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Journal Article
Research Support, Non-U.S. Gov't
The Inv compartment of renal cilia is an intraciliary signal-activating center to phosphorylate ANKS6.
Kidney International 2018 May
Connections between cilia and renal cystic diseases are well known, yet molecular mechanisms remain undefined. Cysto-proteins localized in the Inv compartment of cilia (INV, NPHP3, NEK8, and ANKS6) constitute a distinct group. Here we created and analyzed mutant mice (G2A mice) with a defective cilia localization signal in the Nphp3 gene. Mutant NPHP3 was absent the binding capacity of UNC119, a carrier protein responsible for the delivery of myristoylated cargo to the cilium, so ciliary localization was reduced or lost in the kidney but not in the embryonic node. Mutant mice developed renal cysts but not situs abnormalities. Although ciliary localization of INV, NEK8, and ANKS6 did not change in the kidneys of Nphp3 mutant mice, ANKS6 phosphorylation was impaired. In general, ANKS6 levels decrease with age in the kidneys of wild-type mice. However, cystic kidneys in G2A and Inv mice maintained high levels of a non-phosphorylated form of ANKS6. We found INV and NPHP3 cooperate and promote ANKS6 phosphorylation by NEK8 in renal cilia. Thus, there is a novel signaling path from cilia in which ANKS6 functions as a signal mediator and link between cilia and the cytoplasm to regulate kidney morphogenesis.
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