Trp64Arg substitution in the beta(3)-adrenergic receptor does not relate to body weight in healthy, premenopausal women

OBJECTIVE: To examine the contribution of the substitution of arginine for tryptophan at amino acid position 64 (Trp64Arg) of the beta(3)-adrenergic receptor to body weight and weight-related factors in healthy, premenopausal women. SUBJECTS: Five hundred and five healthy, premenopausal women 44-50 y, body mass index (BMI) 20-34 kg/m(2). MEASUREMENTS: Subjects were genotyped for the Trp64Arg substitution using restriction fragment length poly-morphism (RFLP) analysis. Measurements for weight and weight-related factors (for example, weight, waist-hip ratio, lipid levels) were also taken. RESULTS: Two women were homozygous Arg/Arg, 75 women were heterozygous Trp/Arg, and 428 women were homozygous Trp/Trp. The frequency of the Arg substitution was 0.078. When subjects with and without the arginine substitution were compared, no significant differences were found on measures of weight or weight-related risk factors. CONCLUSION: The results confirm previous studies suggesting that the Trp64Arg substitution of the beta(3)-adrenergic receptor is not related to weight or weight-related phenotypes in healthy, premenopausal women.