Integrative Informatics Analysis of Transcriptome and Identification of Interacted Genes in the Glomeruli and Tubules...

Area of Science:

• Nephrology
• Genomics
• Molecular Biology

Background:

• Chronic kidney disease (CKD) involves complex interactions between renal tubules and glomeruli.
• The precise molecular mechanisms underlying tubular and glomerular injury in CKD remain incompletely understood.

Purpose of the Study:

• To identify differentially expressed genes (DEGs) signatures in tubules and glomeruli of CKD patients using a meta-analysis approach.
• To elucidate the distinct and overlapping functional pathways involved in tubular and glomerular injury during CKD.
• To uncover specific gene interactions between tubules and glomeruli in CKD pathogenesis, particularly in diabetic kidney disease (DKD).

Main Methods:

• Meta-analysis of transcriptome data from CKD patient tubules and glomeruli.
• Functional enrichment analysis (pathways and Gene Ontology) of identified DEGs.
• Correlation analysis to identify associated DEGs between tubules and glomeruli.
• In vitro experiments to verify interactions between secreted proteins and target genes.

Main Results:

• Tubular DEGs were primarily associated with cell assembly and remodeling.
• Glomerular DEGs were mainly involved in cell proliferation and apoptosis.
• Overlapping DEGs were significantly enriched in immune response pathways.
• WFDC2, a secreted protein from tubules, was found to downregulate PEX19 in glomeruli in DKD.

Conclusions:

• Distinct functional pathways characterize tubular and glomerular injury in CKD.
• Specific gene interactions, such as the tubule-glomerulus communication via WFDC2 and PEX19, play a role in CKD progression.
• This study provides novel insights into the molecular crosstalk between renal compartments in CKD, offering potential therapeutic targets.