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• W2080397790 abstract "Atrial fibrillation (AF) is the most common cardiac arrhythmia, affecting >2 million patients in the United States alone. Despite decades of research, surprisingly little is known regarding the molecular pathways underlying the pathogenesis of AF. ANK2 encodes ankyrin-B, a multifunctional adapter molecule implicated in membrane targeting of ion channels, transporters, and signaling molecules in excitable cells.In the present study, we report early-onset AF in patients harboring loss-of-function mutations in ANK2. In mice, we show that ankyrin-B deficiency results in atrial electrophysiological dysfunction and increased susceptibility to AF. Moreover, ankyrin-B(+/-) atrial myocytes display shortened action potentials, consistent with human AF. Ankyrin-B is expressed in atrial myocytes, and we demonstrate its requirement for the membrane targeting and function of a subgroup of voltage-gated Ca(2+) channels (Ca(v)1.3) responsible for low voltage-activated L-type Ca(2+) current. Ankyrin-B is associated directly with Ca(v)1.3, and this interaction is regulated by a short, highly conserved motif specific to Ca(v)1.3. Moreover, loss of ankyrin-B in atrial myocytes results in decreased Ca(v)1.3 expression, membrane localization, and function sufficient to produce shortened atrial action potentials and arrhythmias. Finally, we demonstrate reduced ankyrin-B expression in atrial samples of patients with documented AF, further supporting an association between ankyrin-B and AF.These findings support that reduced ankyrin-B expression or mutations in ANK2 are associated with AF. Additionally, our data demonstrate a novel pathway for ankyrin-B-dependent regulation of Ca(v)1.3 channel membrane targeting and regulation in atrial myocytes." @default.
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• W2080397790 date "2011-09-13" @default.
• W2080397790 modified "2023-10-14" @default.
• W2080397790 title "Defects in Ankyrin-Based Membrane Protein Targeting Pathways Underlie Atrial Fibrillation" @default.
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• W2080397790 doi "https://doi.org/10.1161/circulationaha.111.023986" @default.
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