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Development ePress online publication date 30 May 2007
doi: 10.1242/dev.006155

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Research article: Development and Disease

Wnt/{beta}-catenin signaling regulates nephron induction during mouse kidney development


Joo-Seop Park, M. Todd Valerius, and Andrew P. McMahon*
* Author for correspondence (e-mail: amcmahon{at}mcb.harvard.edu)

Mammalian nephrons form as a result of a complex morphogenesis and patterning of a simple epithelial precursor, the renal vesicle. Renal vesicles are established from a mesenchymal progenitor population in response to inductive signals. Several lines of evidence support the sequential roles of two Wnt family members, Wnt9b and Wnt4, in renal vesicle induction. Using genetic approaches to specifically manipulate the activity of {beta}-catenin within the mesenchymal progenitor pool in mice, we investigated the potential role of the canonical Wnt pathway in these inductive events. Progenitor-cell-specific removal of {beta}-catenin activity completely blocked both the formation of renal vesicles and the expected molecular signature of an earlier inductive response. By contrast, activation of stabilized {beta}-catenin in the same cell population causes ectopic expression of mesenchymal induction markers in vitro and functionally replaces the requirement for Wnt9b and Wnt4 in their inductive roles in vivo. Thus, canonical Wnt signaling is both necessary and sufficient for initiating and maintaining inductive pathways mediated by Wnt9b and Wnt4. However, the failure of induced mesenchyme with high levels of {beta}-catenin activity to form epithelial structures suggests that modulating canonical signaling may be crucial for the cellular transition to the renal vesicle.


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