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Misread heart muscle gene a new clue to sudden cardiac death

Date:
September 16, 2013
Source:
University of Warwick
Summary:
Scientists have discovered that a drug that increases the risk of sudden cardiac death interacts with mistranslated protein-coding genes present in heart muscle.

Scientists have discovered that a drug which increases the risk of sudden cardiac death interacts with mistranslated protein-coding genes present in heart muscle.

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The cardiac drug flecainide was developed to prevent and treat serious arrhythmias in the ventricles -- the main pumps of the heart. These cause very rapid heart rates which can be lethal if unchecked. However in clinical trials, flecainide, and its sister molecule encainide, were reported to more than double the risk of sudden cardiac death.

Joint work by researchers in the Department of Chemistry and Warwick Medical School at the University of Warwick, and at the SEEK drug discovery group through subsidiary Tangent Reprofiling Limited, is now allowing insight into how cardiac death risk might be increased by these drugs. The method involves persuading viruses to provide a read-out on their surface of proteins related to human heart disease.

Genes that code for proteins, including those from the heart, may be read differently to normal -- by starting at a different "letter" in the genetic code -- these are called alternative reading frame (ARF) proteins, a bit like a very simple old cipher.

In experiments just published in the Royal Society of Chemistry journal Chemical Communications, the researchers show that flecainide appears to interact with just such an ARF protein, the "normal" version of which is crucial to heart function. This opens the way to further research that may illuminate the positive and negative elements of flecainide's action.

Paul Taylor, Associate Professor in Organic Chemistry, commented "Genes provide the code for cells to make proteins. This new research indicates that flecainide is able to interact with an unexpected translation of the gene coding for the protein -- myosin regulatory light chain -- a crucial component in the contraction of heart muscle fibres."

Associate Professor of Chemistry Andrew Marsh added "The work is particularly important as it represents a new way to uncover interactions of drugs such as flecainide with ARF proteins. The fuller biomedical significance of these unusual, 'mistranslated' proteins is only just becoming recognised."

Dr Suzanne Dilly, Head of Chemical Biology at SEEK, said " I am delighted to see publication of these important results, which were enabled by sharing of expertise and technology between an excellent academic team and our drug discovery group."

Professor of Clinical Pharmacology and Therapeutics Donald Singer said "Adverse effects of drugs can be very serious. Our work shows an unexpected consequence of adverse effects of a drug: providing clues to new causes for disease and new ideas for treatments. There is clear potential to apply these methods to understanding unexplained risks of other medicines."


Story Source:

The above story is based on materials provided by University of Warwick. Note: Materials may be edited for content and length.


Journal Reference:

  1. Paul C Taylor, Andrew James Clark, A Marsh, Donald Singer, Suzanne Dilly. A Chemical Genomics Approach to Identification of Interactions between Bioactive Molecules and Alternative Reading Frame Proteins. Chemical Communications, 2013; DOI: 10.1039/C3CC44647F

Cite This Page:

University of Warwick. "Misread heart muscle gene a new clue to sudden cardiac death." ScienceDaily. ScienceDaily, 16 September 2013. <www.sciencedaily.com/releases/2013/09/130916091034.htm>.
University of Warwick. (2013, September 16). Misread heart muscle gene a new clue to sudden cardiac death. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2013/09/130916091034.htm
University of Warwick. "Misread heart muscle gene a new clue to sudden cardiac death." ScienceDaily. www.sciencedaily.com/releases/2013/09/130916091034.htm (accessed October 31, 2014).

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