Pima subjects homozygous for the Trp64Arg beta 3-adrenergic-receptor mutation have an earlier onset of NIDDM and tend to have a lower resting metabolic rate.
The Trp64Arg allele of the beta 3-adrenergic receptor is associated with abdominal obesity and resistance to insulin and may contribute to the early onset of NIDDM:
Recently, a missense mutation replacing tryptophan with arginine at codon 64 of the beta 3-adrenergic receptor gene was shown to be associated with insulin resistance in nondiabetic subjects and to an earlier onset of NIDDM in Pima Indians.
These data suggest that the Trp64Arg mutation not only contributes to weight gain and age-at-onset of NIDDM but is also associated with susceptibility to NIDDM.
In conclusion, the TRP64ARG beta 3AR mutation or any other mutation in the beta 3AR gene is not a major contributor to genetic susceptibility to NIDDM and obesity likely in Nauruans.
The Trp64Arg polymorphism of the beta 3-adrenergic receptor gene is unlikely to be a major genetic predisposer to NIDDM or insulin resistance syndrome in subjects from eastern Finland.
The Trp64Arg allele of the beta 3-AR gene was significantly more frequent in the NIDDM patients with PDR (P = 0.002), but not in those with non-PDR (P = 0.151), than in NIDDM patients without diabetic retinopathy.
Non-diabetic subjects heterozygous for the mutation were more obese and Trp/Arg diabetics had a slightly younger age of onset of NIDDM (47 vs 51 years, respectively), but there were no significant differences in mutation frequency between the two groups.Metabolic parameters (e.g. fasting lipids and glycaemic control) were similar among diabetic subjects with and without the Trp64Arg mutation.3.
The Trp64Arg polymorphism of the beta 3-adrenergic receptor gene is not associated with obesity or type 2 diabetes mellitus in a large population-based Caucasian cohort.
Heterozygosity for the Trp64Arg polymorphism of the beta 3-adrenergic receptor gene is not accompanied by obesity, impaired glucose tolerance and type 2 diabetes mellitus in the general elderly Dutch population, and is also not associated with changes in circulating leptin levels.
The Trp64Arg beta3AR variant is associated in some, but not all, studies with an earlier onset of Type 2 diabetes mellitus and features of the insulin resistance syndrome.
Our results suggest that the Trp64Arg mutation is not a major determinant of metabolic disorders (type 2 diabetes, obesity) and chronic complications of type 2 diabetes in a Dutch population.
Common variants in the beta2-(Gln27Glu) and beta3-(Trp64Arg)--adrenoceptor genes are associated with elevated serum NEFA concentrations and type II diabetes.
Genotype Arg/Arg, but not Trp/Arg, of the Trp64Arg polymorphism of the beta(3)-adrenergic receptor is associated with type 2 diabetes and obesity in a large Japanese sample.
In conclusion, no major difference was associated with the beta3AR Trp64Arg or FABP2 Ala54Thr polymorphism in terms of type 2 diabetes or hyperlipidemia in young to older Japanese men.
The beta(3)-adrenergic receptor gene (BAR-3) allelic variant (Trp64Arg and Arg64Arg) is correlated with obesity or non-insulin-dependent diabetes mellitus.
To determine whether this SNP affects insulin resistance syndrome associated with type 2 diabetes, we examined its effects on susceptibility to obesity, hyperlipidemia and hypertension in type 2 diabetic subjects and on susceptibility to type 2 diabetes by interaction with other frequent genes involved in lipid metabolism, namely, beta3-adrenergic receptor (b3AR) Trp64Arg, phosphodiesterase 3B (PDE3B) c.1389G>A or lysosomal acid lipase (LAL) Thr-6Pro.
The Trp64Arg polymorphism in the beta3AR gene has been reported to be associated with insulin resistance, obesity and type 2 diabetes; little is known about its possible association with cancer.
We studied possible relations between GDM and both insulin receptor substrate 1 (IRS-1) (Gly972Arg) and beta3-adrenergic receptor (ADRB3 Trp64Arg, beta3-AR) gene mutations, considered potential modifying factors in the etiology of type 2 diabetes mellitus.
Some studies indicate that the Trp64Arg polymorphism in the gene encoding the beta3-adrenergic receptor (ADRB3) is associated with obesity, insulin resistance and earlier onset of type 2 diabetes mellitus.