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Clin Genet. 2019 Jun 23. doi: 10.1111/cge.13590. [Epub ahead of print]

Novel TRRAP mutation causes autosomal dominant non-syndromic hearing loss.

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Institute of Biomedical Science, Fudan University, Shanghai, China.
Department of Otorhinolaryngology, Shanghai East Hospital Ji'an Hospital, Shanghai, China.
ENT Institute and Otorhinolaryngology Department, Affiliated Eye and ENT Hospital, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China.
Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, Collaborative Innovation Center of Genetics and Development, School of Basic Medical Sciences, Fudan University, Shanghai, China.
Department of Otorhinolaryngology, Shanghai East Hospital, Tongji University, Shanghai, China.


Hereditary non-syndromic hearing loss is the most common inherited sensory defect in humans. More than 40 genes have been identified as causative genes for autosomal dominant non-syndromic hearing loss (ADNSHL), but there are many other candidate genes that remain to be discovered. We aimed to identify the causative gene mutation for post-lingual progressive ADNSHL in a Chinese family. Whole-exome sequencing, bioinformatic analysis, and Sanger sequencing were used to verify the co-segregation of a novel pathogenic variant (NM_ 001244580, c.511C>T, p.Arg171Cys) in the TRansformation/tRanscription domain-Associated Protein gene associated with hearing loss in a three-generation Chinese family with ADNSHL). Additionally, three more novel variants of transformation/transcription domain associated protein (TRRAP) were detected in 66 sporadic cases of hearing loss. Morpholino oligonucleotides knockdown and clustered regularly interspaced short palindromic repeats/Cas9 knockout zebrafish were constructed to validate the genetic findings. Knockdown or knockout of TRRAP resulted in significant defects in the inner ear of zebrafish, indicating that TRRAP plays an important role in inner ear development. In conclusion, TRRAP (NM_ 001244580, c.511C>T, p.Arg171Cys) co-segregated with hearing loss in a Chinese family with ADNSHL, and TRRAP deficiency caused hearing disability in zebrafish, suggesting TRRAP is a gene associated with ADNSHL.


TRRAP; deafness gene; non-syndromic hearing loss; zebrafish


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