title: Association between renin-angiotensin-aldosterone system genotypes and haplotypes and risk of ischemic stroke of atherosclerotic etiology.
abstract: OBJECTIVE
  The association of renin C-4063T and angiotensinogen (AGT) T174M, AGT M235T and AGT A-6G polymorphisms with ischemic stroke of atherosclerotic etiology was investigated in 329 Tunisian patients with stroke and 444 controls.
  
  
  METHODS
  Genotyping was performed using PCR-RFLP and the contributions of polymorphisms to the risk of stroke were analyzed using haplotype and multivariate regression analysis.
  
  
  RESULTS
  AGT 235T and AGT-6G allele and AGT 235T/T, AGT-6A/G and AGT-6G/G genotype frequencies were higher in patients. Linkage disequilibrium (LD) was noted for AGT174T with AGT235M and AGT(-6)A in patients, while AGT235M was in LD with AGT(-6)A in controls and AGT235T was in LD with AGT(-6)G in both groups. The AGT 174T/235T/-6A and AGT 174T/235M/-6G haplotypes were positively and negatively associated with stroke respectively. Multivariate regression analysis identified AGT 174T/235M/-6A, AGT 174T/235T/-6G, AGT 174T/235T/-6A and AGT 174M/235T/-6A haplotypes to be significantly associated with an increased risk of stroke.
  
  
  CONCLUSIONS
  Renin-angiotensin-aldosterone system polymorphisms influence the risk of atherosclerotic stroke in Tunisians.
authors.affiliation: Research Unit of Hematological and Autoimmune Diseases, Faculty of Pharmacy, University of Monastir, Monastir, Tunisia.
authors.forename: S
authors.initials: S
authors.lastname: Saidi
authors.forename: S G
authors.initials: SG
authors.lastname: Mallat
authors.forename: W Y
authors.initials: WY
authors.lastname: Almawi
authors.forename: T
authors.initials: T
authors.lastname: Mahjoub
mesh_terms: D000808:Angiotensinogen / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D002537:Intracranial Arteriosclerosis / Q000150:complications / Q000235:genetics*; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D012083:Renin / Q000235:genetics*; D012084:Renin-Angiotensin System / Q000235:genetics; D012307:Risk Factors; D020521:Stroke / Q000209:etiology / Q000235:genetics*; D014416:Tunisia
chemical_list: D000808:Angiotensinogen; D012083:Renin