We examined the genetic associations of the G-2548A polymorphism in the promoter of the leptin (LEP) gene and the Gln223Arg (Q223R) polymorphism of the leptin receptor (LEPR) gene with obesity.
To conclude, our results support the hypothesis that Gln223Arg</span> polymorphism of LEPR in Mexican adolescents is associated with haemodynamic and metabolic disturbances related to obesity.
Some polymorphic genes involved in the regulation of leptin-the leptin gene (LEP A19G), the leptin receptor gene (LEPR Q223R, K109R, and K656N), and the peroxisome proliferator-activated receptor-gamma gene (PPARG P12A and C161T)--have been investigated as possible factors associated with obesity.
Obesity-related genetic factors including common polymorphisms in the leptin gene (LEP A19G and G-2548A) and its receptor (LEPR Q223R) were investigated in DNA available for 376 patients and 805 controls.
Because radiation at a young age may affect the hypothalamus causing leptin receptor insensitivity, we hypothesized that a polymorphism in the leptin receptor (LEPR) gene, Gln223Arg, might influence susceptibility to obesity in survivors of childhood ALL.
These findings support the hypothesis that the Q223R polymorphism (but not the K109R or K656N polymorphism) of the leptin receptor gene is associated with obesity and predicts a small percentage of body weight and body composition variability in a genetically homogeneous population.