Genetic Risk Factors for Thrombosis in Systemic Lupus Erythematosus
The Journal of Rheumatology, 06/20/2012
Kaiser R et al. – The results implicate specific genetic risk factors for thrombosis in patients with systemic lupus erythematosus (SLE) and suggest that genetic risk for thrombosis differs across ethnic groups.Methods
- The discovery cohort consisted of 1698 patients with SLE enrolled in the University of California, San Francisco, Lupus Genetics Project and the replication cohort included 1361 patients with SLE enrolled in the PROFILE cohort.
- Patients fulfilled American College of Rheumatology SLE criteria, and data relevant to thrombosis were available.
- Thirty–three single nucleotide polymorphisms (SNP) previously shown to be associated with risk of deep venous thrombosis in the general population or implicated in thrombosis pathways were genotyped and tested for association with thrombosis in bivariate allelic analyses.
- SNP with p < 0.1 in the bivariate analyses were further tested in multivariable logistic regression models adjusted for age, sex, disease duration, antiphospholipid antibody status, smoking, nephritis, and medications.
- In the discovery cohort, 23% of patients with SLE experienced a thrombotic event.
- SNP in the following genes demonstrated association with thrombosis risk overall in the discovery or replication cohorts and were assessed using metaanalytic methods: factor V Leiden (FVL) rs6025 (OR 1.85, p = 0.02) and methylenetetrahydrofolate reductase (MTHFR) rs1801133 (OR 0.75, p = 0.04) in whites, and fibrinogen gamma (FGG) rs2066865 (OR 1.91, p = 0.01) in Hispanic Americans.
- SNP in these genes showed association with venous thrombosis risk in whites: MTHFR rs1801131 (OR 1.51, p = 0.01), MTHFR rs1801133 (OR 0.70, p = 0.04), FVL rs6025 (OR 2.69, p = 0.002), and FGG rs2066865 (OR 1.49, p = 0.02) in whites.
- A SNP in FGG rs2066865 (OR 2.19, p = 0.003) demonstrated association with arterial thrombosis risk in Hispanics.