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pubmed-article:9184408pubmed:abstractTextElevated plasma levels of lipoprotein(a) [Lp(a)] represent a significant independent risk factor for the development of atherosclerosis. Interindividual levels of apo(a) vary over 1000-fold and are mainly due to inheritance that is linked to the locus of the apolipoprotein(a) [apo(a)] gene. The apo(a) gene encodes multiple repeats of a sequence exhibiting up to 85% DNA sequence homology with plasminogen kringle IV (K.IV), a lysine binding domain. In our search for sequence polymorphisms in the K.IV coding domain, we identified a polymorphism predicting a Thr-->Pro substitution located at amino acid position 12 of kringle IV type 8 of apo(a). The functional and clinical significance of this polymorphism was analysed in a case-control study and by comparing the in vitro lysine binding characteristics of the two Lp(a) subtypes. The case-control study (involving 153 subjects having symptomatic atherosclerosis and 153 age and gender matched normolipidemic controls) revealed a overall allele frequency for the Thr12-->Pro substitution in kringle IV type 8 of 14% and a negative association between presence of the Pro12-subtype and symptomatic atherosclerosis (p < 0.03). The in vitro lysine binding studies, using Lp(a) isolated from subjects homozygous for either Thr12 or Pro12 in K.IV type 8, revealed comparable lysine-Sepharose binding fractions for the two subtypes. The binding affinity (Kd) for immobilised plasmin degraded des-AA-fibrin (Desafib-X) was also comparable for the two subtypes, however a decreased maximal attainable binding (Bmax) for immobilised desafib-X was observed for the Pro12-subtype Lp(a).lld:pubmed
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pubmed-article:9184408pubmed:dateRevised2004-11-17lld:pubmed
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pubmed-article:9184408pubmed:articleTitleThe identification and significance of a Thr-->Pro polymorphism in kringle IV type 8 of apolipoprotein(a).lld:pubmed
pubmed-article:9184408pubmed:affiliationDepartment of Clinical Chemistry, University Hospital Utrecht, The Netherlands. j.prins@lab.azu.nllld:pubmed
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