A molecular basis for water motion detection by the mechanosensory lateral line of zebrafish

Shih-Wei Chou, Zongwei Chen, Shaoyuan Zhu, Robin W. Davis, Jiaqi Hu, Li Liu, Carol A. Fernando, Kayla Kindig, William C. Brown, Ruben Stepanyan and Brian M. McDermott ()
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Shih-Wei Chou: Case Western Reserve University School of Medicine
Zongwei Chen: Case Western Reserve University School of Medicine
Shaoyuan Zhu: Case Western Reserve University School of Medicine
Robin W. Davis: Case Western Reserve University School of Medicine
Jiaqi Hu: Case Western Reserve University School of Medicine
Li Liu: Case Western Reserve University School of Medicine
Carol A. Fernando: Case Western Reserve University School of Medicine
Kayla Kindig: Case Western Reserve University School of Medicine
William C. Brown: Case Western Reserve University School of Medicine
Ruben Stepanyan: Case Western Reserve University School of Medicine
Brian M. McDermott: Case Western Reserve University School of Medicine

Nature Communications, 2017, vol. 8, issue 1, 1-16

Abstract: Abstract Detection of water motion by the lateral line relies on mechanotransduction complexes at stereocilia tips. This sensory system is comprised of neuromasts, patches of hair cells with stereociliary bundles arranged with morphological mirror symmetry that are mechanically responsive to two opposing directions. Here, we find that transmembrane channel-like 2b (Tmc2b) is differentially required for mechanotransduction in the zebrafish lateral line. Despite similarities in neuromast hair cell morphology, three classes of these cells can be distinguished by their Tmc2b reliance. We map mechanosensitivity along the lateral line using imaging and electrophysiology to determine that a hair cell’s Tmc2b dependence is governed by neuromast topological position and hair bundle orientation. Overall, water flow is detected by molecular machinery that can vary between hair cells of different neuromasts. Moreover, hair cells within the same neuromast can break morphologic symmetry of the sensory organ at the stereocilia tips.

Date: 2017
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DOI: 10.1038/s41467-017-01604-2

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