up 3
Course Logistics For Instructors
Wiki Editing Help
BME494 Asu logo.png


Name: Nolan Bidese
Role: Research and Development Specialist
Name: Evan Austin
Role: Open PCR Machine Engineer
Name: Aldin Malkoc
Role: Open PCR Machine Engineer
Name: Mikayle Holm
Role: Experimental Protocol Planner
Name: Coleen Fox
Role: Experimental Protocol Planner


Initial Machine Testing

The Original Design
3D CAD image of Open PCR Machine

A PCR machine is a device that replicates DNA segments by performing polymerase chain reactions. This is useful for purposes such as ours of cancer marker detection. Our PCR machine is a relatively simple and inexpensive machine that is portable and inexpensive. It can hold 16 DNA samples and is compatible with most computers and operating systems. As indicated by the cross section, our PCR machine is composed of few components and is designed for ease of use.

Experimenting With the Connections

When we unplug the circuit board from the mounting plate, the LED display on the PCR machine stopped functioning.

When we unplugged the white wire that connects the Open PCR circuit board to the heating plate, the temperature recordings that were displayed on the LED display stopped functioning.

Test Run

We first tested our PCR machine on October 23, 2012. Before testing, we attempted to take the PCR machine apart to gain a better understanding of how it works. Following the instructions, we examined individual components of the machine and unplugged special components to examine the effect. After unplugging the wire that connects the circuit board to the LED display, we were unable to plug the wire back in as some of the prongs to the metal adapter had bent. Thus, upon our initial test, we were able to test the machine and observe its changes through the computer display but we could not compare the changes to the LED Display on the PCR machine.


Polymerase Chain Reaction

Polymerase Chain Reaction (PCR) is a technique used to amplify fragments of DNA. This allows researchers to see the base sequence of the DNA. It works by the DNA polymerase enzyme synthesizes a complementary strand of the fragmented DNA when mixed with primers that signal where the DNA sequencing should begin. When the DNA polymerase enzyme, MgCL2, dNTP’s, forward primer, and reverse primers are all added to the test tubes and placed in the PCR machine, the mixture is first heated to separate the double helix, then cooled to allow the primers to bind. After the primers bind, the polymerase completes the new complementary strands. The PCR machine then repeats heating and cooling cycles to multiply the fragmented DNA. After a couple hours, the now amplified segments of DNA can be analyzed to test for a cancer marker.

1. Add a fragment of double stranded DNA, the pre-mixed Taq DNA polymerase, MgCl2, dNTPs, forward and reverse primers, and the DNA polymerase enzyme to test tube.
2. Place in PCR machine.
3. Set the following PCR cycle stages:
Stage 1: 1 cycle, 95 degrees Celsius for 180 seconds (separate the DNA double helix)
Stage 2: 30 cycles, 95 degrees Celsius for 30 seconds, 57 degrees Celsius for 30 seconds, 72 degrees Celsius for 30 seconds (separate the DNA double helix, primers bind to single strands of DNA at 57 degrees Celsius, DNA polymerase enzyme adds bases to singles strands of DNA segments at 72 degrees Celsius, cycle is repeated so the DNA is multiplied)
Stage 3: 72 degrees for 180 seconds (final nucleotides are added)
Final Hold: 4 degrees Celsius
4. Run the PCR machine.
5. After about 2 hours, the cycles should be completed. DNA can now be used for research and testing for a cancer marker.

The PCR (GoTaq) Master Mix is advertised as a “ready-to-use solution” and it contains the Taq DNA polymerase, dNTPs, MgCl2 and reaction buffers. These substances are mixed at proper concentrations so the user can achieve a useable amplification of DNA segments by PCR.

