title: Lack of an association between the angiotensin-converting enzyme insertion/deletion polymorphism and intracranial aneurysms in a Caucasian population in the United States.
abstract: OBJECTIVE
  The identification of polymorphisms associated with an increase in the risk of developing disease is integral to the development of genetic biomarkers to identify individuals at risk. Based on reports indicating a role for angiotensin-converting enzyme (ACE) in the pathogenesis of intracranial aneurysms (IAs) as well as hypertension, an independent risk factor for IAs, the authors investigated the association between an insertion/deletion (I/D) polymorphism in the ACE gene and IAs in a Caucasian population in the US.
  
  
  METHODS
  The patient population consisted of 162 randomly selected Caucasian patients who underwent surgical repair of an IA at Memorial-Hermann Hospital (Houston, TX) and had no family history of the disease. The ACE I/D polymorphism was typed using polymerase chain reaction amplification of genomic DNA, and allele and genotype frequencies were compared between the patients with IAs and 143 healthy Caucasian volunteers (control group) by performing logistic regression and chi-square tests. The ACE I/D allele frequencies did not differ significantly between the patient and control populations. There were similar allele and genotype frequencies in male and female study participants in both patient and control populations. The authors found no evidence of an association between the allelic or genotypic distribution of the ACE I/D polymorphism and aneurysmal subarachnoid hemorrhage or unruptured IAs.
  
  
  CONCLUSIONS
  Contrary to findings in two European Caucasian populations (one British and one Polish), this polymorphism did not contribute to the risk of developing IAs in a Caucasian population in the US.
authors.affiliation: Department of Internal Medicine and Neurosurgery, The University of Texas Medical School at Houston, Texas, USA.
authors.forename: Hariyadarshi
authors.initials: H
authors.lastname: Pannu
authors.forename: Dong H
authors.initials: DH
authors.lastname: Kim
authors.forename: C Robyn
authors.initials: CR
authors.lastname: Seaman
authors.forename: Grace
authors.initials: G
authors.lastname: Van Ginhoven
authors.forename: Sanjay
authors.initials: S
authors.lastname: Shete
authors.forename: Dianna M
authors.initials: DM
authors.lastname: Milewicz
mesh_terms: D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency / Q000235:genetics; D005838:Genotype; D006801:Humans; D002532:Intracranial Aneurysm / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D007703:Peptidyl-Dipeptidase A / Q000235:genetics*; D011110:Polymorphism, Genetic / Q000235:genetics*; D014481:United States; D044465:White People / Q000235:genetics*
chemical_list: D007703:Peptidyl-Dipeptidase A