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Updated: Jun 20, 2026
Assessing Cardiomyocyte Subtypes Following Transcription Factor-mediated Reprogramming of Mouse Embryonic Fibroblasts
Published on: March 22, 2017
Single-cell transcriptomics in MI identify Slc25a4 as a new modulator of mitochondrial malfunction and
Ting Zhou1,2, Jing Pan2,3, Kai Xu2
1Department of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, Hubei, China.
Abstract:
Myocardial infarction (MI) is the leading cause of premature death. The death of cardiomyocytes (CMs) and the dysfunction of the remaining viable CMs are the main pathological factors contributing to heart failure (HF) following MI. This study aims to determine the transcriptional profile of CMs and investigate the heterogeneity among CMs under hypoxic conditions. Single-cell atlases of the heart in both the sham and MI groups were developed using single-cell data (GSE214611) downloaded from Gene Expression Omnibus (GEO) database ( https://www.ncbi.nlm.nih.gov/geo/ ). The heterogeneity among CMs was explored through various analyses including enrichment, pseudo time, and intercellular communication analysis. The marker gene of C5 was identified using differential expression analysis (DEA). Real-time polymerase chain reaction (RT-PCR), bulk RNA-sequencing dataset analysis, western blotting, immunohistochemical and immunofluorescence staining, Mito-Tracker staining, TUNEL staining, and flow cytometry analysis were conducted to validate the impact of the marker gene on mitochondrial function and cell apoptosis of CMs under hypoxic conditions. We identified a cell subcluster named C5 that exhibited a close association with mitochondrial malfunction and cellular apoptosis characteristics, and identified Slc25a4 as a significant biomarker of C5. Furthermore, our findings indicated that the expression of Slc25a4 was increased in failing hearts, and the downregulation of Slc25a4 improved mitochondrial function and reduced cell apoptosis. Our study significantly identified a distinct subcluster of CMs that exhibited strong associations with ventricular remodeling following MI. Slc25a4 served as the hub gene for C5, highlighting its significant potential as a novel therapeutic target for MI.
Insights
Researchers identified a specific heart cell type (C5) linked to heart failure after myocardial infarction (MI). This cell type, marked by Slc25a4, shows potential as a therapeutic target for improving heart function and reducing cell death.
Area of Science:
- Cardiology
- Molecular Biology
- Genomics
Background:
- Myocardial infarction (MI) is a primary cause of death, leading to cardiomyocyte (CM) death and dysfunction, ultimately causing heart failure (HF).
- Understanding CM heterogeneity post-MI is crucial for developing effective treatments.
Purpose of the Study:
- To profile cardiomyocyte transcriptional changes and investigate cellular heterogeneity under hypoxic conditions following MI.
- To identify novel biomarkers and therapeutic targets for MI-induced heart failure.
Main Methods:
- Single-cell RNA sequencing (scRNA-seq) to create heart atlases from sham and MI models.
- Differential expression analysis (DEA) to identify marker genes.
- Validation using RT-PCR, RNA-seq, Western blot, immunohistochemistry, immunofluorescence, Mito-Tracker, TUNEL, and flow cytometry.
Main Results:
- A distinct cardiomyocyte subcluster (C5) associated with mitochondrial dysfunction and apoptosis was identified.
- Slc25a4 was identified as a key biomarker for C5, with its expression elevated in failing hearts.
- Downregulating Slc25a4 improved mitochondrial function and reduced CM apoptosis in hypoxic conditions.
Conclusions:
- The study identified a novel CM subcluster (C5) linked to ventricular remodeling post-MI.
- Slc25a4 is a significant hub gene for C5 and a potential therapeutic target for myocardial infarction.
