Integrating image analysis with single cell RNA-seq data to study podocyte-specific changes in diabetic kidney...

Area of Science:

• Nephrology
• Cell Biology
• Pathology

Background:

• Podocyte injury is central to diabetic kidney disease (DKD) progression.
• Morphological changes in podocyte nuclei and chromatin distribution occur but lack quantification.
• The molecular drivers of these podocyte variations in DKD remain unclear.

Purpose of the Study:

• To quantify podocyte nuclear morphometrics in DKD.
• To identify molecular mechanisms underlying podocyte morphometric variations in DKD.
• To explore podocyte subpopulations and lineage changes during DKD.

Main Methods:

• Morphometric quantification of podocyte nuclei from murine DKD models.
• Single-cell RNA sequencing (scRNA-seq) analysis of podocytes from murine DKD models.
• Gene set enrichment analysis (GSEA) to identify molecular pathways.

Main Results:

• Diabetic podocyte nuclei exhibit significantly different textural features compared to controls.
• Morphometric analysis revealed multiple podocyte subpopulations, suggesting varied injury responses.
• scRNA-seq identified five podocyte subpopulations and highlighted epithelial-to-mesenchymal transition and apoptotic pathways in diabetic mice.
• Two distinct podocyte lineages were observed in both control and diabetic conditions, indicating phenotypical changes.

Conclusions:

• Podocyte nuclear textural variations are significant in DKD and may indicate distinct subpopulations.
• Molecular pathways including EMT and apoptosis are implicated in podocyte injury during DKD.
• DKD induces phenotypical changes in podocytes, potentially altering their lineage and response to injury.