Genetic Epidemiology of Asthma in Costa Rica
To identify genetic factors that influence the development of asthma in Hispanics.
|Study Design:||Observational Model: Family-Based
Time Perspective: Cross-Sectional
|Official Title:||Genetic Epidemiology of Asthma in Costa Rica|
- Asthma diagnosis and asthma morbidity [ Time Frame: Baseline/entry to study ] [ Designated as safety issue: No ]
- Lung function measures [ Time Frame: 11 years ] [ Designated as safety issue: No ]Includes lung function measures via spirometry, pre-/post-bronchodilator (BD) results, methacholine challenge results, specific IgE measurements, exposure measurements (e.g., house dust samples/allergens, endotoxin levels in house dust, questionnaire-based exposures to smoking, pets, siblings, etc.)
Biospecimen Retention: Samples With DNA
Blood (and its components, e.g., serum, WBC, etc.)
|Study Start Date:||July 2001|
|Study Completion Date:||July 2011|
|Primary Completion Date:||July 2011 (Final data collection date for primary outcome measure)|
Homogen Hispanic pop/Cent Valley CRA
Homogeneous Hispanic population from the Central Valley of Costa Rica
Asthma is a major public health problem in the United States, with particularly high prevalence rates among some Hispanic groups. Genetic linkage studies of this disease are of potentially great utility for the identification of those at risk, the search for new pharmaceutical treatments, and designing interventions to prevent development of asthma. Study power is greatly enhanced if a relatively isolated, homogeneous population with a significant prevalence of asthma can be identified. Such a population does not exist among Hispanics in the United States but is available in the Central Valley of Costa Rica.
The study concentrates on a genetically isolated Hispanic population with high asthma prevalence living in the Central Valley of Costa Rica. A genome screen will be conducted on large pedigrees multiplex for asthma and linkage analysis performed for seven intermediate phenotypes related to asthma including airway responsiveness; FEV1; bronchodilator responsiveness; skin test reactivity to common aeroallergens; serum total and allergen-specific IgE; and peripheral blood eosinophil count. A genome screen will also be conducted in the parent-child trios, and ancestral haplotypes will be reconstructed to identify regions influencing asthma-associated phenotypes. Within candidate regions demonstrating both linkage in extended pedigrees to asthma and/or asthma-related phenotypes and significant linkage disequilibrium within the unrelated asthmatic subjects, fine mapping will be performed by testing for genetic association to single nucleotide polymorphisms within positional candidate genes.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00021840
|Hospital Nacional de Ninos|
|San Jose, Costa Rica|
|Principal Investigator:||Scott T. Weiss, MD, MS||Brigham and Women's Hospital|