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Epidemiological and Genetic Studies of Body Mass Index

This study has been completed.
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI) Identifier:
First received: May 4, 2002
Last updated: January 30, 2009
Last verified: January 2009
To identify genes involved in obesity.

Cardiovascular Diseases
Heart Diseases

Study Type: Observational

Further study details as provided by National Heart, Lung, and Blood Institute (NHLBI):

Study Start Date: December 2001
Study Completion Date: January 2009
Primary Completion Date: January 2009 (Final data collection date for primary outcome measure)
Detailed Description:


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.


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.


Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
No eligibility criteria
  Contacts and Locations
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Please refer to this study by its identifier: NCT00035698

Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
OverallOfficial: Richard Myers Boston University
  More Information Identifier: NCT00035698     History of Changes
Other Study ID Numbers: 999 
Study First Received: May 4, 2002
Last Updated: January 30, 2009

Additional relevant MeSH terms:
Cardiovascular Diseases
Heart Diseases processed this record on February 27, 2017