BME103:T130 Group 5 l2: Difference between revisions
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'''System Design'''<br> [[Image:BME103_group5_wells.jpg|350px]] | '''System Design'''<br> [[Image:BME103_group5_wells.jpg|350px]] | ||
<br> Eight wells were added, this is a good amount to increase sample size significantly yet not too drastic of a change that will affect the size by making it too large.<br> | |||
[[Image:openpcrlid.png|350px]]<br> | |||
The additional wells will also slightly elongate the lid. | |||
'''Key Features'''<br> The major change of the PCR machine was that eight extra wells were added to increase the sample size from 16 to 24. With the addition of the extra wells, the machine will be able to run more samples. This also affects the size as the additional wells will cause it to be longer than the original design. | |||
'''Key Features'''<br> The major change of the PCR machine was that eight extra wells were added to increase the sample size from 16 to 24. With the addition of the extra wells, the machine will be able to run more samples. | |||
'''Instructions'''<br> | '''Instructions'''<br> | ||
The instructions for assembling the PCR machine will mostly stay the same the only difference will be that the screws will be located in a slightly different place than the original design. | |||
<!--- From Week 4 exercise ---> | <!--- From Week 4 exercise ---> | ||
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'''PCR Protocol''' | '''PCR Protocol''' | ||
# Using a pipette, transfer 1.0-1.5 micro liters of the DNA sample into the desired number of test tubes. | |||
# Pipette approximately 3 micro liters of reagent solution into each of the test tubes with the DNA. | |||
# Invert tubes, then turn upright to mix solution. | |||
# Plug in OpenPCR Machine and turn it on. | |||
# Open lid and place tubes into holder in PCR machine (the machine can now hold a maximum of 24 test tubes). | |||
# Close the lid. | |||
# Add the following cycles on the OpenPCR program: | |||
## Stage 1: 1 cycle, 95 degrees Celsius for 3 minutes | |||
## Stage 2: 30 cycles, 95 degrees for 30 seconds, 57 degrees for 30 seconds, 72 degrees for 30 second | |||
## Stage 3: 72 degrees for 3 minutes | |||
## Hold: 4 degrees | |||
# Run reaction. | |||
# After the program is complete, open the lid and remove samples for further analysis. | |||
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''Photo origin: http://openwetware.org/wiki/BME103:T130_Group_9 '' | ''Photo origin: http://openwetware.org/wiki/BME103:T130_Group_9 '' | ||
<!--- To save an image: | |||
# After taking all pictures with the SmartPhone, upload them to a computer using either an USB cord or via text messaging. | # After taking all pictures with the SmartPhone, upload them to a computer using either an USB cord or via text messaging. | ||
# Open the photographs using any basic photography program on the computer. If the files are not already in the .jpg format, convert them. | # Open the photographs using any basic photography program on the computer. If the files are not already in the .jpg format, convert them. | ||
# Labeling all photographs, open the OpenWetWare program and select "Upload file". | # Labeling all photographs, open the OpenWetWare program and select "Upload file". | ||
# Select desired images and upload them to the wiki, taking note of their file names. | # Select desired images and upload them to the wiki, taking note of their file names. | ||
# Select "edit" on the desired page, and insert the photograph on the page by inserting its file name. | # Select "edit" on the desired page, and insert the photograph on the page by inserting its file name. ---> | ||
[[Image: | [[Image:Positive.jpg|100px|thumb|Positive Result]] | ||
[[Image: | [[Image:Negative.jpg|100px|thumb|Negative Result]] | ||
==Research and Development== | ==Research and Development== | ||
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<!--- Include an illustration that shows how your system's primers allow specific amplification of the disease-related SNP ---> | <!--- Include an illustration that shows how your system's primers allow specific amplification of the disease-related SNP ---> | ||
[[Image:]] | [[Image:pcrcopies.gif]] | ||
The wanted gene in the figure above refers to rs1466662. | |||
Photo courtesy of http://users.ugent.be/~avierstr/principles/pcr.html | |||
<!-- ##### DO NOT edit below this line unless you know what you are doing. ##### --> | <!-- ##### DO NOT edit below this line unless you know what you are doing. ##### --> |
Latest revision as of 09:33, 29 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 | |||||||||||||||||||||||||||||||||||
OUR TEAMLAB 2 WRITE-UPThermal Cycler EngineeringOur re-design is based upon the Open PCR system originally designed by Josh Perfetto and Tito Jankowski.
Key Features
Instructions
ProtocolsMaterials
PCR Protocol
Photo origin: http://openwetware.org/wiki/BME103:T130_Group_9
Research and DevelopmentBayesian statistics
A=Alzheimer's B=Positive test Result [math]\displaystyle{ P(A/B)=P(B/A)P(A)/P(B) }[/math]
Background on Disease Markers Alzheimer's disease is a form of dementia that occurs with loss of brain function. It affects multiple areas of the brain associated with memory, language, personality, perception, and cognitive skills. The disease typically manifests itself through forgetfulness, but gradually progresses to inability to perform basic functions, speak, and recognize family members. Currently, there is no cure. Treatment tries to slow down the disease or at the least, manage symptoms. An SNP related to Alzheimer's disease is rs1466662 (http://www.ncbi.nlm.nih.gov/projects/SNP/snp_ref.cgi?rs=1466662). It is located on chromosome four, the intron region of NM_001142552.1 and arises from a missense mutation replacing an A with a T. It is the most significant SNP outside of the SNP linked to APOE.
The backwards primer is TAT TTT TAG AAG CGA TAA AA. The forwards primer is GCC TCT TTG CCC TCT GTT TT. An allele not containing the disease will not have the sequence that allows the primers to bind. If the primers cannot bind, then that means Taq polymerase does not know where to bind. If Taq polymerase does not bind, then the sequence does not get replicated. Therefore, there will be no PCR product. Conversely, if the disease allele is present, the primers will bind. Taq polymerase will then be able to bind to the DNA and replicate the strands, creating more double-stranded DNA yielding a PCR product.
The wanted gene in the figure above refers to rs1466662. Photo courtesy of http://users.ugent.be/~avierstr/principles/pcr.html
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