Genetic Dissection of Hypertrophic Cardiomyopathy with Myocardial RNA-Seq

Area of Science:

• Genomics
• Cardiovascular Genetics
• Molecular Biology

Background:

• Hypertrophic cardiomyopathy (HCM) is a genetic heart muscle disorder.
• Mutations in MYH7 and MYBPC3 explain most HCM cases, but phenotype heterogeneity suggests other genetic factors.
• Novel genetic contributors and modifiers are crucial for understanding HCM complexity.

Purpose of the Study:

• To systematically analyze RNA-seq data from HCM patients and controls.
• To identify novel pathogenic variants, differentially expressed genes, and regulatory networks in HCM.
• To elucidate the complex genetic architecture underlying hypertrophic cardiomyopathy.

Main Methods:

• RNA sequencing (RNA-seq) data analysis from 28 HCM patients and 9 healthy controls.
• Pathogenic variant identification, differential gene expression analysis, and gene co-expression/protein-protein interaction network analyses.
• Gene enrichment and subnetwork analyses to identify key pathways and interactions.

Main Results:

• Identified 43 potential pathogenic variants in 19 genes across 24 HCM patients, including known HCM genes (MYBPC3, MYH7) and novel candidates.
• Detected differential expression in 2538 protein-coding genes, 6 microRNAs (miRNAs), and 1617 long noncoding RNAs (lncRNAs).
• Highlighted four key subnetworks (mtDNA, DSP, MYH7, MYBPC3) potentially involved in HCM progression.

Conclusions:

• HCM is a complex genetic disorder influenced by multiple protein-coding gene mutations.
• Non-coding RNAs (miRNAs, lncRNAs) and altered gene networks play significant roles in HCM pathogenesis.
• This study provides a comprehensive genetic and network-based view of HCM, identifying potential therapeutic targets.