© 1996 American Heart Association, Inc.
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Deletion Polymorphism in the Angiotensin-Converting Enzyme Gene in Patients With a History of Ischemic Stroke
From Clinica Medica, Istituto di Medicina Interna e Malattie Dismetaboliche, Universita' di Napoli, and Unita' di Trombosi e Aterosclerosi, IRCCS "Casa Sollievo della Sofferenza," S Giovanni Rotondo, Italy.
Abstract We evaluated the genotypes of the angiotensin-converting enzyme (ACE) gene in 101 subjects with and 109 subjects without a history of ischemic stroke. All were attending a metabolic ward. The two groups were compared for major risk factors for ischemic events. Genotypes were determined by polymerase chain reaction with oligonucleotide primers flanking the polymorphic region in intron 16 of the ACE gene. Deletion polymorphism of the ACE gene (DD genotype) was shown to be more common in subjects with a history of stroke than in those without (relative risk, 1.76; confidence intervals, 1.02 to 3.05). A positive family history for ischemic complications of atherosclerosis was also more common in subjects with documented events (relative risk, 1.99; confidence intervals, 1.10 to 3.59). DD genotype and a positive family history were strong independent discriminators of cerebral ischemia. Plasma levels of tissue-type plasminogen activator (TPA) and plasminogen activator inhibitor-1 help identify subjects with a history of cerebral ischemic episodes. When such fibrinolytic variables were included in the analysis, the DD genotype still strongly and independently discriminated subjects with a stroke history and significantly interacted with TPA levels >10 ng/mL in such identification. We conclude that in subjects attending a metabolic ward, homozygosity for a deletion polymorphism of the ACE gene consistently discriminates subjects with a stroke history. Interaction with TPA improves such identification.
Key Words: ACE genotype • risk factor interaction • family history • fibrinolytic variables
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