Abstract
BACKGROUND: Uncoupling proteins (UCP) and β3-adrenergic receptor (ADRB3) gene polymorphism have been implicated in the susceptibility to type 2 diabetes mellitus (T2DM) but the results are inconsistent and inconclusive.
 AIM: The aim was to investigate the relationship between -3826A/G (rs1800592) of UCP 1 and ADRB3 Trp64Arg (C/T) (rs4994) gene polymorphism and the incidence of T2DM among Saudis.
 METHODS: Genotyping of both UCP1 and ADRB3 genes was carried out in 110 healthy controls and 108 unrelated Saudis with T2DM using polymerase chain reaction-based restriction fragment length polymorphism.
 RESULTS: The genotype and allele frequencies of the UCP1 gene did not differ significantly between diabetic subjects and controls (p > 0.05). However, the CT genotype and the T allele of ADRB3 were higher in diabetic subjects compared with the controls while the CC genotype and C allele were higher in the controls relative to the diabetic subjects (Odds ratios [OR]: 7.85, 95% confidence interval [CI]: 4.23–14.59, p < 0.001 and OR: 7.434 95% CI: 4.026–13.39, p < 0.001, respectively).
 CONCLUSION: The UCP1 -3826A/G polymorphism may not be associated with the susceptibility to T2DM among Saudis while T allele of ADRB3 may be related to the risk of T2DM, whereas the CC genotype and C allele may confer protection to T2DM.
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