Abstract:
:Bradycardia is a trigger of ventricular arrhythmias in patients with arrhythmia including Brugada syndrome and long QT syndrome. The HCN4 channel controls the heart rate, and its mutations predispose to inherited sick sinus syndrome and long QT syndrome associated with bradycardia. We found a 4 base-insertion at the splice donor site of the HCN4 gene in a patient with idiopathic ventricular tachycardia, which was supposed to generate a truncated channel. To investigate the role of the HCN4 channel in ventricular arrhythmia, we introduced a ventricular action potential of I(f) channel produced by HCN4 in a computer simulation model and found that the I(f) channel generated a leaky outward current during the plateau phase of ventricular action potential. Currents through the I(f) channel were suggested to contribute to the shortening of the action potential duration and the prevention of early after-depolarization in bradycardia. These observations suggested that the HCN4 channel played a preventive role in triggering bradycardia-induced ventricular arrhythmias.
journal_name
J Hum Genetjournal_title
Journal of human geneticsauthors
Ueda K,Hirano Y,Higashiuesato Y,Aizawa Y,Hayashi T,Inagaki N,Tana T,Ohya Y,Takishita S,Muratani H,Hiraoka M,Kimura Adoi
10.1038/jhg.2008.16subject
Has Abstractpub_date
2009-02-01 00:00:00pages
115-21issue
2eissn
1434-5161issn
1435-232Xpii
jhg200816journal_volume
54pub_type
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