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It's a trap! New laboratory technique captures microRNA targets
Date:5/9/2012

LA JOLLA, Calif., May 9, 2012 Human cells are thought to produce thousands of different microRNAs (miRNAs)small pieces of genetic material that help determine which genes are turned on or off at a given time. miRNAs are an important part of normal cellular function, but they can also contribute to human diseasesome are elevated in certain tumors, for example, where they promote cell survival. But to better understand how miRNAs influence health and disease, researchers first need to know which miRNAs are acting upon which genesa big challenge considering their sheer number and the fact that each single miRNA can regulate hundreds of target genes. Enter miR-TRAP, a new easy-to-use method to directly identify miRNA targets in cells. This technique, developed by Tariq Rana, Ph.D., professor and program director at Sanford-Burnham Medical Research Institute (Sanford-Burnham), and his team, was first revealed in a paper published May 8 by the journal Angewandte Chemie International Edition.

"This method could be widely used to discover miRNA targets in any number of disease models, under physiological conditions," Rana said. "miR-TRAP will help bridge a gap in the RNA field, allowing researchers to better understand diseases like cancer and target their genetic underpinnings to develop new diagnostics and therapeutics. This will become especially important as new high-throughput RNA sequencing technologies increase the numbers of known miRNAs and their targets."

How miR-TRAP works

miRNAs block gene expression not by attaching directly to the DNA itself, but by binding to messenger RNA (mRNA), the type that normally carries a DNA recipe out of the nucleus and into the cytoplasm, where the sequence is translated into protein. Next, these RNAs are bound by a group of proteins called the RNA-induced silencing complex, or RISC. This blocks production of the protein encoded by that mRNA, an action that can have far-reaching c
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Contact: Heather Buschman, Ph.D.
hbuschman@sanfordburnham.org
858-795-5343
Sanford-Burnham Medical Research Institute
Source:Eurekalert  

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