BME103:T930 Group 12 l2
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Thermal Cycler Engineering
Our re-design is based upon the Open PCR system originally designed by Josh Perfetto and Tito Jankowski.<
Our design manipulates the 4x4 PCR Tube Block to a 3x7 block capable of holding 21 DNA sample spaces instead of the generic 16. One of the 21 test tube spaces will be inserted with a platinum temperature sensor. The platinum temperature sensor reads the temperature more accurately, and since it reads the temperature more accurately it saves more time.
Research and Development
Background on Disease Markers
We decided to research and to design primers that will help detect a specific SNP that causes Alzheimer’s disease. Alzheimer’s disease is a form of dementia that affects one in eight older Americans and is the sixth-leading cause of death in the United States (http://www.alz.org/alzheimers_disease_facts_and_figures.asp). It is usually present in people of 65 years of age and older, and causes cognitive deterioration ranging in severity and rate. The average person diagnosed with Alzheimer’s disease lives around 8 to 12 years after diagnoses (http://www.agingcare.com/Answers/How-long-does-Alzheimer-s-disease-last-on-average-133298.htm).
One of the SNP’s (single nucleotide polymorphism) associated with Alzheimer’s is Rs4934, located in chromosome 14, at position # 95,080,803. This missense mutation causes an allele change of GCT ⇒ ACT and is associated with the gene SERPINA3. People with this mutation have a 2.5x increased risk of Alzheimer’s and decreased age at onset (http://www.snpedia.com/index.php/Rs4934(A;A). There was no information pertaining to Rs4934 present in the OMIM database.
Primer Design Surrounding sequence of Rs4934: 5' GAATGGAGAGAATGTTACCTCTCCTG[A/G]CTCTGGGGCTCTTGGCGGCTGGGTT 3’ 3’ CTTACCTCTCTTACAATGGAGAGGAC[T/C]GAGACCCCGAGAACCGCCGACCCAA 5’ Forward Primer: 3’TGGAGAGGACCGAGACCCCG5’ Reverse Primer (150 basepairs to the left): 5’TGAGGGAGGCTCCAAAGCTA3’ The specific disease allele for Rs4934 will give a positive result and a non-disease will not because, the forward and reverse primers were designed to only attach to DNA strands with the GCT ⇒ ACT mutation at position # 95,080,803. Exponential replication will only occur in the strands of which the primers bind to. Because the non-disease allele strands will have a mismatching nucleotide with the primers,(a G instead of C at position # 95,080,803), the primers will not bind to them, making exponential replication impossible.