Abstract
Primary cilia are nearly ubiquitous cellular appendages that provide important sensory and signaling functions. Ciliary dysfunction underlies numerous human diseases, collectively termed ciliopathies. Primary cilia have distinct functions on different cell types and these functions are defined by the signaling proteins that localize to the ciliary membrane. Neurons throughout the mammalian brain possess primary cilia upon which certain G protein-coupled receptors localize. Yet, the precise signaling proteins present on the vast majority of neuronal cilia are unknown. Here, we report that dopamine receptor 1 (D1) localizes to cilia on mouse central neurons, thereby implicating neuronal cilia in dopamine signaling. Interestingly, ciliary localization of D1 is dynamic, and the receptor rapidly translocates to and from cilia in response to environmental cues. Notably, the translocation of D1 from cilia requires proteins mutated in the ciliopathy Bardet-Biedl syndrome (BBS), and we find that one of the BBS proteins, Bbs5, specifically interacts with D1.
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Abbreviations
- BBS:
-
Bardet-Biedl syndrome
- GPCR:
-
G protein-coupled receptor
- D1:
-
Dopamine receptor 1
- Mchr1:
-
Melanin-concentrating hormone receptor 1
- Sstr3:
-
Somatostatin receptor 3
- ACIII:
-
Type III adenylyl cyclase
- IMCD:
-
Inner medullary collecting duct
- i3:
-
Third intracellular
- C-tail:
-
Carboxy terminal tail
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Acknowledgments
We are grateful to Joshua Stowell for technical assistance and David Sibley (NINDS) for providing D1 WT and KO brains. This work was supported in part by the Systems and Integrative Biology Training Grant T32 GM068412(J.G.) and R01 GM083120 from the NIH/National Institute of General Medical Sciences (K.M.).
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Domire, J.S., Green, J.A., Lee, K.G. et al. Dopamine receptor 1 localizes to neuronal cilia in a dynamic process that requires the Bardet-Biedl syndrome proteins. Cell. Mol. Life Sci. 68, 2951–2960 (2011). https://doi.org/10.1007/s00018-010-0603-4
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DOI: https://doi.org/10.1007/s00018-010-0603-4