Healthy Clinical Trial - Genetic Studies of Tone Deafness

Status Completed

Clinical Trial Summary

This study will examine the hereditary basis of tone deafness by identifying regions of the human genome linked to this condition. Both exceptionally good pitch recognition (perfect pitch) and exceptionally poor pitch recognition (tone deafness) run in families. A better understanding of what causes tone deafness may provide new insights into auditory (hearing) function.

Individuals with two or more family members 15 years of age or older who are tone deaf or have trouble recognizing different melodies may be eligible for this study. Candidates will be screened with a short listening test for pitch and a short written test. Those identified with poor pitch recognition will fill out a brief questionnaire about their family tree and family members (without identifying names) who have trouble recognizing melodies or tones. Individuals with poor pitch recognition will be asked to help contact family members who may be interested in participating.

Members of families with two or more first-degree relatives (parents, grandparents, siblings) who are tone deaf may enroll in the study. They will provide a blood sample (about 2 tablespoons) for genetic studies and may take a 20-minute hearing test using headphones.

Clinical Trial Description

The primary goal of this study is to identify regions of the genome which show genetic linkage to deficits in pitch recognition. Pitch recognition in subjects will be tested to identify individuals and families with poor pitch recognition, known as tune deafness, defined as the inability to recognize wrong notes in a popular melody. We will undertake a 2-stage process, first a screening to identify probands, and secondly a full family ascertainment and enrollment. Probands and family members will be given an auditory and verbal attention test, and additions listening tests to measure aspects of center auditory processing and attention. Family phenotypic data will be used for additional epidemiological studies of tune deafness. Affected and unaffected members of families containing multiple tune deaf individuals will have 20 cc of blood drawn to obtain DNA. These DNA samples will then be genotyped using markers distributed across the human genome, and the genotypic information analyzed to determine which markers show linkage to tune deafness. Genetic linkage is the initial step in the process of positional cloning, and cloning the defective genes which underlie tune deafness is a long term goal of this research. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT00006076
Study type	Observational
Source	National Institutes of Health Clinical Center (CC)
Contact
Status	Completed
Phase	N/A
Start date	July 26, 2000
Completion date	June 29, 2010

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.