Study of Usher Syndromes, Type 1 and Type 2

NCT00001347 | Completed

• 2 other identifiers: 93016193-EI-0161
• Study Type: observational
• Target: 200
• Locations: 1 country
• Sites: 1

Brief Summary

The purpose of this investigation is to gain additional knowledge about what causes type 1 and type 2 Usher syndrome-inherited diseases that can cause balance problems and impaired hearing and vision-and to develop better diagnostic tests. Patients with type 1 Usher syndrome usually are deaf from birth and have speech and balance problems. Patients with type 2 disease generally are hearing impaired but have no balance problems. All patients develop eye problems that cause difficulty seeing in the dark. The development of newer and more sophisticated diagnostic tests may detect subtle differences in signs and symptoms that allow more accurate distinction between the two types of Usher syndrome. This study will use these tests to classify these syndromes and eventually identify the genes responsible for them. Study participants will have a medical and family history taken and a family tree constructed. They will undergo a thorough eye examination, including special tests of color vision, field of vision, and ability to see in the dark. An electroretinogram will be done to measure the function of cells in the retina, and a procedure called fluorescein angiography will be done to look at and photograph the blood vessels in the retina. Special hearing and balance tests will also done. Hearing tests include physical examination of the ears and wearing earphones while listening to tones. Balance and coordination tests require tasks such as walking in a straight line and standing in the dark with eyes closed. A caloric stimulation test will also be done, in which a small amount of water is irrigated into the ear canal. For gene studies, blood samples will be collected from patients and all available family members.

Conditions

Retinitis Pigmentosa

Keywords

Linkage Analysis; Genomic DNA; Pedigree Analysis; Usher Syndrome; Usher Syndrome Type 1; Usher Syndrome Type 2

Eligibility Criteria

• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• Patients must have documentation of neurosensory hearing loss and retinitis pigmentosa and fulfill the clinical characteristics (Table) as accepted for USH 1 and USH 2.
• The minimal test battery will identify all patients with USH 1 and USH 2 as well as possible subtypes.
• Candidates will be recruited from lists of patients willing to participate in research studies compiled by the R.P. Foundation, and by referral from their private physicians.
• On occasion additional family members will be studied after an initial individual is ascertained as above.

Sponsors & Collaborators

• National Eye Institute (NEI): lead

Study Sites (1)

National Eye Institute (NEI)

Bethesda, Maryland, 20892, United States

Location

Related Publications (3)

• Lewis RA, Otterud B, Stauffer D, Lalouel JM, Leppert M. Mapping recessive ophthalmic diseases: linkage of the locus for Usher syndrome type II to a DNA marker on chromosome 1q. Genomics. 1990 Jun;7(2):250-6. doi: 10.1016/0888-7543(90)90547-8.

  PMID: 1971808 BACKGROUND

• Kimberling WJ, Moller CG, Davenport S, Priluck IA, Beighton PH, Greenberg J, Reardon W, Weston MD, Kenyon JB, Grunkemeyer JA, et al. Linkage of Usher syndrome type I gene (USH1B) to the long arm of chromosome 11. Genomics. 1992 Dec;14(4):988-94. doi: 10.1016/s0888-7543(05)80121-1.

  PMID: 1478677 BACKGROUND

• Smith RJ, Lee EC, Kimberling WJ, Daiger SP, Pelias MZ, Keats BJ, Jay M, Bird A, Reardon W, Guest M, et al. Localization of two genes for Usher syndrome type I to chromosome 11. Genomics. 1992 Dec;14(4):995-1002. doi: 10.1016/s0888-7543(05)80122-3.

  PMID: 1478678 BACKGROUND

MeSH Terms

Conditions

Retinitis Pigmentosa; Usher Syndromes

Condition Hierarchy (Ancestors)

Eye Diseases, Hereditary; Eye Diseases; Retinal Dystrophies; Retinal Degeneration; Retinal Diseases; Genetic Diseases, Inborn; Congenital, Hereditary, and Neonatal Diseases and Abnormalities; Deaf-Blind Disorders; Deafness; Hearing Loss; Hearing Disorders; Ear Diseases; Otorhinolaryngologic Diseases; Hearing Loss, Sensorineural; Sensation Disorders; Neurologic Manifestations; Nervous System Diseases; Blindness; Vision Disorders; Abnormalities, Multiple; Congenital Abnormalities; Signs and Symptoms; Pathological Conditions, Signs and Symptoms

Study Design

• Study Type: observational
• Sponsor Type: NIH

Study Record Dates

• First Submitted: November 3, 1999
• First Posted: November 4, 1999
• Study Start: June 1, 1993
• Study Completion: August 1, 2002
• Last Updated: March 4, 2008

Record last verified: 2002-08

Locations

US (1)