BME103:T930 Group 16: Difference between revisions
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Next we began analyzing the samples by creating another solution that would allow positive samples for cancer to glow. <br> | Next we began analyzing the samples by creating another solution that would allow positive samples for cancer to glow. <br> | ||
1. We labeled ten transfer pipettes: one with a blue dash for our SYBR green solution, 1 with a red dot for our DNA Calf thymus, a positive control, negative control, 3 for our first patient and the last three for our second patient (The labeling was important so that we would avoid cross-contamination which could heavily skew our results) <br> | 1. We labeled ten transfer pipettes: one with a blue dash for our SYBR green solution, 1 with a red dot for our DNA Calf thymus, a positive control, negative control, 3 for our first patient and the last three for our second patient (The labeling was important so that we would avoid cross-contamination which could heavily skew our results) <br> | ||
2. | 2. Put two drops of SYBR green on the sample slate <br> | ||
3. | 3. Then add two drops of the positive control to the SYBR green. <br> | ||
4. Next | 4. Next align the light so that it hits the sample <br> | ||
5. | 5. Place the sample under the the black box <br> | ||
6. Take the picture using a smart phone <br> | |||
7. Recorded whether or not it was able to glow <br> | |||
8. Remove the liquid from the slide and discard it along with the pipette <br> | |||
9.We followed the same procedure (steps 2-8) using the corresponding pipettes for each of the remaining patient samples, our water sample and our sample of DNA Calf Thymus <br> | |||
We recorded the samples' ability to glow based on the pictures to determine which samples were positive for the cancer gene that we amplified (or copied) with the open PCR machine. <br> | |||
A picture of the fluorimeter assembly was taken with a smartphone, and then the picture was transferred to a laptop equipped with the ImageJ software via icloud or email. The file was converted to a tiff, and then import in the ImageJ options was selected to obtain the TIFF virtual stack. The image was found in the search box, and then was ready to be analyzed. | |||
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Revision as of 14:19, 13 November 2012
BME 103 Fall 2012 | Home People Lab Write-Up 1 Lab Write-Up 2 Lab Write-Up 3 Course Logistics For Instructors Photos Wiki Editing Help | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
Group 16LAB 1 WRITE-UPInitial Machine Testing
When the heat sink is unplugged from the circuit board, the LCD screen is turned off. When we unplugged the white wire that connected the circuit board to the heating block the temperature reading on the LCD screen dropped drastically. Test Run We first tested open PCR on October 18, 2012. We learned how to take accurate temperatures using the open PCR machine. Using open PCR we were able to make a polymerase chain reaction. In order for this to occur, open PCR had to send the DNA through different sets of temperatures to heat it up to separate the strands and expose the bases, then cool it down for the primers to bind to the sequences, and also heat it back up to attain an extension of the copy of the new DNA. Which was conducted in an hour and thirty minutes.
ProtocolsPolymerase Chain Reaction Sample Procedures To use the PCR machine we first obtained two patient DNA samples. Then we labeled eight test tubes with the patient number (three test tubes were labeled with patient one and the three others were labeled for patient two's DNA) and the last two were labeled as our positive or negative control. Once the tubes were labeled, we transferred the DNA using pipettes into the corresponding tube that contained solution which would allow the DNA to be copied. This solution was a mixture of Taq DNA polymerase, MgCl2, dNTP's, forward primer and reverse primer. The Taq DNA polymerase is an enzyme that helps to catalyze the matching of the dNTP's (or floating nucleotides) to make copies of the original DNA strand; the MgCl2 helps the Taq be more efficient. After the samples and controls were prepared, we placed the tubes in the open PCR machine and set the correct cycles and temperatures for the DNA to copied. This process took about an hour and a half to complete. Our samples were then collected and incubated until we received them again about two weeks later. Fluorimeter Procedures Next we began analyzing the samples by creating another solution that would allow positive samples for cancer to glow.
Here is the patient information:
Fluorimeter Measurements
Research and DevelopmentSpecific Cancer Marker Detection - The Underlying Technology A Polymerase chain reaction is a machine that amplifies a single or a few strands of DNA to generate millions of copies of that DNA sequence. Using this technology scientists can determine whether a patient has a positive or negative result towards cancer. A method of getting this data is called the PCR detection method, a method that relies on thermal cycling, switching back and forth to melt DNA and then connect primers. This is a method that can be used to detect whether a patient has positive result for cancer, because a sample of DNA can be taken and whether that connects to the primers and creates a chain reaction, scientists can then determine whether this DNA is positive or negative towards cancer. An example of proving this method can be seen using the r17879961 SNP, a cancer-associated sequence, using the PCR detection method we can prove that r17879961 SNP is actually associated with cancer. Because it carries with the Polymerase chain reaction, and to further prove the patient has a positive result for cancer, we use fluorescent dye and if the DNA glows in the solution, then the results are positive for cancer. (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.)
==Results==
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