Variants in the LEPR gene are nominally associated with higher BMI and lower 24-h energy expenditure in Pima Indians

Obesity (Silver Spring). 2012 Dec;20(12):2426-30. doi: 10.1038/oby.2012.159. Epub 2012 Jun 22.

Abstract

Genome-wide association studies (GWASs) have been used to search for susceptibility genes for type 2 diabetes and obesity in the Pima Indians, a population with a high prevalence of both diseases. In these studies, a variant (rs2025804) in the LEPR gene was nominally associated with BMI in 1,082 subjects (P = 0.03 adjusted for age, sex, birth year, and family membership). Therefore the LEPR and leptin overlapping transcript (LEPROT) genes were selected for further sequencing and genotyping in larger population-based samples for association analyses with obesity-related phenotypes. Selected variants (n = 80) spanning these genes were genotyped in a sample of full-heritage Pima Indians (n = 2,842) and several common variants including rs2025804 were nominally associated with BMI (P = 0.05-0.003 adjusted for age, sex, birth year, and family membership). Four common tag variants associated with BMI in the full-heritage Pima Indian sample were genotyped in a second sample of mixed-heritage Native Americans (n = 2,969) and three of the variants showed nominal replication (P = 0.03-0.006 adjusted as above and additionally for Indian heritage). Combining both samples provided the strongest evidence for association (adjusted P = 0.0003-0.0001). A subset of these individuals (n = 403) had been metabolically characterized for predictors of obesity and the BMI risk alleles for the variants tagged by rs2025804 were also associated with lower 24-h energy expenditure (24hEE) as assessed in a human respiratory chamber (P = 0.0007 adjusted for age, sex, fat mass, fat-free mass, activity, and family membership). We conclude that common noncoding variation in the LEPR gene is associated with higher BMI and lower energy expenditure in Native Americans.

Publication types

  • Research Support, N.I.H., Intramural

MeSH terms

  • Body Mass Index*
  • Diabetes Mellitus, Type 2 / epidemiology
  • Diabetes Mellitus, Type 2 / genetics*
  • Diabetes Mellitus, Type 2 / metabolism
  • Energy Metabolism / genetics*
  • Female
  • Genetic Predisposition to Disease
  • Genome-Wide Association Study
  • Genotype
  • Humans
  • Indians, North American / genetics*
  • Male
  • Obesity / epidemiology
  • Obesity / genetics*
  • Obesity / metabolism
  • Phenotype
  • Polymorphism, Single Nucleotide
  • Postprandial Period
  • Receptors, Leptin / genetics*
  • Receptors, Leptin / metabolism
  • Thermogenesis

Substances

  • Receptors, Leptin
  • leptin receptor, human