Beta2-Adrenergic Receptor Gene Polymorphisms in Egyptian Patients with Acute Myocardial Infarction

Background . Beta 2 -adrenergic receptor ( ADRB2 ) gene polymorphisms, Arg16Gly and Gln27Glu, have been implicated in the pathogenesis of cardiovascular diseases. The aim of this study was to determine the association of these two polymorphisms with the risk of myocardial infarction (MI) in the Egyptian population. Methods . Blood samples were collected from 68 MI patients and 75 healthy controls. They were assessed for the presence of cardiovascular risk factors and genotyped for the Arg16Gly ( rs1042713 ) and Gln27Glu ( rs1042714 ) polymorphisms using allelic-discrimination polymerase chain reaction. Results . There is no significant difference in genotype and allele frequencies at codon 16 between MI patients and controls (P=0.919). However, at codon 27, MI risk was higher in Gln 27 homozygous participants than in Glu 27 carriers (P=0.045). The haplotype frequency distribution showed significant difference among cases and controls (P=0.002); homozygotes for Gly 16 /Gln 27 haplotype were more susceptible to MI than Gly 16 /Glu 27 carriers. Patients with Arg 16 /Gln 27 haplotype had higher serum total cholesterol levels (P<0.05) and lower frequency of diabetes in MI patients (P<0.01). However, both Glu 27 genotypes and haplotype showed lower frequency of hypertension (P<0.001). Conclusions . Our findings suggested that the ADRB2 gene polymorphisms may play an important role in susceptibility of MI among Egyptian population.