Single-cell transcriptomics provides insights into hypertrophic cardiomyopathy.

Area of Science:

• Cardiovascular Medicine
• Genetics
• Molecular Biology

Background:

• Hypertrophic cardiomyopathy (HCM) is a genetic heart disease causing unexplained heart muscle thickening, often in the septum.
• While sarcomeric gene mutations are common causes, the mechanisms behind heterogeneous cardiac remodeling in HCM are not fully understood.
• Improved understanding of gene networks controlling cardiomyocyte (CM) hypertrophy is crucial for developing effective HCM therapies.

Purpose of the Study:

• To investigate the molecular mechanisms underlying cardiomyocyte hypertrophy in human hypertrophic cardiomyopathy.
• To identify functional links between genes, transcription factors, and cell size in HCM using patient-derived samples.
• To explore the utility of single-cell RNA sequencing for studying the hypertrophic human heart.

Main Methods:

• Single-cell RNA sequencing (scRNA-seq) was performed on septal myectomy samples from patients with HCM.
• Analysis focused on identifying gene networks, transcription factors, and cell size correlations relevant to HCM.
• scRNA-seq data was used to characterize cardiomyocyte heterogeneity and molecular events in the hypertrophic heart.

Main Results:

• scRNA-seq successfully provided insights into the molecular landscape of the human hypertrophic heart.
• Significant heterogeneity was observed among cardiomyocytes in HCM samples.
• Functional links between specific genes, transcription factors, and cardiomyocyte size were identified, offering potential therapeutic targets.

Conclusions:

• Single-cell RNA sequencing is a valuable tool for dissecting molecular events in human hypertrophic cardiomyopathy.
• The study highlights cardiomyocyte heterogeneity and identifies key molecular players in HCM pathogenesis.
• Findings provide a foundation for developing targeted therapeutic strategies to improve treatment for HCM patients.