Common and Distinctive Intercellular Communication Patterns in Human Obstructive and Nonobstructive Hypertrophic...

Area of Science:

• Cardiology
• Genetics
• Bioinformatics

Background:

• Hypertrophic Cardiomyopathy (HCM) is a common inherited heart disorder.
• HCM presents with unexplained left ventricular hypertrophy, with or without left ventricular outflow tract (LVOT) obstruction.
• Previous studies used single-nuclei RNA sequencing (snRNA-seq) in HCM, but direct comparisons between obstructive and nonobstructive phenotypes are lacking.

Purpose of the Study:

• To perform a bioinformatic analysis comparing snRNA-seq data from obstructive and nonobstructive HCM patient samples.
• To identify differentially expressed genes and distinct intercellular communication patterns in the two HCM phenotypes.

Main Methods:

• Bioinformatic analysis of existing HCM snRNA-seq datasets.
• Differential gene expression analysis.
• Intercellular communication pathway analysis.

Main Results:

• Identified 37 differentially expressed genes in cardiomyocytes and other cell types, linked to aging, muscle contraction, cell motility, and extracellular matrix.
• Observed generally reduced intercellular communication in HCM, with specific alterations in pathways like growth factor binding and integrin binding.
• Found increased communication in nonobstructive HCM involving adenylate cyclase binding, calcium channel activity, and serine-threonine kinase activity.
• Noted increased communication between neurons/fibroblasts and immune cells, and enhanced endothelial cell communication, mediated by integrin-β1.

Conclusions:

• Common and distinct molecular mechanisms contribute to the pathogenesis of obstructive and nonobstructive HCM.
• Findings highlight specific cellular communication pathways that differ between HCM subtypes.
• These insights offer potential for personalized management strategies tailored to different HCM phenotypes.