C-reactive protein (CRP) polymorphisms and haplotypes are associated with SLE susceptibility and activity but not with serum CRP levels in Mexican population

To evaluate the association of C-reactive protein (CRP) polymorphisms with risk of development SLE in a group of Mexican individuals. Five CRP polymorphisms (rs3093059, rs3093062, rs1800947, rs1130864, and rs1205) were determined by PCR-restriction fragment length polymorphism and SNP rs3093061 by refractory mutation system PCR assay in 126 SLE patients and 131 controls. Four of the polymorphisms showed differences between patients and controls. rs3093061 polymorphism was associated with a lower risk of developing lupus principally in the codominant 2 (OR = 0.219, 95% CI 0.108–0.785, P = 0.015) model. rs1130864 was associated with decreased risk mainly under codominant 1 (OR = 0.288, 95% CI 0.143–0.581, P = 0.001) model. rs1205 was associated under the over-dominant model (OR = 0.504, 95% CI 0.270–0.942, P = 0.032). The rs3091244 polymorphism was associated with decreased risk of SLE mostly under additive (OR = 0.605, 95% CI 0.393–0.931. P = 0.022) model. Our study establishes that rs3093061, rs1130864, rs1205, and rs3091244 polymorphisms are associated with decreased risk of developing SLE.