The novel linkage between Fuz and Gpr161 genes regulates sonic hedgehog signaling during mouse embryonic development.
Kim, S. E.; Kim, H. Y.; Wlodarczyk, B. J.; Finnell, R. H.
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Sonic hedgehog (Shh) signaling regulates embryonic morphogenesis utilizing primary cilia, the cell antenna acting as a signaling hub. Fuz, an effector of planar cell polarity (PCP) signaling, involves Shh signaling via cilia formation, while the G protein-coupled receptor 161 (Gpr161) is a negative regulator of Shh signaling. The range of phenotypic malformations observed in mice bearing mutations in either of these two genes is similar; however, their functional relations have not been previously explored. This study identified the genetic and biochemical link between Fuz and Gpr161 in mouse embryonic development. Fuz was genetically epistatic to Gpr161 via Shh signaling during mouse embryonic development. The FUZ biochemically interacted with GPR161, and Fuz regulated Gpr161 ciliary trafficking via {beta}-arrestin2. Our study suggested the novel Gpr161-Fuz axis that regulates Shh signaling during mouse embryonic development. Summary statementThis study illuminates the novel genetic and biochemical linkages between Fuz and Gpr161 to regulate sonic hedgehog signaling during mouse embryonic development.
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