Epidemiological and Genetic Studies of Body Mass Index

Obesity Clinical Trial

Official title:

Epidemiological and Genetic Studies of Body Mass Index

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00035698
• Other study ID #: H-24244
• Secondary ID: R01HL068891
• Status: Completed
• Phase: N/A
• First received: May 4, 2002
• Last updated: March 16, 2017
• Start date: December 2001
• Est. completion date: January 2009

Study information

• Verified date: March 2017
• Source: Boston University
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

To identify genes involved in obesity.

Description:

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 1027
• Est. completion date: January 2009
• Est. primary completion date: January 2009
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years to 64 Years

Eligibility

The PI was not involved in the study recruitment or examination of the subjects form which the adipose samples were obtained and all data were de-identified.

Related Conditions & MeSH terms

• Cardiovascular Diseases
• Heart Diseases
• Obesity

Locations

Country	Name	City	State
n/a

Sponsors (2)

Lead Sponsor	Collaborator
Boston University	National Heart, Lung, and Blood Institute (NHLBI)

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	This was an observational study, consequently there were no outcomes.	This was an observational study, consequently there were no outcomes.	1997-2009