We updated the design of this site on December 18, 2017. Learn more.
ClinicalTrials.gov Menu
Trial record 7 of 24 for:    Recruiting, Not yet recruiting, Available Studies | "Vestibular Diseases"

Genetic Analysis of Hereditary Disorders of Hearing and Balance

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00023049
Recruitment Status : Recruiting
First Posted : August 22, 2001
Last Update Posted : October 19, 2017
Information provided by (Responsible Party):

Study Description
Brief Summary:

This study will try to identify the genetic causes of hereditary hearing loss or balance disorders.

People with a hearing or balance disorder that affects more than one family member may be eligible for this study. They and their immediate family members may undergo some or all of the following procedures:

  • Medical and family history, including questions about hearing, balance and other ear-related issues, and review of medical records.
  • Routine physical examination.
  • Blood draw or buccal swab (brushing inside the cheek to collect cells) Tissue is collected for DNA analysis to look for changes in genes that may be related to hearing loss.
  • Hearing tests The subject listens for tones emitted through a small earphone.
  • Balance tests to see if balance functions of the inner ear are associated with the hearing loss In one test the subject wears goggles and watches moving lights while cold or warm air is blown into the ears. A second test involves sitting in a spinning chair in a quiet, dark room.
  • Photograph A photograph may be taken as a record of eye shape and color, distance between the eyes, and hair color.
  • Computed tomography (CT) and magnetic resonance imaging (MRI) scans These tests show the structure of the inner ear. For CT, the subject lies still for a short time while X-ray images are obtained. For MRI, the patient lies on a stretcher that is moved into a cylindrical machine with a strong magnetic field. The magnetic field and radio waves produce images of the inner ear. The radio waves cause loud thumping noises that can be muffled by the use of earplugs.

Condition or disease
Sensorineural Hearing Loss Hearing Disorder Vestibular Disease

Detailed Description:
Hereditary hearing impairment is a genetically heterogeneous disorder that can be caused by mutations in any one of hundreds of different genes. Approximately 20 genes have now been identified in which mutations can cause nonsyndromic sensorineural hearing loss. The identification and analysis of these genes and their mutations are providing critical insights into the development, structure, and function of the auditory system, as well as the molecular mechanisms associated with disruption of these processes. In contrast, the molecular mechanisms underlying familial disorders affecting peripheral vestibular function appear to be more rare, have not been well described, and are less well understood. The peripheral auditory and vestibular systems share many common features in both health and disease, and many hereditary hearing loss disorders also affect vestibular function. The purpose of this study is to identify genes and mutations causing hereditary disorders of hearing, balance, or both. Members of families segregating hereditary disorders of hearing or balance will be enrolled in the proposed study in order to: (1) define and characterize the phenotypes and natural histories; (2) identify the underlying causative mutations and genes by linkage, positional cloning, and/or candidate gene mutation analyses; (3) and correlate observed phenotypes with the corresponding mutations and functions of the underlying genes.

Study Design

Study Type : Observational
Estimated Enrollment : 750 participants
Time Perspective: Other
Official Title: Genetic Analysis of Hereditary Disorders of Hearing and Balance
Study Start Date : August 20, 2001

Resource links provided by the National Library of Medicine

U.S. FDA Resources

Groups and Cohorts

Outcome Measures

Eligibility Criteria

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Ages Eligible for Study:   up to 99 Years   (Child, Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Persons with known SNHL and/or peripheral vestibular dysfunctions caused by genetic etiology

Family members of persons with known SNHL and/or peripheral vestibular dysfunction caused by genetic etiology

Adults must be able to provide informed consent

Minors must have a parent or guardian able to provide informed consent

Subjects must be 0-99 years of age

For Nigeria subjects with non-syndromic hearing loss, their hearing loss must be early-onset, before 10 years of age, to be eligible.


Persons with SNHL and/or peripheral vestibular dysfunction caused by a nongenetic etiology such as trauma, infection, metabolic or immunologic disorders, or exposure to ototoxic agents such as noise or aminoglycoside antibiotics will not be included in this protocol.

Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00023049

Contact: Andrew J Griffith, M.D. (301) 402-2829 griffita@mail.nih.gov

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike Recruiting
Bethesda, Maryland, United States, 20892
Contact: For more information at the NIH Clinical Center contact Patient Recruitment and Public Liaison Office (PRPL)    800-411-1222 ext TTY8664111010    prpl@mail.cc.nih.gov   
Institute of Child Health, College of Medicine, University of Ibadan Recruiting
Ibadan, Nigeria
Contact: Andrew Griffith, M.D.    (301) 496-1960    griffita@mail.nih.gov   
Sponsors and Collaborators
National Institute on Deafness and Other Communication Disorders (NIDCD)
Principal Investigator: Andrew J Griffith, M.D. National Institute on Deafness and Other Communication Disorders (NIDCD)
More Information

Additional Information:
Responsible Party: National Institute on Deafness and Other Communication Disorders (NIDCD)
ClinicalTrials.gov Identifier: NCT00023049     History of Changes
Other Study ID Numbers: 010229
First Posted: August 22, 2001    Key Record Dates
Last Update Posted: October 19, 2017
Last Verified: August 22, 2017

Keywords provided by National Institutes of Health Clinical Center (CC) ( National Institute on Deafness and Other Communication Disorders (NIDCD) ):
Hereditary Hearing Disorder
Hearing Impairment
Sensorineural Hearing Loss
Vestibular Dysfunction

Additional relevant MeSH terms:
Vestibular Diseases
Hearing Loss
Hearing Loss, Sensorineural
Hearing Disorders
Pathologic Processes
Ear Diseases
Otorhinolaryngologic Diseases
Sensation Disorders
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms
Labyrinth Diseases