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An amino acid polymorphism in histidine-rich glycoprotein (HRG) explains 59% of the variance in plasma HRG levels

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Author: Hennis, B.C. · Boomsma, D.I. · Boheemen, P.A. van · Engesser, L. · Kievit, P. · Dooijewaard, G. · Kluft, C.
Type:article
Date:1995
Institution: TNO Preventie en Gezondheid
Source:Thrombosis and Haemostasis, 6, 74, 1497-1500
Identifier: 233073
Keywords: Biology · glycoprotein · histidine · adult · age · article · blood level · controlled study · environmental factor · genetic polymorphism · human · inheritance · major clinical study · maximum likelihood method · normal human · pedigree · priority journal · Alleles · Amino Acids · Analysis of Variance · Blood Proteins · Case-Control Studies · Chromosome Mapping · Glycoproteins · Humans · Likelihood Functions · Molecular Weight · Pedigree · Phenotype · Polymorphism, Genetic · Proteins

Abstract

A pedigree-based maximum likelihood method developed by Lange et al. (12) was used to study the contribution of a newly defined di-allelic polymorphism in histidine-rich glycoprotein (HRG) to the plasma levels of HRG. In four families (n = 99) and 20 volunteers we found a heritability of 70%, an age effect of 3% and an effect of individual environmental factors of 27%. These results are remarkably similar to the results found in a previous parent-twin study in which a heritability of 69% and an effect of random environment of 31% was found. The overall genetic influence in the present study can be subdivided into an effect of 59% by the HRG phenotype and 11% by residual genetic factors. The influence of the HRG phenotype of 59% can entirely be explained by adding up the effect of the two alleles that make up the phenotype. These results indicate a codominant inheritance pattern of HRG levels in which the genetic influence can almost completely be ascribed to the additive effect of the di-allelic HRG locus whereas only a small part is due to other loci.