RT Journal Article
T1 The 4q25 variant rs13143308T links risk of atrial fibrillation to defective calcium homoeostasis.
A1 Herraiz-Martínez, Adela
A1 Llach, Anna
A1 Tarifa, Carmen
A1 Gandía, Jorge
A1 Jiménez-Sabado, Verónica
A1 Lozano-Velasco, Estefanía
A1 Serra, Selma A
A1 Vallmitjana, Alexander
A1 Vázquez Ruiz de Castroviejo, Eduardo
A1 Benítez, Raúl
A1 Aranega, Amelia
A1 Muñoz-Guijosa, Christian
A1 Franco, Diego
A1 Cinca, Juan
A1 Hove-Madsen, Leif
K1 Human atrial myocytes
K1 Ryanodine receptor
K1 Sarcoplasmic reticulum calcium release
K1 Single nucleotide polymorphisms
K1 Spontaneous electrical activity
AB Single nucleotide polymorphisms on chromosome 4q25 have been associated with risk of atrial fibrillation (AF) but the exiguous knowledge of the mechanistic links between these risk variants and underlying electrophysiological alterations hampers their clinical utility. Here, we tested the hypothesis that 4q25 risk variants cause alterations in the intracellular calcium homoeostasis that predispose to spontaneous electrical activity. Western blotting, confocal calcium imaging, and patch-clamp techniques were used to identify mechanisms linking the 4q25 risk variants rs2200733T and rs13143308T to defects in the calcium homoeostasis in human atrial myocytes. Our findings revealed that the rs13143308T variant was more frequent in patients with AF and that myocytes from carriers of this variant had a significantly higher density of calcium sparks (14.1 ± 4.5 vs. 3.1 ± 1.3 events/min, P = 0.02), frequency of transient inward currents (ITI) (1.33 ± 0.24 vs. 0.26 ± 0.09 events/min, P  Here, we identify the 4q25 variant rs13143308T as a genetic risk marker for AF, specifically associated with excessive calcium release and spontaneous electrical activity linked to increased SERCA2 expression and RyR2 phosphorylation.
YR 2019
FD 2019
LK http://hdl.handle.net/10668/12952
UL http://hdl.handle.net/10668/12952
LA en
DS RISalud
RD Apr 17, 2025