title: Frequencies of the Arg16Gly, Gln27Glu and Thr164Ile Adrenoceptor β2 Polymorphisms among Omanis.
abstract: OBJECTIVE
  This study aimed to assess the distribution of missense mutations in the adrenoceptor β2 (ADRB2) gene in an Omani cohort.
  
  
  METHODS
  This study was carried out between May 2014 and March 2015 at the Sultan Qaboos University, Muscat, Oman. Blood samples were taken from 316 unrelated Omani subjects. Genotyping for rs1042713 (c.46A>G, p.Arg16Gly), rs1042714 (c.79C>G, p.Gln27Glu) and rs1800888 (c.491C>T, p.Thr164Ile) polymorphisms was performed by real-time polymerase chain reaction using single nucleotide polymorphism (SNP) genotyping assays. The allelic frequencies of these polymorphisms were estimated on the basis of the observed numbers of specific alleles from the genotype data for male and female subjects. The genotype frequencies for each polymorphism were tested for deviation from the Hardy-Weinberg equilibrium.
  
  
  RESULTS
  Gly16 and Glu27 were the most frequent variants found among the cohort (63% and 75%, respectively). The Ile164 variant was not detected in the study population. There was a significant linkage disequilibrium between the rs1042713 and rs1042714 SNPs (r(2) = 0.209; P ≤0.001). The most observed haplotypes were Gly16-Gln27 and Arg16-Gln27 (0.37 and 0.38, respectively). The frequency of Gly16-Glu27 was 0.25, comprising all Glu27 carriers.
  
  
  CONCLUSIONS
  The allelic distribution of variants in this Omani cohort was similar to distributions reported among Caucasian populations.
authors.affiliation: Departments of Pharmacology & Clinical Pharmacy, Sultan Qaboos University, Muscat, Oman;
authors.forename: Khalid
authors.initials: K
authors.lastname: Al-Balushi
authors.affiliation: Biochemistry, College of Medicine & Health Sciences, Sultan Qaboos University, Muscat, Oman;
authors.forename: Fahad
authors.initials: F
authors.lastname: Zadjali
authors.affiliation: Department of Laboratory Medicine & Pathology, Royal Hospital, Muscat, Oman;
authors.forename: Sawsan
authors.initials: S
authors.lastname: Al-Sinani
authors.affiliation: Department of Small Animal Health, Directorate General of Veterinary Services, Royal Court Affairs, Muscat, Oman;
authors.forename: Al-Muatasim
authors.initials: AM
authors.lastname: Al-Zadjali
authors.affiliation: Department of Basic Medical Sciences, Dubai Healthcare City, Dubai, United Arab Emirates.
authors.forename: Riad
authors.initials: R
authors.lastname: Bayoumi
keywords: Allele Frequencies; Genetic Polymorphisms; Genotype; Oman; Single Nucleotide Polymorphisms; beta-2 Adrenergic Receptor