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New technique sheds light on RNA
Date:1/28/2013

ANN ARBOR, Mich. When researchers sequence the RNA of cancer cells, they can compare it to normal cells and see where there is more RNA. That can help lead them to the gene or protein that might be triggering the cancer.

But other than spotting a few known instigators, what does it mean? Is there more RNA because it's synthesizing too quickly or because it's not degrading fast enough? What part of the biological equilibrium is off?

After more than a decade of work, researchers at the University of Michigan Comprehensive Cancer Center have developed a technique to help answer those questions.

The method involves a compound called bromouridine, which can be used to tag or label newly created RNA. Researchers apply the bromouridine for 30 minutes then isolate the RNA to see where the new RNA was made. They call this process Bru-Seq.

On the other hand, the researchers can follow up the bromouridine labeling with a rinse with the chemical uridine for different periods of time. They call this BruChase-Seq because the uridine chases away the newly made RNA so they can look at how the RNA ages over the course of one hour, two hours or six hours. In other words, is the RNA degrading like it's supposed to?

"We can see the whole pattern of all the RNA that's synthesized and all the RNA that's stable vs. degrading. We can sort it out in terms of synthesis and stability and see if a particular RNA is more stable in the cancer cell than the normal cell or if it is taking longer to degrade in the cancer cell than in the normal cell," says study author Mats Ljungman, Ph.D., associate professor of radiation oncology at the U-M Medical School.

"With our technique, we're adding 10-fold more depth to the picture of how genes are expressed," he adds.

Ljungman is part of the Cancer Center's new Translational Oncology Program, which brings together cancer researchers from across the University of Michigan to speed the
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Contact: Nicole Fawcett
nfawcett@umich.edu
734-764-2220
University of Michigan Health System
Source:Eurekalert

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