New advance in RNA studies holds out hope for cancer drug development

Posted by ap507 at Nov 07, 2016 04:05 PM |
International team led by University of Leicester designed a new method to find RNA structures linked to cancer

Issued by University of Leicester Press Office on 7 November

Formation of quadruplexes by RNA might allow new ways to control gene expression. Image available here (Credit: University of Leicester): https://www.dropbox.com/sh/0qqi8nks58w0rbr/AAAVM7XuFU8wfRAB2frUJmlEa?dl=0

An international research team led by the University of Leicester has made a breakthrough advance that could pave a new route for the development of anti-cancer drugs.

The advance is announced today (7 November) in an online publication in Nature Chemical Biology. The Leicester team members say they are delighted by their finding which could lead to new anti-cancer drugs thanks to “wonderful interdisciplinary collaboration involving biochemists and chemists from England, Scotland, France and USA.”

Professor Ian Eperon and Dr Cyril Dominguez from the University of Leicester’s Institute of Structural and Chemical Biology led the team that developed a new method to analyse the RNA step in expressing our genetic code.

Dr Dominguez, of the Department of Molecular and Cell Biology, said: “Our research aims at understanding how four-stranded RNA structures called G-quadruplexes affect cellular processes such as RNA splicing. In this research, we describe a novel method that, for the first time, allows us to show that G-quadruplexes form in long RNAs and in conditions where the splicing reaction can take place.”

G-quadruplexes are specific structures formed when a piece of DNA or RNA folds into a four-stranded structure. DNA G-quadruplexes have been shown to be associated with diseases such as cancer and many small molecules called G-quadruplex binders have been developed as putative novel anti-cancer drugs, the best example being Quarfloxin that reached a phase II clinical trial. RNA G-quadruplexes are also believed to play important roles in cancers but to date there are no straightforward methods to prove that they exist in cells. If they form and do control RNA splicing, then the design of molecules that bind them would be a new route for the development of anti-cancer drugs.

During the process of gene expression, DNA is transcribed to RNA molecules that are in turn translated to produce proteins. RNA splicing is an essential step in producing the finished messenger RNA and the RNA copied from one gene can be spliced in different ways. This is how the 20,000 human genes can produce around 130,000 proteins.

This process is highly regulated and defects in its regulation are a common cause of many diseases, including spinal muscular atrophy and some cancers.

Professor Eperon said: “Our novel method, FOLDeR, will allow RNA scientists to investigate the existence of G-quadruplexes in physiological condition allowing a better understanding of their role in cellular processes. It is particularly interesting that the RNA we have been studying is one that plays an important role in some cancers. When the RNA is spliced using one set of sites, it produces a protein favouring cell survival. This is a problem for cancer treatments, many of which work by damaging growing cells in the hope that they will then die. However, when an alternative set of sites is used, the RNA produces a protein that encourages cell death. We have shown that G-quadruplexes form near the alternative sites, and our hope is that we can target these to shift splicing towards the pro-death pattern.”

This is a major step forward in the G-quadruplex research field. In a follow-up paper, the team will report their work on drugs that exploit this structure.

Dr Dominguez added: “We are delighted that a prestigious journal such as Nature Chemical Biology recognize the importance of our work. This has been a wonderful interdisciplinary collaboration involving biochemists and chemists from England, Scotland, France and USA.

“This publication is crucial for us to obtain further funding and carry on with this topic. Our next step is to investigate the effect of G-quadruplex binders on RNA splicing and use this knowledge to design novel drugs with a high degree of specificity for cancer cells.”

  • The work has been funded by an MRC Career Development Award to Cyril Dominguez that started in October 2010 and finished in September 2015, and a Sir Dudley Spurling Post Graduate Scholarship from the Bank of Butterfield Foundation in Bermuda to Carika Weldon. The work was also funded by CNRS and Lorraine University and the European Alternative Splicing Network of Excellence.
  • This work is the result of a very fruitful collaboration with the groups of Dr. Glenn Burley (University of Strathclyde), Drs Isabelle Behm-Ansmant and Christiane Branlant (CNRS, Nancy, France) and Prof. Laurence Hurley (University of Arizona).
  • The Advance online publication will be on the Nature Chemical Biology website on the 7th of November. The DOI for this article is: 10.1038/nchembio.2228

NOTE TO NEWSDESK:

For interviews contact:

Dr. Cyril Dominguez: cd180@le.ac.uk

Prof. Ian Eperon: eci@le.ac.uk

About the Leicester Institute of Structural and Chemical Biology

The Leicester Institute of Structural and Chemical Biology was created in 2016 with the aim of bringing together established strengths in structural biology, chemical biology and single-molecule research. The new Institute will take advantages of synergies in research technologies and approaches to deliver major advances in both fundamental and translational research.

The Institute’s research is organised into four inter-related research strands:

Understanding the structure and mechanism of macromolecular complexes

Some of the most challenging questions in biology involve understanding the structures and mechanism of action of the molecular machines that carry out the processes of life.

Structure-based drug discovery and design

Structural biology provides us enormous insight into the mechanism of action of macromolecules and complexes. At the same time it provides detailed insights into strategies to develop small and medium-sized molecules that can alter protein functions and serve as effective therapeutics.

Using single molecule techniques to understand complex and dynamic biological processes

Many fundamental cellular processes rely on highly dynamic interactions between macromolecules and macromolecular complexes. Single molecule techniques allow us to observe and understand these processes in real time.

Chemical probes and compound libraries development

Understanding how macromolecules carry out their many diverse activities requires an understanding of the underlying chemistry which determines the behaviour of these complexes. By exploiting this chemistry we are able to manipulate macromolecular function and activity. This is important both for drug development, but also the development of research tools.

Share this page: