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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Genetics

Background:

  • Kidney development involves reciprocal interactions between metanephric mesenchyme (MM) and ureteric bud (UB).
  • Wnt4 is crucial for nephrogenesis, as Wnt4 knockout mice lack functional nephrons due to failed pretubular aggregate formation.
  • Mesenchymal-to-epithelial transition (MET) is a key step in kidney progenitor development.

Purpose of the Study:

  • To establish a Wnt4-deficient mouse embryonic stem cell (mESC) line using CRISPR/Cas9.
  • To model kidney development in vitro using mESC-derived kidney organoids.
  • To investigate the role of Wnt4 in MET during kidney organoid development.

Main Methods:

  • Generation of Wnt4 knockout mESCs via CRISPR/Cas9.
  • Differentiation of wild-type and Wnt4 knockout mESCs into kidney progenitors.
  • Induction of nephrogenesis in organoids using E11.5 mouse ureteric buds.
  • Analysis of kidney organoid structures and MET progression.

Main Results:

  • Wnt4 knockout mESCs were successfully generated.
  • Wild-type organoids formed segmented nephron structures.
  • Wnt4-deficient organoids failed to undergo MET, recapitulating in vivo Wnt4 knockout phenotypes.
  • The study established an in vitro platform combining CRISPR/Cas9 and kidney organoid technology.

Conclusions:

  • Wnt4 is indispensable for MET during kidney organoid development.
  • The in vitro kidney organoid model accurately reflects in vivo developmental processes.
  • This platform enables robust in vitro modeling of kidney development and disease.