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Isolation and Culture of Cells from the Nephrogenic Zone of the Embryonic Mouse Kidney
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Published on: April 22, 2011

SIX2 and BMP4 mutations associate with anomalous kidney development.

Stefanie Weber1, Jaclyn C Taylor, Paul Winyard

  • 1Pediatric Nephrology, University Children's Hospital Heidelberg, Germany.

Journal of the American Society of Nephrology : JASN
|February 29, 2008
PubMed
Summary

New research identifies mutations in BMP4 and SIX2 genes as a cause of renal hypodysplasia (RHD), a congenital kidney maldevelopment. These findings highlight conserved roles for these genes in kidney development.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Nephrology

Background:

  • Renal hypodysplasia (RHD) involves reduced kidney size and maldevelopment due to abnormal organogenesis.
  • Mutations in specific renal developmental genes are implicated in a subset of RHD cases.

Purpose of the Study:

  • To identify genetic mutations associated with renal hypodysplasia (RHD).
  • To investigate the functional roles of BMP4 and SIX2 in kidney development and their potential link to RHD.

Main Methods:

  • Genetic analysis of RHD patients to detect mutations in BMP4 and SIX2.
  • In vivo functional assays using zebrafish overexpression and morpholino knockdown models.
  • Assessment of gene function in mesendoderm formation and glomerulogenesis.

Main Results:

  • Identified 3 BMP4 mutations in 5 RHD patients and 3 SIX2 mutations in 5 different RHD patients.
  • Zebrafish overexpression studies showed BMP4 and SIX2 mutations attenuate normal developmental effects.
  • Knockdown of bmp4 and six2.1 in zebrafish impaired glomerulogenesis, indicating critical roles in pronephros formation.

Conclusions:

  • This study reports the first mutations in BMP4 and SIX2 associated with RHD.
  • Conserved roles for Six2 and Bmp4 in renal system development are implicated.
  • Defects in BMP4 and SIX2 can disrupt kidney development at multiple stages, leading to congenital anomalies.