Why the study?
Sex-specific mechanisms linking circadian timekeeping to cardiac electrophysiology and arrhythmia susceptibility are not fully understood.
BMAL1 coordinates sex-specific circadian regulation of cardiac ion channels and autonomic signaling at the mRNA level, potentially creating distinct temporal vulnerability windows for arrhythmias in males versus females.
Hypothesis-generating for sex-specific arrhythmia mechanisms; clinical translation of Bmal1 targeting premature.
Sudden cardiac death, myocardial infarction, and ventricular arrhythmias display 24-hour day-night patterns with sex-specific differences1-3, suggesting sex-specific mechanisms linking circadian timekeeping to cardiac electrophysiology. We propose that the core circadian clock gene Bmal1 regulates sex-specific expression of cardiac ion channel, autonomic receptor, and autonomic signaling genes, potentially contributing to differences in arrhythmia susceptibility between sexes.
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Delisle et al. (2025) studied this question.
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