New! Sign up for our free email newsletter.
Science News
from research organizations

Researchers uncover new mechanism of gene regulation involved in tumor progression

Ready, set, go for crossing the barrier for transcription!

Date:
January 8, 2019
Source:
Center for Genomic Regulation
Summary:
Researchers have discovered a new mechanism controlling the expression of a set of genes important for cell proliferation and tumor progression. Their research responds to a very fundamental question about how key genes lead to tumors growth by maintaining their active expression. This finding opens the possibility to better target and develop new therapies for certain types of cancer.
Share:
FULL STORY

Genes contain all the information needed for the functioning of cells, tissues, and organs in our body. Gene expression, meaning when and how are the genes being read and executed, is thoroughly regulated like an assembly line with several things happening one after another.

Researchers at the Centre for Genomic Regulation (CRG) in Barcelona, Spain, in collaboration with scientists at the structural bioinformatics group, University Pompeu Fabra (UPF) and department of molecular epigenetics, Helmholtz Center Munich, Germany, have discovered a new step in this line, which controls the expression of some genes with an important role in cancer. "We observed that breast cancer cells need a particular modification to express a set of genes required for cellular proliferation and tumour progression," explains Priyanka Sharma, CRG researcher and first author of the paper. "This modification allows the enzyme RNA polymerase II to overcome a pausing barrier and to continue to transcribe these genes," adds Sharma, who is a Beatriu de Pinós postdoctoral researcher (cofunded by EU Marie Curie Fellowship) and also received funding from Novartis and the CRG internal call for women scientists (Women Scientists Support Grant -- WOSS).

Cancer cells are willing to quickly proliferate so, genes involved in cell division and proliferation are really active and usually highly expressed. Such a precise and meticulous machinery involves many different molecules to properly function. In this case, when all the machinery to express proliferation genes is ready, it still has to wait for a particular modification to go. As in race when runners are asked to be ready, set and go. Here, the polymerase is also ready and set but still needs a final modification to cross the barrier for transcription and go.

"Deciphering every single step and all actors involved in this process is an important achievement in terms of fundamental science. We are now able to better understand how an intricate mechanism of gene regulation actually works and this might be a new target for clinical researchers to study novel therapies for certain types of cancer," states Miguel Beato, CRG group leader and principal investigator in this work.

The work, which has been published in Molecular Cell, describes a novel modification of in the Carboxyl terminal domain of RNA Polymerase II, namely the de-imination of an arginine, by the enzyme PADI2, which allows the polymerase to transcribe genes relevant for cancer cell growth. "Most chemo-therapies are oriented at blocking the activity of enzymes, but we know that PADI2 participates in many different processes involving the nervous system, immune response and inflammation, among others. Thus, inhibiting PADI2 would have multiple side effects. Our results make it possible to target just the particular action of PADI2 on RNA polymerase needed for tumour progression without globally blocking the enzyme," explains Beato.


Story Source:

Materials provided by Center for Genomic Regulation. Note: Content may be edited for style and length.


Journal Reference:

  1. Priyanka Sharma, Antonios Lioutas, Narcis Fernandez-Fuentes, Javier Quilez, José Carbonell-Caballero, Roni H.G. Wright, Chiara Di Vona, François Le Dily, Roland Schüller, Dirk Eick, Baldomero Oliva, Miguel Beato. Arginine Citrullination at the C-Terminal Domain Controls RNA Polymerase II Transcription. Molecular Cell, 2019; 73 (1): 84 DOI: 10.1016/j.molcel.2018.10.016

Cite This Page:

Center for Genomic Regulation. "Researchers uncover new mechanism of gene regulation involved in tumor progression." ScienceDaily. ScienceDaily, 8 January 2019. <www.sciencedaily.com/releases/2019/01/190108125414.htm>.
Center for Genomic Regulation. (2019, January 8). Researchers uncover new mechanism of gene regulation involved in tumor progression. ScienceDaily. Retrieved February 22, 2024 from www.sciencedaily.com/releases/2019/01/190108125414.htm
Center for Genomic Regulation. "Researchers uncover new mechanism of gene regulation involved in tumor progression." ScienceDaily. www.sciencedaily.com/releases/2019/01/190108125414.htm (accessed February 22, 2024).

Explore More
from ScienceDaily

RELATED STORIES