Chromosome 5Q Gene Variants and Asthma-Related Traits

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. Read our disclaimer for details. Identifier: NCT00006511
Recruitment Status : Completed
First Posted : November 21, 2000
Last Update Posted : February 18, 2016
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To identify gene variants in human chromosome 5Q31-33 that may be involved in the pathogenesis of asthma.

Condition or disease
Asthma Lung Diseases

Detailed Description:


Markers and genes in chromosomal region 5q31-33 have been shown to be linked or associated to asthma or components of the asthma phenotype, suggesting that this chromosomal region is important in the genetic susceptibility to asthma, yet it has been difficult to show that a specific gene in this region plays a major role in asthma development or progression. Some of this difficulty arises from the fact that many genes are likely to be involved in the pathogenesis of asthma, with no single gene having an effect that will emerge as a major contributor, as well as the fact that the strong influence of environmental factors will complicate the analyses. Having recognized these issues, the investigators will use components of the asthma-associated phenotype, including eosinophilia and a compound "atopy" phenotype, to identify relevant asthma-related genes in this region. The identification of the genes and their genetic variants that may be associated with asthma and its related phenotypes may provide important new information on the pathogenesis of asthma.

The study is in response to a Request for Applications on "Positional Candidate Approaches in Asthma Gene Discovery" released in October 1999.


Dr. Martinez and his group have found linkage between markers in chromosome 5q31 and both eosinophilia and a composite 'atopy' phenotype. The goal of the study is to identify the gene variants in 5q31-33 that are responsible for these two linkage signals. This will be done using the same population of families enrolled in the Tucson Children's Respiratory Study that have now been followed since the time of birth of the index child approximately 18 years ago. In the first specific aim, gene variants having a frequency of 2% or more in a group of 25 known genes in chromosome 5q will be identified. The 25 genes have been selected among those that have been mapped to the 28 cM interval that was tested for linkage in previous studies. The second specific aim is to perform linkage disequilibrium mapping using 100 known polymorphisms in the region of approximately 6.4 cM that shows the highest likelihood of containing the gene variants responsible for either or both of the eosinophilia and atopy linkage signals. Detailed local mapping using both published and newly discovered polymorphisms in and around the areas of positive signals will also be performed. Based on the previous experience of these investigators for the same chromosomal region, several association/linkage signals in chromosome 5q are expected to be found.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

Study Type : Observational
Study Start Date : September 2000
Actual Study Completion Date : August 2005

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Asthma

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 100 Years   (Child, Adult, Older Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No
No eligibility criteria

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 identifier (NCT number): NCT00006511

Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
OverallOfficial: Fernando Martinez University of Arizona

Publications: Identifier: NCT00006511     History of Changes
Other Study ID Numbers: 947
R01HL066447 ( U.S. NIH Grant/Contract )
First Posted: November 21, 2000    Key Record Dates
Last Update Posted: February 18, 2016
Last Verified: January 2006

Additional relevant MeSH terms:
Lung Diseases
Bronchial Diseases
Respiratory Tract Diseases
Lung Diseases, Obstructive
Respiratory Hypersensitivity
Hypersensitivity, Immediate
Immune System Diseases