Featured Research

from universities, journals, and other organizations

Researchers Describe Mechanisms By Which Capon Gene Causes Heart Rhythm Disturbances

Date:
March 6, 2008
Source:
Cedars-Sinai Medical Center
Summary:
Researchers have described for the first time the mechanisms by which variants of a specific gene, CAPON or NOS1AP, can disrupt normal heart rhythm. Until recently, CAPON was not even suspected of existing in heart tissue or playing a role in heart function.

A research team from the Cedars-Sinai Heart Institute, Johns Hopkins University and China Medical University and Hospital in Taiwan have described for the first time the mechanisms by which variants of a specific gene, CAPON or NOS1AP, can disrupt normal heart rhythm. Until recently, CAPON was not even suspected of existing in heart tissue or playing a role in heart function.

Related Articles


The study, conducted in guinea pigs, confirms that CAPON naturally exists in the ventricles (pumping chambers) of the heart. The researchers show that CAPON interacts with a signaling molecule (NOS1) in heart muscle to influence signaling pathways and modify cell-to-cell interactions (calcium ion and potassium ion channels) that control electrical currents.

Eduardo Marbαn, M.D., Ph.D., director of the Cedars-Sinai Heart Institute, is senior author of an article, published online March 4 in Proceedings of the National Academy of Sciences (Early Edition), that fully describes these events.

The effects of CAPON and its variants are seen in the "QT interval" of EKGs, which reflect electrical activity from the time the ventricles are stimulated to the end of the heart muscle activity in a single heartbeat. Whether too long or too short, QT interval abnormalities can represent serious heart rhythm problems, including the risk of sudden death.

Long- and short-QT syndromes can be caused by rare congenital disorders that affect the ion channels, but most deaths caused by sudden arrhythmias occur in people who do not have these genetic mutations. Until recently, physicians and researchers were unable to explain the basis of QT interval abnormalities in otherwise healthy people.

In 2006, however, Marbαn was among researchers who used a new approach to gene discovery to search for genetic influences on QT interval variations. From a general population which has been extensively studied (the KORA Cohort in Germany), the researchers identified subjects who had long- or short-QT intervals. Studying the genetic makeup of those individuals, they discovered an association between QT intervals and the CAPON gene. Their findings, published in Nature Genetics, were surprising because CAPON, while known for its involvement in brain nerve cells, was not expected to exist in heart tissue.

Subsequent studies, including this one, have confirmed the existence of CAPON in heart tissue and illuminated its effects on heart function. According to the PNAS article, the new "findings provide a rationale for the association of CAPON gene variants with extremes of the QT interval in human populations."

Journal reference: Proceedings of the National Academy of Sciences of the USA, "CAPON modulates cardiac repolarization via neuronal nitric oxide synthase signaling in the heart," March 4, 2008, in PNAS Early Edition online.

Members of the research team were supported in this study by: The Donald W. Reynolds Cardiovascular Clinical Research Center; a Transatlantic Network of Excellence grant from the Le Ducq Foundation; China Medical University Hospital; German Research Foundation; and the Heart and Stroke Foundation of Canada.


Story Source:

The above story is based on materials provided by Cedars-Sinai Medical Center. Note: Materials may be edited for content and length.


Cite This Page:

Cedars-Sinai Medical Center. "Researchers Describe Mechanisms By Which Capon Gene Causes Heart Rhythm Disturbances." ScienceDaily. ScienceDaily, 6 March 2008. <www.sciencedaily.com/releases/2008/03/080303190552.htm>.
Cedars-Sinai Medical Center. (2008, March 6). Researchers Describe Mechanisms By Which Capon Gene Causes Heart Rhythm Disturbances. ScienceDaily. Retrieved January 29, 2015 from www.sciencedaily.com/releases/2008/03/080303190552.htm
Cedars-Sinai Medical Center. "Researchers Describe Mechanisms By Which Capon Gene Causes Heart Rhythm Disturbances." ScienceDaily. www.sciencedaily.com/releases/2008/03/080303190552.htm (accessed January 29, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Thursday, January 29, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Malnutrition on the Rise as Violence Flares in C. Africa

Malnutrition on the Rise as Violence Flares in C. Africa

AFP (Jan. 28, 2015) — Violence can flare up at any moment in Bambari with only a bridge separating Muslims and Christians. Malnutrition is on the rise and lack of water means simple cooking fires threaten to destroy makeshift camps where people are living. Duration: 00:40 Video provided by AFP
Powered by NewsLook.com
Poultry Culled in Taiwan to Thwart Bird Flu

Poultry Culled in Taiwan to Thwart Bird Flu

Reuters - News Video Online (Jan. 28, 2015) — Taiwan culls over a million poultry in efforts to halt various strains of avian flu. Julie Noce reports. Video provided by Reuters
Powered by NewsLook.com
Media Criticizing Parents For Not Vaccinating Children

Media Criticizing Parents For Not Vaccinating Children

Newsy (Jan. 28, 2015) — As the Disneyland measles outbreak continues to spread, the media says parents who choose not to vaccinate their children are part of the cause. Video provided by Newsy
Powered by NewsLook.com
Shark Bite Victim Making Amazing Recovery

Shark Bite Victim Making Amazing Recovery

AP (Jan. 27, 2015) — A Texas woman who lost more than five pounds of flesh to a shark in the Bahamas earlier this month could be released from a Florida hospital soon. Experts believe she was bitten by a bull shark while snorkeling. (Jan. 27) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins