2025/06/05 by Qianru Wang, Tiffany M. Tang, Michelle Youlton +21 · 2 voices · 1 citation
Biochemistry, Genetics and Molecular Biology · Medicine · #Cardiac Fibrosis and Remodeling #Cardiomyopathy and Myosin Studies #Congenital heart defects research
paper · pdf · doi:10.1038/s44161-025-00656-8
openalex publication_date 2025/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23
Although genetic variant effects often interact nonadditively, strategies to uncover epistasis remain in their infancy. Here we develop low-signal signed iterative random forests to elucidate the complex genetic architecture of cardiac hypertrophy, using deep learning-derived left ventricular mass estimates from 29,661 UK Biobank cardiac magnetic resonance images. We report epistatic variants near CCDC141, IGF1R, TTN and TNKS, identifying loci deemed insignificant in genome-wide association studies. Functional genomic and integrative enrichment analyses reveal that genes mapped from these loci share biological process gene ontologies and myogenic regulatory factors. Transcriptomic network analyses using 313 human hearts demonstrate strong co-expression correlations among these genes in healthy hearts, with significantly reduced connectivity in failing hearts. To assess causality, RNA silencing in human induced pluripotent stem cell-derived cardiomyocytes, combined with novel microfluidic single-cell morphology analysis, confirms that cardiomyocyte hypertrophy is nonadditively modifiable by interactions between CCDC141, TTN and IGF1R. Our results expand the scope of cardiac genetic regulation to epistasis. Wang, Tang and colleagues develop the low-signal signed iterative random forest pipeline to investigate epistasis in the genetic control of cardiac hypertrophy, identifying epistatic variants near CCDC141, IGF1R, TTN and TNKS loci, and show that hypertrophy in induced pluripotent stem cell-derived cardiomyocytes is nonadditively influenced by interactions among CCDC141, TTN and IGF1R.