|First Submitted Date||November 3, 1999|
|First Posted Date||November 4, 1999|
|Last Update Posted Date||March 4, 2008|
|Start Date||October 1996|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures||Not Provided|
|Original Primary Outcome Measures||Not Provided|
|Change History||Complete list of historical versions of study NCT00001602 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures||Not Provided|
|Original Secondary Outcome Measures||Not Provided|
|Current Other Outcome Measures||Not Provided|
|Original Other Outcome Measures||Not Provided|
|Brief Title||Genetic Factors Related to Stuttering|
|Official Title||Genetic Linkage Analysis in Developmental Stuttering: Gene Mapping in Extended Kindreds and Candidate Gene Analyses|
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). This study is designed to increase understanding of the genetic factors that may relate to stuttering.
Deoxyribonucleic acid (DNA) is a protein found in the nucleus of all cells. It is responsible for carrying the genetic information of the organism. DNA provides the directions for making all of the substances in the human body. DNA can be linked together in small segments called genes. Genes can contain information about anything related to an organism.
In order for researchers to determine what genes are directly related to stuttering they must conduct several types of studies.
Linkage studies, are studies of families that have a lot of members who stutter from several generations. The linkage studies will be completed using adult individuals who are diagnosed as persons who stutter and persons who have never stuttered, from one or more families with large numbers of family members who have stuttered over several generations.
Candidate gene studies, look closely at genes suspected to be related to stuttering in patients who may or may not have a significant family history of stuttering.
By conducting these studies, researchers hope to learn more about genes related to stuttering and ultimately find out what causes stuttering.
|Detailed Description||Genetic studies in developmental stuttering are important for their potential in ultimately determining pathophysiological basis of this disorder. This study will combine two approaches to examine genetic aspects of stuttering, linkage in families, and candidate gene analysis. Linkage studies will be completed using adult individuals who are diagnosed as persons who stutter and those who can be judged as never having stuttered from one or more families with large numbers of affected individuals within several generations. Candidate gene analyses will also be carried out in adults who stutter to determine if the frequency of polymorphisms for certain neurotransmitter receptors and enzymes differ from control populations. In addition, given the heterogeneity of the population of adults who stutter, other phenotypic probes such as motor skills, language skills, neuropsychological abilities and psychological responses to stuttering will also be assessed in order to identify subgroups in which the phenotype expression of the gene may differ.|
|Study Design||Not Provided|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Study Groups/Cohorts||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Estimated Completion Date||February 2005|
|Primary Completion Date||Not Provided|
Subjects must be over the age of 5 and under the age of 90.
Subjects must be in general good health, without evidence of chronic medical illness.
Onset of stuttering in affected individuals must have occurred in childhood (between 3 and 10 years of age), unrelated to psychological or neurological trauma.
Subjects will not be tested for the presence of HIV antibodies. Persons with positive HIV antibodies will not be excluded, unless they are taking medication which may change their performance on tasks used for phenotypic assignment.
Subjects will be screened for history of psychiatric illness, such as depression, anxiety or obsessive-compulsive disorders according to DSM-IV criteria. A history of these disorders will not disqualify any subject from participation, but will be noted as a variable in phenotypic assignment.
|Ages||Child, Adult, Senior|
|Accepts Healthy Volunteers||No|
|Contacts||Contact information is only displayed when the study is recruiting subjects|
|Listed Location Countries||United States|
|Removed Location Countries|
|Other Study ID Numbers||970002
|Has Data Monitoring Committee||Not Provided|
|U.S. FDA-regulated Product||Not Provided|
|IPD Sharing Statement||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor||National Institute on Deafness and Other Communication Disorders (NIDCD)|
|PRS Account||National Institutes of Health Clinical Center (CC)|
|Verification Date||February 2005|