CEP41 is mutated in Joubert syndrome and is required for tubulin glutamylation at the cilium |
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| Authors: | Lee Ji Eun Silhavy Jennifer L Zaki Maha S Schroth Jana Bielas Stephanie L Marsh Sarah E Olvera Jesus Brancati Francesco Iannicelli Miriam Ikegami Koji Schlossman Andrew M Merriman Barry Attié-Bitach Tania Logan Clare V Glass Ian A Cluckey Andrew Louie Carrie M Lee Jeong Ho Raynes Hilary R Rapin Isabelle Castroviejo Ignacio P Setou Mitsutoshi Barbot Clara Boltshauser Eugen Nelson Stanley F Hildebrandt Friedhelm Johnson Colin A Doherty Daniel A Valente Enza Maria Gleeson Joseph G |
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| Institution: | Department of Neurosciences, Howard Hughes Medical Institute, University of California, San Diego, La Jolla, California, USA. |
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| Abstract: | Tubulin glutamylation is a post-translational modification that occurs predominantly in the ciliary axoneme and has been suggested to be important for ciliary function. However, its relationship to disorders of the primary cilium, termed ciliopathies, has not been explored. Here we mapped a new locus for Joubert syndrome (JBTS), which we have designated as JBTS15, and identified causative mutations in CEP41, which encodes a 41-kDa centrosomal protein. We show that CEP41 is localized to the basal body and primary cilia, and regulates ciliary entry of TTLL6, an evolutionarily conserved polyglutamylase enzyme. Depletion of CEP41 causes ciliopathy-related phenotypes in zebrafish and mice and results in glutamylation defects in the ciliary axoneme. Our data identify CEP41 mutations as a cause of JBTS and implicate tubulin post-translational modification in the pathogenesis of human ciliary dysfunction. |
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