Key result
Specific MCU complex gene variants and haplotypes are linked to greater SCD-CAD susceptibility.
Why the study?
The specific genetic factors linked to mitochondrial dysfunction in sudden cardiac death related to coronary artery disease remain poorly understood.
Are genetic variations in the mitochondrial calcium uniporter (MCU) complex associated with increased susceptibility to sudden cardiac death in patients with coronary artery disease?
Case-Control (n=827)
Are genetic variations in the mitochondrial calcium uniporter (MCU) complex associated with increased susceptibility to sudden cardiac death in patients with coronary artery disease?
Specific genetic variations in the mitochondrial calcium uniporter complex are associated with increased susceptibility to sudden cardiac death in patients with coronary artery disease, highlighting potential biomarkers for risk stratification.
Answers are grounded in this paper and cite their sources.
May implicate mitochondrial-related variants in SCD-CAD susceptibility; leaves open validation and any clinical utility in broader populations.
Sudden cardiac death (SCD) is a major cause of cardiovascular mortality, with coronary artery disease-related SCD (SCD-CAD) being the most prevalent form. Genetic factors and mitochondrial dysfunction, particularly in calcium homeostasis, are critical in SCD-CAD. However, the specific genetic factors linked to mitochondrial dysfunction in SCD-CAD remain poorly understood. In this case-control study, we analyzed 229 SCD-CAD cases and 598 controls from a Southern Han Chinese population, focusing on 12 insertion-deletion (indel) variants across six mitochondrial calcium uniporter (MCU) complex genes. We used capillary electrophoresis-based multiplex genotyping and performed logistic regression and haplotype analyses to assess the association of these variants with SCD-CAD susceptibility. Four significant indel variants and three risk-associated haplotypes were identified. Two of these indels were previously validated in the GWAS catalog as strongly linked to cardiac disorders. Additionally, Mendelian randomization (MR) analysis revealed a causal relationship between elevated levels of the SMDT1-encoded MCU regulator and increased risks of cardiovascular diseases, including coronary atherosclerosis, myocardial infarction, and cardiomyopathy. These findings highlight the role of MCU complex variants in SCD-CAD susceptibility and suggest their potential as biomarkers for cardiovascular risk stratification. Further research with larger cohorts is needed to confirm these results and explore underlying mechanisms.
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He et al. (2025) conducted a case-control in Sudden cardiac death related to coronary artery disease (SCD-CAD) (n=827). MCU complex genetic variations (12 indel variants) vs. Controls was evaluated on SCD-CAD susceptibility. Four significant indel variants and three risk-associated haplotypes across MCU complex genes were identified as associated with SCD-CAD susceptibility.
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