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deCODE Finds Genetic Factors Impacting Key Clinical Measurements of Heart Activity and Disease Risk
Date:1/10/2010

REYKJAVIK, Iceland, January 10 /PRNewswire-FirstCall/ --

- Novel SNPs Modulate ECG Measurements Including Heart Rate, Two are Also Risk Factors for Atrial Fibrillation and Will be Integrated Into deCODE AF(TM) Test

Scientists at deCODE genetics today report the discovery of seven novel and common single-letter variations in the sequence of the human genome (SNPs) that are involved in modulating the electrical impulses that govern the working of the heart. Two of these SNPs, which correlate with electrocardiogram (ECG or EKG) measurements that are used in the clinical evaluation of heart health and activity, were then shown to confer increased risk of atrial fibrillation (AF), one of the most common causes of irregular heartbeat and a leading cause of stroke. The paper, "Several common variants modulate heart rate, PR interval and QRS duration," is published online in Nature Genetics at http://www.nature.com/ng, and will appear in an upcoming print addition of the journal.

The deCODE team began by correlating ECG measurements with genome-wide SNP data from more than 40,000 Icelandic participants in its gene discovery program. This search identified one novel SNP influencing heart rate and four each linked to PR interval and QRS duration, measurements of how quickly the electrical impulses that cause the heart muscles to pump achieve their purpose. Intriguingly, SNPs on chromosome 3 linked to both longer PR interval and QRS duration are in the gene encoding SCN10A, a sodium channel that has never before been linked to heart activity. Individuals with the same variants were also more likely to have been fitted with a pacemaker. A follow-on analysis of all of the no
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SOURCE DeCODE Genetics Inc
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