Genetic Linkage Studies of Stuttering
- Conditions
- Stuttering
- Registration Number
- NCT00001604
- Lead Sponsor
- National Institute on Deafness and Other Communication Disorders (NIDCD)
- Brief Summary
Stuttering is an abnormality in speech that affects the rhythm of speech. People who stutter know what they wish to say, but at the time are unable to say it because of involuntary repetition, unnecessary lengthening (prolongation), or early stopping (cessation). Stuttering is characterized by repetitions or prolongation of the first syllable, or silent prolongations, sometimes known as blocks.
Researcher intend on studying the genetic basis for stuttering. The goal of the study is to find the genes that help cause stuttering and determine regions of the human genetic make-up (genome) that are linked to stuttering.. To do this researchers will study the patterns of inheritance in families who have had members who stutter.
The study has two objectives.
The first objective is to develop a large collection of DNA samples from individuals in stuttering families, that will include both members that stutter and who do not stutter.
The second objective of the study will be to find out the basic combination of genes (genotype) making up all of the participants DNA. Once this is completed researchers hope to map out and find areas or regions of DNA that are linked to stuttering.
Genetic linkage is the initial step in positional cloning, and the cloning of genes which predispose individuals to stuttering is a long term goal of this research study.\<TAB\>
- Detailed Description
A primary goal of this study is to ascertain regions of the human genome which show genetic linkage to stuttering. Genetic linkage will be determined by first obtaining genomic DNA from both affected and unaffected adults and children from families containing pairs of individuals who stutter as adults. Individuals who stutter from genetically isolated populations will also be sampled. Phenotype will be assigned by a speech-language pathologist, and DNA samples will be obtained from affected and unaffected family members from 2 cc. of saliva or from 20 cc. of blood. These DNA samples will then be genotyped using markers distributed across the human genome. The genotypic information analyzed to determine which markers or variants show linkage to stuttering. The initial goal of this study is to identify specific genetic variants, which predispose individuals to stuttering. No genetic information will be provided back to participants. A secondary goal of the study will be to perform broad clinical evaluations of the individuals found to have mutations that cause stuttering. These will take place at the NIH Clinical Center and will include standard procedures including history and physical, neurological exam, audiological exam, ophthalmologic exam, electromyographic (EMG) exam, electroencephalography (EEG), X-rays, speech evaluation, and brain imaging including MRI and fMRI.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 3044
Not provided
Not provided
Study & Design
- Study Type
- OBSERVATIONAL
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method To identify genetic mutations or variants that predispose humans to stuttering. ongoing Our primary outcome measures are the observation or exclusion of genetic linkage to stuttering at a discreet locus or genetic association with stuttering with a specific genetic variant.
- Secondary Outcome Measures
Name Time Method Perform clinical and physical evaluations on those individuals who stutter and possess these genetic variants ongoing disorders in study subjects carrying genetic variants shown to be associated with stuttering in the primary outcome measures.
Trial Locations
- Locations (3)
National Institutes of Health Clinical Center
🇺🇸Bethesda, Maryland, United States
NCEMB - University of Punjab
🇵🇰Lahore, Pakistan
National Rehabilitation Center for Persons with Disabilities Hospital
🇯🇵Saitama, Japan