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Geometric effects position renal vesicles during kidney development.
Malte Mederacke1, Lisa Conrad2, Nikolaos Doumpas1
1Department of Biosystems Science and Engineering, ETH Zürich, Schanzenstrasse 44, 4056 Basel, Switzerland; Swiss Institute of Bioinformatics, Mattenstrasse 26, 4058 Basel, Switzerland.
Cell Reports
|December 7, 2023
Summary
Geometric effects concentrate WNT9b signaling at ureteric bud junctions, guiding kidney development and nephron positioning. This mechanism explains how renal vesicles form near branching collecting ducts.
Area of Science:
- Developmental Biology
- Computational Biology
- Renal Physiology
Background:
- Kidney development involves complex signaling between epithelium and mesenchyme.
- The precise positioning of nephrons relative to collecting duct branches is not well understood.
Purpose of the Study:
- To elucidate the mechanism positioning renal vesicles during kidney organogenesis.
- To understand how WNT9b signaling influences nephron formation and collecting duct branching.
Main Methods:
- Utilized a combination of computational modeling and experimental approaches.
- Investigated the role of geometric effects in concentrating signaling molecules.
Main Results:
- Demonstrated that geometric effects concentrate WNT9b at junctions of ureteric bud branches.
- Showed that WNT9b concentration drives renal vesicle emergence and nephron formation.
- Identified this mechanism operates even with uniform WNT9b expression in the ureteric epithelium.
Conclusions:
- Geometric effects are crucial for creating signaling gradients during kidney development.
- This mechanism of localized signaling via curvature may be a general principle in developmental biology.
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