[Study on distribution of single nucleotide polymorphism in 5'-regulatory region of beta(2)-adrenoceptor gene in hypertensives].

OBJECTIVE: To detect single nucleotide polymorphisms (SNP) existing in 5'-regulatory region of beta(2)-adrenoceptor (beta(2)-AR) gene and to investigate their associations with hypertension. METHODS: beta(2)-AR gene was sequenced by fluorescent labeling automatic sequencing method in unrelated Chinese Han population distributed in Dabie Mountain in Anhui Province. Genotypes of the SNP were typed by PCR-RFLP method. RESULTS: Two SNP of 1.3 kb long were identified at position 1023 and 654 respectively. They were both G-->A substitution. The frequency of genotype of the two SNP complied well with the Hardy-Weinberg equilibrium. The distribution of the SNP genotype AA, GA and GG at position 1023 in the severe hypertension group was significantly different from that in normal group (chi(2) = 9.53, df = 2, P < 0.01), AA frequency is significantly higher in the severe hypertension group than in the normal group (chi(2) = 9.21, df = 1, P < 0.01). CONCLUSION: The SNP at locus 1023 of human beta(2)-AR gene is associated with severe hypertension in Chinese Han population.