Related Experiment Video
Updated: Jul 29, 2026
Evaluation of Zebrafish Kidney Function Using a Fluorescent Clearance Assay
Published on: February 20, 2015
Pax2 in development and renal disease
1Department of Pathology, The University of Michigan Medical Center, Ann Arbor 48109-0650, USA. dressler@umich.edu
Abstract:
Pax genes are associated with a variety of developmental mutations in mouse and man that are gene dosage sensitive, or haploinsufficient. The Pax2 gene encodes a DNA binding, transcription factor whose expression is essential for the development of the renal epithelium. Both gain and loss of function mutants in the mouse demonstrate a requirement for Pax2 in the conversion of metanephric mesenchymal precursor cells to the fully differentiated tubular epithelium of the nephron. However, Pax2 expression is down-regulated as cells leave the mitotic cycle. Humans carrying a single Pax2 mutant allele exhibit renal hypoplasia, vesicoureteric reflux, and optic nerve colobomas. Conversely, persistent expression of Pax2 has been demonstrated in a variety of cystic and dysplastic renal diseases and correlates with continued proliferation of renal epithelial cells. Thus, Pax2 misexpresssion may be a key determinant in the initiation and progression of renal diseases marked by increased or deregulated cell proliferation.
Insights
Pax2 gene mutations cause developmental defects in the kidneys and eyes. Aberrant Pax2 expression is linked to kidney diseases involving abnormal cell proliferation.
Area of Science:
- Developmental Biology
- Genetics
- Nephrology
Background:
- Pax genes are crucial for development and are sensitive to gene dosage.
- Pax2 is a transcription factor essential for renal (kidney) epithelium development.
Purpose of the Study:
- To investigate the role of Pax2 in kidney development and disease.
- To understand the implications of Pax2 misexpression in renal pathologies.
Main Methods:
- Studied gain and loss of function mutants in mice to assess Pax2's role in nephron development.
- Examined human patients with Pax2 mutations and analyzed Pax2 expression in diseased kidney tissues.
Main Results:
- Pax2 is required for converting precursor cells into differentiated kidney tubules.
- Pax2 expression decreases as cells exit the cell cycle.
- Human Pax2 mutations lead to kidney hypoplasia, reflux, and optic nerve colobomas.
- Persistent Pax2 expression correlates with cell proliferation in cystic and dysplastic kidney diseases.
Conclusions:
- Pax2 is vital for normal kidney development, regulating cell differentiation.
- Misexpression of Pax2, particularly its persistent expression, is implicated in the initiation and progression of renal diseases characterized by abnormal cell proliferation.
More Related Videos
07:35Use of Ultra-high Field MRI in Small Rodent Models of Polycystic Kidney Disease for In Vivo Phenotyping and Drug Monitoring
Published on: June 23, 2015
08:46Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
Published on: September 1, 2015
