Celsr1 coordinates the planar polarity of vestibular hair cells during inner ear development.
Vestibular hair cells of the inner ear are specialized receptors that detect mechanical stimuli from gravity and motion via the deflection of a polarized bundle of stereocilia located on their apical cell surfaces. The orientation of stereociliary bundles is coordinated between neighboring cells by core PCP proteins including the large adhesive G-protein coupled receptor Celsr1. We show that mice lacking Celsr1 have vestibular behavioral phenotypes including circling. In addition, we show that Celsr1 is asymmetrically distributed at cell boundaries between hair cells and neighboring supporting cells in the developing vestibular and auditory sensory epithelia. In the absence of Celsr1 the stereociliary bundles of vestibular hair cells are misoriented relative to their neighbors, a phenotype that is greatest in the cristae of the semicircular canals. Since horizontal semi-circular canal defects lead to circling in other mutant mouse lines, we propose that this PCP phenotype is the cellular basis of the circling behavior in Celsr1 mutants.
Department of Surgery, Division of Otolaryngology, University of Utah School of Medicine, Salt Lake City, UT, USA; Department of Neurobiology & Anatomy, University of Utah School of Medicine, Salt Lake City, UT, USA.
Jeremy S
JS
Duncan
Department of Surgery, Division of Otolaryngology, University of Utah School of Medicine, Salt Lake City, UT, USA; Department of Neurobiology & Anatomy, University of Utah School of Medicine, Salt Lake City, UT, USA.
Michelle L
ML
Stoller
Department of Surgery, Division of Otolaryngology, University of Utah School of Medicine, Salt Lake City, UT, USA; Department of Neurobiology & Anatomy, University of Utah School of Medicine, Salt Lake City, UT, USA.
Andrew F
AF
Francl
Institute of Neuroscience, Université Catholique de Louvain, Brussels, Belgium.
Fadel
F
Tissir
Department of Molecular Biology, Princeton University, Princeton, NJ, USA.
Danelle
D
Devenport
Department of Surgery, Division of Otolaryngology, University of Utah School of Medicine, Salt Lake City, UT, USA; Department of Neurobiology & Anatomy, University of Utah School of Medicine, Salt Lake City, UT, USA. Electronic address: michael.deans@utah.edu.
Michael R
MR
Deans
D000818:Animals; D001522:Behavior, Animal; D016764:Cell Polarity; D007758:Ear, Inner / Q000166:cytology* / Q000196:embryology* / Q000378:metabolism; D004848:Epithelium / Q000378:metabolism; D017353:Gene Deletion; D018069:Hair Cells, Vestibular / Q000166:cytology*; D018345:Mice, Knockout; D009925:Organ of Corti / Q000166:cytology / Q000196:embryology / Q000378:metabolism; D010641:Phenotype; D043562:Receptors, G-Protein-Coupled / Q000378:metabolism*; D015398:Signal Transduction; D059547:Stereocilia / Q000378:metabolism
C117380:Celsr1 protein, mouse; D043562:Receptors, G-Protein-Coupled