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Twin Studies of Coronary Heart Disease and Its Risk Factors

Published online by Cambridge University Press:  01 August 2014

Kåre Berg
Kåre Berg*
Affiliation:
Institute of Medical Genetics, University of Oslo, and Department of Medical Genetics, City of Oslo, Norway
*
Institute of Medical Genetics, P.O. Box 1036, Blindern, Oslo 3, Norway

Abstract

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Traditional twin studies have resulted in higher concordance rates for premature coronary heart disease (CHD) in MZ than in DZ twin pairs. This is in agreement with strong evidence from several other studies, that genetic factors are of importance in the etiology of early onset CHD. Also, in a study of 291 Norwegian twin pairs the concordance rate for hypertension wa 0.36 in MZ and 0.08 in DZ pairs. Relationship between diseases and traditional gene markers have been extensively studied and several associations have been uncovered for CHD. Our group has developed a method to examine a possible permissive or restrictive effect of single genes on the degree of variation that environmental and/or life style factors can cause in a given parameter. This method for studying gene-environment interaction is based on the fact that MZ twins are identical with respect to genes, so that any difference between the two members of an MZ pair must necessarily be caused by environmental or life style factors. The possibility that a given gene influences the degree of variability in a parameter such as cholesterol is examined by comparing the within-pair difference in cholesterol level between MZ pairs possessing, and MZ pairs lacking the gene in question, and results of such studies will be presented. New possibilities to study restriction fragment length polymorphisms (RFLPs) at apolipoprotein loci have added a new dimension to research on genetics of CHD and hyperlipidemias. Association between apolipoprotein B, cholesterol and fasting triglyceride levels on one hand and DNA variation at the apolipoprotein B locus on the other has been found. We have studied RFLPs at apolipoprotein loci in twin families. The results are presented.

Keywords

Coronary heart diseaseHypertensionCholesterolApolipoproteinsHyperlipidemias
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 36 , Issue 4 , October 1987 , pp. 439 - 453
Copyright
Copyright © The International Society for Twin Studies 1987

References

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