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Discovery in Ghent could improve screening for sudden cardiac death
Date:12/12/2012

ARVC is a hereditary heart condition in which the heart muscle (particularly the right ventricle) is partly replaced by fatty tissue and connective tissue. Cardiac arrhythmias can occur as a result of the changes in the heart muscle. Severe arrhythmias can cause dizziness or even lead to fainting or an acute cardiac arrest (= sudden death). ARVC is a progressive disease that usually presents during the teenage years.

Known mutations in desmosomal proteins

Mutations in various genes have already been linked to ARVC. These are primarily genes that are responsible for the production of proteins in the desmosomes. Desmosomes are structures in the heart that ensure that the heart muscle cells remain connected to each other. Therefore, it was assumed that defects in the desmosomes were the most important factors in developing ARVC.

Identification of new mutations

Together with Italian scientists, Jolanda van Hengel, studied patients with ARVC who did not exhibit mutations in the desmosomal genes. The scientists identified mutations in the CTNNA3 gene in these patients, which codes for the protein αT-catenin a component of the area composita. The area composita is a structure specifically modified to the heart, where extra strong connections between cardiac muscle cells occur.

The scientists' findings indicate that there is a link between mutations in the CTNNA3 gene and ARVC. It was demonstrated for the first time that in addition to desmosomal genes an area composita gene also plays a role in the development of ARVC. Future genetic screening tests for ARVC should include the CTNNA3 gene as a standard part of the test. This would increase the value of the screening.


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Contact: Kris Van der Beken
kris.vanderbeken@vib.be
32-924-46611
VIB (the Flanders Institute for Biotechnology)
Source:Eurekalert

Page: 1

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