Genetic Linkage Studies of Stuttering
|First Received Date ICMJE||November 3, 1999|
|Last Updated Date||December 22, 2012|
|Start Date ICMJE||January 1997|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE||Not Provided|
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT00001604 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE||Not Provided|
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Genetic Linkage Studies of Stuttering|
|Official Title ICMJE||Genetic Studies of Stuttering|
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.
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 by buccal swab or from 20 cc. of blood. 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 stuttering. The secondary goal of this study is to identify specific genetic variants which predispose individuals to stuttering. No genetic information will be provided back to participants.
|Study Type ICMJE||Observational|
|Study Design ICMJE||Not Provided|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Intervention ICMJE||Not Provided|
|Study Group/Cohort (s)||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Recruiting|
|Estimated Enrollment ICMJE||4000|
|Completion Date||Not Provided|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
|Ages||6 Years and older|
|Accepts Healthy Volunteers||No|
|Location Countries ICMJE||United States|
|NCT Number ICMJE||NCT00001604|
|Other Study ID Numbers ICMJE||970057, 97-DC-0057|
|Has Data Monitoring Committee||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor ICMJE||National Institute on Deafness and Other Communication Disorders (NIDCD)|
|Collaborators ICMJE||Not Provided|
|Information Provided By||National Institutes of Health Clinical Center (CC)|
|Verification Date||September 2012|
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