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Team:Davidson-MissouriW/CreLox
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<p>In order to randomly "select objects" for the knapsack problem, we used the Cre-lox recombination method of excision and inversion. We needed a set of variant lox sites in order to create constructs that would yield different subsets of survival and fluorescence to optimally fill the knapsack. These variant lox sites have mutations specific to the 8bp spacer region and do not recombine. We designed five different construct models as potential tools for solving the knapsack problem in bacteria. These constructs include various lox sites, a reporter fluorescent protein, and a TetA gene that has an upper and lower threshold of expression in order to survive.</p> | <p>In order to randomly "select objects" for the knapsack problem, we used the Cre-lox recombination method of excision and inversion. We needed a set of variant lox sites in order to create constructs that would yield different subsets of survival and fluorescence to optimally fill the knapsack. These variant lox sites have mutations specific to the 8bp spacer region and do not recombine. We designed five different construct models as potential tools for solving the knapsack problem in bacteria. These constructs include various lox sites, a reporter fluorescent protein, and a TetA gene that has an upper and lower threshold of expression in order to survive.</p> | ||
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We created 10 new lox sites with mutations in the 8 bp region: loxN Forward and Reverse, loxm2 Forward and Reverse, lox2272 Forward and Reverse, lox5171 Forward and Reverse, and loxBri Forward and Reverse. In addition, we added the wildtype loxP Reverse to the registry. </p> | We created 10 new lox sites with mutations in the 8 bp region: loxN Forward and Reverse, loxm2 Forward and Reverse, lox2272 Forward and Reverse, lox5171 Forward and Reverse, and loxBri Forward and Reverse. In addition, we added the wildtype loxP Reverse to the registry. </p> | ||
Revision as of 13:28, 28 July 2010
Characterizing Cre/lox Recombination Method
Mechanism behind Cre/lox Recombination
The Cre-lox tool is a site-specific recombination system that is widely used in biological research to manipulate DNA. It was discovered in the early 90's through characterization of coliphage P1 recombination system. The Cre recombinase enzyme, a 38kDa protein, catalyzes the recombination of DNA between two lox sites. These lox sites, each 34 bp long, consist of two inverted repeat arms flanking a spacer region of 8bp that is unique to the lox site.
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Designing Lox Sites
In order to randomly "select objects" for the knapsack problem, we used the Cre-lox recombination method of excision and inversion. We needed a set of variant lox sites in order to create constructs that would yield different subsets of survival and fluorescence to optimally fill the knapsack. These variant lox sites have mutations specific to the 8bp spacer region and do not recombine. We designed five different construct models as potential tools for solving the knapsack problem in bacteria. These constructs include various lox sites, a reporter fluorescent protein, and a TetA gene that has an upper and lower threshold of expression in order to survive.
We created 10 new lox sites with mutations in the 8 bp region: loxN Forward and Reverse, loxm2 Forward and Reverse, lox2272 Forward and Reverse, lox5171 Forward and Reverse, and loxBri Forward and Reverse. In addition, we added the wildtype loxP Reverse to the registry.
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We floxed red fluorescent protein with these variant lox sites using 16 out of the 21 combinations of the 5 lox forward variants to see immediately if recombination occurred in the presence of Cre. These constructs below follow a moderate promoter, pTet.
