(Hypertension. 1996;27:62-66.)
© 1996 American Heart Association, Inc.
Articles |
Racial Difference in the Relationship of an Angiotensin I–Converting Enzyme Gene Polymorphism to Serum Angiotensin I– Converting Enzyme Activity
From the Department of Medicine, Indiana University School of Medicine, and the VA Hospital, Indianapolis.
Correspondence to J. Howard Pratt, MD, Department of Medicine, Indiana University School of Medicine, 541 Clinical Dr, Indianapolis, IN 46202. E-mail howardp@medicine.dmed.iupui.edu.
Abstract An insertion (I)/deletion (D) polymorphism of the angiotensin I–converting enzyme (ACE) gene that has been associated with certain cardiovascular disorders accounts for nearly half the variation in serum ACE level in white subjects. Whether a similar association of serum ACE with the I/D polymorphism occurs in other racial groups is not known. We studied the I/D polymorphism of ACE in relation to serum ACE activity in 141 white and 62 black healthy, unrelated children and adolescents (mean age, 14.7 years). The mean level of ACE activity in whites homozygous for the D allele was higher than in heterozygotes (P=.002) and in homozygotes for the I allele (P=.0001), consistent with an earlier study. In blacks, on the other hand, no significant difference in serum ACE activity between genotypes was observed. An additional finding was a significantly positive relationship between serum ACE activity and diastolic pressure (P=.009). In children and adolescents, serum ACE activity is related to the ACE gene I/D polymorphism in whites but not in blacks. The results indicate a potentially important ethnic variation in genetic regulation of serum ACE activity and the relationship of the I/D polymorphism to cardiovascular disease.
Key Words: angiotensin-converting enzyme • genes • blood pressure • blacks
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