A quantitative-trait locus in the human factor XII gene influences both plasma factor XII levels and susceptibility to thrombotic disease

José Manuel Soria, Laura Almasy, Juan Carlos Souto, Delphine Bacq, Alfonso Buil, Alexandra Faure, Elisabeth Martínez-Marchán, José Mateo, Montserrat Borrell, William Stone, Mark Lathrop, Jordi Fontcuberta, John Blangero

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

One approach to the identification of genetic loci that influence complex diseases is through the study of quantitative risk factors correlated with disease susceptibility. Factor XII (FXII) plasma levels, a related phenotype correlated with thrombosis, is such a risk factor. We conducted the first genomewide linkage screen to localize genes that influence variation in FXII levels. Two loci were detected: one on chromosome 5 and another on chromosome 10 (LOD scores 4.73 and 3.53, respectively). On chromosome 5, the peak LOD score occurred in the 5q33-5ter region, near the FXII gene. Addition of a 46C/T mutation in the FXII gene increased the multipoint LOD score to 10.21 (P = 3.6 × 10-12). A bivariate linkage analysis of FXII activity and thrombosis further improved the linkage signal (LOD = 11.73) and provided strong evidence that this quantitative-trait locus (QTL) has a pleiotropic effect on the risk of thrombosis (P =. 004). Linkage analysis conditional on 46C/T indicated that this mutation alone cannot explain the chromosome 5 signal, implying that other functional sites must exist. These results represent the first direct genetic evidence that a QTL in or near the FXII gene influences both FXII activity and susceptibility to thrombosis and suggest the presence of one or more still unknown functional variants in FXII.

Original languageEnglish (US)
Pages (from-to)567-574
Number of pages8
JournalAmerican Journal of Human Genetics
Volume70
Issue number3
DOIs
StatePublished - Mar 2002
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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