Abstract
THE kidney has been widely exploited as a model system for the study of tissue inductions regulating vertebrate organogenesis1,2. Kidney development is initiated by the ingrowth of the Wolfian duct-derived ureteric bud into the presumptive kidney mesenchyme. In response to a signal from the ureter, mesenchymal cells condense, aggregate into pretubular clusters and undergo an epithelial conversion generating a simple tubule. This then undergoes morphogenesis and is transformed into the excretory system of the kidney, the nephron. We report here that the expression of Wnt-4, which encodes a secreted glycoprotein, correlates with, and is required for, kidney tubulogenesis. Mice lacking Wnt-4 activity fail to form pretubular cell aggregates; however, other aspects of mesenchymal and ureteric development are unaffected. Thus, Wnt-4 appears to act as an autoinducer of the mesenchyme to epithelial transition that underlies nephron development.
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Stark, K., Vainio, S., Vassileva, G. et al. Epithelial transformation of metanephric mesenchyme in the developing kidney regulated by Wnt-4. Nature 372, 679–683 (1994). https://doi.org/10.1038/372679a0
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DOI: https://doi.org/10.1038/372679a0
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