Loss-of-activity-mutation in the cardiac chloride-bicarbonate exchanger AE3 causes short QT syndrome

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Kasper Thorsen, Vibeke S. Dam, Kasper Kjaer-Sorensen, Lisbeth N. Pedersen, V. Arvydas Skeberdis, Jonas Jurevicius, Rimantas Treinys, Ida M. B. S. Petersen, Morten S. Nielsen, Claus Oxvig, J. Preben Morth, Vladimir V. Matchkov, Christian Aalkjaer, Henning Bundgaard, Henrik K. Jensen

Patients with short QT syndrome (SQTS) may present with syncope, ventricular fibrillation or sudden cardiac death. Six SQTS susceptibility genes, encoding cation channels, explain <25% of SQTS cases. Here we identify a missense mutation in the anion exchanger (AE3)-encoding SLC4A3 gene in two unrelated families with SQTS. The mutation causes reduced surface expression of AE3 and reduced membrane bicarbonate transport. Slc4a3 knockdown in zebrafish causes increased cardiac pHi, short QTc, and reduced systolic duration, which is rescued by wildtype but not mutated SLC4A3. Mechanistic analyses suggest that an increase in pHi and decrease in [Cl−]i shortened the action potential duration. However, other mechanisms may also play a role. Altered anion transport represents a mechanism for development of arrhythmia and may provide new therapeutic possibilities.
Original languageEnglish
Article number1696
JournalNature Communications
Volume8
Number of pages10
ISSN2041-1723
DOIs
Publication statusPublished - 22 Nov 2017

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