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Related Experiment Videos

PAX2 activates WNT4 expression during mammalian kidney development.

Elena Torban1, Alison Dziarmaga, Diana Iglesias

  • 1Department of Experimental Medicine, McGill University, Montreal, Quebec, Canada.

The Journal of Biological Chemistry
|December 22, 2005
PubMed
Summary

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The transcription factor PAX2 is crucial for kidney development, activating WNT4 gene expression in mesenchymal cells. This activation is essential for forming renal tubules during nephrogenesis.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • PAX2 is a transcription factor vital for kidney development, influencing ureteric bud branching.
  • PAX2 is also present in mesenchymal cells during nephrogenesis, but its function there is unclear.
  • WNT4 is a key glycoprotein for successful nephrogenesis.

Purpose of the Study:

  • To investigate the function of PAX2 in metanephric mesenchymal cells.
  • To determine if PAX2 activates WNT4 gene expression during kidney development.

Main Methods:

  • Co-transfection assays using JTC12 cells to assess PAX2's effect on WNT4 promoter activity.
  • Electrophoretic mobility shift assays (EMSAs) to identify PAX2 binding sites on the WNT4 gene.
  • Quantitative analysis of WNT4 mRNA levels in response to PAX2 manipulation in cell culture and heterozygous mutant mouse kidneys.

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Main Results:

  • PAX2 significantly activated WNT4 promoter activity (5-fold) in proximal tubule-derived cells.
  • Three novel PAX2 recognition motifs were identified in the WNT4 gene's 5'-flanking sequence, with specific PAX2 binding confirmed.
  • PAX2 expression increased endogenous WNT4 mRNA (7-fold) in JTC12 cells.
  • Wnt4 mRNA levels decreased by 60% in fetal kidneys from heterozygous Pax2 mutant mice.

Conclusions:

  • PAX2 directly activates WNT4 gene expression.
  • PAX2 plays a critical role in activating WNT4 in metanephric mesenchymal cells during renal tubule formation.
  • This PAX2-WNT4 interaction is essential for normal kidney development.