Integrating Microarray Data and Single-Cell RNA-Seq Reveals Key Gene Involved in Spermatogonia Stem Cell Aging

Area of Science:

• Reproductive biology and stem cell research.
• Genomics and bioinformatics.

Background:

• In vitro generation of spermatogonial stem cells (SSCs) from embryonic stem cells (ESCs) is a promising strategy for male infertility.
• Understanding the molecular mechanisms and aging process of SSCs is crucial but challenging due to limited quantities and lack of precise indicators.

Purpose of the Study:

• To identify SSC-specific transcription factors (TFs) and hub genes involved in SSC generation and aging.
• To elucidate the molecular and functional connections regulating SSCs for improved in vitro induction efficiency.

Main Methods:

• Genome-wide transcriptomic analysis using microarrays and RNA-seq data from fibroblasts and SSCs.
• Weighted Gene Co-expression Network Analysis (WGCNA) integrating ATAC-seq, DNase-seq, and gene expression data.
• Functional enrichment analysis using Enrich Shiny GO, STRING, and Cytoscape to identify key biological processes and molecular functions.

Main Results:

• Identified 6 upregulated and 23 downregulated genes in aged SSCs compared to normal.
• Functional enrichment analysis revealed significant alterations in cell-matrix adhesion, telomerase activity, and telomere cap complex.
• Identified key SSC-specific TFs and hub genes, suggesting their role in SSC generation and regulation.

Conclusions:

• Cell-specific TFs and TF-mediated gene regulatory networks (GRNs) are critical for SSC generation.
• The identified hub SSC-specific genes and TFs can potentially improve in vitro ESC to SSC differentiation efficiency.
• These findings may offer insights into the pathophysiology of infertility and aberrant germ cell development.