Tissue-specific smooth muscle cell subtypes identified by transcriptional profiling

Area of Science:

• Cell Biology
• Genomics
• Transcriptomics

Background:

• Smooth muscle cells (SMCs) are crucial for diverse tissue functions.
• Understanding SMC heterogeneity is key to comprehending tissue-specific roles.

Purpose of the Study:

• To investigate the transcriptomic landscape of tissue-specific SMCs.
• To identify marker genes, pathways, and cell-cell interactions.
• To discover novel SMC subtypes and sex-based expression differences.

Main Methods:

• Analysis of single-cell RNA sequencing data from the Tabula Muris compendium.
• Extraction of SMC transcriptomes from eight mouse tissues.
• Unsupervised clustering to identify SMC subtypes.

Main Results:

• Identification of enriched marker genes, signaling pathways, and biological processes in tissue-specific SMCs.
• Inferred ligand-receptor interactions between SMCs and other cell types.
• Discovery of sex differences in SMC gene expression and novel SMC subtypes.

Conclusions:

• SMC phenotypes are highly variable and adaptable to specific tissue functions.
• This adaptability is driven by distinct transcriptomic profiles and subtypes.
• The study provides a comprehensive resource for understanding SMC diversity.