• Haya N Holmegard, Juliane Theilade, Marianne Benn, Morten Duno, Stig Haunso, and Jesper H Svendsen.
• Laboratory of Molecular Cardiology, Copenhagen University Hospital, Copenhagen, Denmark.
• Cardiology. 2010 Jan 1; 115 (3): 176-81.

BackgroundSinus node dysfunction (SND) is a heterogeneous disorder of unknown etiology characterized by a variety of supraventricular arrhythmias with symptoms of syncope, palpitations, and dizziness. The mechanism underlying the abnormal rhythm is incompletely understood.ObjectiveBecause vagal stimulation and acetylcholine (ACh) affect the function of pacemaker cells, we hypothesized that genetic variation in the genes encoding the ACh-activated K(+) channels, the KACh channels, could be involved in the pathogenesis of SND.Methods And ResultsWe screened 184 patients listed in the pacemaker registry of the Copenhagen University Hospital aged <60 years at pacemaker implantation for SND in the period 1982-2005. Forty-three patients fulfilled the following inclusion criteria: documented sinus arrest, asystole, or extreme sinus bradycardia. The coding sequences of KCNJ3 and KCNJ5, encoding the main subunits of the KACh channels, were re-sequenced. We identified several known single nucleotide polymorphisms in KCNJ3 and KCNJ5, but no mutations in either of the genes.ConclusionsGenetic variation in KCNJ3 and KCNJ5 encoding the subunits of the KACh channels is apparently not involved in the pathogenesis of SND.

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