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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
Inversin, Wnt signaling and primary cilia.
Differentiation; Research in Biological Diversity 2012 Februrary
Mutations of the ankyrin-repeat protein Inversin, a member of a diverse family of more than 12 proteins, cause nephronophthisis (NPH), an autosomal recessive cystic kidney disease associated with extra-renal manifestations such as retinitis pigmentosa, cerebellar aplasia and situs inversus. Most NPH gene products (NPHPs) localize to the cilium, and appear to control the transport of cargo protein to the cilium by forming functional networks. Inversin interacts with NPHP1 and NPHP3, and shares with NPHP4 the ability to antagonize Dishevelled-stimulated canonical Wnt signaling, potentially through recruitment of the Anaphase Promoting Complex (APC/C). However, Dishevelled antagonism may be confined towards the basal body, thereby polarizing motile cilia on the cells of the ventral node and respiratory tract. Inversin is essential for recruiting Dishevelled to the plasma membrane in response to activated Frizzled, a crucial step in planar cell polarity signaling. During vertebrate pronephros development, the Inversin-mediated translocation of Dishevelled appears to orchestrate the migration of cells and differentiation of segments that correspond to the mammalian loop of Henle. Thus, defective tubule migration and elongation may contribute to concentration defects and cause cyst formation in patients with NPH.
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