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Twin studies in the analysis of minor physiological differences between individuals
Andreas Busjahn1, Freidrich C Luft
1Franz Volhard Clinic, HELIOS Klinikum Berlin, Medical Faculty of the Charité, Humboldt University of Berlin HealthTwiSt GmbH, Berlin. luft@fvk-berlin.de
Summary
The serum and glucocorticoid regulated kinase (SGK1) gene is linked to blood pressure regulation. Genetic variations in SGK1 influence both systolic and diastolic blood pressure in humans.
Area of Science:
- Human Genetics
- Cardiovascular Physiology
Background:
- Blood pressure regulation is complex, involving genetic and environmental factors.
- The serum and glucocorticoid regulated kinase (SGK1) gene is a potential candidate involved in blood pressure control.
Purpose of the Study:
- To investigate the genetic relevance of the SGK1 gene to blood pressure in humans.
- To identify quantitative trait loci (QTL) for blood pressure and assess gene-environment interactions.
Main Methods:
- Recruitment of monozygotic (MZ) and dizygotic (DZ) twin pairs and parents of DZ twins.
- Controlled blood pressure measurements in recumbent, sitting, and upright positions.
- Microsatellite markers and single nucleotide polymorphisms (SNPs) within the SGK1 gene were analyzed for linkage and association.
Main Results:
- Significant linkage of the SGK1 gene locus to diastolic blood pressure (p<0.0002) and suggestive linkage to systolic blood pressure (p<0.04).
- Significant associations between SGK1 gene SNPs and blood pressure, with an interaction effect enhancing the influence.
- Confirmation of the combined SNP effect in an independent sample of 260 young normotensive men.
Conclusions:
- The SGK1 gene plays a significant role in blood pressure regulation in humans.
- SGK1 gene variations are likely relevant to the development of hypertension.