Integrated Bulk and Single-Cell Transcriptomic Analysis Reveals Mitochondrial Transporter Gene Programs in Human...

Area of Science:

• Cell Biology
• Genetics
• Metabolism

Background:

• Mitochondrial protein import and transporter systems are crucial for stem cell function.
• The specific transcriptional landscape of mitochondrial translocase (TOM/TIM) and transporter genes in human spermatogonial stem cells (SSCs) is not well understood.

Purpose of the Study:

• To define the transcriptional architecture of mitochondrial translocase (TOM/TIM) and transporter genes in human SSCs.
• To identify key regulatory nodes and potential miRNA regulators within these networks.

Main Methods:

• Integrative analysis of bulk microarray and single-cell RNA-sequencing (scRNA-seq) data.
• Differential gene expression analysis, weighted gene co-expression network analysis (WGCNA), and protein-protein interaction mapping.
• miRNA-mRNA regulatory inference and independent scRNA-seq dataset validation.

Main Results:

• SSCs exhibit coordinated enrichment of mitochondrial transporter genes, including TOMM and TIMM family members, ATPases, and SLC transporters, compared to fibroblasts.
• Key hub genes (TOMM22, TIMM17A, ATP6V1A, SLC25A3) were identified with high network centrality and enrichment in undifferentiated SSCs.
• Potential post-transcriptional regulators, including specific miRNAs (hsa-miR-4732-3p, hsa-miR-6503-3p), were predicted.

Conclusions:

• Human SSCs display a distinct mitochondrial transporter gene expression profile, emphasizing protein import and metabolic transport.
• This study provides a molecular framework for understanding mitochondrial regulation in SSCs.
• Identified genes and miRNAs serve as potential targets for investigating germline metabolism and stem cell maintenance.