Epidemiological and Genetic Studies of Body Mass Index

This study has been completed.
Sponsor:
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)
ClinicalTrials.gov Identifier:
NCT00035698
First received: May 4, 2002
Last updated: January 30, 2009
Last verified: January 2009

May 4, 2002
January 30, 2009
December 2001
January 2009   (final data collection date for primary outcome measure)
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Complete list of historical versions of study NCT00035698 on ClinicalTrials.gov Archive Site
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Epidemiological and Genetic Studies of Body Mass Index
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To identify genes involved in obesity.

BACKGROUND:

Increased levels of body mass index (BMI) are associated with increased mortality and morbidity from cardiovascular disease, hypertension, diabetes and other disorders. The frequency of obesity and its associated health-related problems is increasing in the American population.

DESIGN NARRATIVE:

The study builds upon a two-stage genome scan for BMI performed in the NHLBI Family Heart Study (FHS). In the first, 101 pedigrees were examined with 1027 persons genotyped and a LOD of 2.2 was found on chromosome 7. In stage 2, 135 sibships of 380 persons were examined , and a LOD of 3.2 was found for the same locus. Compelling linkage was found in the combined study (LOD = 4.9, chr 7q31.3, 137cM). The LOD or logarithm of odds is a statistical estimate of whether two loci (the sites of genes) are likely to lie near each other on a chromosome and are therefore likely to be inherited together as a package.

A novel strategy will be used which combines three cutting edge methods: (1) Regression Tree analyses to identify a homogenous subset of families with evidence for BMI linkage to 7q31.3; (2) DNA pooling of samples from linked versus unlinked families; and (3) quantitative PCR of DNA pools for very high-density single nucleotide polymorphism (SNP) mapping. The combination of these methods will permit a cost effective approach for the identification of genetic polymorphisms in linkage disequilibrium with BMI, and has the potential to become a widely adopted method for gene localization of complex traits.

The study was extended through January, 2008 to show compelling evidence for a haplotype in the 5' region of the Leptin gene (p<0.00005) influencing BMI among men in the sample. The study will further demonstrate that the responsible gene in this region is not Leptin. SNP and haplotype association studies implicate three strong candidate loci and other loci also warrant additional study. The study will confirm SNP association in an independent study of 200 families showing linkage to the same position (from Dr. R. Arlen Price's group). Those loci with confirmed association will be further characterized by sequencing, genotyping new polymorphisms, and gene expression studies to identify the responsible genes.

Observational
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  • Cardiovascular Diseases
  • Obesity
  • Heart Diseases
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*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Completed
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January 2009
January 2009   (final data collection date for primary outcome measure)

No eligibility criteria

Both
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Contact information is only displayed when the study is recruiting subjects
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NCT00035698
999
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National Heart, Lung, and Blood Institute (NHLBI)
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Investigator: Richard Myers Boston University
National Heart, Lung, and Blood Institute (NHLBI)
January 2009

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP