Single Cell Transcriptomic Analysis Reveals Organ Specific Pericyte Markers and Identities

Area of Science:

• Vascular Biology and Cell Biology
• Genomics and Bioinformatics
• Tissue-specific cell identification

Background:

• Pericytes are crucial mural cells regulating vascular development and homeostasis.
• Understanding pericyte heterogeneity and function is limited by difficulties in distinguishing them from other mural cells.
• Existing knowledge gaps hinder the understanding of pericyte roles in physiology and pathology.

Purpose of the Study:

• To identify novel pericyte-specific markers across different tissues.
• To differentiate pericytes from other mural cell populations using single-cell RNA sequencing.
• To validate identified markers in human datasets and explore conserved markers.

Main Methods:

• Analysis of single-cell RNA sequencing data from mouse pericyte populations (Tabula Muris Senis).
• Identification of mural cell clusters expressing known pericyte markers (Cspg4, Pdgfrb).
• Differential gene expression analysis to find novel pericyte markers and validation in human databases.

Main Results:

• Defined pericytes as co-expressing Cspg4 and Pdgfrb.
• Identified novel tissue-specific pericyte markers: Kcnk3 (lung), Rgs4 (heart), Myh11/Kcna5 (kidney), Pcp4l1 (bladder), Higd1b (lung/heart).
• Validated mouse pericyte markers in human lung and heart datasets, revealing conserved markers.

Conclusions:

• Successfully identified specific pericyte markers in lung, heart, kidney, and bladder.
• Revealed differentially expressed genes and functional relationships among mural cells.
• Established a foundation for further research into pericyte biology and disease.