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Misread heart muscle gene a new clue to risk of sudden cardiac death
Date:9/16/2013

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

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 wo
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Contact: Paul Taylor
p.c.taylor@warwick.ac.uk
44-024-765-24375
University of Warwick
Source:Eurekalert

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