Why the study?
Chromosomal region 4q25 SNPs are associated with increased AF risk, but their impact on cardiomyocyte and atrial function remains elusive.
Do distinct 4q25 risk variants (rs1448818, rs2200733, rs10033464) differentially affect calcium homeostasis and left atrial function to increase the risk of atrial fibrillation?
Population
391,008 UK Biobank individuals alongside human atrial tissue and myocyte cohorts
Comparison
Carriers of 4q25 risk alleles (rs1448818, rs2200733, rs10033464) vs non-carriers
Design
Observational cohort and translational mechanistic study
Follow-up
10-year period
Key result
Distinct 4q25 risk variants (rs1448818, rs2200733, rs10033464) increased incident AF over 10 years and produced differential alterations in intracellular calcium homeostasis and left atrial function.
Authors
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May inform SNP-guided AF risk models; leaves open whether tailored strategies improve outcomes.
Observational (n=391,008)
Do distinct 4q25 risk variants (rs1448818, rs2200733, rs10033464) differentially affect calcium homeostasis and left atrial function to increase the risk of atrial fibrillation?
Distinct 4q25 risk variants for atrial fibrillation produce specific alterations in intracellular calcium homeostasis and left atrial function, suggesting genotype-tailored therapeutic strategies may be possible.
This research is significant for its genetic insights into atrial fibrillation. By linking specific genetic variants to impaired calcium handling and atrial dysfunction, it provides a more detailed understanding of the molecular mechanisms underlying this common arrhythmia, which could inform future targeted therapies.
Jiménez-Sábado et al. (2026) conducted an observational in Atrial fibrillation (n=391,008). 4q25 risk variants (rs1448818, rs2200733, rs10033464) vs. Non-carriers was evaluated on Incident atrial fibrillation, calcium homeostasis alterations, and left atrial function. Distinct 4q25 risk variants (rs1448818, rs2200733, rs10033464) increased incident AF over 10 years and produced differential alterations in intracellular calcium homeostasis and left atrial function.