Name: Katelynn Maxwell Date: December 8, 2014
Abstract
The purpose of the PCR Technology experiment was to determine the size of each of our visible DNA fragments as well as approximating the amount of tandem repeats our DNA has. In order to determine all that did, we started by spitting in a tube and then spinning our cheek cells in a clinical centrifuge. Once the centrifuge was done spinning our cells, we placed them into a microfuge. Later, we put the microfuge into a boiling bath as well as ice. We obtained a PCR tube with a bead and then added contents to it and had it placed in a thermal cycler. We also created a ladder as well as positive and negative controls
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PCRs, or polymerase chain reactions, synthesis DNA strands complementary to a template strand (1). In order for a complete PCR reaction to take place, there are three steps that must take place. First, denaturation occurs. This means that the DNA is heated to 95°C in order to make it single-stranded. Next, annealing takes place, usually around 65°C. This is when two primers add to a complementary strand of DNA. Finally, primer extension occurs at 72°C. This is when DNA polymerase adds the enzyme Taq Polymerase to the primer by polymerase activity. The PCR steps are repeated about thirty times with each cycle taking approximately 5 minutes. Through PCRs, a small amount of DNA is able to be transformed into large amount of DNA in a short amount of time (2). The different machinery that we used included a thermal cycler, agarose gel electrophoresis and a transilluminator. A thermal cycler is the instrument that is used that gives us the exact temperatures needed to complete the PCR. The thermal cycler is able to be used in cloning, sequencing, analysis as well as genotyping (3). The agarose gel electrophoresis is a way …show more content…
2. McClean, Phillip. (1997). Cloning and molecular analysis of genes: Polymerase chain reaction (or PCR). Retrieved on December 6, 2014, from http://www.ndsu.edu/pubweb/~mcclean/plsc431/cloning/ clone9.htm.
3. Life Technologies. (2014). PCR thermal cyclers from applied biosystems. Retrieved on December 6, 2014, from http://www.lifetechnologies.com/us/en/home/life-science/pcr/thermal-cyclers-realtime- instruments/thermal-cyclers.html.
4. (n.d.). Agarose gel electrophoresis. Retrieved on December 6, 2014, from http://faculty.plattsburgh. edu/donald.slish/Electrophoresis.html.
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6. (December 1, 2014). Genetics home reference: Variable number tandem repeats. Retrieved on December 6, 2014, from http://ghr.nlm.nih.gov/glossary=variablenumbertandemrepeats.
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NaOH is then applied for cell lysis and the ‘unzipping’ of dsDNA to ssDNA. The ssDNA may then be used to isolate and replicate the PCR product through the use of PCR and site specific primers, using 2 specific primers to isolate both sides and ends of the mtDNA D.loop, multiple runs of PCR are taken to receive multiple copies of the PCR product. The following sequence primers are used to isolate the PCR
Also (5μl) of DNA template that extracted from stool samles was added then 1.5 μl of each type of Primers(forward and reverse)added to the master mix and then blend well using Exispin vortex centrifuge ,then this tubes would transferred to the Thermocycler machine, which has been programmed by the previous program for amplified of ITS1 region.The PCR products were electrophoresed in agarose gel and visualized on UV trans illuminator and then photographed using photo documentation .
A future experiment for site directed mutagenesis/PCR might involve a slightly increased amount of template DNA and primers in the PCR reaction or increased amount of PCR product that is being transformed, in case if the transformation of the plasmid did not work. Another possible change could be done to the PCR thermal cycles, by altering the denaturation and annealing temperatures to a reasonable degree. This is to ensure amplification of the desired plasmid DNA incorporating the desired mutation with accuracy at the appropriate locations within the DNA template. A future experiment for protein expression and purification should be done with further precision. And more care needs to be taken as to include all necessary antibiotics during transformation and expression, depending on the type of plasmids used in the experiment. This is essential to obtain the desired protein containing the appropriate genes to procced with further
PCR is a tool used by those looking to amplify small amounts of DNA for identification purposes. Thermus Aquaticus’ main use is within this DNA amplification process (PCR) is its reproduction enzyme. The bacterium’s polymerase, called taq polymerase (name after the bacterium), is used to reproduce
In addition, one PCR condition will be varied to determine its affect on amplification, and which conditions are optimal for PCR amplification [1]. This particular part of the experiment brings into light the optimal conditions for PCR, as well as, strengthening understanding of amplification with PCR.
