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Protein paves the way for correct stem cell differentiation
Date:2/7/2013

A single embryonic stem cell can develop into more than 200 specialized cell types that make up our body. This maturation process is called differentiation and is tightly regulated. If the regulation is lost, specialized cells cannot develop correctly during development. In adulthood, the specialized cells may forget their identity and develop into cancer cells. Research from BRIC, University of Copenhagen, has identified a crucial role of the molecule Fbxl10 in differentiation of embryonic stem cells and suggests the molecule as a new potential target for cancer therapy.

"Our new results show that this molecule is required for the function of one of the most important molecular switches that constantly regulates the activity of our genes. If Fbxl10 is not present in embryonic stem cells, the cells cannot differentiate properly and this can lead to developmental defects", says Professor Kristian Helin, who heads the research group behind the new findings.

Fbxl10 recruits and activates genetic switches

The Polycomb protein complexes PRC1 and PRC2 are some of the most important genetics switches, which control the fate of individual cells through negative regulation of gene activity. The mechanism by which PRCs are recruited to DNA has been elusive as they are not capable of binding DNA directly. The new results from the Helin research group provide a mechanism for how the PRCs are recruited to the genes that are to be silent.

"Our results show that Fbxl10 is essential for recruiting PRC1 to genes that are to be silenced in embryonic stem cells. Fbxl10 binds directly to DNA and to PRC1, and this way it serves to bring PRC1 to specific genes. When PRC1 is bound to DNA it can modify the DNA associated proteins, which lead to silencing of the gene to which it binds", says postdoc Xudong Wu, who has led the experimental part of the investigation.

Fbxl10 is a potential target for cancer therapy


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Contact: Katrine Sonne-Hansen
katrine.sonne@bric.ku.dk
(45) 35-32-56-48
University of Copenhagen
Source:Eurekalert  

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