ArticlemedRxiv : the preprint server for health sciences2025
Polygenic Background and Penetrance of Pathogenic Variants in Hypertrophic and Dilated Cardiomyopathies.
Article in medRxiv : the preprint server for health sciences, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Importance: Polygenic background modifies variant penetrance in hypertrophic (HCM) and dilated (DCM) cardiomyopathy, diseases with opposing morphologic characteristics and inversely related genetic pathways. Whether polygenic susceptibility for one disease protects against monogenic risk for the other remains unexplored. Objective: To characterize if polygenic background bidirectionally modifies pathogenicity of established rare variants associated with HCM and DCM. Design: Cross-sectional study. Setting: The Penn Medicine BioBank (PMBB). Participants: Volunteers enrolled in PMBB with available electronic health record and genotyping data. Exposures: Normalized polygenic scores (PGS) for HCM and DCM, as well as carrier status of pathogenic variants in established HCM or DCM genes. Main Outcomes: HCM and DCM defined using electronic health record diagnosis and procedure code, as well as echocardiogram measurements derived from medical records. Results: This study included 49,434 PMBB participants. An increased HCM PGS was associated with significantly increased left ventricular ejection fraction (LVEF), decreased left ventricular internal diameter at end-diastole (LVIDd), and increased interventricular septal thickness (IVS) (p<0.001). An increased DCM PGS was significantly (p<0.001) associated with decreased LVEF and increased LVIDd, but was not associated with IVS. A one standard deviation increase in HCM PGS was associated with increased risk of HCM (OR 1.8; 95% CI 1.6-2.0; p=9.6×10 Conclusions and Relevance: HCM and DCM risk are markedly modified by polygenic background which exists on an overlapping spectrum. Consideration of polygenic background may offer clinical value through improving understanding and prediction of these inherited cardiomyopathies.
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