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Related Experiment Videos

Usher's syndrome type 3 in Finland

L Pakarinen1, S Karjalainen, K O Simola

  • 1Department of Otorhinolaryngology and Phoniatrics, Tampere University Hospital, Finland.

The Laryngoscope
|June 1, 1995
PubMed
Summary

Usher syndrome type 3 (USH3), a condition causing progressive hearing loss, is more common than previously thought. This study found USH3 in 40% of Finnish Usher syndrome patients, suggesting a higher prevalence.

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Area of Science:

  • Genetics
  • Ophthalmology
  • Audiology

Background:

  • Usher syndrome is a genetic disorder causing hearing loss and vision impairment.
  • Usher syndrome type 3 (USH3) is characterized by progressive hearing loss and later onset of retinitis pigmentosa.
  • USH3 has been considered rare, with estimates of 2% to 4% of Usher syndrome cases.

Purpose of the Study:

  • To determine the prevalence of Usher syndrome type 3 (USH3) in a Finnish population.
  • To investigate the clinical characteristics and progression of hearing loss in USH3 patients.

Main Methods:

  • A nationwide study was conducted in Finland.
  • Data were collected from 229 patients diagnosed with Usher syndrome.
  • Patients were assessed for definite USH3 and clinical evidence of earlier disease progression.

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Main Results:

  • Definite USH3 cases were identified in 30 (13%) of 229 Usher syndrome patients.
  • An additional 61 patients (27%) showed clinical evidence suggesting earlier USH3 progression.
  • A total of 91 patients (40%) were identified as potential USH3 cases.

Conclusions:

  • Usher syndrome type 3 is significantly more prevalent than previously reported.
  • The findings suggest that 40% of Usher syndrome patients in Finland may have USH3.
  • Further research is needed to confirm the diagnosis and understand the genetic basis of USH3 in this population.