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Epigenetic causes of prostate cancer
Date:9/5/2012

This press release is available in German.

In about half of all prostate tumours, there are two genetic areas that are fused with one another. When this is not the case, the exact way cancer cells originate in prostate tumours was not clear until now. Scientists at the Max Planck Institute for Molecular Genetics in Berlin, in cooperation with a team of international researchers, were able to show that the genesis of this fusion-negative prostate cancer has epigenetic causes: methyl groups are distributed differently over the DNA in the cancer cells than in healthy cells. Thanks to this knowledge, physicians may be able to achieve greater specificity in treating prostate tumours in future. In addition, the aberrant DNA methylations can be used as a potential biomarker for identifying prostate cancer.

About half of all cases of prostate cancer originate through fusion of two genetic areas. As a result, the ERG gene is activated in these fusion-positive cells and prostate cells propagate, leading to tumourigenesis. Fusion-positive prostate cancer can be treated with PARP1 inhibitors that turn off the repair system of the tumour cells.

However, it has not been clear how prostate tumours without a fused ERG gene acquire their tumourigenic potential. Now, a team of Max Planck scientists headed by Michal-Ruth Schweiger from the Department of Vertebrate Genomics have investigated the global DNA methylation pattern i.e. at which locations the DNA possesses methyl groups in fusion-negative tumours. They have discovered that, compared to fusion-positive tumours, the fusion-negative tumours display more aberrant DNA methylations, which are most likely causative for the malignant transformation of prostate cells.

Moreover, the scientists found large amounts of the enzyme EZH2 in the cells of the tumours. This histone methyltransferase couples
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Contact: Dr. Michal-Ruth Schweiger
mschweig@molgen.mpg.de
49-308-413-1339
Max-Planck-Gesellschaft
Source:Eurekalert

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