DYRK2 is a ciliary kinase involved 1 in vertebrate Hedgehog signal transduction
Morante, N.; Sigg, M. A.; Strauskulage, L.; Raleigh, D. R.; Reiter, J. F.
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Primary cilia are organelles specialized for signaling. We previously defined the proteomes of sea urchin and sea anemone cilia to identify ciliary proteins that predate the origin of bilateria. This evolutionary perspective on cilia identified DYRK2, a kinase not been previously implicated in ciliary biology. We found that DYRK2 localizes to cilia and that loss of DYRK2 disrupts ciliary morphology. We also found that DYRK2 participates in ciliary Hh signal transduction, communicating between SMO and GLI transcription factors. Mutation of mouse Dyrk2 resulted in skeletal defects reminiscent of those caused by loss of Indian hedgehog (Ihh). Like Dyrk2 mutations, pharmacological inhibition of DYRK2 dysregulates ciliary length control and attenuates Hedgehog signaling. Thus, DYRK2 is required for ciliary morphology, for Hedgehog signaling in vitro, and for skeletal development. We propose that DYRK2 is part of the mechanism that transduces SMO to activate GLI transcription factors within cilia.
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