Genetic Determinants of Sudden Cardiac Death
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|ClinicalTrials.gov Identifier: NCT00064558|
Recruitment Status : Completed
First Posted : July 10, 2003
Last Update Posted : May 17, 2018
|Condition or disease|
|Cardiovascular Diseases Heart Diseases Death, Sudden, Cardiac Ventricular Arrhythmia Arrhythmia|
BACKGROUND Sudden cardiac death (SCD) affects 400,000 individuals each year in the U.S. alone. Over half have no evidence of heart disease prior to death, and our ability to identify those at risk and, therefore prevent SCD, is poor. Mutations in cardiac ion channel genes including SCN5A, KCNQ1, KCNH2, KCNE1, KCNE2 and RyR2 have been implicated in monogenic traits with high risk of SCD, such as the long-QT, Brugada, sudden infant death syndrome (SIDS), and catecholaminergic polymorphic ventricular tachycardia. Alterations in ion channel function can result in life-threatening ventricular arrhythmias in diverse disease states. Therefore, sequence variants in these genes that alter function or transcription of these ion channels may confer a predisposition to ventricular arrhythmia and SCD in broader populations.
DESIGN NARRATIVE This research program proposes to determine if sequence variants in the above and other candidate genes are associated with an increased risk of SCD in apparently-healthy populations. Cases of SCD will be assembled from 5 NIH-funded prospective cohorts with a total of 106,314 individuals with existent blood samples. All cohorts are exceptionally well-characterized with respect to environmental exposures and have collected medical records on cardiovascular endpoints. We will characterize all coding sequence variation and selected non-coding sequence variation among 100 cases and controls from these cohorts for the 6 genes. We will then employ a nested case-control design and conditional logistic regression to test for associations between haplotypes (haplotype tag SNPs) in both coding and non-coding regions of candidate genes and SCD risk. We will also test directly for associations between single loci that may have functional significance and SCD risk. An estimated 600 cases of well-documented SCD will be confirmed over the first 3 years of the grant period, and these cases will be matched on age, sex, ethnicity, and geographic location to two control subjects from the same cohort. In addition, based upon known sex difference in the phenotypic expression of the candidate genes in the primary arrhythmic disorders, we will specifically examine sex difference in the risk of SCD associated with sequence variation in these genes. The findings generated will have substantial implications for our understanding of the SCD syndrome and risk stratification in the general population.
|Study Type :||Observational|
|Actual Enrollment :||2500 participants|
|Official Title:||Genetic Determinants of Sudden Cardiac Death|
|Study Start Date :||July 2003|
|Actual Primary Completion Date :||June 2008|
|Actual Study Completion Date :||June 2008|
- sequence variation [ Time Frame: Ongoing ]To determine if sequence variants in SCN5A, KVLQT1, HERG, KCNE1, KCNE2, and RyR2 genes and other candidate genes are associated with an increased risk of SCD in broader populations.
- Single loci and SCD risk [ Time Frame: Ongoing ]To test directly for associations between single loci that may have functional significance and SCD risk.
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 ClinicalTrials.gov identifier (NCT number): NCT00064558
|Principal Investigator:||Christine M Albert, M.D., M.P.H.||Brigham and Women's Hospital|