Transcriptional and functional motifs defining renal function revealed by single-nucleus RNA sequencing

Area of Science:

• Developmental Biology
• Genomics
• Comparative Physiology

Background:

• The Drosophila renal system, comprising Malpighian tubules and nephrocytes, shares functional similarities with the mammalian kidney.
• Understanding its cellular diversity is crucial for comparative studies and disease modeling.

Purpose of the Study:

• To comprehensively characterize cell types and gene expression within the adult Drosophila renal system using single-nucleus sequencing.
• To identify key transcription factors and genes regulating renal cell function and morphology.
• To establish cross-species homologies between Drosophila, mouse, and planarian kidney cell types.

Main Methods:

• Single-nucleus RNA sequencing (snRNA-seq) of the adult Drosophila renal system.
• Bioinformatic analysis to identify distinct cell clusters and transcription factor profiles.
• Cross-species comparative analysis of kidney cell types.

Main Results:

• Identification of 11 distinct cell clusters, including renal stem cells, stellate cells, principal cells, garland nephrocytes, and pericardial nephrocytes.
• Characterization of transcription factors like fruitless (fru) for stem cell regeneration and Hepatocyte nuclear factor 4 (Hnf4) for metabolic regulation.
• Discovery of genes (e.g., RhoGEF64c, Frq2) involved in stellate cell morphology and visualization of ion transport/junctional permeability genes at the organ level.

Conclusions:

• The study provides a comprehensive single-nucleus atlas of the Drosophila kidney, revealing cellular diversity and functional gene regulation.
• Identified cell type homologies across species can inform the generation of kidney disease models.
• This resource facilitates future research into renal system organization and physiology.