SnRNA-seq reveals differential functional transcriptional pathway alterations in three mutant types of dilated...

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• Genetics of Heart Disease

Background:

• Dilated cardiomyopathy (DCM) is a primary cause of heart failure, marked by ventricular enlargement and impaired function.
• Cardiac tissue comprises diverse cells (cardiomyocytes, fibroblasts, endothelial cells, immune cells) that alter in DCM, promoting dysfunction, inflammation, and fibrosis.
• Specific gene mutations (LMNA, RBM20, TTN) are implicated in DCM pathogenesis.

Purpose of the Study:

• To analyze functional changes in cardiac cell subpopulations in DCM patients with specific gene mutations.
• To investigate the association between gene mutations and cellular functions, pathways, and cell-cell communication.
• To identify critical transcriptional regulators in DCM-affected cardiac cell states.

Main Methods:

• Functional annotation of cardiac cell subpopulations.
• Analysis of gene mutation associations with cellular functions and pathways.
• Application of the SCENIC method to identify transcriptional regulators.
• Assessment of ligand-receptor interactions for cell communication prediction.

Main Results:

• Identification of functional alterations in specific cardiomyocyte, fibroblast, endothelial, T cell, and NK cell subpopulations.
• Correlation of gene mutations (LMNA, RBM20, TTN) with distinct cellular functions and signaling pathways.
• Discovery of key transcriptional regulators within specific cell states using SCENIC.
• Prediction of intercellular communication networks based on ligand-receptor expression patterns.

Conclusions:

• Gene mutations significantly impact cardiac cell function and communication in DCM.
• Understanding cell-specific molecular mechanisms and regulatory networks is crucial for DCM.
• This research highlights potential therapeutic targets for DCM by elucidating its molecular underpinnings.