title: Association of A1166C polymorphism in AT(1) receptor gene with baroreflex sensitivity.
abstract: The aim of this study was to evaluate the association of A1166C polymorphism in angiotensin II type 1 receptor (AT(1)R) gene with baroreflex sensitivity (BRS in ms/mm Hg; BRSf in mHz/mm Hg) in man. BRS and BRSf were determined by a spectral method in 135 subjects (19-26 years) at a frequency of 0.1 Hz. Genotypes were detected by means of polymerase chain reaction and restriction analysis using enzyme DdeI. We compared BRS and BRSf among genotypes of this polymorphism. The frequency of genotypes of AT(1)R A1166C polymorphism was: 45.9 % (AA, n=62), 45.9 % (AC, n=62), 8.2 % (CC, n=11). Differences in BRS (p<0.05) and BRSf (p<0.01) among genotypes of this single nucleotide polymorphism were found (Kruskal-Wallis: BRS - AA: 7.9+/-3.3, AC: 8.6+/-3.6, CC: 5.9+/-2.3 ms/mm Hg; BRSf - AA: 12.0+/-4.0, AC: 12.0+/-5.0, CC: 8.0+/-3.0 mHz/mm Hg). Compared to carriers of other genotypes (AA+AC) the homozygotes with the less frequent allele (CC) showed significantly lower BRSf (Mann-Whitney: BRSf - AA+AC: 12.0+/-4.0, CC: 8.0+/-3.0 mHz/mm Hg; p<0.01) and borderline lower BRS (BRS - AA+AC: 8.2+/-3.5, CC: 5.9+/-2.5 ms/mm Hg; p=0.07). We found a significant association of A1166C polymorphism in AT(1) receptor gene with baroreflex sensitivity. Homozygosity for the less frequent allele was associated with decreased baroreflex sensitivity.
authors.affiliation: Department of Physiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Jíra
authors.forename: E
authors.initials: E
authors.lastname: Závodná
authors.forename: N
authors.initials: N
authors.lastname: Honzíková
authors.forename: Z
authors.initials: Z
authors.lastname: Nováková
authors.forename: A
authors.initials: A
authors.lastname: Vašků
authors.forename: L
authors.initials: L
authors.lastname: Izakovicová Hollá
authors.forename: B
authors.initials: B
authors.lastname: Fiser
mesh_terms: D000328:Adult; D017704:Baroreflex / Q000235:genetics*; D001794:Blood Pressure / Q000235:genetics*; D001795:Blood Pressure Determination; D018153:Czech Republic; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006339:Heart Rate / Q000235:genetics*; D006720:Homozygote; D006801:Humans; D008297:Male; D016017:Odds Ratio; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide; D044140:Receptor, Angiotensin, Type 1 / Q000235:genetics*; D018570:Risk Assessment; D012307:Risk Factors; D012815:Signal Processing, Computer-Assisted; D055815:Young Adult
chemical_list: C544065:AGTR1 protein, human; D044140:Receptor, Angiotensin, Type 1