Sometimes, these mechanisms lose their efficiency and some of the genes that should be “switched off” remain active. This, in turn, could lead to uncontrolled cellular proliferation, and tumorigenesis. These mechanisms, present both in lower organisms as well as in mammals, have always been thought to be separated and independent.
The work, which appears on the cover this week in the June issue of the prestigious journal Cancer Cell, carried out by researchers of the Differentiation and Cancer Programme, at the Centre for Genomic Regulation (CRG), in Barcelona (Spain), demonstrates the cross-talk between these two gene silencing mechanisms in patients suffering from acute leukemia. The work, led by the ICREA researcher Luciano Di Croce, head of the group Epigenetics and Cancer, at the CRG, performed in collaboration with Kristian Helin’s group, at the Biotech Research and Innovation Centre in Copenhagen (Denmark), and Dr. Nomdedeu’s group, at the Santa Creu and Sant Pau Hospital, in Barcelona, will have important consequences in the development of new anti-tumor therapies. On the one hand, the study shows a better understanding of the basic mechanisms of gene regulation and, on the other hand, identifies a possible new pathway to reactivate erroneously “switched off” genes in tumors. In 2002, in a study published in Science, Di Croce showed that uncontrolled DNA methylation contributed to tumor progression in its first stages. Less than a year ago, Di Croce’s group described, in another study published in Nature, the biochemical connection between the Polycomb protein complex and the enzymes methylating the DNA (DNA methyltransferases).
In this new study, Di Croce has shown that the two mechanisms are not only interconnected in leukemic cells, but also that one reinforces the other and, more importantly, that one needs the other. Therefore - and this is one of the most interesting aspects of the investigation - if one of these mechanisms is blocked by specific drugs, the other will also be affected. The results achieved will allow, in the future, identifying new chemical compounds able to block both mechanisms simultaneously and exclusively, without altering other cellular mechanisms. For these reasons, this is one of the new investigations lines recently adopted by the group led by Di Croce.
Gloria Lligadas | alfa
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Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.
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