title: Association of beta2-adrenoceptor Gln27Glu variant with body weight but not hypertension.
abstract: Beta2-adrenoceptor (beta2-ADR)-mediated vasodilatation decreases vascular reactivity and blood pressure (BP) and chromosome 5 where its gene (ADRB2R) resides and shows linkage to hypertension (HT). A Gln27Glu ADRB2R variant confers resistance to agonist-induced desensitization and enhanced vasodilator response to isoprenaline. Therefore, we carried out a case-control study in a cohort of HT and normotensive (NT) Anglo-Celtic Australian white subjects whose parents had a similar BP status as the subjects. Glu27 frequency was 0.41 in 108 HT and 0.42 in 141 NT (chi2 = 0.05, P = .82). Within the HT group, the Glu27 allele was more prevalent in 61 subjects who were overweight (body mass index [BMI] > or = 25 kg/m2) compared with 41 who were lean (BMI <25 kg/m2); ie, 0.49 v 0.31, respectively (chi2 = 6.4, P = .012). Furthermore, Glu27 tracked with elevation in BMI in these subjects: 24 +/- 4 kg/m2, 27 +/- 5 kg/m2, and 28 +/- 5 kg/m2 for Gln/Gln, Gln/Glu, and Glu/Glu, respectively (P = .0058 by one-way ANOVA). Thus, the Gln27Glu beta2-ADR variant is excluded in HT, but might influence body weight.
authors.affiliation: Department of Physiology and Institute for Biomedical Research, The University of Sydney, New South Wales, Australia.
authors.lastname: Lin RCY
authors.forename: J O
authors.initials: JO
authors.lastname: Ericsson
authors.forename: A V
authors.initials: AV
authors.lastname: Benjafield
authors.forename: B J
authors.initials: BJ
authors.lastname: Morris
mesh_terms: D001835:Body Weight / Q000235:genetics; D016022:Case-Control Studies; D002895:Chromosomes, Human, Pair 5; D015331:Cohort Studies; D005819:Genetic Markers; D020022:Genetic Predisposition to Disease; D005838:Genotype; D018698:Glutamic Acid / Q000235:genetics; D005973:Glutamine / Q000235:genetics; D006801:Humans; D006973:Hypertension / Q000453:epidemiology / Q000235:genetics*; D009765:Obesity / Q000453:epidemiology / Q000235:genetics*; D018343:Receptors, Adrenergic, beta-2 / Q000235:genetics*; D012307:Risk Factors
chemical_list: D005819:Genetic Markers; D018343:Receptors, Adrenergic, beta-2; D005973:Glutamine; D018698:Glutamic Acid