Essential role of POU-domain factor Brn-3c in auditory and vestibular hair cell development

Mengqing Xiang, Lin Gan, Daqing Li, Zhi Yong Chen, Lijuan Zhou, Bert W. O'Malley, William Klein, Jeremy Nathans

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The Brn-3 subfamily of POU-domain transcription factor genes consists of three highly homologous members-Brn-3a, Brn-3b, and Brn-3c-that are expressed in sensory neurons and in a small number of brainstem nuclei. This paper describes the role of Brn-3c in auditory and vestibular system development. In the inner ear, the Brn-3c protein is found only in auditory and vestibular hair cells, and the Brn-3a and Brn-3b proteins are found only in subsets of spiral and vestibular ganglion neurons. Mice carrying a targeted deletion of the Brn-3c gene are deaf and have impaired balance. These defects reflect a complete loss of auditory and vestibular hair cells during the late embryonic and early postnatal period and a secondary loss of spiral and vestibular ganglion neurons. Together with earlier work demonstrating a loss of trigeminal ganglion neurons and retinal ganglion cells in mice carrying targeted disruptions in the Brn-3a and Brn-3b genes, respectively, the Brn- 3c phenotype reported here demonstrates that each of the Brn-3 genes plays distinctive roles in the somatosensory, visual, and auditory/vestibular systems.

Original languageEnglish (US)
Pages (from-to)9445-9450
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number17
Publication statusPublished - Aug 19 1997
Externally publishedYes



  • Inner ear development

ASJC Scopus subject areas

  • General

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