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Phenotype of DFNA11: a nonsyndromic hearing loss caused by a myosin VIIA mutation.

AbstractOBJECTIVES/HYPOTHESIS:
To characterize the audiovestibular phenotype of DFNA11, an autosomal dominant nonsyndromic hearing impairment caused by a mutation in the myosin VIIA gene (MYO7A), including whether DFNA11-affected subjects have retinal degeneration as is characteristic of Usher syndrome type 1B, caused by different MYO7A mutations.
STUDY DESIGN:
Retrospective study of audiovestibular and ophthalmological data in a Japanese family linked to DFNA11.
METHODS:
Otoscopic examination and pure-tone audiometry were performed in all participants in the family. Selected subjects underwent additional examinations including speech discrimination scoring, acoustic reflex measurements, Békésy audiometry, evoked and distortion-product otoacoustic emissions, auditory brainstem responses, and bithermal caloric testing; visual acuity, ocular tonometry, slit-lamp examination, ophthalmoscopy, and electroretinography; and computed tomography of the temporal bone.
RESULTS:
Most affected individuals had moderate cochlear hearing loss beginning in the second decade and progressing at all frequencies. Variable degrees of asymptomatic vestibular dysfunction were present. Computed tomography showed normal inner and middle ear structures. No evidence suggested retinitis pigmentosa.
CONCLUSIONS:
The phenotype of DFNA11 is postlingual, nonsyndromic sensorineural hearing loss with gradual progression. Showing moderate hearing loss with asymptomatic variable vestibular dysfunction and no retinal degeneration, the DFNA11 phenotype is mildest among phenotypes caused by MYO7A mutations.
AuthorsYuya Tamagawa, Kazuhiro Ishikawa, Kotaro Ishikawa, Takashi Ishida, Ken Kitamura, Shinji Makino, Tadahiko Tsuru, Keiichi Ichimura
JournalThe Laryngoscope (Laryngoscope) Vol. 112 Issue 2 Pg. 292-7 (Feb 2002) ISSN: 0023-852X [Print] United States
PMID11889386 (Publication Type: Journal Article)
Chemical References
  • Adaptor Proteins, Signal Transducing
  • Carrier Proteins
  • DIAPH1 protein, human
  • Myosins
  • myosin VIIa
  • Dyneins
Topics
  • Adaptor Proteins, Signal Transducing
  • Adult
  • Aged
  • Audiometry
  • Carrier Proteins (genetics)
  • Disease Progression
  • Dyneins
  • Female
  • Follow-Up Studies
  • Hearing Loss, Sensorineural (diagnosis, epidemiology, genetics)
  • Humans
  • Incidence
  • Male
  • Middle Aged
  • Mutation (genetics)
  • Myosins (genetics)
  • Phenotype
  • Retrospective Studies
  • Risk Factors
  • Severity of Illness Index
  • Vestibular Function Tests

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