Gln27Glu variant of the beta(2)-adrenergic receptor gene is not associatedwith obesity and diabetes in Japanese-Americans

The beta (3)-adrenergic receptor (AR) gene variant (Trp64Arg) has been repo rted to be associated with obesity and insulin resistance in humans. Howeve r, this association remains controversial. We investigated the relationship s between the beta (2)-AR gene variant (Gln27Glu) and obesity, insulin resi stance, and serum lipids in Japanese-Americans. The frequency of an abnorma l Gln27Glu allele in the beta (2)-AR gene in 652 subjects was 0.092 in male s, 0.077 in females, and 0.084 overall, markedly lower than the previously reported value of 0.4 in Caucasian men and women. In both males and females , there were no differences in the indices of obesity, insulin resistance, and serum lipid levels between the subjects with and without the beta (2)-A R gene (Gln27Glu) variant in patients with normal glucose tolerance (NGT), impaired glucose tolerance (IGT), or diabetes (DM). The frequency of the be ta (2)-AR gene (Gln27Glu) variant tended to increase with worsening of gluc ose tolerance, but the differences were not statistically significant. Furt hermore, there were no differences in the frequency of the beta (2)-AR gene variant in either males or females with obesity (body mass index [BMI], gr eater than or equal to 25.2). Even in Japanese-Americans, who have a more w esternized life style than Japanese, the association of the beta (2)-AR gen e (Gln27Glu) variant with the parameters of obesity, insulin resistance, an d serum lipid level has yet to be clarified. We conclude that the beta (2)- AR gene (Gln27Glu) variant might not be an important factor for obesity or IGT in Japanese subjects. Copyright (C) 2001 by W.B. Saunders Company.