Identification of quantitative trait loci for fibrin clot phenotypes: the EuroCLOT study

Frances M K Williams, Angela M Carter, Bernet Kato, Mario Falchi, Lise Bathum, Gabriela Surdulescu, Kirsten Ohm Kyvik, Aarno Palotie, Tim D Spector, Peter J Grant, EuroCLOT Investigators

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


OBJECTIVE: Fibrin makes up the structural basis of an occlusive arterial thrombus, and variability in fibrin phenotype relates to cardiovascular risk. The aims of the current study from the EU consortium EuroCLOT were to (1) determine the heritability of fibrin phenotypes and (2) identify QTLs associated with fibrin phenotypes.

METHODS AND RESULTS: 447 dizygotic (DZ) and 460 monozygotic (MZ) pairs of healthy UK white female twins and 199 DZ twin pairs from Denmark were studied. D-dimer, an indicator of fibrin turnover, was measured by ELISA and measures of clot formation, morphology, and lysis were determined by turbidimetric assays. Heritability estimates and genome-wide linkage analysis were performed. Estimates of heritability for d-dimer and turbidometric variables were in the range 17% to 46%, with highest levels for maximal absorbance which provides an estimate of clot density. Genome-wide linkage analysis revealed 6 significant regions with LOD >3 on 5 chromosomes (5, 6, 9, 16, and 17).

CONCLUSIONS: The results indicate a significant genetic contribution to variability in fibrin phenotypes and highlight regions in the human genome which warrant further investigation in relation to ischemic cardiovascular disorders and their therapy.

Original languageEnglish
Pages (from-to)600-5
Number of pages6
JournalArteriosclerosis, Thrombosis, and Vascular Biology
Issue number4
Publication statusPublished - Apr 2009


  • Adult
  • Blood Coagulation
  • Cardiovascular Diseases
  • Denmark
  • Female
  • Fibrin Fibrinogen Degradation Products
  • Genetic Predisposition to Disease
  • Genome-Wide Association Study
  • Great Britain
  • Humans
  • Linkage Disequilibrium
  • Middle Aged
  • Phenotype
  • Quantitative Trait Loci
  • Quantitative Trait, Heritable
  • Registries
  • Thrombosis
  • Twins, Dizygotic
  • Twins, Monozygotic


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