Abstract
What is the role of normally patterned sensory signaling in development of vestibular circuits? For technical reasons, including the difficulty in depriving animals of vestibular inputs, this has been a challenging question to address. Here we take advantage of a vestibular-deficient zebrafish mutant, rock solo AN66, in order to examine whether normal sensory input is required for formation of vestibular-driven postural circuitry. We show that the rock solo AN66 mutant is a splice site mutation in the secreted glycoprotein otogelin (otog), which we confirm through both whole genome sequencing and complementation with an otog early termination mutant. Using confocal microscopy, we find that elements of postural circuits are anatomically normal in rock solo AN66 mutants, including hair cells, vestibular ganglion neurons, and vestibulospinal neurons. Surprisingly, the balance and postural deficits that are readily apparent in younger larvae disappear around 2 weeks of age. We demonstrate that this behavioral recovery follows the delayed development of the anterior (utricular) otolith, which appears around 14 days post-fertilization (dpf), compared to 1 dpf in WT. These findings indicate that utricular signaling is not required for normal structural development of the inner ear and vestibular nucleus neurons. Furthermore, despite the otolith’s developmental delay until well after postural behaviors normally appear, downstream circuits can drive righting reflexes within ∼1–2 days of its arrival, indicating that vestibular circuit wiring is not impaired by a delay in patterned activity. The functional recovery of postural behaviors may shed light on why humans with mutations in otog exhibit only subclinical vestibular deficits.





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Acknowledgements
The authors are grateful to Dr. Teresa Nicolson for sharing the rock solo line, Dr. Mark Warchol for the otoferlin antibody and protocol, and to Dr. Rebecca Callahan for critical feedback on the manuscript. Funding for this research was provided by the National Institute for Deafness and Other Communication Disorders (R00DC012536); by the Pew Scholars Program; and by an Alfred P. Sloan Fellowship to M.W.B.
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Richard Roberts and Jeffrey Elsner contributed equally to the manuscript.
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Video 1
(Rocksolo_14dpf_abnormalswim.avi) presents a high-speed video (500 frames/s) of a otog c.1522+2T>A animal swimming abnormally on the first day of utricular otolith appearance. 45 ° mirrors to reflect a side view can be seen in the upper and lower left of the image. The animal is initially side-lying; after being touched gently with a plastic probe, it turns and swims entirely upside-down (note the ventral swim bladder can be seen on the upper surface in the mirror views) before eventually rolling back to side-lying. The entire video is 480 ms long. (M4V 1531 kb)
Video 2
(Rocksolo_15dpf_normalswim.avi) presents the same animal as in Video 1, 1 day later. Three swim episodes are shown with brief periods of quiescence in between removed. The animal swims normally (dorsal up) for both spontaneous and light touch-evoked swims. The swim bladder can be seen in side mirror view clearly on the underside of the animal. The video is 746 ms long. (M4V 2568 kb)
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Roberts, R., Elsner, J. & Bagnall, M.W. Delayed Otolith Development Does Not Impair Vestibular Circuit Formation in Zebrafish. JARO 18, 415–425 (2017). https://doi.org/10.1007/s10162-017-0617-9
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DOI: https://doi.org/10.1007/s10162-017-0617-9

