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Hopkins scientists ID 10 genes associated with a risk factor for sudden cardiac death
Date:3/22/2009

QT interval by any one of the genetic variants, the alteration amounts to just a couple milliseconds, which is not a huge amount, says Arking: "But if you put all 10 genetic variants together, that bumps up the QT interval by about 20 milliseconds, which is significant."

This latest study builds on research published in 2006, when a screen of 100,000 sites in individuals of European ancestry first showed that the Nos1ap gene is associated with the QT interval; and subsequent research showing that sequence changes in Nos1ap are also a risk factor for sudden cardiac death. A third paper, published in January 2009 in PLoS one, widened the original screen to include multiethnic populations; that study confirmed that Nos1ap genetic variants alter QT interval in all populations and, in fact, have a stronger effect in women than men.

"The reason people die from this cardiovascular disorder is because we know nothing about the antecedents," Chakravarti says. "It's like a truck barreling down a slope: there's no way to stop it. The only way out is to understand the science of this in a deep, meaningful way. If we know, we can begin to intervene."


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Contact: Maryalice Yakutchik
myakutc1@jhmi.edu
443-287-2251
Johns Hopkins Medical Institutions
Source:Eurekalert

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