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Scientists unravel role of fusion gene in prostate cancer
Date:5/22/2012

NEW YORK (May 22, 2012) -- Up to half of all prostate cancer cells have a chromosomal rearrangement that results in a new "fusion" gene and formation of its unique protein -- but no one has known how that alteration promotes cancer growth. Now, Weill Cornell Medical College researchers have found that in these cancer cells, the 3-D architecture of DNA, wrapped up in a little ball known as a chromatin, is warped in such a way that a switch has been thrown on thousands of genes, turning them on or off to promote abnormal, unchecked growth. Researchers also found that new chromosomal translocations form, further destabilizing the genome.

These findings, published in the Proceedings of the National Academy of Sciences (PNAS), are the first to show how this chromosomal mutation likely contributes to early development of prostate cancer -- and suggests a model for how other chromosomal translocations, common to many tumor types, are linked to cancer formation and growth.

"This is likely a phenomenon that occurs in many types of cancers when oncogenic fusion genes are over-expressed," says the study's senior author, Dr. Mark A. Rubin, The Homer T. Hirst Professor of Oncology in Pathology and vice chair for experimental pathology at Weill Cornell Medical College.

Dr. Rubin adds that if such an oncogenic protein has the power to throw the switch on thousands of genes, a novel treatment may be able to turn that switch off. "If we understand how this works, then we may be able to borrow that trick to target many genes simultaneously. This discovery would hold a lot of promise for cancer therapy," he says.

The study also adds to the growing understanding of how remodeling of the chromatin regulates genes linked to cancer, says the study's lead author, Dr. David S. Rickman, assistant professor of pathology and laboratory medicine at Weill Cornell Medical College. The genome's DNA, along with specialized proteins, has to be packed
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Contact: Lauren Woods
law2014@med.cornell.edu
212-821-0560
New York- Presbyterian Hospital/Weill Cornell Medical Center/Weill Cornell Medical College
Source:Eurekalert

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