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Nat Genet June 21, 2009; 41 (7): 793-9.

Wnt9b signaling regulates planar cell polarity and kidney tubule morphogenesis.

Karner CM , Chirumamilla R , Aoki S , Igarashi P , Wallingford JB , Carroll TJ .

Although many vertebrate organs, such as kidneys, lungs and liver, are composed of epithelial tubules, little is known of the mechanisms that establish the length or diameter of these tubules. In the kidney, defects in the establishment or maintenance of tubule diameter are associated with one of the most common inherited human disorders, polycystic kidney disease. Here we show that attenuation of Wnt9b signaling during kidney morphogenesis affects the planar cell polarity of the epithelium and leads to tubules with significantly increased diameter. Although previous studies showed that polarized cell divisions maintain the diameter of postnatal kidney tubules, we find that cell divisions are randomly oriented during embryonic development. Our data suggest that diameter is established during early morphogenetic stages by convergent extension processes and maintained by polarized cell divisions. Wnt9b, signaling through the non-canonical Rho/Jnk branch of the Wnt pathway, is necessary for both of these processes.

PubMed ID: 19543268
PMC ID: PMC2761080
Article link: Nat Genet

Species referenced: Xenopus laevis
Genes referenced: axin2 cdh1 cdkn2b ctnnb1 dvl2 epha8 mapk9 prkci rho rho.2 wnt4 wnt7b wnt9b

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References [+] :
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