Journal
DEVELOPMENTAL CELL
Volume 28, Issue 5, Pages 483-496Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2014.01.021
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Funding
- March of Dimes Foundation [6-FY13-104]
- National Institutes of Health [DP2GM105448]
- Pew Foundation
- Sontag Foundation
- Intramural Research Program of the National Institutes of Health, Department of Health, and Human Services
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The Hedgehog (Hh) pathway depends on primary cilia in vertebrates, but the signaling machinery within cilia remains incompletely defined. We report the identification of a complex between two ciliary proteins, EFCAB7 and IQCE, which positively regulates the Hh pathway. The EFCAB7-IQCE module anchors the EVC-EVC2 complex in a signaling microdomain at the base of cilia. EVC and EVC2 genes are mutated in Ellis van Creveld and Weyers syndromes, characterized by impaired Hh signaling in skeletal, cardiac, and orofacial tissues. EFCAB7 binds to a C-terminal disordered region in EVC2 that is deleted in Weyers patients. EFCAB7 depletion mimics the Weyers cellular phenotype-the mislocalization of EVC-EVC2 within cilia and impaired activation of the transcription factor GLI2. Evolutionary analysis suggests that emergence of these complexes might have been important for adaptation of an ancient organelle, the cilium, for an animal-specific signaling network.
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