Diet Intervention and GEnetic STudy (DIGEST-Pilot) (DIGEST)
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ClinicalTrials.gov Identifier: NCT01658137 |
Recruitment Status : Unknown
Verified June 2016 by Sonia Anand, McMaster University.
Recruitment status was: Active, not recruiting
First Posted : August 6, 2012
Last Update Posted : June 7, 2016
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Tracking Information | |||||
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First Submitted Date ICMJE | July 28, 2012 | ||||
First Posted Date ICMJE | August 6, 2012 | ||||
Last Update Posted Date | June 7, 2016 | ||||
Study Start Date ICMJE | July 2012 | ||||
Estimated Primary Completion Date | December 2016 (Final data collection date for primary outcome measure) | ||||
Current Primary Outcome Measures ICMJE |
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Original Primary Outcome Measures ICMJE | Same as current | ||||
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Current Secondary Outcome Measures ICMJE |
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Original Secondary Outcome Measures ICMJE | Same as current | ||||
Current Other Pre-specified Outcome Measures | Not Provided | ||||
Original Other Pre-specified Outcome Measures | Not Provided | ||||
Descriptive Information | |||||
Brief Title ICMJE | Diet Intervention and GEnetic STudy (DIGEST-Pilot) | ||||
Official Title ICMJE | Dietary Intervention Trial to Understand the Mechanism Underlying the 9p21 Variant Interaction With High Fruits and Vegetable Consumption | ||||
Brief Summary | Genetic factors contribute to risk factors for cardiovascular disease, such as blood lipids, blood pressure, obesity, diabetes, and may also influence dietary choices, physical activity, and responses to stress. The most robust genetic variant associated with myocardial infarction (MI) is the 9p21 variant, which may raise the risk of MI by up to 40% in those who carry 2 copies of the gene. The investigators recently found that among those who carry the 9p21 variant, the risk of MI may be "turned off" if individuals eat a diet high in fruits and vegetables. The investigators seek to determine how a "prudent" or "anti-inflammatory" diet interacts with the 9p21 risk allele to alter the risk of MI. | ||||
Detailed Description | Cardiovascular disease (CVD) is the leading cause of death globally. The majority of CVD is explained by conventional risk factors including cigarette smoking, abnormal lipids, high blood pressure, obesity, diabetes, and health behaviours including dietary intake, physical activity, and psychosocial stressors. Genetic factors contribute to the development of these risk factors, and directly to CVD through other novel pathways. Since the advent of high throughput chip-based genotyping, more than 30 genetic variants have been found to be associated with myocardial infarction. The most robust genetic variant which has been consistently associated with myocardial infarction and other forms of arterial disease is the 9p21 variant. This genetic variant located on Chromosome 9 is common in the population, with 50% of people carrying one copy of the risk allele, and an additional 25% of the population carrying two copies of the risk allele. Compared with those with no copies of the risk allele, the risk of myocardial infarction with one copy of the risk allele is 15-20% higher, and the increased risk among carriers of 2 risk alleles is 20-40%. To date the exact mechanism by which the 9p21 variant increases the risk of myocardial infarction is unknown, although some data suggests that other genes and pathways associated with cell proliferation and inflammation are involved. Recently we made the observation that among carriers of the 9p21 variant, the risk of MI may be "turned off" if individuals consumed a diet high in fruits and vegetables. However the "mechanism" underlying this interaction is unknown. We seek to discover how a "Prudent" (i.e. anti-inflammatory) diet interacts with the 9p21 risk allele(s) to alter the risk of myocardial infarction. We postulate that a "Prudent" diet (i.e. a diet high in fruits, vegetables, whole grains, non-processed foods) in comparison to a "Western" or "inflammatory diet" (eg, a typical North American diet high in saturated fats and processed foods) will differentially alter the gene expression (measured by RNA) of the 9p21 locus, change the epigenetic marks in this region, and alter several inflammatory markers suspected to mediate the effect of 9p21 on CVD risk (eg, hs-CRP, IF-alpha21, IFN-γ , interleukin 1-alpha, interleukin 1-beta, and interleukin 6) among people with one or two copies of the risk allele compared to people without the risk allele. The proposed study offers an unique approach to studying dietary relationships with endpoints believed to be influenced by 9p21 gene variants. Rather than testing nutritional supplements, our results will be generalizable to the setting of most dietary counseling practices, which aim to alter dietary patterns, not specific nutrients. This trial will help us to unravel the basis for gene-diet interactions and gain a greater understanding of how inflammation is linked to the development of atherosclerosis, CVD, and possibly some cancers. |
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Study Type ICMJE | Interventional | ||||
Study Phase ICMJE | Not Applicable | ||||
Study Design ICMJE | Allocation: Randomized Intervention Model: Parallel Assignment Masking: None (Open Label) Primary Purpose: Prevention |
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Condition ICMJE |
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Intervention ICMJE |
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Study Arms ICMJE |
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Publications * |
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* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline. |
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Recruitment Information | |||||
Recruitment Status ICMJE | Unknown status | ||||
Actual Enrollment ICMJE |
84 | ||||
Original Estimated Enrollment ICMJE |
80 | ||||
Estimated Study Completion Date ICMJE | December 2016 | ||||
Estimated Primary Completion Date | December 2016 (Final data collection date for primary outcome measure) | ||||
Eligibility Criteria ICMJE | Inclusion Criteria:
Exclusion Criteria:
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Sex/Gender ICMJE |
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Ages ICMJE | 18 Years to 80 Years (Adult, Older Adult) | ||||
Accepts Healthy Volunteers ICMJE | Yes | ||||
Contacts ICMJE | Contact information is only displayed when the study is recruiting subjects | ||||
Listed Location Countries ICMJE | Canada | ||||
Removed Location Countries | |||||
Administrative Information | |||||
NCT Number ICMJE | NCT01658137 | ||||
Other Study ID Numbers ICMJE | DIGEST-Pilot | ||||
Has Data Monitoring Committee | No | ||||
U.S. FDA-regulated Product | Not Provided | ||||
IPD Sharing Statement ICMJE |
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Current Responsible Party | Sonia Anand, McMaster University | ||||
Original Responsible Party | Same as current | ||||
Current Study Sponsor ICMJE | McMaster University | ||||
Original Study Sponsor ICMJE | Same as current | ||||
Collaborators ICMJE | Not Provided | ||||
Investigators ICMJE |
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PRS Account | McMaster University | ||||
Verification Date | June 2016 | ||||
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP |