Genome-Wide Interaction Analyses of Serum Calcium on Ventricular Repolarization Time in 125 393 Participants

William J. Young*, Peter J. van der Most, The LifeLines Cohort Study, Traci M. Bartz, Maxime M. Bos, Ginevra Biino, ThuyVy Duong, Luisa Foco, Jesus T. Lominchar, Martina Mueller-Nurasyid, Giuseppe Giovanni Nardone, Alessandro Pecori, Julia Ramirez, Linda Repetto, Katharina Schramm, Xia Shen, Stefan van Duijvenboden, Diana van Heemst, Stefan Weiss, Jie YaoJan-Walter Benjamins, Alvaro Alonso, Beatrice Spedicati, Mary L. Biggs, Jennifer A. Brody, Marcus Doerr, Christian Fuchsberger, Martin Goegele, Xiuqing Guo, M. Arfan Ikram, J. Wouter Jukema, Stefan Kaeaeb, Jorgen K. Kanters, Henry J. Lin, Allan Linneberg, Matthias Nauck, Ilja M. Nolte, Giulia Pianigiani, Aurora Santin, Elsayed Z. Soliman, Paola Tesolin, Simona Vaccargiu, Melanie Waldenberger, Pim van der Harst, Niek Verweij, Dan E. Arking, Maria Pina Concas, Alessandro De Grandi, Giorgia Girotto, Niels Grarup, Maryam Kavousi, Dennis Mook-Kanamori, Pau Navarro, Michele Orini, Sandosh Padmanabhan, Cristian Pattaro, Annette Peters, Mario Pirastu, Peter P. Pramstaller, Susan R. Heckbert, Mortiz Sinner, Harold Snieder, Uwe Völker, James F. Wilson, W. James Gauderman, Pier D. Lambiase, Nona Sotoodehnia, Andrew Tinker, Helen R. Warren, Raymond Noordam, Patricia B. Munroe

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Background:

Ventricular repolarization time (ECG QT and JT intervals) is associated with malignant arrhythmia. Genome-wide association studies have identified 230 independent loci for QT and JT; however, 50% of their heritability remains unexplained. Previous work supports a causal effect of lower serum calcium concentrations on longer ventricular repolarization time. We hypothesized calcium interactions with QT and JT variant associations could explain a proportion of the missing heritability.

Methods and Results:

We performed genome-wide calcium interaction analyses for QT and JT intervals. Participants were stratified by their calcium level relative to the study distribution (top or bottom 20%). We performed a 2-stage analysis (genome-wide discovery [N=62 532] and replication [N=59 861] of lead variants) and a single-stage genome-wide meta-analysis (N=122 393, [European ancestry N=117 581, African ancestry N=4812]). We also calculated 2-degrees of freedom joint main and interaction and 1-degree of freedom interaction P values. In 2-stage and single-stage analyses, 50 and 98 independent loci, respectively, were associated with either QT or JT intervals (2-degrees of freedom joint main and interaction P value <5x10(-8)). No lead variant had a significant interaction result after correcting for multiple testing and sensitivity analyses provided similar findings. Two loci in the single-stage meta-analysis were not reported previously (SPPL2B and RFX6).

Conclusions:

We have found limited support for an interaction effect of serum calcium on QT and JT variant associations despite sample sizes with suitable power to detect relevant effects. Therefore, such effects are unlikely to explain a meaningful proportion of the heritability of QT and JT, and factors including rare variation and other environmental interactions need to be considered.
Original languageEnglish
Article numbere034760
Number of pages16
JournalJournal of the American Heart Association
Volume13
Issue number17
DOIs
Publication statusPublished - 29 Aug 2024

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