Glucocorticoid receptor-9beta polymorphism is associated with systolic blood pressure and heart growth during early childhood. The Generation R Study

Background: Glucocorticoid receptor-9 beta polymorphism (rs6198) is associated with the susceptibility for cardiovascular disease. Aim: To examine whether the GR-9 beta variant is also associated with blood pressure and heart growth in early childhood. Study design: This study was embedded in a population-based prospective cohort study from fetal life onwards. Analyses were based on 857 children. Outcome measures: Left cardiac structures (aortic root diameter, left atrial diameter and left ventricular mass), shortening fraction and heart beat were measured postnatally at the ages of 1.5, 6 and 24 months. Blood pressure was measured at 24 months of age. Results: The distribution of the GR-9 beta genotype showed 75.1% homozygous reference, 23.5% heterozygous and 1.4% homozygous variant subjects. No differences in cardiovascular outcomes were observed at the ages of 1.5 and 6 months. At the age of 24 months, homozygous variants showed an increased systolic blood pressure of 2.65 mm Hg (95% Cl: 0.16, 5.14), an increased heart rate of 9.10 beats per minute (95% Cl: 1.28, 16.7) and an increased left ventricular mass of 4.99g (95% Cl: 1.33, 8.65) compared to homozygous references. This means an increase of 2.6%, 8.6% and 16%, respectively. GR-9 beta polymorphism was significantly associated with left ventricular mass growth during the first 2 years. Conclusion: Our findings suggest that genetically determined differences in cortisol exposure affect cardiovascular development in early life. (C) 2010 Elsevier Ireland Ltd. All rights reserved.