A novel ENU-induced mutation in Myo6 causes vestibular dysfunction and deafness

Mouse N-ethyl-N-nitrosourea (ENU) mutagenesis has generated many useful animal models for human diseases. Here we describe the identification of a novel ENU-induced mouse mutant strain Turner (Tur) that displays circling and headtossing behavior and progressive hearing loss. Tur/Tur homozygous animals lack Preyer and righting reflexes and display severe headtossing and reaching response defect. We mapped the Tur mutation to a critical region of 11 cM on chromosome 9 that includes myosin VI. Direct sequence analysis revealed a c.820A>T substitution in exon 8 of the Myo6 gene that changes amino acid Asn200 to Ile (p.N200I) in the motor domain. Analysis of inner ear hair cells by immunohistochemistry, scanning electron microscopy and histology revealed degeneration of hair cells in the inner ear and structural malformation of the stereocilia in the cochlea of Turner homozygous mutant mice. Our data indicate that this novel mouse strain provides a useful model for future studies on the function of myosin VI in mammalian auditory and non-auditory systems and in human syndromes.published_or_final_versio

An Eya1-Notch axis specifies bipotential epibranchial differentiation in mammalian craniofacial morphogenesis

published_or_final_versio

Hoxb1 cooperates with Gli to mediate sonic hedgehog signaling in the neurogenesis of hindbrain

Hot topics 2: HT2-02 and Poster: (P-249

The roles of hedgehog receptors CDO and BOC in controlling cochlear hair cell formation

Conference Theme: The Plastic and Dynamic Auditory Syste