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Schmidts, Miriam; Vodopiutz, Julia; Christou-Savina, Sonia; Cortés, Claudio R.; McInerney-Leo, Aideen M.; Emes, Richard D.; Arts, Heleen H.; Tüysüz, Beyhan; D’Silva, Jason; Leo, Paul J.; Giles, Tom C.; Oud, Machteld M.; Harris, Jessica A.; Koopmans, Marije; Marshall, Mhairi; Elçioglu, Nursel; Kuechler, Alma; Bockenhauer, Detlef; Moore, Anthony T.; Wilson, Louise C.; Janecke, Andreas R.; Hurles, Matthew E.; Emmet, Warren; Gardiner, Brooke; Streubel, Berthold; Dopita, Belinda; Zankl, Andreas; Kayserili, Hülya; Scambler, Peter J.; Brown, Matthew A.; Beales, Philip L.; Wicking, Carol; Duncan, Emma L.; Mitchison, Hannah M.
American journal of human genetics, 11/2013, Volume: 93, Issue: 5Journal Article
Bidirectional (anterograde and retrograde) motor-based intraflagellar transport (IFT) governs cargo transport and delivery processes that are essential for primary cilia growth and maintenance and for hedgehog signaling functions. The IFT dynein-2 motor complex that regulates ciliary retrograde protein transport contains a heavy chain dynein ATPase/motor subunit, DYNC2H1, along with other less well functionally defined subunits. Deficiency of IFT proteins, including DYNC2H1, underlies a spectrum of skeletal ciliopathies. Here, by using exome sequencing and a targeted next-generation sequencing panel, we identified a total of 11 mutations in WDR34 in 9 families with the clinical diagnosis of Jeune syndrome (asphyxiating thoracic dystrophy). WDR34 encodes a WD40 repeat-containing protein orthologous to Chlamydomonas FAP133, a dynein intermediate chain associated with the retrograde intraflagellar transport motor. Three-dimensional protein modeling suggests that the identified mutations all affect residues critical for WDR34 protein-protein interactions. We find that WDR34 concentrates around the centrioles and basal bodies in mammalian cells, also showing axonemal staining. WDR34 coimmunoprecipitates with the dynein-1 light chain DYNLL1 in vitro, and mining of proteomics data suggests that WDR34 could represent a previously unrecognized link between the cytoplasmic dynein-1 and IFT dynein-2 motors. Together, these data show that WDR34 is critical for ciliary functions essential to normal development and survival, most probably as a previously unrecognized component of the mammalian dynein-IFT machinery.
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