It is used to amplify a sample of DNA, creating thousands or even millions of copies of a certain sequence of DNA. "The story of modern PCR begins in 1976 with the isolation of Taq polymerase from the thermophilic bacterium Thermus aquaticus" (https://www.thermofisher.com/uk/en/home/brands/thermo-scientific/molecular-biology/molecular-biology-learning-center/molecular-biology-resource-library/spotlight-articles/history-pcr.html).
The process of PCR has 3 steps that repeat in cycles shown in image 1. The first one is the separation of the two strands of the DNA molecule. This happens by the initial material being heated to 95 °C. Every DNA
In the PCR based technique the time required to analyze a sample was significantly reduced (Weber and May 388). The major advantage of PCR is that it imitates the process of DNA replication, but limits it to specific DNA sequences of interest. In order for this process to occur, two primers, an enzyme DNA polymerase, excess of the four deoxyribonucleotide triphosphates, and a template DNA should be present. Several cycles of three major steps have to take place to produce the amplification. These steps are: DNA denaturation, primer annealing, and primer
Synthesis of the new DNA strand continues until one of these analogs is incorporated, at which time the strand is prematurely truncated. Each PCR reaction will end up containing a mixture of different lengths of DNA strands, all ending with the nucleotide that was dideoxy labeled for that reaction.
Polymerase Chain Reaction is a lab technique used to amplify DNA sequences. This lab involves using a small sample of genetic material we obtained from our cheek cells and amplifying that segment of DNA so you can determine if you are a homozygous, heterozygous, or non taster of phenylthiocarbamide(PTC) . I think I am a homozygous recessive nontaster AVI-AVI because I didn’t taste anything when tasting the PTC paper. Part one of this lab was DNA isolation. I got each tube needed along with a paper cup and labeled them with my initials. The first thing I did in this lab was obtain cheek cells. I did this by swishing 10mL of a saline solution in my mouth for 30 seconds. After spitting it in the cup, I used a micropipette to transfer 1000 microliters to a 1.5 mL microcentrifuge tube.
Polymerase chain reaction (PCR) is a technique used in making multiple copies of DNA segment. The director of the Australian Museum mention that Polymerase Chain Reaction (PCR) was a very important step in producing adequate amounts of Tasmanian Tiger DNA in order to proceed the research and complete the cloning project (Research of the Australian Thylacine N.D). Furthermore Geneticists working for the Australian Museum had successfully replicated Thylacine DNA by using this process.
The polymerase chain reaction or PCR for short can be used to create many copies of DNA. This allows the DNA to then be visualized using a dye like ethidium bromide after gel electrophoresis. The process has been refined over the years, however the basic steps are similar.
DNA is isolated from the blood sample and amplified through the polymerase chain reaction (PCR), a technique for rapidly producing,
Once my DNA has been sent to a lab for analysis, a sequencing method can be used to tell me what my DNA sequence is. Because there is the potential for the sample that I sent to not have a great deal of DNA available, polymerase chain reaction may be used to amplify the DNA to get a better sample to analyze. In polymerase chain reaction, they will take the small sample of DNA that I have provided along with two oligonucleotide primers, Taq polymerase, and four deoxynucleotide triphosphate and amplify the sample of DNA. In the first step, the DNA is heated to 95 degrees Celsius in order for the two strands of DNA to separate from each other. After the solution has cooled down to 54 degrees Celsius, short DNA primers hybridize to the DNA. Finally, after raising the temperature to 72 degrees
One of the newest of DNA testing methods is know as the Short Tandem Repeat method. What is it? Well, The human genome consists of fixed and repeated DNA sequences. The repeated sequences come in different lengths and are categorized by their corresponding length of the base repeating parts, meaning the amount of adjoining repeat units, and overall length of the repeat piece. The DNA regions with short repeat units, usually 2 to 6 bp units in length are known as Short Tandem Repeats or STR. STRs are found covering the inside of the chromosomal structure. STRs have numerous benefits that make them great for human identification.