Dispensability of Tubulin Acetylation for 15-protofilament Microtubule Formation in the Mammalian Cochlea

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  • Renauld Justine
    GIGA-Neurosciences, Cell Biology Unit, University of Liège Department of Otolaryngology, Case Western Reserve University
  • Thelen Nicolas
    GIGA-Neurosciences, Cell Biology Unit, University of Liège
  • Bartholomé Odile
    GIGA-Neurosciences, Cell Biology Unit, University of Liège
  • Malgrange Brigitte
    GIGA-Neurosciences, Developmental Neurobiology Unit, University of Liège
  • Thiry Marc
    GIGA-Neurosciences, Cell Biology Unit, University of Liège

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<p>The development of hearing in mammals requires the formation and maturation of a highly organized and specialized epithelium known as the organ of Corti. This epithelium contains two types of cells, the sensory cells, which are the true receptors of auditory information, and the surrounding supporting cells, which are composed of a highly developed cytoskeleton essential to the architecture of the mature organ of Corti. The supporting cells are the only mammalian cells reported to contain the unusual 15-protofilament microtubules. In this paper, we show that 15-protofilament microtubules appear between the second and fourth day after birth in the pillar cells of the organ of Corti in mice. We also show that contrary to what has been described in the nematode worm Caenorhabiditis. elegans, microtubule acetylation is not essential for the formation of 15-protofilament microtubules in mice but is required for fine-tuning of their diameter.</p><p>Key words: Acetylation, cytoskeleton, microtubule, inner ear, supporting cells</p>

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