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OSBPL2 encodes a protein of inner and outer hair cell stereocilia and is mutated in autosomal dominant hearing loss (DFNA67)

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Michaela Thoenes, Ulrike Zimmermann, Inga Ebermann, Martin Ptok, Morag A. Lewis, Holger Thiele, Susanne Morlot, Markus M. Hess, Andreas Gal, Tobias Eisenberger, Carsten Bergmann, Gudrun Nürnberg, Peter Nürnberg, Karen P. Steel, Marlies Knipper, Hanno Jörn Bolz

Original languageEnglish
Article number15
JournalOrphanet Journal of Rare Diseases
Issue number1
Publication statusPublished - 10 Feb 2015


  • OSBPL2 encodes a protein_THOENES_Accepted 3Feb2015_GOLD VoR

    OSBPL2_encodes_a_protein_THOENES_Accepted_3Feb2015_GOLD_VoR.pdf, 1 MB, application/pdf


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    This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.

King's Authors


Background: Early-onset hearing loss is mostly of genetic origin. The complexity of the hearing process is reflected by its extensive genetic heterogeneity, with probably many causative genes remaining to be identified. Here, we aimed at identifying the genetic basis for autosomal dominant non-syndromic hearing loss (ADNSHL) in a large German family. Methods: A panel of 66 known deafness genes was analyzed for mutations by next-generation sequencing (NGS) in the index patient. We then conducted genome-wide linkage analysis, and whole-exome sequencing was carried out with samples of two patients. Expression of Osbpl2 in the mouse cochlea was determined by immunohistochemistry. Because Osbpl2 has been proposed as a target of miR-96, we investigated homozygous Mir96 mutant mice for its upregulation. Results: Onset of hearing loss in the investigated ADNSHL family is in childhood, initially affecting the high frequencies and progressing to profound deafness in adulthood. However, there is considerable intrafamilial variability. We mapped a novel ADNSHL locus, DFNA67, to chromosome 20q13.2-q13.33, and subsequently identified a co-segregating heterozygous frameshift mutation, c.141-142delTG (p.Arg50Alafs103), in OSBPL2, encoding a protein known to interact with the DFNA1 protein, DIAPH1. In mice, Osbpl2 was prominently expressed in stereocilia of cochlear outer and inner hair cells. We found no significant Osbpl2 upregulation at the mRNA level in homozygous Mir96 mutant mice. Conclusion: The function of OSBPL2 in the hearing process remains to be determined. Our study and the recent description of another frameshift mutation in a Chinese ADNSHL family identify OSBPL2 as a novel gene for progressive deafness.

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