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Nature Genetics · Oct 31, 2025

An African ancestry-specific nonsense variant inCD36is associated with a higher risk of dilated cardiomyopathy

The high burden of dilated cardiomyopathy (DCM) in individuals of African descent remains incompletely explained. Here, to explore a genetic basis, we conducted a genome-wide association study in 1,802 DCM cases and 93,804 controls of African genetic ancestry (AFR). A nonsense variant (rs3211938:G) inCD36was associated with increased risk of DCM. This variant, believed to be under positive selection due to a protective role in malaria resistance, is present in 17% of AFR individuals but <0.1% of European genetic ancestry (EUR) individuals. Homozygotes for the risk allele, who comprise ~1% of the AFR population, had approximately threefold higher odds of DCM. Among those without clinical cardiomyopathy, homozygotes exhibited an 8% absolute reduction in left ventricular ejection fraction. In AFR, the DCM population attributable fraction for theCD36variant was 8.1%. This single variant accounted for approximately 20% of the excess DCM risk in individuals of AFR compared to those of EUR. Experiments in human induced pluripotent stem cell-derived cardiomyocytes demonstrated thatCD36loss of function impairs fatty acid uptake and disrupts cardiac metabolism and contractility. These findings implicateCD36loss of function and suboptimal myocardial energetics as a prevalent cause of DCM in individuals of African descent.

Cardiomyopathies Genome-wide association studies biology