TALPID3 controls centrosome and cell polarity and the human ortholog KIAA0586 is mutated in Joubert syndrome (JBTS23)

• Published in: eLife Vol. 4
• Main Authors: Stephen, Louise A, Tawamie, Hasan, Davis, Gemma M, Tebbe, Lars, Nürnberg, Peter, Nürnberg, Gudrun, Thiele, Holger, Thoenes, Michaela, Boltshauser, Eugen, Uebe, Steffen, Rompel, Oliver, Reis, André, Ekici, Arif B, McTeir, Lynn, Fraser, Amy M, Hall, Emma A, Mill, Pleasantine, Daudet, Nicolas, Cross, Courtney, Wolfrum, Uwe, Jamra, Rami Abou, Davey, Megan G, Bolz, Hanno J
• Format: Journal Article
• Language: English
• Published: England eLife Sciences Publications, Ltd 19.09.2015; eLife Sciences Publications Ltd
• Subjects: Abnormalities, Multiple - genetics; Animals; Cell Cycle Proteins - genetics; Cell Polarity; centrosome; Centrosome - metabolism; Cerebellum - abnormalities; ciliopathy; Developmental Biology and Stem Cells; Disease Models, Animal; Eye Abnormalities - genetics; Human Biology and Medicine; Humans; Joubert syndrome; KIAA0586; Kidney Diseases, Cystic - genetics; Mice; Mutation; Retina - abnormalities; Talpid3; human biology; stem cells; chicken; Joubert syndrome; developmental biology; medicine; centrosome; ciliopathy; Talpid3; mouse; KIAA0586; cell polarity; human
• ISSN: 2050-084X; 2050-084X
• DOI: 10.7554/elife.08077

Joubert syndrome (JBTS) is a severe recessive neurodevelopmental ciliopathy which can affect several organ systems. Mutations in known JBTS genes account for approximately half of the cases. By homozygosity mapping and whole-exome sequencing, we identified a novel locus, JBTS23, with a homozygous splice site mutation in KIAA0586 (alias TALPID3), a known lethal ciliopathy locus in model organisms. Truncating KIAA0586 mutations were identified in two additional patients with JBTS. One mutation, c.428delG (p.Arg143Lysfs*4), is unexpectedly common in the general population and may be a major contributor to JBTS. We demonstrate KIAA0586 protein localization at the basal body in human and mouse photoreceptors, as is common for JBTS proteins, and also in pericentriolar locations. We show that loss of TALPID3 (KIAA0586) function in animal models causes abnormal tissue polarity, centrosome length and orientation, and centriolar satellites. We propose that JBTS and other ciliopathies may in part result from cell polarity defects.