Journal
NATURE GENETICS
Volume 43, Issue 8, Pages 776-U88Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ng.891
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Funding
- National Science Foundation
- National Institute for General Medical Sciences-Initiative for Maximizing Student Diversity [R25-GM56847]
- US National Institutes of Health [HD04260, DK072301, DK075972, DK1069274, DK1068306, RC4-K090917, AR054396]
- March of Dimes
- Burroughs Wellcome Fund
- Packard Foundation
- Sandler Family Supporting Foundation
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Mutations affecting ciliary components cause ciliopathies. As described here, we investigated Tectonic1 (Tctn1), a regulator of mouse Hedgehog signaling, and found that it is essential for ciliogenesis in some, but not all, tissues. Cell types that do not require Tctn1 for ciliogenesis require it to localize select membrane-associated proteins to the cilium, including Arl13b, AC3, Smoothened and Pkd2. Tctn1 forms a complex with multiple ciliopathy proteins associated with Meckel and Joubert syndromes, including Mks1, Tmem216, Tmem67, Cep290, B9d1, Tctn2 and Cc2d2a. Components of this complex co-localize at the transition zone, a region between the basal body and ciliary axoneme. Like Tctn1, loss of Tctn2, Tmem67 or Cc2d2a causes tissue-specific defects in ciliogenesis and ciliary membrane composition. Consistent with a shared function for complex components, we identified a mutation in TCTN1 that causes Joubert syndrome. Thus, a transition zone complex of Meckel and Joubert syndrome proteins regulates ciliary assembly and trafficking, suggesting that transition zone dysfunction is the cause of these ciliopathies.
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