Journal
ANNALS OF OTOLOGY RHINOLOGY AND LARYNGOLOGY
Volume 124, Issue -, Pages 184S-192SPublisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0003489415575041
Keywords
hearing loss; PTPRQ; DFNB84; massively parallel DNA sequencing
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Funding
- NIDCD [RO1s DC003544, DC002842, DC012049]
- Health and Labour Sciences Research Grant for Research on Rare and Intractable Diseases and Comprehensive Research on Disability Health and Welfare from the Ministry of Health, Labour and Welfare of Japan
- Ministry of Education, Science and Culture of Japan
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Objectives: We present 3 patients with congenital sensorineural hearing loss (SNHL) caused by novel PTPRQ mutations, including clinical manifestations and phenotypic features. Methods: Two hundred twenty (220) Japanese subjects with SNHL from unrelated and nonconsanguineous families were enrolled in the study. Targeted genomic enrichment with massively parallel DNA sequencing of all known nonsyndromic hearing loss genes was performed to identify the genetic cause of hearing loss. Results: Four novel causative PTPRQ mutations were identified in 3 cases. Case I had progressive profound SNHL with a homozygous nonsense mutation. Case 2 had nonprogressive profound SNHL with a compound heterozygous mutation (nonsense and missense mutation). Case 3 had nonprogressive moderate SNHL with a compound heterozygous mutation (missense and splice site mutation). Caloric test and vestibular evoked myogenic potential (VEMP) test showed vestibular dysfunction in Case I. Conclusion: Hearing loss levels and progression among the present cases were varied, and there seem to be no obvious correlations between genotypes and the phenotypic features of their hearing loss. The PTPRQ mutations appeared to be responsible for vestibular dysfunction.
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