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Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model
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Single Nucleus RNA-sequencing Reveals Altered Intercellular Communication and Dendritic Cell Activation in

Christina J Codden1, Amy Larson1, Junya Awata1

  • 1Molecular Cardiology Research Institute, Tufts Medical Center, Boston, MA, USA.

Cardiology and Cardiovascular Medicine
|October 14, 2022
PubMed

Insights

Single nucleus RNA sequencing reveals cellular communication changes in end-stage hypertrophic cardiomyopathy (HCM). These findings highlight altered extracellular matrix interactions and signaling pathways, offering potential therapeutic targets for this intractable heart condition.

Area of Science:

  • Cardiovascular Biology
  • Molecular Genetics
  • Cellular Communication

Background:

  • End-stage, nonobstructive hypertrophic cardiomyopathy (HCM) presents a significant clinical challenge due to the absence of disease-specific treatments.
  • Understanding the molecular pathogenesis of nonobstructive HCM is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying nonobstructive hypertrophic cardiomyopathy (HCM) using single nucleus RNA sequencing.
  • To identify key cellular and intercellular differences between HCM and healthy donor hearts.

Main Methods:

  • Single nucleus RNA sequencing (snRNA-seq) was performed on human HCM explant hearts and control organ donor hearts.
  • Differential gene expression analysis and ligand-receptor interaction analysis were conducted to identify molecular changes.
  • Cell-type specific expression patterns of genes, including Integrin-β1, were examined.

Main Results:

  • 64 differentially expressed genes were identified, associated with specific cell types and molecular functions in HCM hearts.
  • Significant reductions in ligand-receptor pairs related to extracellular matrix, growth factor binding, and protease activity were observed in HCM.
  • Altered Integrin-β1 expression in various cell types suggests mechanisms for fibrosis and microvascular disease; increased signaling pathway activity was also noted.

Conclusions:

  • Single nucleus RNA sequencing reveals distinct intercellular communication patterns in nonobstructive, end-stage HCM.
  • Dysregulation of extracellular matrix interactions and specific signaling cascades represent potential therapeutic targets.
  • Dendritic cells and altered Integrin-β1 signaling may play critical roles in HCM pathogenesis.

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