Abstract
OBJECTIVE: To examine the role of the Trp64Arg polymorphism in the β3-adrenergic receptor gene and the β3-adrenergic receptor gene locus in obesity-related traits in African Americans. SUBJECTS: A total of 687 individuals representing 193 African American families who were residents of metropolitan Chicago. MEASUREMENTS: Genotyping of the Trp64Arg polymorphism in the β3-adrenergic receptor gene and three microsatellite markers flanking the β3-adrenergic receptor gene (ADRB3) locus and measuring various obesity-related traits, including body mass index (BMI), fat-free mass, fat mass, percentage fat mass, waist circumference and serum lipid levels. RESULTS: The prevalence of obesity (defined as body mass index ≥30 kg/m2) in the population was 27.3% and 51.2% in men and women, respectively. The frequency of the Arg64 allele was 10.0%. Multivariate regression analyses confirmed the existence of a significant contribution of familial variance to each of the five obesity-related traits noted above. Likelihood ratio statistics computed in a multivariate regression analysis failed to demonstrate a significant association between the Arg64 allele and any of the five obesity-related traits. Single and multipoint analyses using extended Haseman-Elston regression analyses failed to demonstrate suggestive evidence of linkage of three microsatellite markers that flank the β3-adrenergic receptor gene to BMI, percentage body fat, waist circumference or serum leptin levels. CONCLUSION: Given the contribution of familial variance to obesity-related traits in this population, neither the null finding for the Arg64 allele nor the lack of evidence of linkage of the ADRB3 locus to obesity-related traits could be attributed to lack of transmissibility of the traits suggesting that neither the Arg64 variant of the β3-adrenergic receptor gene nor another genetic variant in or near the ADRB3 locus contribute significantly to familial aggregation of obesity-related traits in African Americans.
Original language | English (US) |
---|---|
Pages (from-to) | 54-60 |
Number of pages | 7 |
Journal | International Journal of Obesity |
Volume | 25 |
Issue number | 1 |
DOIs | |
State | Published - 2001 |
Keywords
- African American
- Genetics
- Leptin
- β3-adrenergic receptor
ASJC Scopus subject areas
- Medicine (miscellaneous)
- Endocrinology, Diabetes and Metabolism
- Nutrition and Dietetics