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ORIGINAL ARTICLE
Year : 2005  |  Volume : 6  |  Issue : 1  |  Page : 24-30

A common genetic factor underlies hypertension and other cardiovascular disorders


1 Twin Research and Genetic Epidemiology Unit, St Thomas' Hospital, London, United Kingdom
2 Twin Research and Genetic Epidemiology Unit, St Thomas' Hospital, London; Department of Medicine, University of East Anglia, Norwich, United Kingdom

Correspondence Address:
Frances MK Williams
Twin Research and Genetic Epidemiology Unit, St Thomas. Hospital, London SE1 7EH
United Kingdom
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Source of Support: None, Conflict of Interest: None


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Background: Certain conditions characterized by blood vessel occlusion or vascular spasm, have been found to cluster together in epidemiological studies. However, the biological causes for these associations remain controversial. This study used a classical twin design to examine whether these conditions are linked through shared environmental exposures or by a common underlying genetic propensity to vasospasm. Methods: We investigated the association between hypertension, migraine, Raynaud's phenomenon and coronary artery disease in twins from a national register. Phenotype status was determined using a questionnaire and the genetic and environmental association between phenotypes was estimated through variance components analysis. Results: Responses were obtained from 2,204 individuals comprising 525 monozygotic and 577 dizygotic pairs. There was a significant genetic contribution to all four traits with heritability ranging from 0.34 to 0.64. Multivariate model fitting demonstrated that a single common genetic factor underlies the four conditions. Conclusions: We have confirmed an association between hypertension, migraine, Raynaud's phenomenon and coronary artery disease, and shown that a single genetic factor underlies them. The demonstration of a shared genetic factor explains the association between them and adds weight to the theory of an inherited predisposition to vasospasm.


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