(Hypertension. 1999;34:1186.)
© 1999 American Heart Association, Inc.
Scientific Contributions |
Association and Linkage Analyses of Glucocorticoid Receptor Gene Markers in Essential Hypertension
From the Hypertension Gene Laboratory, Department of Physiology and Institute for Biomedical Research, The University of Sydney, New South Wales, Australia.
Correspondence to Brian J. Morris, DSc, Hypertension Gene Laboratory, Department of Physiology and Institute for Biomedical Research, Building F13, The University of Sydney, NSW 2006, Australia. E-mail brianm{at}physiol.usyd.edu.au
Abstract—Suggestive evidence has been obtained in a "4-corners" study for involvement of the glucocorticoid receptor gene (GRL) in genetic variation in blood pressure. Therefore, we tested markers at the GRL locus for association and linkage with essential hypertension (HT). For the association study, we used a well-characterized group of 129 white Australians of Anglo-Celtic extraction who had HT, a strong family history of HT (2 parents with the disease), and early-onset moderate-to-severe disease. Controls were 195 normotensive white subjects whose parents were normotensive past the age of 50 years. For the linkage study, we used 175 sibling pairs of similar ancestry. The case-control groups were genotyped for an Asn363Ser variant in exon 2, a G/T variant in intron 4, and a microsatellite marker (D5S207) tightly linked (<200 kb) to GRL. For the groups as a whole, no association or linkage was observed after analysis of data by a variety of statistical tests. Analysis of sibling-pair data gave an exclusion score of -3.8 for the logarithm of the odds for linkage, indicating significant nonlinkage. However, in females, weak association of the intron 4 polymorphism with HT (P=0.03), as well as with systolic and diastolic blood pressure in all subjects (P=0.04 and 0.03), was observed, and in the case of the D5S207 marker, association with HT was apparent in males (P=0.0001). Thus, although our results provide no overall support for GRL in HT etiology, apparent gender-specific associations could exist in this genomic region, possibly reflecting correlated occurrence with (an)other metabolic syndrome disorder(s).
Key Words: glucocorticoids • genes • cross-sectional studies • whites • hypertension, essential • microsatellites
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