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MicroRNA network study implicates rewired interactions in cancer
Date:5/2/2010

g groups of miRNAs exhibiting highly related patterns of expression. Once relationships were recognized, they could then build a genetic network revealing the most highly connected miRNAs, called "hubs."

When comparing the miRNA networks built from normal tissues to the networks built from tumor samples, Croce's team found cases where the miRNA networks have been reprogrammed in cancer. In some cases, they found that the highly connected miRNA hubs changed between cancer and normal tissues.

They also identified even more extreme cases of tumor network changes. "Groups of miRNAs go awry and exit from the 'social network' altogether," Croce said. "In solid cancers there can be a few, or more, groups of such misbehaved miRNAs, while in leukemias we found only one or two." Some of these "unsocial" miRNAs have well-known roles in cancer, but others had not been implicated until now.

This work is particularly significant in that novel cancer genes have been discovered utilizing a strategy based on relationships, rather than up or down regulation of expression. "The miRNAs we discovered can now be used as targets for drug development," Croce added, "or to pinpoint candidate proteins, which, in turn, they regulate."


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Contact: Peggy Calicchia
calicchi@cshl.edu
516-422-4012
Cold Spring Harbor Laboratory
Source:Eurekalert

Page: 1 2

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