MadSci Network: General Biology |
Caitlin, These are some very impressive experiments you’ve suggested. I’m sorry to say that I can’t think of many techniques available to you that would test for DNA damage. Even in a research lab, testing for DNA damage can be a complex proposition. For instance, one technique involves using antibodies prepared against proteins known to be involved in the repair of DNA damage. Scientists then apply these antibodies to cells or tissues they suspect could have DNA damage, and look to see if the proteins of interest are clustered at specific spots inside the nucleus; this indicates that places where the DNA is damaged are surrounded by repair proteins. Unfortunately an experiment like this would require equipment that a high school biology lab simply doesn’t possess, including a fluorescent microscope, antibodies to these proteins, and equipment required for cell culture. Other experiments that specifically look for DNA damage are even more costly and highly specialized – so much so that even large research labs must share the cost of this equipment. If you have an interest in performing a project that requires intensive biochemistry or molecular biology, I suggest that you look at the faculty page for the nearest university/college’s biology department and contact a professor that works on something that interests you. Given its prominent role in cancer and other disease states, DNA damage is a pretty commonly investigated phenomenon, and you’d be surprised at how willing many professors are to help high school students cultivate an interest in biological research. I’m sorry I couldn’t help you further, but good luck in your future endeavors! Billy. PS – I’ve included some links to pages that might be of interest to you – check out the technical literature if you’re interested, and also check out the prices…you might understand why high schools don’t invest more in advanced scientific tools. This is a system that stains cells in culture for H2AX, which is a protein that responds to and co-localizes with a break in both strands of DNA, or a “double-stranded” break. http://www.activemotif. com/catalog/178.html A comet assay is a really simple (yes still costly and difficult to analyze) experiment that helps scientists analyze a single cell’s DNA stability. It works by breaking up all of the molecules in a cell except for the DNA, then using an electric field to push draw the DNA away from where the cell was. DNA that is intact is large and difficult to move using an electric field, but DNA that has been fragmented can be moved, leaving a “comet tail” as it moves…the longer and brighter the tail, the more DNA damage. http://www.bioreliance. com/comet_assay.html http://en.wikipedia.org/wi ki/Comet_assay
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