Reagent Volume
Template DNA (20 ng) 0.1μL
10μM forward primer 0.5μL
10μM reverse primer 0.5μL
GoTaq master mix 25.0μL
dH2O 23.9μL
Total Volume 50.0μL

Test tube 1-
Positive Control
Cancer DNA template

Test tube 2-
Patient 1
Replicate 1

Test tube 3-
Patient 1
Replicate 2

Test tube 4-
Patient 1
Replicate 3

Test tube 5-
Negative Control
DNA Template

Test tube 6-
Patient 2
Replicate 1

Test tube 7-
Patient 2
Replicate 2

Test tube 8-
Patient 2
Replicate 3

Patient Information

Patient Number Patient Identification Number Gender Age
1 30576 Male 46
2 96210 Male 59

Fluorimeter Measurements

Fluorimeter set up

Fluorimeter set up Procedure:
1. Number transfer pipettes to match Eppendorf tubes.
2. Transfer each separately into an Eppendorf tube containing 400ml of buffer. Label tube with matching sample number.
3. Take the specially labeled Eppendorf tube containing SYBR GREEN I and place two drops on the first two centered drops on slide, using the correct pipette.
4. Now take diluted sample and place two drops on top of the SYBR GREEN I drops.
5. Turn on fluorimeter. Align light to center of drops. Place smart phone next to slides on fluorimeter.
6. Let smartphone operator take pictures under light box.
7. Run this procedure for all 8 samples, including positive and negative controls. Also run with water from scintillation vial and the DNA from a calf thymus.
8. Record results with pictures.

First picture of the water droplet on a super hydrophobic surface with NO DNA SAMPLE Light leaking from the non-DNA water droplet Light arcs through a water droplet on a super hydrophobic surface

Image J Procedure:
1. Download the ImageJ software from the internet
2. Save the pictures to smart phone.
3. Download the pictures onto a computer that has Image J.
4. Open them with Image J by going to add image. Find image.
5. Change the picture:
a. Use the menu selections ANALYZE and select the functions SET MEASUREMENTS, AREA INTEGRATED DENSITY in addition to MEAN GREY VALUE
b. Then go through the menus IMAGE to COLOR to SPLIT CHANNELS. , this makes the one color image separate into 3 black and white images of =red=, =blue=, and =green=. Delete the red and blue pictures and mess with the green one.

Research and Development

Specific Cancer Marker Detection - The Underlying Technology

The DNA sequence r17879961 is the cancer-associated sequence for Colon Rectal Cancer. The goal of this experiment was to detect a cancer-associated sequence in a PCR machine and through the detection method. PCR stands for polymerase chain reaction, a method that uses DNA polymerase and primers, small sets of DNA, to amplify a sample of DNA to study and see specific sequences in it. Through thermal cycling, DNA sequences are melted apart from their complimentary base pairs and then cooled to allow primers to connect to the open DNA sequences. This process is repeated again and again to get many copies of the specific DNA strand. In this experiment, the reverse primers used will be in the sequence of AAACTCTTACACTGCATACA and that will accompany to the TTTGAGAATGTGACGTATGT which is the sequence of Colon rectal cancer that is being studied. This occurs on the 22nd chromosome and the misspent of the disease comes when the sequence AATGT has the T in the middle is changed to a C which is cancer associated and creates a Protein Change to occur. In this experiment, this sequence will be put in with the reverse primer sequence listed above. Through the PCR process, the primer will attach to the sequence and replicate the DNA sequence. If the cancer sequence is present, the primers will attach and replicate until there are numerous samples of the cancer sequence. If there is no cancer sequence present, the primers will not bond since the sequence will be different and the ending DNA sequence will be the same as the original sequence put in. This will provide a correct detection for the r17879961 SNP.

how primers bind to cancer DNA

Pray, Â Leslie A.. "The Biotechnology Revolution: PCR and Cloning Expressed Genes | Learn Science at Scitable." Nature Publishing Group : science journals, jobs, and information. N.p., n.d. Web. 13 Nov. 2012. <http://www.nature.com/scitable/topicpage/the-biotechnology-revolution-pcr-and-the-use-553>.

(BONUS points: Use a program like Powerpoint, Word, Illustrator, Microsoft Paint, etc. to illustrate how primers bind to the cancer DNA template, and how Taq polymerases amplify the DNA. Screen-captures from the OpenPCR tutorial might be useful. Be sure to credit the source if you borrow images.)